Insights in the synthesis and electrochemical performance of tin tailings/grapheme derived from rice husk/polyester composite electrode materials for supercapacitors

The blending of waste tin tailings with graphene derived from waste rice husks in the production of high-specific capacitance supercapacitors was developed in this work. Alkaline treatment method was used to develop graphene from rice husks. The doping casting method was used to produce 0, 10, 20, and 30 wt% graphene with constant 20 wt% tin tailings. Cyclic voltammetry (CV), electrochemical impedance spectroscopy, scanning electron microscopy, and X-ray diffractogram (XRD) were used to analyze the composite electrode material. The specific capacitance rises with an increase in the dopant graphene of up to 30% with a specific capacitance of 379.58 at a 5 mV/s scanning rate. The high specific capacitances obtained are within the standard for flexible supercapacitors. It was established that waste tin tailings and graphene derived from waste rice husks could be used in the production of low-cost supercapacitors.