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Ni(OH)2-CoS2 hybrid nanowire array: a superior non-noble-metal catalyst toward the hydrogen evolution reaction in alkaline media

Abstract

The rising H2 economy urgently demands active, durable and cost-effective catalysts for electrochemical hydrogen evolution reaction (HER). However, improving HER performance of electrocatalysts in alkaline media is still challenging. Herein, we report the development of nickel hydroxide-cobalt disulfide nanowire array on carbon cloth (Ni(OH)2-CoS2/CC) as a hybrid catalyst to significantly enhance the HER activity in alkaline solutions. Benefitting from heterogeneous interfaces in this 3D hybrid electrocatalyst, Ni(OH)2-CoS2/CC shows superior HER activity with only 99 mV overpotential to drive current density of 20 mA cm–2 in 1.0 M KOH, which is 100 mV less than that of CoS2/CC. Moreover, Ni(OH)2-CoS2/CC exhibits long-term electrochemical durability with the maintenance of its catalytic activity for 30 h. Density functional theory calculations are performed to gain further insight on the effect of Ni(OH)2-CoS2 interfaces, revealing that Ni(OH)2 plays a key role in water dissociation to hydrogen intermediates and CoS2 facilitates adsorption of hydrogen intermediates and H2 generation. This work not only develops a promising electrocatalyst for alkaline HER, but also paves a way to enhance alkaline HER activity of CoS2 via the interface engineering strategy.

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Publication details

The article was received on 14 Aug 2017, accepted on 09 Oct 2017 and first published on 11 Oct 2017


Article type: Communication
DOI: 10.1039/C7NR06001G
Citation: Nanoscale, 2017, Accepted Manuscript
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    Ni(OH)2-CoS2 hybrid nanowire array: a superior non-noble-metal catalyst toward the hydrogen evolution reaction in alkaline media

    L. Chen, J. Zhang, X. Ren, R. Ge, W. Teng, X. Sun and X. Li, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR06001G

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