Synergistic effect of nitrogen-doped reduced graphene oxide on layered iron vanadate (FeV3O9.2.6H2O) for symmetry coin-cell supercapacitor application in aqueous electrolyte

Abstract

With characteristic large interlayer spacing with multiple electrochemical reactions, iron vanadate (FeV3O9.2.6H2O) is of great interest as promising electrode material for various energy storage systems. This report presents the investigation of the electrochemical performance of nitrogen-doped reduced graphene oxide of iron vanadate (FVO@N-rGO) composite in an aqueous symmetric coin-cell. With enhanced specific surface area, FVO@N-rGO electrode exhibit high specific capacitance of 579 Fg-1 at current density 0.2 Ag-1, energy and power densities of 22 Whkg-1 and 50kWkg-1, respectively, in comparison to specific capacitances of FVO@rGO (338 Fg-1) and pristine FVO (90 Fg-1) electrodes. The improved performance of FVO@N-rGO is due to the synergistic effect of nitrogen-doping of reduced graphene oxide and FVO.