Entropy engineering design of high-performing lithiated oxide cathodes for proton-conducting solid oxide fuel cells  

作　　者：Yufeng Li Yangsen Xu Yanru Yin Hailu Dai Yueyuan Gu Lei Bi 

机构地区：[1]School of Resource Environment and Safety Engineering,University of South China,Hengyang 421001,China [2]School of Materials Science and Engineering,Yancheng Institute of Technology,Yancheng 224051,China

出　　处：《Journal of Advanced Ceramics》2023年第11期2017-2031,共15页先进陶瓷（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.52272216 and 51972183);the Hundred Youth Talents Program of Hunan,and the Startup Funding for Talents at University of South China.

摘　　要：A new medium entropy material LiCo_(0.25)Fe_(0.25)Mn_(0.2)5Ni_(0.2)5O_(2)(LCFMN)is proposed as a cathode for proton-conducting solid oxide fuel cells(H-SOFCs).Unlike traditional LiXO_(2)(X=Co,Fe,Mn,Ni)lithiated oxides,which have issues like phase impurity,poor chemical compatibility,or poor fuel cell performance,the new LCFMN material mitigates these problems,allowing for the successful preparation of pure phase LCFMN with good chemical and thermal compatibility to the electrolyte.Furthermore,the entropy engineering strategy is found to weaken the covalence bond between the metal and oxygen in the LCFMN lattice,favoring the creation of oxygen vacancies and increasing cathode activity.As a result,the H-SOFC with the LCFMN cathode achieves an unprecedented fuel cell output of 1803 mW·cm^(−2)at 700℃,the highest ever reported for H-SOFCs with lithiated oxide cathodes.In addition to high fuel cell performance,the LCFMN cathode permits stable fuel cell operation for more than 450 h without visible degradation,demonstrating that LCFMN is a suitable cathode choice for H-SOFCs that combining high performance and good stability.

关 键 词：entropy design LiCo_(0.25)Fe_(0.25)Mn_(0.25)Ni_(0.25)O_(2)(LCFMN) CATHODE proton conductor solid oxide fuel cells(SOFCs) 

分 类 号：TM911.4[电气工程—电力电子与电力传动] TQ174.1[化学工程—陶瓷工业]