The Impact of Incorporating Reduced Graphene Oxide Quantum Dots into KOH Electrolyte on the Electrochemical Performance of Supercapacitors Using Sugarcane Bagasse Active Electrodes

Abstract

/g. The active electrodes made with AC3D-SAC and rGO-QDs-3%/6M-KOH for the half-cell electrode showed the highest specific capacitance of 176.83 F/g at 0.5 A/g. The working electrode symmetric supercapacitor coin cell device, using the rGO-QDs-3%/6M-KOH electrolyte, achieved a maximum specific capacitance of 54.53 F/g at 0.5 A/g. These results were twice as high as those with the KOH electrolyte alone. The efficiency retention of the coin cell dropped to 90% after 5000 cycles. The supercapacitor demonstrated impressive electrochemical performance with high ionic conduction and capacitance, thanks to the rGO-QDs/6M-KOH electrolyte and the large surface area of the AC3D-SAC active carbon. The findings confirmed that adding rGO-QDs to the KOH electrolyte improved the electrochemical performance of the symmetric supercapacitor device.