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Issue 4, 2017
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Serpent-cactus-like Co-doped Ni(OH)2/Ni3S2 hierarchical structure composed of ultrathin nanosheets for use in efficient asymmetric supercapacitors

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Abstract

Herein, a rational Co-doped Ni(OH)2/Ni3S2 hybrid was designed and grown in situ on Ni foam (NiCo-10) via a one-pot hydrothermal reaction with two-step temperature control, avoiding the utilization of complicated production processes or high-end technology. Interestingly, the as-prepared NiCo-10 presents a distinct one-dimensional serpent-cactus-like structure consisting of ultrathin internal nanosheets. As a supercapacitor electrode, the hinder-free NiCo-10 exhibits an ultrahigh specific capacitance value of 3023.4 F g−1 at 1 A g−1 and excellent rate performance (capacitance retention of 82.9% up to 20 A g−1), owing to the distinct and available ultrathin serpent-cactus-like structure. Meanwhile, an asymmetric supercapacitor is developed, wherein NiCo-10 is utilized as a positive electrode and activated carbon as a negative electrode. The asymmetric device could exhibit a high specific capacitance value of 136.2 F g−1 (at 1 A g−1), high energy densities of 51.5 W h kg−1 (at 0.825 kW kg−1) and 23.0 W h kg−1 (even at 8.25 kW kg−1), and appropriate cycling stability. The efficient electrochemical performance of NiCo-10 makes it a promising electrode material for the energy storage field.

Graphical abstract: Serpent-cactus-like Co-doped Ni(OH)2/Ni3S2 hierarchical structure composed of ultrathin nanosheets for use in efficient asymmetric supercapacitors

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Publication details

The article was received on 04 Nov 2016, accepted on 06 Dec 2016 and first published on 23 Dec 2016


Article type: Paper
DOI: 10.1039/C6TA09547J
Citation: J. Mater. Chem. A, 2017,5, 1603-1613
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    Serpent-cactus-like Co-doped Ni(OH)2/Ni3S2 hierarchical structure composed of ultrathin nanosheets for use in efficient asymmetric supercapacitors

    L. Ye, L. Zhao, H. Zhang, P. Zan, S. Gen, W. Shi, B. Han, H. Sun, X. Yang and T. Xu, J. Mater. Chem. A, 2017, 5, 1603
    DOI: 10.1039/C6TA09547J

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