A robust fluorine-containing ceramic cathode for direct CO_(2) electrolysis in solid oxide electrolysis cells

作     者：Shaowei Zhang Chengyue Yang Yunan Jiang Ping Li Changrong Xia Shaowei Zhang;Chengyue Yang;Yunan Jiang;Ping Li;Changrong Xia

作者机构：CAS Key Laboratory of Materials for Energy ConversionDepartment of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefei 2300026AnhuiChina School of Energy and Power EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016JiangsuChina Energy Materials CenterAnhui Estone Materials Technology Co.LtdHefei 230088AnhuiChina 

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

年 卷 期：2023年第77卷第2期

页      面：300-309,I0008页

核心收录：

学科分类：081704[工学-应用化学] 0808[工学-电气工程] 08[工学] 0817[工学-化学工程与技术] 

基　　金：supported by the National Key R&D Program of China(2021YFB4001401) the National Natural Science Foundation of China(51972298) 

主　　题：Solid oxide electrolysis cell CO_(2)electrolysis Ceramic cathode F doping Strontium-doped lanthanum ferrite 

摘      要：Stro ntium-doped lanthanum ferrite(LSF)is a potential ceramic cathode for direct CO_(2) electrolysis in solid oxide electrolysis cells(SOECs),but its application is limited by insufficient catalytic activity and stability in CO_(2)-containing ***,a novel strategy is proposed to enhance the electrolytic performance as well as chemical stability,achieved by doping F into the O-site of the perovskite *** F does not change the phase structure but reduces the cell volume and improves the chemical stability in a CO_(2)-rich ***,F doping favors oxygen vacancy formation,increases oxygen vacancy concentration,and enhances the CO_(2) adsorption ***,doping with F greatly improves the kinetics of the CO_(2) reduction *** example,kchem increases by 78%from3.49×10^(-4) cm s^(-1) to 6.24×10^(-4) cm s^(-1),and Dchem doubles from 4.68×10^(-5) cm^(2) s^(-1) to 9.45×10^(-5)cm^(2) s^(-1).Consequently,doping F significantly increases the electrochemical performance,such as reducing R_(p) by 52.2%from 0.226Ωcm^(2) to 0.108Ωcm^(2) at 800℃.As a result,the single cell with the Fcontaining cathode exhibits an extremely high current density of 2.58 A cm^(-2) at 800℃and 1.5 V,as well as excellent durability over 200 h for direct CO_(2) electrolysis in SOECs.