Activated carbon is the most widely used electrode material in electrochemical double-layer capacitors. Cashew nutshell-derived activated carbon (CNSAC) exhibits a highly porous structure with reasonable surface area and high pore volume, which indicates that it is a good electrode material. Electrochemical characterizations confirmed the formation of the electric double layer in the system with high specific capacitance and excellent retention in capacitance even after thousand cylces of charge/discharge. It is found that CNSAC has great potential as a low-cost and environmentally friendly electrode material for highly efficient supercapacitors.
Biomass derived activated carbon has attracted well‐deserved attention in the realm of energy storage applications due to its high porosity and excellent electrochemical properties. In this study, cashew nutshell derived activated carbon (CNSAC) exhibits a highly interconnected and honeycomb like microporous structure with a large specific surface area of 835 m2 g−1 and a high pore volume of 0.4 m3 g−1. These superior structural features of CNSAC facilitate rapid diffusion of electrolyte and improve its electrochemical efficiency, which is desirable for electrode material. Fabrication of symmetrical supercapacitors (SSC) employing water in salt (WIS) electrolyte validates the outstanding electrochemical performance of CNSAC electrode material. WIS based SSC had a remarkable specific capacitance of 110 Fg−1 at a current density of 1 Ag−1 over a wider electrochemical stability window of 0–2 V, suggesting that WIS electrolytes can address the limitations of conventional aqueous electrolytes and have significant potential for diverse supercapacitor applications.
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