Co3O4 thin film prepared by a chemical bath deposition for electrochemical capacitors |
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Authors: | Yanhua Li Kelong Huang Zufu Yao Suqin Liu Xiaoxia Qing |
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Affiliation: | aCollege of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, China;bDepartment of Chemical Engineering and Environmental Protection, Changsha Aeronautical Vocational and Technical College, Changsha, Hunan 410124, China |
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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 227 F g−1 at the specific current of 0.2 A g−1. The specific capacitance reduces to 152 F g−1 when the specific current increases to 1.4 A g−1. The specific capacitance retention ratio is 67% at the specific current range from 0.2 to 1.4 A g−1. |
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Keywords: | Electrochemical capacitors Co3O4 thin film Chemical bath deposition Capacitive properties |
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