Solvothermal synthesis and electrochemical properties of octahedral cobalt oxide decorated with Ag₂O

Abstract

Octahedral CoO with nanostructures decorated with Ag nanoparticles was prepared via a facile solvothermal approach. After being annealed at 500 °C for 1 h, an electrochemical capacitor material of Co₃O₄ decorated with Ag₂O was obtained. The cyclic voltammetry and galvanostatic charge-discharge were used to evaluate the electrochemical properties of the as-prepared products. The results indicated that the as-prepared samples exhibited fine pseudo-capacitive performance, and the surface modifications of Ag₂O can significantly increase the capacitance of the Co₃O₄ material. The specific capacitance of Ag₂O/Co₃O₄ composite electrode was up to 217.6 F·g⁻¹, which was 3.35 times as high as that of pure Co₃O₄. Moreover, Ag₂O/Co₃O₄ composite showed an excellent cycle performance, and 65.3% of specific capacitance was maintained after 200 cycles.

Keywords

cobalt oxide / silver oxide / octahedral / electrochemical

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