文献类型：期刊文献

英文题名：Fluorine-triggered surface reconstruction of Ni3S2 electrocatalysts towards enhanced water oxidation

作者：Xu, Qiucheng[1];Chu, Mingshan[1];Liu, Miaomiao[1];Zhang, Jiahao[1];Jiang, Hao[1];Li, Chunzhong[1]

机构：[1]East China Univ Sci & Technol, Shanghai Engn Res Ctr Hierarch Nanomat, Sch Mat Sci & Engn, Key Lab Ultrafine Mat,Minist Educ, Shanghai 200237, Peoples R China

年份：2021

卷号：411

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20210409818622);WOS:【SCI-EXPANDED(收录号:WOS:000626521900003)】；

基金：This work was supported by the National Natural Science Foundation of China (21838003 and 51621002), the Shanghai Scientific and Technological Innovation Project (18JC1410600), and the Fundamental Research Funds for the Central Universities (222201718002).

语种：英文

外文关键词：Ni3S2; Electrocatalysts; Oxygen evolution reaction; Surface reconstruction; Fluorination

摘要：Developing efficient electrocatalysts to accelerate the rate-determining step of oxygen evolution reaction (OER) is a tough challenge to water electrolysis. Herein, we report a fluorinated Ni3S2 nanoarray electrocatalyst with Ni-F bonds enriched and low-crystalline ultrathin nanosheets on the surface, which are responsible for the rapid and deep electrochemical-transformation of active phase during OER process. Electrochemical characterizations indicate that the fluorinated Ni3S2 (F-Ni3S2) possesses a larger electrochemical active surface area, better conductivity and higher intrinsic OER activity (TOF) than the pristine Ni3S2. Consequently, the optimized F-Ni3S2 electrocatalyst shows a small overpotential of 239 mV at 10 mA cm(-2) with a low Tafel slope of 36 mV dec(-1), superior to most of reported Ni3S2-based electrocatalysts to date. Ex-situ structural analysis further reveals the NiF bonds can be easily activated with F loss under OER process, thus generating more highly active Ni-OOH species for accelerating rate-determining step (*O -> *OOH). This work expands fluorine chemistry applications in designing high-activity electrocatalysts for energy-conversion.