Abstract
Co3O4 thin film is synthesized on ITO by a chemical bath deposition. The prepared Co3O4 thin film is characterized by X-ray diffraction, and scanning electron microscopy. Electrochemical capacitive behavior of synthesized Co3O4 thin film is investigated by cyclic voltammetry, constant current charge/discharge and electrochemical impedance spectroscopy. Scanning electron microscopy images show that Co3O4 thin film is composed of spherical-like coarse particles, together with some pores among particles. Electrochemical studies reveal that capacitive characteristic of Co3O4 thin film mainly results from pseudocapacitance. Co3O4 thin film exhibits a maximum specific capacitance of 227Fg−1 at the specific current of 0.2Ag−1. The specific capacitance reduces to 152Fg−1 when the specific current increases to 1.4Ag−1. The specific capacitance retention ratio is 67% at the specific current range from 0.2 to 1.4Ag−1.
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