Binder-free reduced graphene oxide as electrode material for efficient supercapacitor with aqueous and polymer electrolytes

The demand for energy and energy storage devices is the urgent need of our society due to heavy dependence on electric appliances. Hence, the demand of graphene-like smart materials has grown tremendously in the past years. Herein, we investigated the binder-free graphene allies named reduced graphene oxide (rGO) as electrode materials for the supercapacitor after the reduction of graphene oxide by sinking and leaving process. The rGO-based devices show the areal specific capacitance of 80.2 and 7.89 mF cm −2 with aqueous 1M phosphoric acid (H 3 PO 4 ) and poly (vinyl alcohol)-H 3 PO 4 polymer gel electrolytes, respectively, over the graphite sheet.