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

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Abstract

It is still a challenging issue to design earth-abundant electrocatalysts with low cost, high activity and long-term stability for the hydrogen evolution reaction (HER) based on water splitting in alkaline solutions. Here, we report a facile synthetic route for a three-dimensional, porous Ni/Ni3S2 nano-network on carbon cloth for the efficient catalysis of HER. This unique structure exposes a high proportion of Ni/Ni3S2 hetero-interfaces to the electrolyte, creating a synergetic effect between Ni and Ni3S2 that enhances HER. The synergetic effect at the interface was verified by DFT calculation and involves the interface-assisted heterolytic splitting of H2O into OH and H+ and the subsequent expeditious H2-forming reaction caused by weakened binding between Ni and H induced by the neighboring Ni3S2. The resulting porous network shows high HER activity in alkaline media, reaching 10 mA cm−2 at 95 mV with a Tafel slope of 66 mV dec−1. This value is much smaller than that of nickel metal, which is currently used in industry.

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

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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, Advance Article
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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, Advance Article , DOI: 10.1039/C7DT00878C

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