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Self-Supported Nickel-Cobalt Nanowires as Highly Efficient and Stable Electrocatalysts for Overall Water Splitting

Abstract

The development and design of highly active and stable electrocatalysts based on cheap and earth-abundant materials are critically important to enable water splitting as a desirable renewable energy source. Herein, we fulfill the significant electrochemical water splitting enhancement in both electrocatalytic activity and durability by constructing the self-supported nickel-cobalt nanowire catalysts with abundant oxygen vacancies. Specifically, the rich oxygen vacancies can largely promote the oxygen evolution reaction (OER) activity of optimal Ni1Co1O2 NWs with a relatively low overpotential of 248 mV to drive the current density of 10 mA cm-2. More significantly, after the phosphorization of Ni1Co1O2 NWs, the resultant Ni1Co1P NWs can also display excellent electrocatalytic hydrogen evolution reaction (HER) performances with the overpotential of only 101 mV to achieve the current density of 10 mA cm-2. Furthermore, benefitting from the unique 1D nanowire structure, the synergistic effects, as well as the optimal Gibbs free energy for hydrogen evolution evolved from the phosphorization, the Ni1Co1O2 NWs // Ni1Co1P NWs couple is thus highly active and stable for overall water electrolysis with a low voltage of 1.58 V at 10 mA cm−2, showing extraordinary promise for practical overall water splitting electrolysis.

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Publication details

The article was received on 30 Jun 2018, accepted on 11 Sep 2018 and first published on 11 Sep 2018


Article type: Paper
DOI: 10.1039/C8NR05279D
Citation: Nanoscale, 2018, Accepted Manuscript
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    Self-Supported Nickel-Cobalt Nanowires as Highly Efficient and Stable Electrocatalysts for Overall Water Splitting

    H. Xu, J. Wei, M. Zhang, J. Wang, Y. Shiraishi, L. Tian and Y. Du, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR05279D

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