Introducing sulfur to nickel-iron selenide for high-efficiency alkaline seawater electrolysis  

作　　者：Xuanwa Chen Yanhui Yu Xingqi Han Huan Wang Yingjie Hua Daoxiong Wu Peilin Deng Juanxiu Xiao Xinlong Tian Jing Li 

机构地区：[1]School of Marine Science and Engineering,Hainan Provincial Key Lab of Fine Chemistry,School of Chemistry and Chemical Engineering,Hainan University,Haikou 570228,China [2]Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education),College of Chemistry,Nankai University,Tianjin 300071,China [3]Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province,School of Chemistry and Chemical Engineering,Hainan Normal University,Haikou 571158,China

出　　处：《Science China Chemistry》2024年第8期2747-2754,共8页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China(22202053,22109035,52274297);the Startup Research Foundation of Hainan University(KYQD(ZR)-20008,20083,20084,21125,23170);the specific research fund of the Innovation Platform for Academicians of Hainan Province(YSPTZX202315);the Research Fund Program of Guangdong Provincial Key Laboratory of Fuel Cell Technology(FC202307);the Open Fund Project of Key Laboratory of Electrochemical Energy Storage and Energy Conversion in Hainan Province of China(KFKT2023002);the Innovative Research Projects for Graduate Students of Hainan Province(Qhyb2023-15)。

摘　　要：Seawater electrolysis is an effective way to obtain hydrogen(H_(2))in a sustainable manner.However,the lack of electrocatalysts with high activity,stability,and selectivity for oxygen evolution reaction(OER)severely hinders the development of seawater electrolysis technology.Herein,sulfur-doped nickel-iron selenide nanosheets(S-NiFeSe_(2))were prepared by an ion-exchange strategy and served as highly active OER electrocatalyst for alkaline seawater electrolysis.The overpotential is 367 m V,and it can run stably for over 50 h at 100 m A cm^(-2).Excitingly,the S-NiFeSe_(2)||Pt/C pair exhibits cell voltage of 1.54 V at 10 m A cm^(-2)under alkaline seawater conditions,which can run smoothly for 100 h without decay,and the efficiency of electricity-tohydrogen(ETH)energy conversion reaches more than 80%.Such electrode,with abundant accessible reactive sites and good corrosion resistance,is a good candidate for seawater electrolysis.Moreover,density functional theory calculations reveal that the surface sulfur atoms can activate the adjacent Ni sites and decrease the free energy changes of the associated intermediates at the adjacent Ni sites for OER,and the step of~*OH→~*O is the potential rate-limiting step.In this work,the true reactive site in nickel-iron selenides is the Ni sites,but not the Fe sites as commonly believed.

关 键 词：S-doping nickel-iron selenide ELECTROCATALYSTS oxygen evolution reaction alkaline seawater electrolysis 

分 类 号：TQ116.21[化学工程—无机化工] TQ426