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In-situ cathodic activation of V-incorporated NixSy nanowires for enhanced hydrogen evolution

Abstract

In-situ cathodic activation (ISCA) of V-incorporated NixSy nanowires supported on nickel foam (VS/NixSy/NF) can be realized in alkaline hydrogen evolution reaction (HER) process, which provides not only the obviously enhanced activity but also the ultrahigh stability for HER. The ISCA process is continuous linear sweep voltammetry (LSV) on VS/NixSy/NF as cathodic electrode with gradually enhanced HER activity. The activated VS/NixSy/NF (A-VS/NixSy/NF) demonstrate the enhanced HER activity with overpotential of 125 mV to drive 10 mA cm-2, much lower than other samples. It may be predicted that ISCA-derived amorphous VOOH film covering on A-VS/NixSy/NF accelerates HER process, and NiOOH may protect active sites from decaying, leading to excellent activity and structural stability. However, for single metal sulfides, ISCA process of nickel or vanadium sulfides are not available, implying that the synergistic effect between Ni and V of VS/NixSy/NF may be the key to drive ISCA in alkaline HER. In addition, the ultra-high stability confirms stable active sites and nanostructure of A-VS/NixSy/NF derived from ISCA. Therefore, ISCA of V-incorporated transition metal sulfides in alkaline HER process may be a facile and promising access to efficient electrocatalysts.

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Publication details

The article was received on 22 Apr 2017, accepted on 07 Jun 2017 and first published on 08 Jun 2017


Article type: Paper
DOI: 10.1039/C7NR02867A
Citation: Nanoscale, 2017, Accepted Manuscript
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    In-situ cathodic activation of V-incorporated NixSy nanowires for enhanced hydrogen evolution

    X. Shang, K. Yan, Y. Rao, B. Dong, J. Chi, Y. Liu, X. Li, Y. Chai and C. Liu, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR02867A

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