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Issue 29, 2017
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Facile electrodeposition of cauliflower-like S-doped nickel microsphere films as highly active catalysts for electrochemical hydrogen evolution

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Abstract

The development of low-cost, earth-abundant, and high-efficiency catalysts for electrocatalytic water splitting is central to developing sustainable and clean energy. The abundant reserves of nickel sulfides are promising noble metal-free materials for the hydrogen evolution reaction (HER). In this work, a highly active cauliflower-like S-doped nickel microsphere film directly grown on a copper wire (CW) substrate (labeled as NiSx/CW) was facilely prepared via a one-step electrodeposition approach in a choline chloride/ethylene glycol (ethaline)-based deep eutectic solvent. Doping of S is found to induce an interesting structural transition from nanosheets to porous cauliflower-like microspheres, electronic structure changes at the surface, and a significant improvement in the HER catalytic performance. The as-prepared NiS0.25/CW with a Ni/S atomic ratio of 1 : 0.25 exhibits the best performance, showing a negligible onset potential (−18 mV) with a low overpotential (−54 mV at 10 mA cm−2) and small Tafel slope (54 mV dec−1) in 1.0 M KOH solution. Additionally, the NiS0.25/CW catalyst displays good durability and affords long-term electrolysis without activity degradation for 60 h. This study offers a facile synthesis route for in situ growth of the active phases on current collectors to fabricate self-supported noble-metal free HER catalysts and deep insights into the relationships among the S-doping, catalyst microstructure, and catalytic properties.

Graphical abstract: Facile electrodeposition of cauliflower-like S-doped nickel microsphere films as highly active catalysts for electrochemical hydrogen evolution

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Publication details

The article was received on 25 May 2017, accepted on 21 Jun 2017 and first published on 22 Jun 2017


Article type: Paper
DOI: 10.1039/C7TA04559J
Citation: J. Mater. Chem. A, 2017,5, 15056-15064
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    Facile electrodeposition of cauliflower-like S-doped nickel microsphere films as highly active catalysts for electrochemical hydrogen evolution

    J. R. Zeng, M. Y. Gao, Q. B. Zhang, C. Yang, X. T. Li, W. Q. Yang, Y. X. Hua, C. Y. Xu and Y. Li, J. Mater. Chem. A, 2017, 5, 15056
    DOI: 10.1039/C7TA04559J

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