Electrochemical oxygen evolution reaction efficiently boosted by selective fluoridation of FeNi3 alloy/oxide hybrid

作     者：Meng Zha Chengang Pei Quan Wang Guangzhi Hu Ligang Feng Meng Zha;Chengang Pei;Quan Wang;Guangzhi Hu;Ligang Feng

作者机构：Key Laboratory of Medicinal Chemistry for Natural Resource(Yunnan University)Ministry of EducationSchool of Chemical Science and EngineeringYunnan UniversityKunming 650091YunnanChina School of Chemistry and Chemical EngineeringYangzhou UniversityYangzhou 225002JiangsuChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2020年第29卷第8期

页      面：166-171,I0006页

核心收录：

学科分类：081702[工学-化学工艺] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China (21603041 and 21972124) A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institution the support of Six Talent Peaks Project of Jiangsu Province (XCL-070-2018) 

主　　题：Oxygen evolution reaction Water splitting FeNi Metal oxide Metal fluoride 

摘      要：Performance boosting of hybrid metal oxide and metal alloy catalyst is crucial to the water electrolysis for hydrogen generation. Herein, a novel concept of selective fluoridation of metal alloy/oxide hybrid is proposed to boost their catalytic performance for the oxygen evolution reaction(OER). A well-recognized OER catalyst system of FeNi3 alloy/oxide embedded in nitrogen-doped porous nanofibers(FeNiO/NCF) is employed as a proof of concept, and it is selectively fluoridated by transforming the metal oxide to metal fluoride(FeNiF/NCF). The crystal structure and surface chemical state transformation are well supported by the spectroscopic analysis and the improved electrochemical performance for OER can be well correlated to the phase and structure change. Specifically, FeNiF/NCF can drive the benchmark current density of 10 mA cm-2 at 260 mV with a Tafel slope of 67 mV dec-1, about 70 mV less than that of FeNiO/*** catalytic kinetics, rapid charge transfer ability, high catalytic efficiency and stability are also probed by electrochemical analysis. The high surface area and roughness are found mainly generated via the high-temperature annealing for the metal alloy/metal oxide formation, and the low-temperature fluoridation process intrinsically contributes to the active structure formation. It is an efficient and universal approach to increase the catalytic performance of metal alloy/oxide for energy-relevant catalytic reactions.