一步电沉积制备高活性高稳定镍铁合金析氧电催化剂

摘要以镍网为基底，通过一步电沉积方法成功制备出用于碱性水电解的多孔镍铁合金析氧反应（Oxygen Evolution Reaction，OER）电极。镍铁的沉积伴随强烈的析氢，此条件下构筑出的多级孔结构成为电极用于OER反应时液相中传质与气泡释放的适宜传递通道。在析氧反应中，电流密度为10 mA·cm^-2时的过电位仅为210 mV，Tafel斜率为35 mV·dec^-1，催化活性超过商用的Ir催化剂和许多已报道的镍铁基催化剂。在60℃、30% KOH以及电流密度≥200 mA·cm^-2的工况下，电极稳定运行250 h，性能无明显衰减，表现出优异的稳定性。

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	葛升
	闵洛夫
	费洪达
	吉定豪
	王宇新

关键词：镍铁合金析氧反应碱性水电解电沉积镍网

Abstract： We propose here a facile and readily scalable method to fabricate highly efficient and durable electrocatalyst towards oxygen evolution reaction (OER). Using common nickel mesh as a substrate, Ni-Fe alloy with hierarchical pores is formed in-situ via one-step electrodeposition. The electrodeposition of Ni and Fe is accompanied by hydrogen evolution, the generated hydrogen bubble facilitate the formation of hierarchically porous structure. The particular porous structure of the Ni-Fe alloy is beneficial to OER in terms of charge transfer and gas bubble release. For this structure is formed under a very similar condition, i.e., gas evolution, it adapts well when working on OER. The Ni-Fe alloy catalyst with 15% Fe shows the best performance of an overpotential of 210 mV at 10 mA·cm^-2 and a low Tafel slop of 35 mV·dec^-1. Furthermore, the Ni-Fe alloy catalyst presents remarkable durability under industrial alkaline water electrolysis conditions for 250 h. Therefore, the hierarchically porous Ni-Fe alloy prepared via one-step electrodeposition is a promising OER catalyst in alkaline water electrolysis.

Keywords： Ni-Fe alloy； oxygen evolution reaction； alkaline water electrolysis； electrodeposition； Ni mesh

Received 2021-03-03;

Fund:人因工程国防科技重点实验室预研基金（6142222180601）。

Corresponding Authors: 王宇新,教授,E-mail:yxwang@tju.edu.cn。 Email: yxwang@tju.edu.cn

About author: 葛升(1996-),男,硕士研究生,现从事碱性水电解方面的研究。

引用本文:

葛升, 闵洛夫, 费洪达, 吉定豪, 王宇新.一步电沉积制备高活性高稳定镍铁合金析氧电催化剂[J]. 化学工业与工程, 2022,39(2): 41-49

GE Sheng, MIN Luofu, FEI Hongda, JI Dinghao, WANG Yuxin.Highly efficient and durable Ni-Fe alloy catalyst towards OER via one-step electrodeposition[J]. Chemcial Industry and Engineering, 2022,39(2): 41-49

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