Abstract
MnO2 metal oxide electrode material is synthesized by simple electrodeposition method on stainless steel substrate. The crystal structure and surface morphological characterizations of the obtained electrode are carried out by using X-ray diffraction (XRD) technique and Field Emission-Scanning Electron Microscopy (FE-SEM) respectively. The FE-SEM micrographs show highly porous well developed interconnected uniform nanosphere like morphology. The electrochemical properties of MnO2 electrode like Cyclic Voltammetry (CV), Galvanostatic Charge-Discharge (GCD) and Electrochemical Impedance Spectroscopy (EIS) etc are studied in a 0.5 M Na2SO4 solution as electrolyte. The maximum specific capacitance is 543 F/g at scan rate 5 mVs-1 obtained from cyclic voltammetry (CV). The electrochemical stability of MnO2 electrode is investigated using cyclic voltammetry for 1000 cycles. The MnO2 electrode exhibits good cycling stability for 1000 cycles at scan rate100 mVs-1. The values of energy density and power density of MnO2 electrode material obtained from Galvanostatic charge-discharge studies. From all the electrochemical properties of MnO2 electrode, it indicates that it will be promising electrode material for supercapacitor application.
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