文献类型：期刊文献

英文题名：Fluorination-enabled Reconstruction of NiFe Electrocatalysts for Efficient Water Oxidation

作者：Xu, Qiucheng[1];Jiang, Hao[1,2];Duan, Xuezhi[2];Jiang, Zheng[3];Hu, Yanjie[1];Boettcher, Shannon W.[4];Zhang, Weiyu[5];Guo, Shaojun[5];Li, Chunzhong[1,2]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Ultrafine Mat, Minist Educ, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Shanghai Engn Res Ctr Hierarch Nanomat, Sch Chem Engn, Shanghai 200237, Peoples R China;[3]Chinese Acad Sci, Shanghai Adv Res Inst, Zhangjiang Natl Lab, Shanghai Synchrotron Radiat Facil, Shanghai 201210, Peoples R China;[4]Univ Oregon, Dept Chem & Biochem, Eugene, OR 97403 USA;[5]Peking Univ, Sch Mat Sci & Engn, Beijing 100871, Peoples R China

年份：2021

卷号：21

期号：1

起止页码：492

外文期刊名：NANO LETTERS

收录：;EI(收录号：20205109656942);WOS:【SCI-EXPANDED(收录号:WOS:000611082000066)】；

基金：This work was supported by the National Natural Science Foundation of China (21838003, 51621002, and 52025133), the Shanghai Scientific and Technological Innovation Project (18JC1410600), the National Program for Support of Top-Notch Young Professionals, the Tencent Foundation through the XPLORER PRIZE, the Fund of the State Key Laboratory of Solidification Processing in NWPU (SKLSP202004), and the Fundamental Research Funds for the Central Universities (222201718002). Work at the University of Oregon was funded by the U.S. National Science Foundation, award number CHE-1955106.

语种：英文

外文关键词：electrocatalysts; oxygen evolution reaction; fluorination; nanosheets; water splitting

摘要：Developing low-cost and efficient electrocatalysts to accelerate oxygen evolution reaction (OER) kinetics is vital for water and carbon-dioxide electrolyzers. The fastest-known water oxidation catalyst, Ni(Fe)OxHy, usually produced through an electrochemical reconstruction of precatalysts under alkaline condition, has received substantial attention. However, the reconstruction in the reported catalysts usually leads to a limited active layer and poorly controlled Fe-activated sites. Here, we demonstrate a new electrochemistry-driven F-enabled surface-reconstruction strategy for converting the ultrathin NiFeOxFy nanosheets into an Fe-enriched Ni(Fe)OxHy phase. The activated electrocatalyst shows a low OER overpotential of 218 +/- 5 mV at 10 mA cm(-2) and a low Tafel slope of 31 +/- 4 mV dec(-1), which is among the best for NiFe-based OER electrocatalysts. Such superior performance is caused by the effective formation of the Fe-enriched Ni(Fe)OxHy active-phase that is identified by operando Raman spectroscopy and the substantially improved surface wettability and gas-bubble-releasing behavior.