Redox additive aqueous polymer gel electrolyte for an electric double layer capacitor

A hydroquinone mediated PVA-H2SO4 gel electrolyte (PHHQ) and activated carbon from bio-waste were prepared for super-capacitor fabrication. PHHQ delivered a higher capacitance (941 F g(-1) at 1 mA cm(-2)) and energy density (20 Wh kg(-1) at 0.33 W g(-1)) than the PVA-H2SO4 gel electrolyte (425 F g(-1) at 1 mA cm(-2), 9Wh kg(-1) at 0.33 W g(-1)).