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Issue 4, 2018
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Mesoporous NiCo2O4 nanoneedle arrays as supercapacitor electrode materials with excellent cycling stabilities

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Abstract

In this work, mesoporous NiCo2O4 nanoneedle arrays grown on a nickel foam substrate are fabricated by a facile hydrothermal route. The as-synthesized NiCo2O4 products as binder-free electrodes for supercapacitors show a superior discharge areal capacity of 0.998 C cm−2 at a current density of 2 mA cm−2, excellent rate performance (60.25% retention with current density increasing from 2 mA cm−2 to 200 mA cm−2) and outstanding cycling stability (about 19.3% loss after 12 000 cycles at a current density of 20 mA cm−2). An assembled supercapacitor using a NiCo2O4 electrode as the positive electrode delivers a volumetric energy density of 0.33 mW h cm−3 at a volumetric power density of 12 mW h cm−3 and still achieves 63.6% retention with the volumetric power density increasing to 120 mW h cm−3. Surprisingly, 140.6% capacity retention is attained after 8000 cycles at 10 mA cm−2.

Graphical abstract: Mesoporous NiCo2O4 nanoneedle arrays as supercapacitor electrode materials with excellent cycling stabilities

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Publication details

The article was received on 05 Jan 2018, accepted on 04 Feb 2018 and first published on 05 Feb 2018


Article type: Research Article
DOI: 10.1039/C8QI00010G
Citation: Inorg. Chem. Front., 2018,5, 835-843
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    Mesoporous NiCo2O4 nanoneedle arrays as supercapacitor electrode materials with excellent cycling stabilities

    C. Liu, W. Jiang, F. Hu, X. Wu and D. Xue, Inorg. Chem. Front., 2018, 5, 835
    DOI: 10.1039/C8QI00010G

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