Maity, S.Das, P.P.Mal, S.2026-02-052022Materials Technology, 2022, 37, 9, pp. 1129-113910667857https://doi.org/10.1080/10667857.2021.1924439https://idr.nitk.ac.in/handle/123456789/22891We have synthesized new electrode material for the supercapacitor application. Polyoxovanadates (POVs) have been used for energy storage electrode materials due to their fast multi-electron redox properties. The formation of SDV/GO composites was confirmed using various analytical methods, e.g., Fourier transforms infrared spectroscopy (FTIR) and powder X-ray diffraction (XRD), followed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The composite electrode’s electrochemical behavior was studied using a neutral 1 M sodium sulphate (Na2SO4) solution in three-electrode cyclic voltammetry (CV) system. The SDV/GO composite electrode showed a specific capacitance of 306 F/g for a scan rate of 5 mV/s and a corresponding energy density of 42.4 Wh/Kg. Galvanostatic charge/discharge exhibits a specific capacitance of 310 F/g with energy densities of 43.08 Wh/kg. Electrochemical impedance spectroscopy (EIS), which was used to investigate interface property, yielded a considerably higher power density of 172.41 KW/kg with an equivalent series resistance of 5 ?. © 2021 Informa UK Limited, trading as Taylor & Francis Group.CapacitanceCyclic voltammetryElectric resistanceElectrochemical electrodesElectrochemical impedance spectroscopyFourier transform infrared spectroscopyFourier transformsGrapheneHigh resolution transmission electron microscopyNanocompositesScanning electron microscopySodium sulfateSulfur compoundsComposites electrodesCyclic voltammogramsElectrochemical capacitorElectrode materialEnergy densityGraphene oxide nanocompositesSodium decavanadateSpecific capacitanceSupercapacitor applicationSynthesisedSupercapacitor