文献类型：期刊文献

英文题名：Fe-leaching induced surface reconstruction of Ni-Fe alloy on N-doped carbon to boost oxygen evolution reaction

作者：Zhou, Yajun[1];Li, Yunheng[1];Zhang, Lingxia[2];Zhang, Linlin[2];Li, Liang[1];Tian, Jianjian[2];Wang, Min[2];Xu, Jieyu[1];Dai, Bin[3];Li, Yongsheng[1]

机构：[1]East China Univ Sci & Technol, Shanghai Engn Res Ctr Hierarch Nanomat, Lab Low Dimens Mat Chem, Key Lab Ultrafine Mat,Minist Educ,Sch Mat Sci & E, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China;[3]Shihezi Univ, Sch Chem & Chem Engn, Key Lab Green Proc Chem Engn Xinjiang Bingtuan, Shihezi 832003, Peoples R China

年份：2020

卷号：394

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20201508412840);WOS:【SCI-EXPANDED(收录号:WOS:000551901000043)】；

基金：This work was financially supported by National Natural Science Foundation of China (51672083), Program of Shanghai Academic/Technology Research Leader (18XD1401400), Basic Research Program of Shanghai (17JC1404702), Leading talents in Shanghai in 2018, the 111 project (B14018) and Research Foundation of China Postdoctoral Science (2017M621384).

语种：英文

外文关键词：Oxygen evolution reaction; FeNi3 alloy; N-doped carbon; Fe-doped Ni(OH)(2); Electrochemical activation

摘要：Understanding the dynamic transformation process of the oxygen evolution reaction (OER) catalysts is of importance for their rational design. Here we first report that Fe-leaching could induce the electrochemical activation of strongly coupled Ni-Fe alloy on N-doped carbon composites to boost the OER performance. It is demonstrated that the leaching of unstable FeOOH mixed layer from the surface of FeNi3 alloy is responsible for the surface reconstruction and exposure of more active sites. Furthermore, the N-doped carbon, FeNi3 alloy, together with the accompanying generation of Fe-doped Ni(OH)(2), synergistically promote the OER activity after fully activation. It is also verified that the high valent Ni species, pyridinic N and the metal-N species are the exact active centers and the fully activated catalyst Fe0.2Ni0.8/NC-600-a is among the best non-noble OER catalysts to date, which exhibits superior OER performance with a low overpotential (eta(20) = 290 mV) and small Tafel slope (76 mV dec(-1)). This study is helpful to understand the fundamentals of the Ni-Fe alloy catalysts and provides guidance to design advanced catalysts for water oxidation through in-situ electrochemical activation.