Controlled Synthesis of Cobalt Oxide Electrode by Electrodeposition for Supercapacitor Application

Cobalt oxide (Co₃O₄) electrodes were prepared on conductive stainless still (SS) substrate using cobalt nitrate as a cobalt source by implementing simple and cost-effective chemical electrodeposition method and here, characterized for structural and electrochemical analysis for supercapacitor applications. The effect of different deposition potential on capacitance and charging-discharging stability of cobalt oxide electrode were studied. X-ray diffractions confirms the face centered cubic crystal structure of Co₃O₄ electrodes. Electrochemical capacitive analysis of cobalt oxide electrode was studied in 1MKOH aqueous electrolyte solution. The observed maximum specific capacitance attained with cobalt oxide was 273.3 F/g at scan rate 5mV/s. The observed specific power, specific energy and coulomb efficiency were 12.12W/kg, 74.75 Wh/kg, and 99.63%, respectively. The cycling stability of the cobalt oxides shows 62% up to 500 cycles.