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Facile synthesis and catalytic performance of Co3O4 nanosheets in-situ formed on reduced graphene oxide modified Ni foam

Abstract

A three-dimensional (3D) catalyst electrode of Co3O4 nanosheets in-situ formed on reduced graphene oxide modified Ni foam (Co3O4/rGO@Ni foam) for H2O2 electroreduction is prepared by two-step hydrothermal method. In the first step, graphene oxide sheets are reduced and formed on the skeleton of Ni foam and Co3O4 nanosheets are synthesized intermixed with the rGO sheets through the second step. The Co3O4 nanosheets are made up of plentiful nanoparticles and there are many nanoholes among these nanoparticles which are beneficial to the sufficient contact between H2O2 and catalyst. The morphology and phase composition of Co3O4/rGO@Ni foam electrode are studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The electrocatalytic activity of the as-prepared electrode is investigated by cyclic voltammetry (CV) and chronoamperometry (CA). From the results, it can be seen that in 2 mol L-1 NaOH and 0.5 mol L-1 H2O2, the reduction current density of H2O2 on the Co3O4/rGO@Ni foam electrode is 450 mA cm-2 at -0.8 V which is much higher than that on Co3O4 directly supported on Ni foam. This obvious promotion of current density can be attributed to the increase of surface area of the electrode after the addition of rGO. Also, the interpenetrating of rGO and Co3O4 nanosheets improves the electron and ion transport ability of the electrode which leads to a good electrocatalytic activity and stability of the Co3O4/rGO@Ni foam electrode.

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Publication details

The article was accepted on 11 Sep 2017 and first published on 11 Sep 2017


Article type: Paper
DOI: 10.1039/C7DT03048G
Citation: Dalton Trans., 2017, Accepted Manuscript
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    Facile synthesis and catalytic performance of Co3O4 nanosheets in-situ formed on reduced graphene oxide modified Ni foam

    C. Song, X. Yin, B. Li, K. Ye, K. Zhu, D. Cao, K. Cheng and G. Wang, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT03048G

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