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论文类型：期刊论文

发表时间：2020-06-01

发表刊物：SUSTAINABLE ENERGY & FUELS

收录刊物：SCIE

卷号：4

期号：6

页面范围：2792-2799

ISSN号：2398-4902

摘要：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.