Research Sammy Verbruggen

Abstract

The reverse water-gas shift rWGS reaction can effectively convert CO2 into CO, a crucial building block for the chemical industry. While this endothermic reaction is typically performed at high temperatures, photocatalysis is presented as a low-temperature alternative. PICaSSo will focus on plasmon catalysis: Through localized surface plasma resonance (LSPR), a collective oscillation of conduction electrons at the surface of metal nanoparticles (NP), can increase yield and improve local control of chemical reactions. NPs with LSPR can give rise to three beneficial effects: Near-field reinforcement, excitation of load carriers and local heat generation. To date, it is not known which of these are decisive, to what extent they contribute, and how the composition of the catalyst and nanotechnology can lead to a more effective rWGS reaction. Our goal is to identify the decisive contribution to plasmon-induced catalytic rWGS reaction by specially designed plasmonic POIs and then quantify them via a unique reactor with integrated sensors that measure reaction temperature locally. The scientific findings thus obtained will lead to design rules to develop new generations of catalysts with improved performance, increased durability, and cost-effectiveness by using more widely available metals and optimized plastic metal carrier interactions.

Researcher(s)

• Promoter: Verbruggen Sammy
• Co-promoter: Cool Pegie

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project type(s)

• Research Project

Abstract

DELIGHT aims at excellence of Europe in nanoscience and impact in research and development at the highest level. The project focuses on multifunctional nanomaterials based on colloidal particles, organic/inorganic perovskites, and organic and biomaterials. Design and fabrication of these materials for state-of-the-art applications requires a high level of interdisciplinarity with expertise from chemistry, physics, material science, engineering, nanofabrication and biology, combined with the most advanced spectroscopy tools. The scientific objectives of DELIGHT are to establish a platform of highly versatile functional nanomaterials, with the use of machine learning and artificial intelligence for material/device development and characterization. The focus is on multifunctional hybrids, heterostructures, and assemblies, and to fully exploit their potential for catalysis, energy, lighting, plasmonics, and theranostics. The research is organized in 3 work packages (WPs) that target nanomaterial development, functional composites and in-depth characterization, and device applications. Social and training objectives are the education of young researchers in Europe on the highest level, with emphasis on interdisciplinarity that is fundamental in modern nanoscience, the advancement of technological know-how that enables a sustainable and eco-friendly modern society, and promotion of gender equality in the scientific landscape at all levels. These goals are implemented in a WP dedicated to training, organizing lectures, workshops, technology transfer, and outreach and dissemination events. DELIGHT assembled an academic team of outstanding excellence, which links key players in the EU working on state-of-the-art nanomaterials with world leading universities in the US, Canada, and Argentina that are known for their unique scientific and technological capabilities and efficient technology transfer.

Researcher(s)

• Promoter: Bals Sara
• Co-promoter: Covaci Lucian
• Co-promoter: Milosevic Milorad
• Co-promoter: Van Aert Sandra
• Co-promoter: Verbruggen Sammy

Research team(s)

• Electron microscopy for materials research (EMAT)

Project type(s)

• Research Project

Abstract

Direct decomposition is an excellent approach to reduce NOx exhaust gases, decreasing emissions in industry and providing a positive impact on climate change abatement. Nitrous oxide (N2O), also known as laughing gas, is characterized by a Global Warming Potential (GWP) 273 times that of CO2 over a 100 year's period, which clearly illustrates its impact on climate change. Moreover, problems such as premature death and financial impact on society clearly indicate the need for a reduction in its emissions. Using direct decomposition, the use of additional chemicals such as urea or ammonia is avoided during the decomposition of NOx to N2 and oxygen. Direct decomposition is an excellent option to achieve the abatement of NOx, but the following challenges should be solved before the catalysts are interesting for industrial settings: avoiding by-products, a low (hydro)thermal stability and poisoning by other gas components. Consequently, this project focuses on the development of innovative catalysts through an iterative synthesis-properties-performance development.

Researcher(s)

• Promoter: Cool Pegie
• Co-promoter: Meynen Vera
• Co-promoter: Verbruggen Sammy

Research team(s)

• Laboratory of adsorption and catalysis (LADCA)

Project type(s)

• Research Project

Abstract

Conventional electrolyzers for green hydrogen production comprise membranes or dividers that add to the overall complexity, cost, and maintenance of such systems. In addition, they impose stringent water purity requirements, while fresh water is (becoming a) scarce resource. As a solution, I propose an alternative reactor design that is simpler, robust and more cost-effective. Specifically, in this project I will study a membraneless photo-electrolyzer that produces hydrogen gas from (sea)water, solar light and/or renewable electricity sources. This new cell design is based on flow-mediated separation of the hydrogen and oxygen gas evolving from the photo-electrodes. This concept has recently been patented by the applicant. First advances will be made at the level of the photo-electrodes, by applying nanostructuring of the surface to decrease the bubble size, which in turn will favor gas separation and product purity (set at 99.5%). Secondly, for efficient photo-electrolysis, new optical enhancement mechanisms will be studied to push the solar-to-hydrogen efficiency towards the 10% target. Finally, to exploit the robustness of the cell design, the aim is to demonstrate the cell operation for both electrolysis and photo-electrolysis of sea-water through careful understanding of the crucial process parameters (e.g. pH).

Researcher(s)

• Promoter: Verbruggen Sammy
• Co-promoter: De Wael Karolien
• Fellow: Borah Rituraj

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project type(s)

• Research Project

Abstract

Dengue virus is one of the 10 major threats to global health according to World Health Organization (2019). This (sub)tropical disease is transmitted by mosquitos and has a huge economic and societal impact worldwide. Predictions suggest that 60% of the world population will be at risk of infection by 2080 as a result of urbanization, population growth and rising temperatures. Hence, the availability of an affordable diagnostic tool with excellent analytical performances is essential. Current diagnostics, however, are expensive or lack in sensitivity and specificity. This project aims to develop a technology for RNA virus detection that is fast and cost-effective and has an outstanding specificity and sensitivity. Moreover, it will allow point-of-care testing, enabling its usage as an early warning system for potential outbreaks. To achieve this goal, photo-electrochemistry, in which the signal is triggered by light, will be combined with plasmonic nanoparticles. In this way the limit of detection will decrease to sub-femtomolar ranges. Finally, the laboratory technology will be validated on clinical serum samples and its performances will be compared to the gold standard reverse transcription–polymerase chain reaction. Although this project is focused on dengue diagnosis, its underlying technology can be extended to detect other pathogens and has therefore the potential to play a key role in pandemic preparedness.

Researcher(s)

• Promoter: De Wael Karolien
• Co-promoter: Verbruggen Sammy
• Fellow: Op de Beeck Hannah

Research team(s)

• Antwerp Electrochemical and Analytical Sciences Lab (A-Sense Lab)

Project type(s)

• Research Project

Abstract

Conventional compartmentalized electrolyzers, which split water into hydrogen and oxygen gas using electricity represent the mainstream technology for generating fully carbon-neutral 'green hydrogen' when powered by renewable energy sources. However, common electrolyzers have notable drawbacks including high fabrication costs, maintenance challenges (especially related to membrane stability), and the necessity of ultrapure aqueous electrolyte feed streams dependent on limited freshwater resources. As an alternative technology tackling these problems, a novel membraneless electrolyzer has been studied in the on-going IOF-POC CREATE project. The constructed lab-scale membraneless electrolyzer cell (patent pending) delivers >99.5% pure hydrogen and oxygen gas, and is constructed using affordable and versatile 3D printing tools. In this IOF-POC DEVELOP project, the goal is to scale up our lab unit of 1 W, up to a 1 kW demonstrator. The project primarily focuses on the design of the 1 kW stack, further efficiency improvement of the system and a performance demonstration over a prolonged period of time. This first 1 kW membraneless electrolyzer prototype will serve as a proof-of-concept for the feasibility to scale up our technology to higher capacities by modular integration. During this project, business development initiatives will also be taken through collaborations with interested industrial partners.

Researcher(s)

• Promoter: Verbruggen Sammy
• Co-promoter: Perreault Patrice

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project type(s)

• Research Project

Abstract

Per- and polyfluoroalkyl substances (PFAS) are a very large class of man-made chemicals that include PFOA, PFOS and GenX chemicals. Since the 1940s, PFAS have been manufactured and used in a variety of industries in Europe and around the globe. PFAS are found in everyday items such as food packaging, non-stick stain repellent, and waterproof products, including clothes and other products used by outdoor enthusiasts. PFAS are also widely used in industrial applications and for firefighting. PFAS can enter the environment during production, or through the wide variety of waste streams where they can end up. As they are persistent in the environment and the human body, safe and ultimate disposal is challenging. Selecting the appropriate method for ultimate disposal of PFAS is further complicated by the volatility of PFAS, their water solubility, environmental mobility and persistence. Large amounts of the hazardous PFOS, or perfluorooctane sulfonic acid, have been detected in the Zwijndrecht area but also at numerous other locations in Flanders. It is therefore crucial that PFAS are destroyed in an efficient way, to provide the chemical industry in Flanders with the appropriate tools to solve these problems. Therefore, the research groups in FF-PFAS have joined forces to improve general understanding of PFAS remediation and provide independent data regarding which techniques and process conditions could breakdown PFAS and could completely mineralize them, thus solving the problem for good.

Researcher(s)

• Promoter: Verbruggen Sammy

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project type(s)

• Research Project

Abstract

Novel electrolyzer technologies that improve cost-efficiency through reductions in electricity and component costs will be needed for delivering hydrogen from renewables at scale. HyLEeP will develop a breakthrough photoelectrolysis device that will (a) reduce the electricity demand of clean hydrogen production; (b) eliminate use of critical raw materials (CRM) in electrodes/electrocatalysts; and (c) couple hydrogen generation to valorization of a biomassderived stream, thus improving technoeconomic performance and circularity. HyLEeP aims to deliver plasmon-enhanced, hybrid photoelectrolysis under alkaline conditions for hydrogen generation. Within this project, the research group DuEL will particularly focus on the synthesis of noblemetal-free plasmonic nanostructures based on ZrN, and explore new types of photoelectrochemical cell design. In close interaction with the EnvEcon research group, a detailed techno-economic assessment will be performed, which will reveal the best opportunities towards valorization. Unique in the setting of the valorization roadmap is that not only cost reductions in device construction or sales volumes of produced hydrogen will be accounted for, but also profits made by up-conversion of bio-waste streams used a the feed, and environmental and related costimpacts by avoiding the use of critical raw materials.

Researcher(s)

• Promoter: Verbruggen Sammy

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project type(s)

• Research Project

Abstract

Industrial activities and road traffic are the main causes of the emission of pollutants such as SO2, NOx, and volatile organic compounds (VOCs). According to the World Health Organization, more than 90% of the world's population lives in places where pollutant concentrations exceed their limits. Devoted to the field of environmental remediation, heterogeneous photocatalysis mediated by semiconductors, such as TiO2, has recently attracted significant interest due to its capacity to efficiently convert solar energy into chemical energy which can photodegrade harmful pollutants. Several research studies achieved promising results related to the degradation of different pollutants emitted by fossil fuels used by road vehicles. Due to the huge surface area of photocatalytic asphalt pavements and its vicinity to the exhaust gases from automobiles, they are quoted as promising surfaces for the reduction of SO2, NOx, hydrocarbons and other VOCs present in the atmosphere, but also to photodegrade soot as the accumulation of cars' fuel combustion in areas with heavy traffic. For TiO2, this only occurs in the presence of Ultraviolet (UV) light from sun irradiation and moisture/O2. However, the sunlight is mostly composed of visible and infrared photons, with only about 3%–5% of the solar spectrum comprising the UV range. In this sense, one of the most important concerns reported in recent literature to obtain improved photocatalytic materials is the doping of TiO2 particles with different materials, such as Ce, Cu, and Fe. To obtain photocatalytic asphalt mixtures, three main techniques can be mentioned for applying the semiconductor materials to the asphalt mixtures: (i) spray coating, (ii) volume incorporation, and (iii) binder modification. Spray coating is most likely the most efficient functionalization technique, as it uses smaller amounts of semiconductor material that are all situated at the surface of the pavement. However, the immobilization of the semiconductor particles over the asphalt mixtures surface is still a major challenge. Binder modification leads to a lower photocatalytic efficiency, but it will provide a better immobilization and also improved rheological properties. A significant concern that should be considered as well in both application methods, is the dispersion of the TiO2 nanoparticles. Otherwise, they may agglomerate and, consequently, decrease the photocatalytic efficiency even further. In conclusion, the main objective of this project is to study the major challenges towards a solar-active photocatalytic asphalt mixture which is both efficient and durable. This includes implementing the latest developments regarding modified TiO2 nanoparticles and studying important aspects as dispersion and immobilization.

Researcher(s)

• Promoter: Vuye Cedric
• Co-promoter: Omranian Seyed Reza
• Co-promoter: Verbruggen Sammy
• Fellow: Abadeen Ali Zain Ul

Research team(s)

• Sustainable Pavements and Asphalt Research (SuPAR)

Project type(s)

• Research Project

Abstract

Optical materials are ubiquitous in present society. From the building blocks of displays and LEDs, to fibre optic communication for ultrafast internet, (plasmonic) nanostructures for photocatalysis, bulk heterojunctions for photovoltaics, probes for imaging, sensing and revealing reaction mechanisms in chemistry and catalysis and various nanostructures for nanophotonics applications. The in-depth knowledge on the nature and dynamics of the surface and bulk properties of these materials, such as the fate of electrons and holes that arise after optical excitation requires dedicated spectroscopic techniques that can reveal both steady-state and time-resolved properties of such materials. Fluorescence spectroscopy is one of the most versatile and sensitive techniques that can provide such information. Modern detectors are able to detect single photons that are emitted at time scales ranging from several picoseconds to seconds, and with energies spanning the entire UV, visible and NIR optical range. The system applied for is a versatile steady-state and time-resolved fluorescence spectrometer, that is highly modular and when combined with the already available infrastructure, provides a unique configuration allowing a wide range of experiments that provide information on a.o. ultrafast processes at picosecond timescales, delayed fluorescence from for example triplet states and with a sensitivity over a very broad wavelength range (200 – 1700nm) and accessibility to both ensemble and single-molecule detection from solutions, powders, nanoparticles, films and devices. The infrastructure will be applied in very different research fields, from photocatalysis to excitonic properties of nanomaterials, and from chemical reaction kinetics to photovoltaic and LED applications, which is also confirmed by the very diverse research topics of the 5 involved research teams.

Researcher(s)

• Promoter: Cambré Sofie
• Co-promoter: Johannessen Christian
• Co-promoter: Meynen Vera
• Co-promoter: Van Doorslaer Sabine
• Co-promoter: Verbruggen Sammy

Research team(s)

• Nanostructured and organic optical and electronic materials (NANOrOPT)

Project type(s)

• Research Project

Abstract

Through femtosecond pulsed laser micromachining a wide variety of materials such as ceramics (e.g. glass), hard metals (e.g. Hastelloy), and polymers can be processed with microscale resolution, offering innovation and beyond state-of-the-art research opportunities. To name a few, the planned research infrastructure would allow to tune the catalytic properties of surfaces, to enhance flow distribution, heat transfer and mass transfer in chemical reactors, to increase detection limit of photoelectrochemical sensors, to facilitate flow chemistry, to tailor-make EPR and TEM measurement cells, and to allow machine learning for hybrid additive manufacturing. Currently, the University of Antwerp lacks the necessary research infrastructure capable of processing such materials and surfaces with microscale precision. Access to femtosecond pulsed laser micromachining would yield enormous impact on ongoing and planned research both for the thirteen involved professors and ten research groups as for industry, essential to conduct research at the highest international level.

Researcher(s)

• Promoter: Breugelmans Tom
• Co-promoter: Bogaerts Annemie
• Co-promoter: Cool Pegie
• Co-promoter: De Wael Karolien
• Co-promoter: Maes Bert
• Co-promoter: Meynen Vera
• Co-promoter: Perreault Patrice
• Co-promoter: Van Doorslaer Sabine
• Co-promoter: Vanlanduit Steve
• Co-promoter: Verbeeck Johan
• Co-promoter: Verbruggen Sammy
• Co-promoter: Verwulgen Stijn
• Co-promoter: Watts Regan

Research team(s)

• Applied Electrochemistry & Catalysis (ELCAT)

Project type(s)

• Research Project

Abstract

The production of alternative fuels, and protection of our living environment are two of the most intensively studied topics. Efficient generation of fossil-free fuels at low cost requires the development of new materials and implementation of novel methodologies. On the other hand, cleaning of hazardous substances from waste gasses and air requires ecofriendly technologies. In this project we will tackle both issues simultaneously, by developing fully functional photoelectrochemical systems that degrade organic pollutants in waste gas on one side of the device (photo anode), while producing hydrogen gas on the other side (cathode). Where the oxygen evolution reaction is often the bottleneck in standard photoelectrochemical water splitting, here this issue is circumvented by using organic pollutants as electron donors, that are more easily oxidized than water. The driving force behind the entire process is direct sunlight. Therefore, firstly more solar-responsive photo anode materials will be prepared. After rigorous characterization and screening of the photo-activity, these catalysts are integrated in a fully functional photoelectrochemical test setup, that will enable to deduce all relevant intrinsic kinetic and mass transfer parameters. The latter are used as the input of a multiphysics computational fluid dynamics (CFD) model that will enable to improve the overall process operation and the photoelectrochemical cell design in a convenient way and at low cost. Eventually, based on the outcome of the CFD study a laboratory scale demonstration unit will be constructed to showcase the application potential of this multi-purpose sunlight-driven technology.

Researcher(s)

• Promoter: Verbruggen Sammy
• Co-promoter: Denys Siegfried
• Fellow: Minja Antony Charles

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project type(s)

• Research Project

Abstract

Titanium-dioxide-based materials (titania) are semiconductors with many versatile applications in chemical catalysis, electrochemical sensing, food industry, energy conversion and many more. A considerable part of these applications rely on the electron-hole formation in titania by the absorption of light in the UV range. However, this restricts many practical applications, since sunlight has a limited UV content. Coloured titania, such as grey and black titania, can be formed via thermal, chemical or sonochemical reduction pathways. Although these materials absorb light in the visible range, there is many conflicting data reported about their activity and involved mechanistic pathways. There is also no consensus on the optimal synthesis routes to enhance specific favorable material characteristics. The large heterogeneity in coloured titania materials and their syntheses used in literature hampers a clear correlation between synthesis, electronic structure and activity. In this concerted action, we aim at a controlled alteration of the reduction conditions of porous titania linked to a direct determination of a variety of properties, such as electron traps, surface-adsorbed and surface-reacted species, bulk defects, band gap, polymorphs and pore sizes, and to activity measurements. For the latter we will test their capacity for photocatalytic reduction of CO2 and their applicability as electrode material in the electrochemical sensing of phenolic compounds in water. With this approach we guarantee that the results of the different experiments can be directly compared and correlated. This will allow determining the key factors governing the relation between synthesis, electronic and geometric structure and activity of coloured titania. This knowledge will be translated in optimal synthesis conditions for the here proposed applications, of importance in sustainable chemistry and development. The project makes use of the unique complementary expertise in the synthesis, experimental and theoretical characterization and application of titanium-dioxide-based materials available at UAntwerp.

Researcher(s)

• Promoter: Van Doorslaer Sabine
• Co-promoter: De Wael Karolien
• Co-promoter: Lamoen Dirk
• Co-promoter: Meynen Vera
• Co-promoter: Verbruggen Sammy

Research team(s)

• Biophysics and Biomedical Physics
• Theory and Spectroscopy of Molecules and Materials (TSM²)

Project type(s)

• Research Project

Abstract

The quantitative detection of volatile organic compounds (VOCs) is an essential but challenging task with a broad range of applications: diagnosing disease via breath analysis, monitoring indoor air quality, checking food freshness, detecting explosives, etc. Because of the shortcomings of current gas sensors, the demand for a new generation of selective and sensitive VOC sensors is pressing. This PhD project targets a new type of spectroscopic sensors that tackle this challenge through the combination of (1) nanoscale engineering of light-matter interactions, (2) the growth of thin porous films with a high VOC adsorption affinity, and (3) a biomimetic method to leverage the combined data from an array of partially selective sensors. These concepts will be brought together for the first time through the close collaboration of researchers at two universities and will be demonstrated in the detection of three harmful VOCs in simulated indoor air.

Researcher(s)

• Promoter: Verbruggen Sammy

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project type(s)

• Research Project

Abstract

This IOF consortium connects chemists, engineers, economic and environmental oriented researchers in an integrated team to maximize impact in key enabling sustainable chemical technologies, materials and reactors that are able to play a crucial role in a sustainable chemistry and economic transition to a circular, resource efficient and carbon neutral economy (part of the 2030 and 2050 goals in which Europe aims to lead). Innovative materials, renewable chemical feedstocks, new/alternative reactors, technologies and production methods are essential and central elements to achieve this goal. Due to their mutual interplay, a multidisciplinary, concerted effort is crucial to be successful. Furthermore, early on prediction and identification of strengths, opportunities, weaknesses and threats in life cycles, techno-economics and sustainability are key to allow sustainability by design and create effective knowledge-based decision-making and focus. The consortium focuses on sustainable chemical production through efficient and alternative energy use connected to circularity, new chemical pathways, technologies, reactors and materials, that allow the use of alternative feedstock and energy supply. These core technical aspects are supported by expertise in simulation, techno-economic and environmental impact assessment and uncertainty identification to accelerate technological development via knowledge-based design and early stage identified key research, needed for accelerated growth and maximum impact on sustainability. To achieve these goals, the consortium members are grouped in 4 interconnected valorisation programs focusing on key performance elements that thrive the chemical industry and technology: 1) renewable building blocks; 2) sustainable materials and materials for sustainable processes; 3) sustainable processes, efficiently using alternative renewable energy sources and/or circular chemical building blocks; 4) innovative reactors for sustainable processes. In addition, cross-cutting integrated enablers are present, providing expertise and essential support to the 4 valorisation programs through simulation, techno-economic and environmental impact assessment and uncertainty analysis.

Researcher(s)

• Promoter: Meynen Vera
• Co-promoter: Billen Pieter
• Co-promoter: Bogaerts Annemie
• Co-promoter: Breugelmans Tom
• Co-promoter: Cool Pegie
• Co-promoter: Das Shoubhik
• Co-promoter: Lenaerts Silvia
• Co-promoter: Maes Bert
• Co-promoter: Neyts Erik
• Co-promoter: Perreault Patrice
• Co-promoter: Vande Velde Christophe
• Co-promoter: Van Passel Steven
• Co-promoter: Verbruggen Sammy
• Fellow: Meyer Nathalie

Research team(s)

• Laboratory of adsorption and catalysis (LADCA)

Project type(s)

• Research Project

Abstract

High resolution Raman imaging is a versatile imaging technique that generates detailed maps of the chemical composition of technical as well as biological samples. The equipment with given specifications is not yet available at UAntwerp, and will crucially complement the high-end chemical imaging techniques (XRF, XRD, IR, SEM-EDX-WDX, LA-ICP-MS) that are already available at UAntwerp for material characterization. High resolution Raman imaging will expose, with high resolution, the final details (structural fingerprint) of the material of interest. In first instance, we aim to boost the following research lines: electrochemistry, photocatalysis, marine microbiology, environmental analysis and cultural heritage. The Raman microscope should be as versatile as possible, to support potential future technological enhancements.

Researcher(s)

• Promoter: De Wael Karolien
• Co-promoter: Caen Joost
• Co-promoter: Cool Pegie
• Co-promoter: Janssens Koen
• Co-promoter: Meysman Filip
• Co-promoter: Verbruggen Sammy

Research team(s)

• Antwerp Electrochemical and Analytical Sciences Lab (A-Sense Lab)

Project type(s)

• Research Project

Abstract

Electron paramagnetic resonance (EPR) offers a unique tool for the characterization of paramagnetic systems found in biological and synthetic materials. It is used in very diverse fields, such as biology, chemistry, physics, medicine and materials sciences. EPR is a global name for many different techniques, of which the pulsed EPR spectroscopies are the most versatile ones, able to reveal very detailed structural information. The University of Antwerp hosts a pulsed and high-field EPR facility that is unique in Belgium. However, the basic continuous-wave EPR instrumentation that underlies this facility needs urgent upgrade. Moreover in recent years, the technical realization of arbitrary waveform generators (AWGs) with clock rates higher than a gigahertz has initiated a new era in EPR spectroscopy. These AWGs allow for novel experiments with shaped pulses through which more detailed information about the systems under study can be obtained. Use of these shaped pulses avails enormously increased sensitivity and spectral width. This is particularly important for the study of nanostructured materials and the detection of transiently formed active sites during catalysis, device operation or biological in-cell reactions, topics of major interest for the consortium. The requested extension of the EPR facility is essential to assure that EPR at UAntwerp remains at the forefront in this rapidly changing field.

Researcher(s)

• Promoter: Van Doorslaer Sabine
• Co-promoter: Breugelmans Tom
• Co-promoter: Cambré Sofie
• Co-promoter: Dewilde Sylvia
• Co-promoter: Maes Bert
• Co-promoter: Meynen Vera
• Co-promoter: Van den bergh Wim
• Co-promoter: Verbruggen Sammy

Research team(s)

• Biophysics and Biomedical Physics
• Theory and Spectroscopy of Molecules and Materials (TSM²)

Project type(s)

• Research Project

Abstract

Nanomaterials play a key role in modern technology and society, because of their unique physical and chemical characteristics. The synthesis of nanomaterials is maturing but surprisingly little is known about the exact roles that different experimental parameters have in tuning their final properties. It is hereby of crucial importance to understand the connection between these properties and the (three-dimensional) structure or composition of nanomaterials. The proposed consortium will focus on the design and use of nanomaterials in fields as diverse as plasmonics, electrosensing, nanomagnetism and in applications such as art conservation, environment and sustainable energy. In all of these studies, the consortium will integrate (3D) quantitative transmission electron microscopy and X-ray spectroscopy with density functional calculations of the structural stability and optoelectronic properties as well as with accelerated molecular dynamics for chemical reactivity. The major challenge will be to link the different time and length scales of the complementary techniques in order to arrive at a complete understanding of the structure-functionality correlation. Through such knowledge, the design of nanostructures with desired functionalities and the incorporation of such structures in actual applications, such as e.g. highly selective sensing and air purification will become feasible. In addition, the techno-economic and environmental performance will be assessed to support the further development of those applications. Since the ultimate aim of this interdisciplinary consortium is to contribute to the societal impact of nanotechnology, the NanoLab will go beyond the study of simplified test materials and will focus on nanostructures for real-life, cost-effective and environmentally-friendly applications.

Researcher(s)

• Promoter: Bals Sara
• Co-promoter: De Wael Karolien
• Co-promoter: Janssens Koen
• Co-promoter: Lenaerts Silvia
• Co-promoter: Milosevic Milorad
• Co-promoter: Neyts Erik
• Co-promoter: Van Aert Sandra
• Co-promoter: Van Passel Steven
• Co-promoter: Verbruggen Sammy

Research team(s)

• Electron microscopy for materials research (EMAT)

Project type(s)

• Research Project

Abstract

This project represents a formal research agreement between UAntwerp (research group on Sustainable Energy, Air & Water Technology, DuEL) and on the other hand the client. UAntwerp provides the client research results mentioned in the title of the project under the conditions as stipulated in this contract.

Researcher(s)

• Promoter: Verbruggen Sammy

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project type(s)

• Research Project

Abstract

Water electrolysis in compartmentalized electrolyzers to split water into hydrogen and oxygen gas, is the most mature technology for producing fully carbon-neutral 'green hydrogen', when powered by green energy sources. The major advantage of this approach over "one-pot" reactions, is that the reaction products are readily available in their pure form. The major disadvantages of common electrolyzers are the costs associated with their fabrication, the maintenance (especially related to the (in)stability of the membrane), and the requirement of well-defined aqueous electrolyte feed streams based on fresh water, which is a scarce resource. In this project, a new type of (photo)electrolyzer is developed that combines the ease and low maintenance of one-pot reactions, with the benefits of continuous operation and product gas separation as offered by compartmentalized electrolyzers, in a new type of membraneless (photo)electrolyzer run in a continuous flow regime. The electrolyzer design facilitates both electro- and photo(electro)chemical water splitting. The project focusses on optimization of the geometrical design of the reactor, the experimental validation of a product purity of at least 95%, and aimed at even surpassing 99%, and a demonstration of the design's compatibility with using solar light as a driving force.

Researcher(s)

• Promoter: Verbruggen Sammy

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project type(s)

• Research Project

Abstract

The ARCLATH-2 project aims to overcome current drawbacks in hydrogen transportation and storage by developing a radically new transportation and storage concept based on clathrates. After a year of research, ARCLATH-1 already provided a proof of concept that shows hydrogen can indeed be encapsulated in clathrates under technically and economically relevant conditions, in terms of both pressure and temperature. A follow-up project ARCLATH-2 has now been initiated to maximise the hydrogen storage capacity of the clathrates under similar pressure and temperature conditions. At the same time, ARCLATH-2 will define a practical process of reversible hydrogen storage and delivery based on pressure swing cycling at lab-scale.

Researcher(s)

• Promoter: Cool Pegie
• Co-promoter: Bals Sara
• Co-promoter: Lenaerts Silvia
• Co-promoter: Perreault Patrice
• Co-promoter: Verbruggen Sammy

Research team(s)

• Laboratory of adsorption and catalysis (LADCA)

Project type(s)

• Research Project

Abstract

This project is being carried out by the University of Antwerp and VITO, and supported by the Belgian Road Research Centre (BRRC). Two possible solutions are being investigated to prevent the release of zinc from rubber granules; on the one hand by coating the rubber granules (UAntwerp) and on the other hand by trapping the released harmful components in a sorbent before they are released into the environment (VITO). Possible solutions can, be developed further at a later stage (phase II) and can be used for many applications of rubber granulates where environmental problems play a role. In the follow-up research, attention will also be paid to the recyclability and durability of both solutions (influence of ageing and/or exceptional weather conditions).

Researcher(s)

• Promoter: Vuye Cedric
• Co-promoter: Billen Pieter
• Co-promoter: Blom Johan
• Co-promoter: Blust Ronny
• Co-promoter: Dardenne Freddy
• Co-promoter: Vande Velde Christophe
• Co-promoter: Verbruggen Sammy

Research team(s)

• Sustainable Pavements and Asphalt Research (SuPAR)

Project type(s)

• Research Project

Abstract

The two biggest challenges of the 21st century are: i) air pollution and global warming, and ii) seeking alternative energy sources. To address both these issues, we plan to combine air-treatment with generation of green energy/chemicals as end products, using solar power. In particular, we will focus on photoelectrocatalytic decomposition of volatile organic compounds (VOCs) and CO2 to produce hydrogen and formic acid respectively. The efficiency of these reactions is limited with conventionally used aqueous phase with TiO2 or noble metal-based electrodes. We propose to overcome these issues by running a gas phase photoelectrocatalytic cell by metal-free, highly porous and electrochemically stable photoelectrodes. In that context, we will explore the possibility of using Covalent Organic Frameworks (COF) as photoelectrodes. Apart from their high surface area and tunable bandgap, the metal-free COFs are cheap and devoid of leaching. However, their low electrical conductivity presents a hurdle. Here, we will focus on enhancing the optical and electrical conductivity of COFs simultaneously by synthesizing highly conjugated COFs and growing them on carbon fibre cloth (CFC) as binder-free COF-CFC hybrid electrodes. Combining the expertise and facilities of COMOC (UGent) and DuEL groups (UAntwerpen), we plan to optimize the photoelectrochemical reactions with COF-based electrodes. Such optimizations will facilitate the future adoption of our work in a larger industrial setting.

Researcher(s)

• Promoter: Lenaerts Silvia
• Co-promoter: Verbruggen Sammy

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project type(s)

• Research Project

Abstract

Methane has recently been under attention as the atmospheric methane concentration is increasing more rapidly than initially expected. As methane is the second largest contributor to the enhanced greenhouse effect, this increases the urge for sustainable methane mitigation strategies in contrast to the current handling of methane emissions (e.g. venting). In this project a sustainable methane mitigation strategy, namely photoelectrochemical (PEC) methane degradation, is presented, which has not been studied before. In a PEC cell both mineralization of methane (at the photo-anode) and hydrogen evolution (at the cathode) are combined in a single device that runs solely on (solar) light as the energy input. First, the PEC cell will be optimized by selecting the best performing photo-anode material using the knowledge attained at the Wuhan University of Technology (China), also studying less conventional materials, nanostructures and synthesis strategies. As methane-rich waste streams are often gas mixtures, the influence of different common chemical compounds will be investigated both on overall cell performance, as well as in-situ. Finally, the effect of different reaction conditions will also be studied, as these factors are known to strongly influence photodriven processes. In summary, this project will allow us to evaluate the promise of PEC-technology for energy-efficient abatement of methane waste, while providing valuable new insight into the reaction mechanisms.

Researcher(s)

• Promoter: Lenaerts Silvia
• Co-promoter: Verbruggen Sammy
• Fellow: Van Hal Myrthe

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project type(s)

• Research Project

Abstract

This project represents a formal research agreement between UAntwerp (research group on Sustainable Energy, Air & Water Technology, DuEL) and on the other hand the client. UAntwerp provides the client research results mentioned in the title of the project under the conditions as stipulated in this contract.

Researcher(s)

• Promoter: Verbruggen Sammy

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project type(s)

• Research Project

Abstract

The goal of this POC project is to evaluate and improve the photocatalytic properties of hygienic wall protection materials. The photocatalytic activity relates to four specific properties: (1) the self-cleaning character ('anti-fouling'), (2) air purifying character, (3) antibacterial properties, and (4) color resistance. In order to test and compare various photocatalytic modification strategies, four (ISO) standardized testing procedures will be installed and benchmark experiments on the existing materials will be performed. Next, three different modification strategies will be applied, of which one is based on an existing patented coating protocol developed at DuEL, and two others are completely novel strategies. The modification is considered successful if it results in a firmly attached coating that does not disrupt the original wall protection material properties. If at least one strategy proves to be promising, the project will be continued in phase 2, during which the modified materials will be characterized in more detail, modified with plasmonic materials and tested after which the valorization campaign will be initiated, driven by the industrial partner's business case. Successful application of the results from this POC project will enable to comply with even stricter safety regulations and introduce the modified products in new market segments related to food, pharmacy and healthcare.

Researcher(s)

• Promoter: Verbruggen Sammy

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project type(s)

• Research Project

Abstract

This project represents a formal research agreement between UAntwerp (research group on Sustainable Energy, Air & Water Technology, DuEL) and on the other hand the client. UAntwerp provides the client research results mentioned in the title of the project under the conditions as stipulated in this contract.

Researcher(s)

• Promoter: Verbruggen Sammy

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project type(s)

• Research Project

Abstract

The aim of this project is to study, explore and develop various (catalytic) technologies for the production of CO as platform chemical via conversion of CO2. A technology assessment will subsequently be carried out to evaluate the potential of each technology, pinpointing promising strategies for further development and upscaling. Concrete objectives and criteria The efficiency/productivity of existing homogeneous catalytic systems for CO2 reduction to CO will be mapped out and evaluated to identify the most promising systems to achieve this reduction and to explore ways to improve its larger scale viability through detailed catalyst modification studies. The focus will be on cobalt and nickel systems containing N-heterocyclic carbene (NHC) species as ligands. The goal of the heterogeneous catalytic conversion of CO2 to CO is to assess the potential of the oxidative propane dehydrogenation (OPD) reaction with CO2 as a soft oxidant. The main purpose here is to focus on and maximize CO2 reduction and CO formation via novel catalyst synthesis, surface engineering and investigation of catalyst support. In the field of electrocatalytic conversion of CO2 to CO we aim to (1) develop metal-based electrodes (electrocatalysts integrated in gas diffusion electrodes) exhibiting enhanced stability, (2) to investigate a novel type of metal-free electrocatalyst that can tackle the current challenges witnessed in N-doped carbons and (3) to demonstrate the continuous production of CO from CO2 by the development of a prototype lab scale reactor including the best-performing electrocatalysts developed in this project Another goal of this project is providing a proof-of-concept for plasmonic enhanced CO2 conversion into CO in an energy-lean process involving only solar light at ambient pressure as energy input i.e. without external heating. The objective of the plasma catalytic route for CO production is to enhance the conversion and energy efficiency of CO2 conversion in different plasma reactor types, with major focus on Gliding Arc plasma and Nanosecond pulsed discharges (NPD) plasma reactors. The project also takes up the challenge to activate CO2 and bio-CH4 and turn them into CO by combining chemical looping processes, into which catalysis is integrated, mediated by multifunctional materials (combine different functionalities into one smartly engineered material) and/or spatial organization of materials in dynamically operated packed-bed reactors.

Researcher(s)

• Promoter: Verbruggen Sammy
• Co-promoter: Cool Pegie
• Co-promoter: Lenaerts Silvia

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project website

Project type(s)

• Research Project

Abstract

In this project a proof-of-concept will be delivered for hydrogen storage in clathrates, an estimation of the application potential and an interdisciplinary research consortium on clathrate research will be established. The feasibility of hydrogen storage in clathrate materials will be studied in technological and economical relevant conditions of temperature and pressure. The central research question is to synthesize and stabilize hydrogen clathrates by catalytic processes in order to develop a new hydrogen storage technology. The concrete aim is to achieve 5 wt% and 30 g/l storage of hydrogen by temperatures above 2C and pressures below 100 bar.

Researcher(s)

• Promoter: Lenaerts Silvia
• Co-promoter: Perreault Patrice
• Co-promoter: Verbruggen Sammy

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project type(s)

• Research Project

Abstract

In 2012 international shipping emitted about 800 Mton CO2, 18.6 Mton NOx and 10.6 Mton SOx. It is expected that by 2050 these emissions will increase by 250% if no actions are taken. Therefore, scientific research for greener fuel alternatives is highly needed, and hydrogen has been identified as a promising candidate in that context. In this project, abundant seawater (rather than scarce pure water) will be split into hydrogen and oxygen gas using TiO2-based photocatalysts. The major drawback of TiO2 is the fact that it is only activated by ultraviolet (UV) light, corresponding to less than 5% of the incident solar spectrum on Earth. As a solution, the photocatalysts will be modified with ordered bimetallic gold-silver nanoparticles that strongly interact with sunlight. To ensure stability on the long term, even in the presence of a saline reaction environment, the plasmonic nanoparticles will be capped by a protective shell using wet-chemical synthesis techniques. The shell also acts as a spacer layer between the plasmonic cores that tunes the resulting interparticle distance and hot-spot formation. All structures will be thoroughly characterized down to the nanoscale, and action spectrum analysis will be performed in collaboration with Hokkaido University. Seawater splitting is only a very recently studied application. The use of plasmonic nanostructures in that regard is unprecedented, meaning the results from this project will move well beyond the state-of-the-art.

Researcher(s)

• Promoter: Verbruggen Sammy
• Co-promoter: Lenaerts Silvia
• Fellow: Dingenen Fons

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project type(s)

• Research Project

Abstract

Soot is considered to be the second-largest contributor to global excess radiative forcing after CO2 and deemed responsible for 7 million premature deaths annually according to WHO. We propose an efficient photocatalyst for soot degradation (with simultaneous NOx reduction), using solar light as energy input. Photocatalytic oxidation is often achieved with TiO2 as photo-active material. The main drawback of TiO2 is its large band gap, which limits the overall solar light response to the UV region of the spectrum. Plasmonic photocatalysis using noble metal nanoparticles (NPs) has emerged as a promising technology to expand the activity window of traditional photocatalysts to the entire UV-visible light region of the solar spectrum. In this project, gold and silver NPs will be merged to overcome their individual limitations and form stable bimetallic NPs with highly tuneable plasmonic properties over a wide wavelength range. These plasmonic NPs will be embedded in TiO2 coatings. The plasmonic enhancement of photocatalytic air purifying and selfcleaning coatings will be studied in the laboratory by FTIR spectroscopy, contact angle measurements, digital imaging analysis and action spectrum analysis, as well as through real-life validation experiments in different cities, that illustrate the relevance of this research to the broader audience and potential investors. The proposed technology will be developed from TRL 2/3 to 5 including a CEA and possible recycling options.

Researcher(s)

• Promoter: Verbruggen Sammy
• Co-promoter: Lenaerts Silvia
• Fellow: Peeters Hannelore

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project type(s)

• Research Project

Abstract

The goal of this project is to develop semi-active photocatalytic systems for mitigating air pollution in urban environments. With semi-active systems is meant photocatalytic systems with (i) improved functionality (enhanced activity under solar light conditions), (ii) in which the transfer of pollutants to the photocatalytic surfaces is increased (by inducing natural or forced convection) and (iii) where the sunlight is optimally utilized by optimizing the received light intensity. The hypothesis is that systems that meet these conditions are superior to so-called passive photocatalytic systems. In this project, a promising plasmon-enhanced photocatalytic material, developed by our research group, will be characterized in terms of its sensitivity to sunlight. The relevant reaction kinetic parameters will hereby be determined and will be used for designing semi-active air purification systems based on computational fluid dynamics (CFD) models, thus limiting the need for extensive experiments. The most promising system will then be built on scale model and will be extensively tested under controlled conditions. Finally, a demonstration model will be built in a realistic environment. The ultimate goal of the IOF-POC project is to demonstrate the feasibility of semi-active photocatalytic systems and thus to awaken the interest of potential industrial partners and other stakeholders.

Researcher(s)

• Promoter: Denys Siegfried
• Co-promoter: Verbruggen Sammy

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project type(s)

• Research Project

Abstract

The goal of this project is to simultaneously address two persistent needs of today's society: sustainable energy production and good air quality. TiO2-based photocatalysis has proven to be successful in both light-driven hydrogen production as well as the degradation of organic pollutants. In this project the intention is to couple both applications in a single device, this way recovering part of the energy stored in the organic molecules as hydrogen gas, while mineralizing the carbon fraction to CO2. This process can be performed in a photoelectrochemical cell. Oxidation of VOCs occurs at the photo-anode, while hydrogen is produced at the cathode on the opposite side of a proton-conducting solid electrolyte membrane. Accurate and in-line detection of hydrogen gas as the desired reaction product is crucial for a thorough understanding of the cell operation. This grant is thus intended for purchasing a gas chromatograph with a state-of-the-art Barrier Ionization Discharge (BID) trace detection system for accurate analysis of hydrogen gas production at the cathode, that will complement existing infrastructure used to analyze photocatalytic VOC degradation at the photo-anode.

Researcher(s)

• Promoter: Verbruggen Sammy

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project type(s)

• Research Project

Abstract

Soot is considered to be the second-largest contributor to global excess radiative forcing after CO2 and deemed responsible for tripling the amount of premature deaths by 2060. We therefore propose a fundamental study to develop an efficient photocatalyst for the degradation of soot deposits, using (solar) light as the energy input. Photocatalytic oxidation is often achieved with TiO2 as the photoactive material. The main drawback of TiO2 is its large band gap, which limits the overall solar light response to the UV region of the spectrum. As a solution, plasmonic photocatalysis using noble metal nanoparticles (NPs) has emerged as a promising technology to expand the activity window of traditional photocatalysts to the entire UV-visible light region of the solar spectrum. In this project gold and silver NPs will be merged to overcome their individual limitations and form stable bimetallic NPs with highly tunable plasmonic properties over a wide wavelength range. These bimetallic NPs will be organized as an ordered plasmonic nanostructure, that will be characterized from bulk to nanoscale, a part of which in collaboration with the Institute for Catalysis at Hokkaido University, Japan. The effect of plasmonic enhancement on the photocatalytic soot degradation mechanism will be studied on a fundamental level by in-situ FTIR spectroscopy, but also through larger scale demonstration experiments that illustrate the relevance of this research to the broader audience.

Researcher(s)

• Promoter: Verbruggen Sammy
• Fellow: Borah Rituraj

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project type(s)

• Research Project

Abstract

Methane has recently been under attention as the atmospheric methane concentration is increasing more rapidly than initially expected. As methane is the second largest contributor to the enhanced greenhouse effect, this increases the urge for sustainable methane mitigation strategies in contrast to the current handling of methane emissions (e.g. venting). In this project a sustainable methane mitigation strategy, namely photoelectrochemical (PEC) methane degradation, is presented, which has not been studied before. In a PEC cell both mineralization of methane (at the photo-anode) and hydrogen evolution (at the cathode) are combined in a single device that runs solely on (solar) light as the energy input. First, the PEC cell will be optimized by selecting the best performing photo-anode material using the knowledge attained at the Wuhan University of Technology (China), also studying less conventional materials, nanostructures and synthesis strategies. As methane-rich waste streams are often gas mixtures, the influence of different common chemical compounds will be investigated both on overall cell performance, as well as in-situ. Finally, the effect of different reaction conditions will also be studied, as these factors are known to strongly influence photodriven processes. In summary, this project will allow us to evaluate the promise of PEC-technology for energy-efficient abatement of methane waste, while providing valuable new insight into the reaction mechanisms.

Researcher(s)

• Promoter: Lenaerts Silvia
• Co-promoter: Verbruggen Sammy
• Fellow: Van Hal Myrthe

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project website

Project type(s)

• Research Project

Abstract

The main objective of the PLASMON-ELECTROLIGHT project is to elaborate an efficient sensing strategy to measure pharmaceuticals. The detection technique will be developed from an original photoelectrochemical detection strategy that is boosted by advanced photosensitizers, plasmonic enhancement, and affinity recognition. The photoactive hybrid materials must be designed carefully through rational choice of photosensitizers and metallic nanostructures, theoretical modeling, and experimental correlations. Next, the materials will be combined with biorecognition elements and employed as photoelectrochemical sensor. Our objectives also include a better understanding of the mechanism for plasmonic enhancement of photosensitizers' activity, developing new photoreactive materials and better methods to tests them. This will contribute to different field of chemical sensing, material science, and energy conversion.

Researcher(s)

• Promoter: De Wael Karolien
• Co-promoter: Lenaerts Silvia
• Co-promoter: Verbruggen Sammy

Research team(s)

Project type(s)

• Research Project

Abstract

This Hercules proposal concerns screen printing facilities. Screen printing facilities enable UAntwerp to pioneer in the field of electronics, sensors and photocatalysis by (1) developing unique (photo)sensors/detectors (e.g. electrochemical sensors, photovoltaics, photocatalysis) by printing (semi)conducting materials on substrates, (2) designing parts of Internet of Things modules with more flexibility and more dynamically, meanwhile creating a unique valorization potential and IP position.

Researcher(s)

• Promoter: De Wael Karolien
• Co-promoter: Caen Joost
• Co-promoter: Cool Pegie
• Co-promoter: Janssens Koen
• Co-promoter: Meysman Filip
• Co-promoter: Samson Roeland
• Co-promoter: Steckel Jan
• Co-promoter: Verbruggen Sammy
• Co-promoter: Weyn Maarten

Research team(s)

Project type(s)

• Research Project

Abstract

Processes in energy applications and catalysis as well as biological processes become increasingly important as society's focus shifts to sustainable resources and technology. A thorough understanding of these processes needs their detailed observation at a nano or atomic scale. Transmission electron microscopy (TEM) is the optimal tool for this, but in its conventional form it requires the study object to be placed in ultrahigh vacuum, which makes most processes impossible. Using environmental TEM holders, the objects can be placed in a gas/vapour or liquid environment within the microscope, enabling the real time imaging, spectroscopic and diffraction analysis of the ongoing processes. This infrastructure will enable different research groups within the University of Antwerp to perform a wide range of novel research experiments involving the knowledge on processes and interactions, including among others the growth and evolution of biological matter, interaction of solids with gasses/vapours or liquid for catalysis, processes occurring upon charging and discharging rechargeable batteries, the nucleation and growth of nanoparticles and the detailed elucidation of intracellular pathways in biological processes relevant for future drug delivery therapies and treatments.

Researcher(s)

• Promoter: Hadermann Joke
• Co-promoter: Bals Sara
• Co-promoter: Breugelmans Tom
• Co-promoter: Meynen Vera
• Co-promoter: Sijbers Jan
• Co-promoter: Verbruggen Sammy

Research team(s)

• Electron microscopy for materials research (EMAT)

Project type(s)

• Research Project

Abstract

The goal of this IOF-POC project is to develop a market viable self-cleaning coating. The self-cleaning effect relies on the concept of photocatalysis; an advanced oxidation technology that enables the degradation of organic pollutants with light as an energy input and a semiconductor (here TiO2) as the catalyst. The main challenge of the project is to significantly increase the light-efficiency of the coating, while keeping the coating as transparent and cost-effective as possible. After optimizing the coating parameters and evaluating its cost-effectiveness, the ultimate target is to develop several prototypes that demonstrate the applicability in the building sector (e.g. skyscraper windows), as solar panel cover plates, or self-cleaning fish tanks.

Researcher(s)

• Promoter: Verbruggen Sammy
• Co-promoter: Lenaerts Silvia

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project type(s)

• Research Project

Abstract

Research Council Award 2017 - Award Verbeure: Applied & Exact Sciences The award will be used for funding the further development and dissemination of the research on plasmonics for improving photocatalysis. Elucidation of the fundamental operating principle, as well as the actual application of the technology, are both key aspects.

Researcher(s)

• Promoter: Verbruggen Sammy

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project type(s)

• Research Project

Abstract

Methane has recently been under attention as the atmospheric methane concentration is increasing more rapidly than initially expected. As methane is the second largest contributor to the enhanced greenhouse effect, this increases the urge for sustainable methane mitigation strategies in contrast to the current handling of methane emissions (e.g. venting). In this project a sustainable methane mitigation strategy, namely photo-electrochemical (PEC) methane degradation, is presented, which has not been studied before. In a PEC cell both mineralization of methane (at the photo-anode) and hydrogen evolution (at the cathode) are combined in a single device that runs solely on (solar) light as the energy input. First, the PEC cell will be optimized by selecting the best performing photo-anode material, also studying less conventional materials, nanostructures and synthesis strategies. As methane-rich waste streams are often gas mixtures, the influence of different common chemical compounds (O2, CO2, NOx, H2O, NH3) will be investigated both on overall cell performance, as well as in-situ. Finally, the effect of different reaction conditions (temperature, flow rate and light intensity) will also be studied, as these factors are known to strongly influence photo-driven processes. In summary, this project will allow us to evaluate the promise of PEC-technology for energy-efficient abatement of methane waste, while providing valuable new insight into the reaction mechanisms.

Researcher(s)

• Promoter: Lenaerts Silvia
• Co-promoter: Verbruggen Sammy
• Fellow: Van Hal Myrthe

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project type(s)

• Research Project

Abstract

Practical applications of liquid solar light-driven photocatalytic reactions are hampered by two main factors: (i) limited (visible) light absorption and (ii) problematic post-separation due to the nano-sized dimensions of the catalysts involved. In this BOF-KP a technological solution is developed to address both problems simultaneously. In a first stage stabilized magnetic nanoclusters will be prepared that can be separated fast and effectively. Secondly, UV-visible light responsive plasmonic nanoparticles/photocatalysts are anchored to these stabilized magnetic nanoclusters. This will reduce operation costs since freely available solar light can be utilized more effectively. Additionally, costs are avoided associated with down-stream catalyst separation. Magnetized plasmonic photocatalysts will be tested toward waste water purification (phenol degradation), whereas pure magnetized plasmonic nanoparticles will be tested as catalysts toward the direct selective photo-conversion of aniline to di-azobenzene. Using plasmonic metal nanoparticles for direct photochemical selective transformations provides an alternative 'green' synthesis process. Traditionally such reactions require elevated temperature or pressure, as well as the addition of stoichiometric quantities of specific chemicals that lead to unwanted waste streams. The method proposed in this BOF-KP only involves free sunlight as the energy source, a nano-catalyst that can be easily recovered, no additional chemicals are required and the entire reaction is carried out at room temperature.

Researcher(s)

• Promoter: Verbruggen Sammy

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project type(s)

• Research Project

Abstract

Air pollution is one of the problems that has attracted specific attention since the start of the 21st century. Volatile organic compounds (VOCs), originating from furniture or building materials amongst others, are an important class of pollutants and the concentration indoors are often several times higher than outdoors. The main goal is the complete mineralization of VOCs based on a photocatalytic oxidation process which can be carried out under mild reaction conditions (low pressure and temperature). The methodology that will be used is to transfer the VOCs from the gas phase to the aqueous phase by means of a scrubber to ensure an efficient photocatalytic degradation under UV light. The light efficiency will be optimized based on two different methods. The first method is via modification of standard TiO2 with plasmonic silver nanostructures. These nanostructures display surface plasmon resonance (SPR) in the UV part of the spectrum, which entails a significant electric near-field enhancement. The build-up of these intense local electric fields allows an efficient concentration of the incident photon energy in small volumes near the nanostructures. Since the rate of electron-hole pair formation is proportional to the intensity of the electric field, a drastic increase in charge carrier formation occurs. In order for this plasmonic "lens effect" to work, an energy match between the bandgap energy of the semiconductor and the energy associated with the SPR is required, which is the case for silver nanostructures. A second method to increase the UV light efficiency is by means of an innovative reactor design. A scrubber will be used to transfer the contaminated air flow to the aqueous phase leading to an enrichment of the VOCs in the aqueous phase. After that, the VOCs will be photocatalytically degraded in the aqueous phase, which is a better known concept than degradation in gas phase. The VOC degradation will occur via an optimized reactor design in which a UV transparent capillary tube is coated on the inside with photoactive material. This tube will be winded around a UV light source. In this way, there is a large contact time between pollutant and catalyst. Furthermore, this design ensures an active washing of the catalyst surface avoiding possible deactivation of the catalyst.

Researcher(s)

• Promoter: Lenaerts Silvia
• Co-promoter: Verbruggen Sammy
• Fellow: Blommaerts Natan

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project type(s)

• Research Project

Abstract

In this BOF KP TiO2-based photo-anodes are modified with plasmonic noble metal nanoparticles that shift the window of operation towards the visible light region of the solar spectrum. The main objectives are the detailed photo-electrochemical characterization of these plasmonic TiO2 photo-anodes and the fundamental elucidation of the plasmon-mediated working mechanism.

Researcher(s)

• Promoter: Verbruggen Sammy

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project type(s)

• Research Project

Abstract

Today's society has to cope with two persistent demands: sustainable energy production and a clean, healthy environment. This project aims at addressing both issues simultaneously in a single device. Air contaminated with volatile organic compounds (VOC) is administered to the photoanode compartment of a photo-electrochemical (PEC) cell. The photo-anode consists of a photocatalyst (TiO2) that mineralizes those VOCs under illumination. Protons formed during photoreaction diffuse through a solid electrolyte membrane towards the cathode side of the PEC cell. At the cathode protons are reduced with photogenerated electrons that are externally conducted from anode to cathode and hydrogen fuel is recovered. A big challenge of the proposed concept is to make the photo-anode visible light active. Photocatalysts such as TiO2 are activated only by UV light, which represents but 5% of the solar spectrum. In this project the photo-anode will be modified with unconventional and ffordable 'plasmonic' metal nanostructures with photoresponse tuned to the solar spectrum. They are expected to boost the PEC cell's efficiency by expanding the activity window of the photo-anode towards visible light or by improving the performance in the available wavelength range. Physico-chemical characterization, theoretical simulations of the light-matter interaction and actual PEC cell performance tests will lead to fundamental understanding and efficiency improvement of this sunlight-driven process.

Researcher(s)

• Promoter: Lenaerts Silvia
• Fellow: Verbruggen Sammy

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project type(s)

• Research Project

Abstract

Millions of people are currently suffering from the consequences of poor indoor air quality. Photocatalysis is a promising approach to remove harmful components from the air. The bottleneck thus far is the low efficiency of the photocatalytic reactions. A big step forward can be achieved by light harvesting antenna systems based on metal nanoparticles. They capture light of lower energy (in the visible light region) and with a higher efficiency. Photocatalytic ceramic foams with nanoparticle antennas are synthesized, characterized and tested towards their air purification properties.

Researcher(s)

• Promoter: Lenaerts Silvia
• Fellow: Verbruggen Sammy

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project type(s)

• Research Project

Abstract

Millions of people are currently suffering from the consequences of poor indoor air quality. Photocatalysis is a promising approach to remove harmful components from the air. The bottleneck thus far is the low efficiency of the photocatalytic reactions. A big step forward can be achieved by light harvesting antenna systems based on metal nanoparticles. They capture light of lower energy (in the visible light region) and with a higher efficiency. Photocatalytic ceramic foams with nanoparticle antennas are synthesized, characterized and tested towards their air purification properties.

Researcher(s)

• Promoter: Lenaerts Silvia
• Fellow: Verbruggen Sammy

Research team(s)

• Sustainable Energy, Air and Water Technology (DuEL)

Project type(s)

• Research Project