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Co-doped Ni3S2@CNTs Array Anchored on Graphite Foam with Hierarchical Conductive Network for High-Performance Supercapacitor and Hydrogen Evolution Electrode

Abstract

Engineering the surface structure and constructing a suitable internal conductive network is essential for the electron transfer rate and the active materials utilization efficiency of an electrode. Here, the high-porosity carbon nanotube (CNT) arrays grown on the graphite foam (GNF) is synthesized via the self-sacrificial ZnO nanorod template. Then three-dimensional conductive Co-doped Ni3S2 nanostructures (Co-Ni3S2) are coated on the CNT surface via simple hydrothermal process. The CNTs/GNF hybrid with hierarchical conductive network exhibits good electrical conductivity, while the tectorum-like Co-Ni3S2 nanosheets 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 cyclic 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).

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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, Accepted Manuscript
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    Co-doped Ni3S2@CNTs Array Anchored on Graphite Foam with Hierarchical Conductive Network for High-Performance Supercapacitor and Hydrogen Evolution Electrode

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

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