Supercapacitor electrodes with especially high rate capability and cyclability based on a novel Pt nanosphere and cysteine-generated graphene

Abstract

In the present work, supercapacitors based on graphene/Pt films show especially high rate capability (120 F g⁻¹ even at 50 A g⁻¹) and cyclability (no attenuation over 10 000 cycles) and peculiar nanosphere morphology after electrochemical cycling. Furthermore, supercapacitors based on the graphene powder with a binder exhibit high specific capacitance (249 F g⁻¹ at 0.1 A g⁻¹), long cycle life (no attenuation over 40 000 cycles) and high rate capability (150 F g⁻¹ even at 50 A g⁻¹), which are much better than those of most graphene electrode materials. These indicate the great potential of the cysteine reduced graphene electrodes in energy storage.