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The synthesis of hierarchical ZnCo2O4@MnO2 core–shell nanosheet arrays on Ni foam for high-performance all-solid-state asymmetric supercapacitors

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Abstract

Hierarchical ZnCo2O4@MnO2 core–shell nanosheet arrays were successfully synthesized on Ni foam via a facile hydrothermal method followed by a calcination process. The fabricated ZnCo2O4@MnO2 electrode exhibited a specific capacitance as high as 2170.00 F g−1 (2.60 F cm−2) at a current density of 3 mA cm−2 in a 1 M KOH solution. Furthermore, an all-solid-state asymmetric supercapacitor (ASC) device fabricated with the as-prepared ZnCo2O4@MnO2 as the positive electrode and activated carbon (AC) as the negative electrode in the PVA/KOH gel electrolyte achieved a high energy density of 29.41 W h kg−1 at a power density of 628.42 W kg−1 and retained 95.3% of its initial capacitance after 3000 cycles at a high current density of 10 mA cm−2. With the smart design and remarkable electrochemical properties, the hierarchical ZnCo2O4@MnO2 core–shell nanosheet arrays on Ni foam demonstrated great potential for further applications in the energy storage field.

Graphical abstract: The synthesis of hierarchical ZnCo2O4@MnO2 core–shell nanosheet arrays on Ni foam for high-performance all-solid-state asymmetric supercapacitors

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Publication details

The article was received on 12 Nov 2017, accepted on 20 Dec 2017 and first published on 20 Dec 2017


Article type: Research Article
DOI: 10.1039/C7QI00706J
Citation: Inorg. Chem. Front., 2018, Advance Article
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    The synthesis of hierarchical ZnCo2O4@MnO2 core–shell nanosheet arrays on Ni foam for high-performance all-solid-state asymmetric supercapacitors

    D. Yu, Z. Zhang, Y. Meng, Y. Teng, Y. Wu, X. Zhang, Q. Sun, W. Tong, X. Zhao and X. Liu, Inorg. Chem. Front., 2018, Advance Article , DOI: 10.1039/C7QI00706J

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