Preparation and capacitance properties of Ni foam@graphene@Co₃O₄ composite electrode materials

Abstract

Graphene under high temperature was prepared and loaded on Ni foam. Then, cobalt tetroxide precursor was grown on Ni foam in situ by the hydrothermal method. Finally, the sample was burned at high temperature to obtain Co₃O₄+graphene@Ni. The hydrothermal method used in this paper is easy to operate, with low-risk factors and environmental protection. The prepared Co₃O₄+graphene@Ni electrode exhibits superior electrochemical performance than Co₃O₄@Ni electrode. At a current density of 1 A/g, the specific capacitance of the Co₃O₄+graphene@Ni electrode calculated by a charge-discharge test is 935 F/g, which is much larger than that of Co₃O₄@Ni electrode of 340 F/g.

Keywords

hydrothermal method / supercapacitor / cobaltosic oxide / graphene / in-situ growth

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