Synthesis of MnO 2 electrode material by electro-deposition method for the enhanced capacitive properties

Abstract

Supercapacitor is an alternative for the conventional battery source owing to the safety, electrochemical stability, high power density, short charging time and long cycle life. In this view, MnO2 as an electrode material was synthesized via electrodeposition method to produce MnO2 thin films on stainless steel substrates as an electrochemical supercapacitors. The various characterization techniques were employed to study their physico-chemical properties. The scanning electron microscopy reveals interconnected nanowalls-like morphology of MnO2 thin films, which offers a higher surface area. As a function of the surface morphology, the synthesized MnO2 thin film-based capacitor showed highest specific capacitance of 464.45 Fg-1 at a low scan rate of 10mV.s-1 and galvonostatics charge discharge specific capacitance of 284.05 Fg-1 for current density of 1mA/cm2. In addition, the MnO2 based supercapacitor has also shown the higher cyclic stability at about 98% even after 500 cyclic voltammetry test.