Interfacial Engineering of NiFeP/NiFe-LDH Heterojunction for Efficient Overall Water Splitting

查看全文 作　　者：Xuanyu [1]Long;Jiazhi [1]Meng;Jiabao [1]Gu;Lanqing [1]Ling;Qianwen [1]Li;Nan [1]Liu;Kaiwen [2]Wang;Zequan [1]Li

机构地区：[1]The School of Chemistry and Chemical Engineering,Chongqing University,Chongqing 400044,China;[2]Beijing Key Lab of Microstructure and Properties of Advanced Materials,Beijing University of Technology,Beijing 100124,China

出　　处：《Chinese Journal of Structural Chemistry》索引2022年第41卷第4期,共8页

基　　金：financial support from the National Key Research and Development Program of China(2019YFC0214402)。 摘　　要：In consideration of application prospect of non-noble metallic materials catalysts,the study of exploring more highly effective electrocatalysts has been focused on by researchers.Herein,a novel strategy is employed to construct a heterojunction consisting of metal phosphide Ni_(x)Fe_(y)P and layered double hydroxide(LDH)with graphene oxide(GO)as conductive support.By adjusting the molar ratio of Ni to Fe,a series of heterojunctions with mixed valence state Fe^(δ+)/Fe^(3+)and Ni^(δ+)/Ni^(2+)(δis likely close to 0)redox couples are achieved and strong synergistic effects towards overall water splitting performance are found.The optimized catalyst with a Ni/Fe molar ratio of 0.72:0.33,namely Ni_(0.7)Fe_(0.3)P/LDH/GO,delivers ultra-low overpotentials for hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)of 79 and 198 mV at the current density of 10 mA·cm^(-2),respectively.Furthermore,for overall water-splitting practical application,it only requires 1.526 V at 10 mA·cm^(-2)with robust stability,which is superior to most reported electrocatalysts.Experimental results demonstrate the im-proved electronic conductivity,enlarged electrochemically active area and accelerated kinetics together account for the enhanced performance.This work supplies new prospects for the promotion and application of such heterojunction electrocatalysts in overall water splitting. 关键词：overall water splitting ELECTROCATALYSIS HETEROJUNCTION PHOSPHIDE layered double hydroxide

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Interfacial Engineering of NiFeP/NiFe-LDH Heterojunction for Efficient Overall Water Splitting

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