Charging/discharging behavior of manganese oxide electrodes in aqueous electrolyte prepared by galvanostatic electrodeposition

Abstract

Energy storage devices with high energy density have been used in many electronic devices in recently years. A supercapacitor is one such device, but lower energy density has limited its applications. In this study, manganese oxide deposited on a titanium substrate at various deposition temperatures using the galvanostatic electrodeposition method as the electrodes of a supercapacitor was investigated. The specific capacitance of a supercapacitor is depended on the deposition temperature and is affected by the surface morphology and roughness of the electrode surface. At a deposition temperature of 15°C, manganese oxide showed a needle-like appearance, a roughness of 60.0 nm, and a maximum specific capacitance of 225.3 Fg-1. The charging/discharging behavior of a supercapacitor was analyzed in 0.1 M Na 2SO4 aqueous electrolyte at various measuring temperatures and operating potential voltage ranges. The supercapacitor achieved a high energy density of 37.70 Whkg-1 in a 0.1 M Na2SO 4 electrolyte at 25°C in an operation range of 0 to 1.3 V.