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Issue 20, 2017
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Simple synthesis of graphene-doped flower-like cobalt–nickel–tungsten–boron oxides with self-oxidation for high-performance supercapacitors

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Abstract

In this study, we devised an easy and simple approach to synthesize a composite of flower-like cobalt–nickel–tungsten–boron oxides (Co–Ni–W–B–O) that were doped with reduced graphene oxide (rGO); the composite was designed for supercapacitor applications. A Co–Ni–W–B alloy was first deposited on rGO through one-pot chemical reduction in an ethanol solution at room temperature. The resulting Co–Ni–W–B alloy self-oxidized in air on the rGO surface. The Co–Ni–W–B–O/rGO composites resembled three-dimensional flowers with a high surface area; they also exhibited superior electrochemical performance when compared to most previously reported electrodes based on nickel–cobalt oxides. Furthermore, the Co–Ni–W–B–O/rGO composite prepared in an ethanol solution showed much higher electrochemical performance than the composite prepared in water. The Co–Ni–W–B–O/rGO electrode showed an ultrahigh specific capacitance of 1189.1 F g−1 at 1 A g−1 and exhibited a high energy density of 49.9 W h kg−1 along with remarkable cycle stability (10 000 cycles with 80.7% capacitance retention at 15 A g−1), which is promising for its application in energy storage devices.

Graphical abstract: Simple synthesis of graphene-doped flower-like cobalt–nickel–tungsten–boron oxides with self-oxidation for high-performance supercapacitors

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Publication details

The article was received on 08 Jan 2017, accepted on 21 Apr 2017 and first published on 21 Apr 2017


Article type: Paper
DOI: 10.1039/C7TA00234C
Citation: J. Mater. Chem. A, 2017,5, 9907-9916
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    Simple synthesis of graphene-doped flower-like cobalt–nickel–tungsten–boron oxides with self-oxidation for high-performance supercapacitors

    C. Xiang, Q. Wang, Y. Zou, P. Huang, H. Chu, S. Qiu, F. Xu and L. Sun, J. Mater. Chem. A, 2017, 5, 9907
    DOI: 10.1039/C7TA00234C

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