Supercapacitor Electrode Based on Agricultural Waste Derived Biochar Materials

In this study, we report a fast and simple method for synthesis biochars from biomass sugarcane bagasse as a raw material. The biochars material possesses a good porous structure after one-step carbonization in a normal anaerobic furnace with an amorphous phase and a good specific surface area of 272.75 m² g⁻¹. The sugarcane bagasse-derived biochars show a harmonious agreement with the gel polymer electrolyte via electrochemical investigation. The electrical double layer supercapacitor cell demonstrates a good charge-discharge rate capability and also good specific capacitance. The porous biochars obtain electrode specific capacitance of 48 F g⁻¹ at a current density of 2 A g⁻¹ and the maximum energy density is about 7.71 W h kg⁻¹ at a power density of 1028 W kg⁻¹. This study provides a promising route for recycling waste biomass in energy storage applications.