Concentration and Volume of the Spraying Solution Affects on the Capacitive Behaviour of the Co₃O₄ Thin Films

This work reports the preparation of Co₃O₄ thin film electrodes on stainless steel plates through aqueous route by spray pyrolytic decomposition. Samples were prepared by varying the concentration and volume of the spraying solution XRD and SEM studies of the prepared Co₃O₄ thin films reveals nanocrystalline face centered cubic crystal structure with micro porous adherent morphology. Prepared Co₃O₄ thin film electrodes shows ideal rectangular behaviour exhibit maximum value of the specific capacitance 107 F/g at the scan rate 2 mV/sec in 1 M KOH electrolyte. From chronopotentiometry the calculated values of specific energy and specific power were 2.104 Wh/kg and 1.77 kW/kg at the current density 16 mA/cm2. Impedance variation was studied in the frequency range 1 mHz to 1 MHz to determine internal resistance and different circuitry parameters.