W-doped FeNi_(2)S_(4)/Ni_(3)S_(2)/NF with interfacial effect as efficient bifunctional electrocatalyst for overall water splitting

作     者：Jing Jiang Hui Su Shaojia Song Weilong Liu Ning Li Yangqin Gao Lei Ge Jing Jiang;Hui Su;Shaojia Song;Weilong Liu;Ning Li;Yangqin Gao;Lei Ge

作者机构：State Key Laboratory of Heavy Oil ProcessingCollege of New Energy and MaterialsChina University of Petroleum BeijingBeijing 102249China Department of Materials Science and EngineeringCollege of New Energy and MaterialsChina University of Petroleum BeijingBeijing 102249China 

出 版 物：《Nano Research》 (纳米研究（英文版）)

年 卷 期：2023年第16卷第10期

页      面：12116-12125页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0702[理学-物理学] 

基　　金：the National Key R&D Program of China(Nos.2021YFA1501300 and 2019YFC1907602) the National Natural Science Foundation of China(Nos.51572295,21273285,and 21003157). 

主　　题：bifunctional electrocatalysts water splitting density functional theory(DFT)calculation oxygen evolution reaction(OER) 

摘      要：Given the current shortage of resources and environmental pollution,rationally designing and developing low-cost and highefficiency bifunctional electrocatalysts is an urgent and challenging task.It is widely recognized that element doping can effectively improve the electrocatalytic activity by adjusting the microstructure,morphology,and electronic structure.Therefore,this work rationally designs and prepares three-dimensional flower-like structured W-doped FeNi_(2)S_(4)/Ni_(3)S_(2)/NF heterojunctions as efficient bifunctional electrocatalysts for overall water splitting.In 1 M KOH,the prepared W-FeNi_(2)S_(4)/Ni_(3)S_(2)/NF electrocatalyst can effectively drive both hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)processes,and only needs overpotentials of 93 and 210 mV to reach current densities of 10 and 50 mA·cm^(−2).In the double electrode cell composed by WFeNi_(2)S_(4)/Ni_(3)S_(2)/NF electrocatalyst,a low cell voltage of 1.52 V was required to reach a current density of 10 mA·cm^(−2),and 91.6%of this value was preserved after 24 h electrolysis operation.The performance of FeNi_(2)S_(4)/Ni_(3)S_(2)/NF electrocatalyst is superior to most of the current bifunctional electrocatalytic materials.Density functional theory(DFT)theoretical calculations also revealed a more intense electron transfer process that can be facilitated by constructing FeNi_(2)S_(4)and Ni_(3)S_(2)/NF interface,which may be the main reason for the archived excellent electrochemical performance.