Abstract
The freestanding flexible graphene oxide electrode material with higher energy density was prepared by the self-assembly process. The graphene oxide film was reduced under the nitrogen atmosphere to form nitrogen doped reduced graphene oxide film (N-rGO). N-rGO films were directly employed as electrodes (both cathode and anode) and solid-state polyvinyl alcohol/phosphoric acid as the separator for the solid-state supercapacitor structure. The structure was characterized without any metallic current collector. The specific capacitance of the device was 397 F/g, higher than that of the conventional liquid electrolyte system used for supercapacitors. The higher capacitance of the N-rGO system significantly increases the energy and power density values. The assembled flexible freestanding solid-state supercapacitor can be potentially used for energy storage applications.
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•Development of nitrogen doped reduced graphene oxide supercapacitors with solid-state electrolyte.•Improved specific capacitance with higher energy and power density.•Large area supercapacitors with high flexible.