Impact of effective mass of active material in the electrode for the performance of symmetrical, all solid-state double layer supercapacitors

Supercapacitors have been identified as one of the key energy storage devices with their excellent ability to bridge the gap between batteries and conventional capacitors in terms of power and energy. A great amount of research activities is being carried out to improve their performance to serve for worldwide day-to-day applications such as power backups, automobiles and power generators. This study is about determining the suitable active mass loading of reduced graphene oxide (RGO) based electrodes in solid state supercapacitors using cyclic voltammetry technique. The potential window of (0.01-1.2) V showed the highest single electrode specific capacitance (C_sc) for the mass loading of 2 mg cm^-2. As per the selected scan rates for the test, 10 mV s^-1 exhibited the optimum C_sc again for the same mass loading. Continuous cycling was done for 1000 cycles. Supercapacitor with the same mass loading had a higher C_sc continuously throughout the 1000 cycles and also, its rate of reduction of C_sc was lower.