Preparation and Electrochemical Characterization of Nanospherical Co3O4
Transition metal oxides are one of the most widely used electrode materials owing to their high specific capacitance and good electrochemical stability.Nano-spherical Co3O4 was synthesized using cobalt chloride hexahydrate(CoCl2·6H2O),urea,sodium dodecyl sulfate(SDS),and cyclohexane as the raw materials through the microemulsion method,and Co3O4 electrode materials were subsequently prepared.The effects of the microemulsion reaction temperature,SDS and the amount of CoCl2·6H2O on the electrochemical properties of the Co3O4 electrode materials during the preparation process were investigated in particular.The electrochemical performances of Co3O4 were analyzed by cyclic voltammetry test,constant-current charge/discharge(GCD),and long-cycle test.The results show that the Co3O4 prepared at the reaction temperature of 140 ℃,with 1.5 g of SDS and 8 mmol of CoCl2·6H2O exhibited the best electrochemical performance,with a specific capacitance as high as 371.428 F/g at a current density of 1 A/g,and capacitance retention rate was 73.76％after 1000 GCD tests at a current density of 2 A/g.
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