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Issue 22, 2018
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Co-doped Ni3S2@CNT arrays anchored on graphite foam with a hierarchical conductive network for high-performance supercapacitors and hydrogen evolution electrodes

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Abstract

Engineering the surface structure and constructing a suitable internal conductive network is essential for the electron transfer rate and the active material utilization efficiency of an electrode. Here, high-porosity carbon nanotube (CNT) arrays grown on graphite foam (GNF) are synthesized via the self-sacrificial ZnO nanorod template. Then three-dimensional Co-doped Ni3S2 nanostructures (Co–Ni3S2) are coated on the CNT surface via a simple hydrothermal process. The CNTs/GNF hybrid with a hierarchical conductive network exhibits good electrical conductivity, while the tectorum-like Co–Ni3S2 nanosheet structure may facilitate both the ion and electron transfer in the redox process. Therefore, the Co–Ni3S2@CNTs/GNF composite shows a highest specific capacitance of 4.1 F cm−2, good rate performance (57.8% capacitance retention from 1 to 40 mA cm−2) and cycling stability (89.8% capacitance retention after 1000 cycles). Moreover, the Co–Ni3S2@CNT/GNF electrode also reveals good hydrogen evolution reaction activity in alkaline solution (an overpotential of 155 mV at 10 mA cm−2).

Graphical abstract: Co-doped Ni3S2@CNT arrays anchored on graphite foam with a hierarchical conductive network for high-performance supercapacitors and hydrogen evolution electrodes

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Publication details

The article was received on 05 Apr 2018, accepted on 02 May 2018 and first published on 03 May 2018


Article type: Paper
DOI: 10.1039/C8TA03131B
Citation: J. Mater. Chem. A, 2018,6, 10490-10496
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    Co-doped Ni3S2@CNT arrays anchored on graphite foam with a hierarchical conductive network for high-performance supercapacitors and hydrogen evolution electrodes

    F. Wang, Y. Zhu, W. Tian, X. Lv, H. Zhang, Z. Hu, Y. Zhang, J. Ji and W. Jiang, J. Mater. Chem. A, 2018, 6, 10490
    DOI: 10.1039/C8TA03131B

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