Effect of temperature on the electrochemical performance of silver oxide thin films supercapacitor

Abstract

Abstract The effect of temperature change on the electrochemical performance of silver oxide thin films supercapacitor in an aqueous electrolyte (saline solution), is presented in this paper. Scanning electron microscopy and energy-dispersive X-ray spectroscopy (EDX) were used to probe the morphology and the elemental constituent of the prepared silver oxide thin films electrode. The stoichiometry along with oxide phases of the film was observed with X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The effect of temperature in the range 35\u202f°C to 75\u202f°C, on the electrochemical performance of the films was evaluated by applying electrochemical impedance spectroscopy (EIS), charge-discharge, and cyclic voltammetry (CV). The EIS and CV results indicate improved electrochemical performance as operating temperature increases, with an increase in capacitance and reduction in equivalent series resistance observed. The enhanced electrochemical capacity of the silver oxide thin films with temperature can be attributed to higher ionic conductivity, reduced resistance, and faster ion adsorption/desorption at higher temperatures.