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Activation of Defective Nickel Molybdate Nanowires for Enhanced Alkaline Electrochemical Hydrogen Evolution

Abstract

Designing highly-efficient and cost-effective electrocatalysts for the hydrogen evolution reaction (HER) has been pursued in alkaline solution, which is more complex and sluggish than the acidic one. Herein, we report a controllable N-doping strategy to synthesize a series of N-doped porous metallic NiMoO4 nanowires with concomitant oxygen vacancy defects (N-Vo-NiMoO4 NWs) for promoting the alkaline HER ability and durability. Both experimental and theoretical results demosntrate that the doped-N at NiO6 octahedral sites and the abundant oxygen vacancy defects confined in N-Vo-NiMoO4 NWs with modified electronic arrangement could enhance the metallic conductivity, affect the surface areas, and lower the adsorption energy of hydrogen, resulting in an increased HER property. However, the excess doped-N leads to an opposite effect due to the reduced valence state of Ni centers. Therefore, alkaline HER ability of N-Vo-NiMoO4 NWs exhibits a volcano-like trend vs. the nitrogen content, with N3-Vo-NiMoO4 NWs being the best one. As a result, the N3-Vo-NiMoO4 NWs show a nearly zero onset overpontential, an overpotential of 55 mV at 10 mA cm-2, and a Tafel slope of only 38 mV dec-1 in 1.0 M KOH, which are superior to those state-of-the-art platinum-free electrocatalysts.

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Publication details

The article was received on 16 Jul 2018, accepted on 10 Aug 2018 and first published on 10 Aug 2018


Article type: Paper
DOI: 10.1039/C8NR05723K
Citation: Nanoscale, 2018, Accepted Manuscript
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    Activation of Defective Nickel Molybdate Nanowires for Enhanced Alkaline Electrochemical Hydrogen Evolution

    L. An, Y. Zhang, R. Wang, H. Liu, D. Gao, Y. Zhao, F. Cheng and P. Xi, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR05723K

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