Abstract
An electrode for supercapacitor using 3-dimensional porous nickel foam as a current collector and cobalt oxide as an active material was prepared and characterized in terms of morphology observation, crystalline property analysis, and the investigation of electrochemical property. The electrode surface showed that the cobalt oxide was homogeneously coated as the crystalline phase of Co₃O₄. Cyclic voltammetry for the Co₃O₄/nickel foam electrode exhibited higher specific capacitance values (445 F/g at 10 ㎷/s and 350 F/g at 200 ㎷/s) and excellent capacitance retention ratio (99% after 10⁴ cycles). It was proved that the nickel foam substrate played the roles in reducing the interfacial resistance with cobalt oxide and in improving the electrode density by embedding greater amount of cobalt oxide within it.
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