Electrochemical synthesis and investigation of nano MnO2 electrode material for supercapacitor application

Abstract

MnO 2 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 MnO 2 electrode like Cyclic Voltammetry (CV), Galvanostatic Charge-Discharge (GCD) and Electrochemical Impedance Spectroscopy (EIS) etc are studied in a 0.5 M Na 2 SO 4 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 MnO 2 electrode is investigated using cyclic voltammetry for 1000 cycles. The MnO 2 electrode exhibits good cycling stability for 1000 cycles at scan rate100 mVs -1 . The values of energy density and power density of MnO 2 electrode material obtained from Galvanostatic charge-discharge studies. From all the electrochemical properties of MnO 2 electrode, it indicates that it will be promising electrode material for supercapacitor application.