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

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.