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Constructing three-dimensional porous Ni/Ni3S2 nano-interfaces for hydrogen evolution electrocatalysis under alkaline conditions

Abstract

It is still a challenging issue to design earth-abundant electrocatalysts with low cost, high activity and long-term stability and for hydrogen evolution reaction (HER) from water splitting in alkaline solutions. Here, we report a facile synthesis route of three-dimensional porous Ni/Ni3S2 nano-network on carbon cloth for efficient catalysis of HER. This unique structure exposes a high proportion of Ni/Ni3S2 hetero-interface to electrolyte, creating a synergetic effect between Ni and Ni3S2 for enhancing HER. The synergetic effect at the interface was verified by DFT calculation, which consists in an interface-assisted heterolytic splitting of H2O into OH- and H+, and the subsequent expeditious H2-forming reaction owing to the weakened binding between Ni and H induced by the neighboring Ni3S2. The resulting porous network shows a high HER activity in alkaline media, reaching 10 mA/cm2 at 95 mV with a tafel slope of 66 mV/dec, which is much smaller than that of nickel metal currently being used in industry.

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Publication details

The article was received on 10 Mar 2017, accepted on 11 May 2017 and first published on 11 May 2017


Article type: Paper
DOI: 10.1039/C7DT00878C
Citation: Dalton Trans., 2017, Accepted Manuscript
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    Constructing three-dimensional porous Ni/Ni3S2 nano-interfaces for hydrogen evolution electrocatalysis under alkaline conditions

    Y. An, B. Huang, Z. Wang, X. Long, Y. Qiu, J. Hu, D. Zhou, H. Lin and S. Yang, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT00878C

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