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Cobalt oxides are prepared by calcining the precursor at different temperatures. The precursor is precipitated by using Co(NO3)2∙6H2O dissolved in $N H_{3}-N H_{4}^{+}$ buffer solution at pH=9.75. The samples are Co3O4 mixing with honeycomb-like morphology which proved by XRD and SEM analysis. The electrochemical results demonstrate that the best electrochemical performance of Co3O4 is exhibit-ed when the calcination temperature is 450℃. When the current density increases from 1 A∙g-1 to 10 A∙g-1, the specific capacitance de-creases from 453F∙g-1 to 249 F∙g-1. After 1000 cycles charge and discharge at 1A∙g-1, up to 87% of the retention rate can be achieved, and the internal resistance of the material is less than 1Ω.
Cobalt oxides; Calcination temperature; Electrochemical properties; Preparation
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