Composite materials based on disordered carbon as supercapacitor electrodes

Datum: 15 november 2019

Locatie: UAntwerp, Campus Groenenborger, Room U.408 - Groenenborgerlaan 171 - 2020 Antwerp (Wilrijk) (route: UAntwerpen, Campus Groenenborger)

Tijdstip: 11.30 - 12.30 uur

Organisatie / co-organisatie: EMAT

Korte beschrijving: Friday Lecture by Daniel Arenas Esteban, EMAT

About the lecture

Electrochemical double layer capacitors (EDLC), commonly referred as supercapacitors, are electrochemical energy storage devices that can provide more energy than a common capacitor and deliver or capture it faster than a battery. Nowadays, this type of devices has attracted considerable interest because they have excellent reversibility, practically unlimited cyclability (> 1,000,000 cycles) and a simple operation mode, offering solutions in applications where a rapid energy boost is required. Current efforts and research are aimed at increasing their energy density without losing power, in order to obtain new devices that reach or even surpass the energy density of a battery while simultaneously maintaining the advantages of supercapacitors.

The main energy storage mechanism in such devices is the electrical capacity or capacitance, which is based on the reversible adsorption of electrolyte ions onto the surface of the electrodes, forming an electrochemical double layer. There is no faradaic reaction and the energy remains stored in aggregated charges at the surface of the electrode material. Therefore, the higher the surface area, the more energy could be stored, and that’s why microporous disordered carbon materials are the most commonly used electrodes and the one found in commercial devices. On the other hand, compounds able to interact with the electrolyte by quick and reversible faradaic redox reactions can present a similar behavior for energy storage, which by similarity is called pseudocapacitance mechanism.

In this communication, different approaches focused on obtaining new composite materials based on disordered carbon with improved gravimetric and volumetric capacitances will be presented.