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Issue 3, 2019
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Ultrahigh energy density asymmetric electrochemical capacitors based on flower-like ZnO/Co3O4 nanobundle arrays and stereotaxically constricted graphene

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Abstract

In this study, unique hierarchical flower-like ZnO/Co3O4 nanobundle arrays grown on nickel foam have been synthesized via a facile hydrothermal method. The morphology evolution of the ZnO/Co3O4 nanobundles arrays for different contents and reaction times was investigated in detail. The hierarchical structures of the ZnO/Co3O4 nanobundle arrays have a large contact area with electrolyte, and have the advantage of excellent ion diffusion and good electronic transport. Consequently, when used as supercapacitors, the ZnO/Co3O4 nanobundle array electrodes show remarkable specific capacitance of up to 1983 F g−1 at a current density of 2 A g−1 and 833 F g−1 at a higher current density of 20 A g−1, and 84.5% of the specific capacitance was still retained at 10 A g−1 after 5000 cycles. Furthermore, a ZnO/Co3O4 NBs-1//stereotaxically constricted graphene asymmetric supercapacitor device was also produced and was shown to exhibit an ultrahigh energy density of 70.4 W h kg−1 at a power density of 779.8 W kg−1. The ZnO/Co3O4 nanobundle electrodes display excellent electrochemical performance, which makes them promising electrode materials for practical application in supercapacitors.

Graphical abstract: Ultrahigh energy density asymmetric electrochemical capacitors based on flower-like ZnO/Co3O4 nanobundle arrays and stereotaxically constricted graphene

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Publication details

The article was received on 21 Oct 2018, accepted on 11 Dec 2018 and first published on 12 Dec 2018


Article type: Paper
DOI: 10.1039/C8TA10113B
Citation: J. Mater. Chem. A, 2019,7, 1273-1280

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    Ultrahigh energy density asymmetric electrochemical capacitors based on flower-like ZnO/Co3O4 nanobundle arrays and stereotaxically constricted graphene

    N. Hu, W. H. Gong, L. Huang and P. K. Shen, J. Mater. Chem. A, 2019, 7, 1273
    DOI: 10.1039/C8TA10113B

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