一步电沉积制备高活性高稳定镍铁合金析氧电催化剂  

Highly efficient and durable Ni-Fe alloy catalyst towards OER via one-step electrodeposition

作　　者：葛升 闵洛夫 费洪达 吉定豪 王宇新[1] GE Sheng;MIN Luofu;FEI Hongda;JI Dinghao;WANG Yuxin(State Key Laboratory of Chemical Engineering,Tianjin Key Laboratory of Membrane Science and Desalination Technology,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China;National Key Laboratory for Human Factors Engineering,Beijing 100094,China)

机构地区：[1]化学工程联合国家重点实验室,天津市膜科学与海水淡化技术重点实验室,天津大学化工学院,天津300350 [2]人因工程国防科技重点实验室,北京100094

出　　处：《化学工业与工程》2022年第2期41-49,共9页Chemical Industry and Engineering

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

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。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.

关 键 词：镍铁合金 析氧反应 碱性水电解 电沉积 镍网 

分 类 号：TQ151.1[化学工程—电化学工业]