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Trace tungsten and iron-doped nickel hydroxide nanosheets for an efficient oxygen evolution reaction

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Abstract

FexNi1−x(O)OH has been proven to be an efficient, earth-abundant and nonprecious catalyst for the oxygen evolution reaction (OER). However, the weak binding of oxygenated intermediates and the exposure of a few active sites on NiFe hydroxides considerably hinder their catalytic activity. Based on the fact that the W6+ ions possess higher valency. and similar ionic radius with respect to the Fe2+, Fe3+, and Ni2+ ions, which can modulate the (NiO6) crystal structure and enhance the interaction of block electrons, we have tried to introduce a trace amount of W6+ into FexNi1−x(O)OH. To our surprise, the target product Fe0.03W0.03–Ni LDHB exhibited the lowest overpotential of 205(±3) mV at 10 mA cm−2, Tafel slope of 60 mV dec−1, and no obvious decrease in the electrocatalytic activity after more than 50 hour operation or 3000 cyclic voltammetry cycles. X-ray diffraction, Raman spectroscopy, UV-Vis spectroscopy, X-ray photoelectron spectroscopy and electrochemical studies revealed a synergistic interplay among tungsten, iron and nickel for producing a favorable local coordination environment and electronic structure, which enhanced the OER performance.

Graphical abstract: Trace tungsten and iron-doped nickel hydroxide nanosheets for an efficient oxygen evolution reaction

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Article information


Submitted
06 Feb 2020
Accepted
15 Mar 2020
First published
16 Mar 2020

Sustainable Energy Fuels, 2020, Advance Article
Article type
Paper

Trace tungsten and iron-doped nickel hydroxide nanosheets for an efficient oxygen evolution reaction

C. Li, P. Tian, H. Pang, W. Gong, J. Ye and G. Ning, Sustainable Energy Fuels, 2020, Advance Article , DOI: 10.1039/D0SE00205D

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