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Issue 25, 2015
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Ni3S2@CoS core–shell nano-triangular pyramid arrays on Ni foam for high-performance supercapacitors

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Abstract

In this study, we demonstrate a facile method to fabricate novel Ni3S2 nano-triangular pyramid (NTP) arrays on Ni foam through a hydrothermal process and build unique Ni3S2@CoS core–shell NTP arrays by electro-deposition. The obtained Ni3S2@CoS material displays twice the specific capacitance of the pure Ni3S2 material in both a three-electrode system (4.89 F cm−2 at 4 mA cm−2) and asymmetric supercapacitor device (0.69 F cm−2 at 1.43 mA cm−2). In addition, the asymmetric supercapacitor demonstrates the outstanding energy density of 28.24 W h kg−1 at a power density of 134.46 W kg−1, with a stable cycle life (98.83% retained after 2000 cycles). The unique structure of the Ni3S2@CoS core–shell NTP arrays, which provides an ultra-thin CoS shell to enlarge efficient areas, introduces good conductivity, and short transportation lengths for both ions and electrons, contributes most to its excellent performance. Moreover, the bare Ni3S2 NTP arrays can be used as a new template to build other potential electrode materials.

Graphical abstract: Ni3S2@CoS core–shell nano-triangular pyramid arrays on Ni foam for high-performance supercapacitors

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Publication details

The article was received on 03 Apr 2015, accepted on 15 May 2015 and first published on 19 May 2015


Article type: Paper
DOI: 10.1039/C5CP01945A
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Phys. Chem. Chem. Phys., 2015,17, 16434-16442

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    Ni3S2@CoS core–shell nano-triangular pyramid arrays on Ni foam for high-performance supercapacitors

    R. Li, S. Wang, J. Wang and Z. Huang, Phys. Chem. Chem. Phys., 2015, 17, 16434
    DOI: 10.1039/C5CP01945A

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