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Researchers at A*STAR have developed an ‘asymmetric’ supercapacitor based on vertically aligned graphene nanosheets coated with iron nitride and titanium nitride as the anode and cathode, that could be a viable energy storage solution.
While traditional supercapacitors use the same material for both electrodes, the anode and cathode in an asymmetric supercapacitor are made up of different materials. Scientists initially used metal oxides as asymmetric supercapacitor electrodes, but as metal oxides do not have particularly high electrical conductivity and become unstable over long operating cycles, it was clear that a better alternative was needed.