Controlled high-density interface engineering of Fe_(3)O_(4)-FeS nanoarray for efficient hydrogen evolution

作     者：Min Yang Wen-Hui Hu Meng-Xuan Li Yu-Ning Cao Bin Dong Yu Ma Hui-Ying Zhao Feng-Ge Wang Jier Huang Yong-Ming Chai Min Yang;Wen-Hui Hu;Meng-Xuan Li;Yu-Ning Cao;Bin Dong;Yu Ma;Hui-Ying Zhao;Feng-Ge Wang;Jier Huang;Yong-Ming Chai

作者机构：State Key Laboratory of Heavy Oil ProcessingCollege of Chemical EngineeringChina University of Petroleum(East China)Qingdao 266580ShandongChina Department of ChemistryMarquette UniversityMilwaukeeWI 53201United States X-ray Science DivisionArgonne National LaboratoryArgonneIL 60349United States 

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

年 卷 期：2022年第31卷第5期

页      面：96-103页

核心收录：

学科分类：081705[工学-工业催化] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0817[工学-化学工程与技术] 080501[工学-材料物理与化学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：financially supported by National Natural Science Foundation of China (52174283) the Qingdao Science and Technology Benefiting People Special Project (20-3-4-8-nsh) the Fundamental Research Funds for the Central Universities(20CX02212A) the Development Fund of State Key Laboratory of Heavy Oil Processing and the Postgraduate Innovation Project of China University of Petroleum (YCX2020042) 

主　　题：High-density interfaces Double sites Chemical oxidation Hydrogen evolution reaction 

摘      要：The rational design of double active sites system is vital for constructing high-efficiency iron sulfides electrocatalysts towards hydrogen evolution reaction(HER) in alkaline media. However, it remains a challenge to controllably create the high-density interface of double sites for optimal synergistic ***, we reported a simple chemical oxidation-induced surface reconfiguration strategy to obtain the interface-rich Fe_(3)O_(4)-FeS nanoarray supported on iron foam(Fe_(3)O_(4)-FeS/IF) using FeS nanosheets as precursors. The abundant Fe_(3)O_(4)-FeS interfaces could improve the dispersion of active sites and facilitate the electron transfer, leading to enhanced hydrogen evolution efficiency. And meanwhile, by altering the oxidation temperature, the content of S and O could be effectively controlled, further achieving the ratio optimization of Fe_(3)O_(4)to FeS. Synchrotron-based X-ray absorption near-edge structure, X-ray photoelectron spectroscopy and ultraviolet photoemission spectroscopy consistently confirm the changes of electronic structure and d-band center of Fe_(3)O_(4)-FeS after chemical oxidation. Consequently, Fe_(3)O_(4)-FeS/IF exhibits excellent alkaline HER activity with a low overpotential of 120.8 mV to reach 20 mA cm^(-2),and remains stable ranging from 10, 20 to 50 mA cm^(-2) for each 20 h, respectively. Therefore, the facile and controllable chemical oxidation may be an effective strategy for designing high-density interfaces of transition metal-based sulfides towards alkaline HER.