Attempted preparation of La_(0.5)Ba_(0.5)MnO_(3-δ) leading to an in-situ formation of manganate nanocomposites as a cathode for proton-conducting solid oxide fuel cells  

作　　者：Rui Zhou Yanru Yin Hailu Dai Xuan Yang Yueyuan Gu Lei Bi 

机构地区：[1]School of Resources 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6期1189-1200,共12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;the support from the Hunan University Student Innovation and Entrepreneurship Training Program(Grant No.S202210555343)。

摘　　要：A La_(0.5)Ba_(0.5)MnO_(3-δ) oxide was prepared using the sol-gel technique.Instead of a pure phase,La_(0.5)Ba_(0.5)MnO_(3-δ) was discovered to be a combination of La_(0.7)Ba_(0.3)MnO_(3-δ) and BaMnO_(3).The in-situ production of La_(0.7)Ba_(0.3)MnO_(3-δ)+BaMnO_(3) nanocomposites enhanced the oxygen vacancy(Vo)formation compared to single-phase La_(0.7)Ba_(0.3)MnO_(3-δ) or BaMnO_(3),providing potential benefits as a cathode for fuel cells.Subsequently,La_(0.7)Ba_(0.3)MnO_(3-δ)+BaMnO_(3) nanocomposites were utilized as the cathode for proton-conducting solid oxide fuel cells(H-SOFCs),which significantly improved cell performance.At 700 C,H-SOFC with a La_(0.7)Ba_(0.3)MnO_(3-δ)+BaMnO_(3) nanocomposite cathode achieved the highest power density(1504 mW·cm^(-2))yet recorded for H-SOFCs with manganate cathodes.This performance was much greater than that of single-phase La_(0.7)Ba_(0.3)MnO_(3-δ)or BaMnO_(3) cathode cells.In addition,the cell demonstrated excellent working stability.First-principles calculations indicated that the La_(0.7)Ba_(0.3)MnO_(3-δ)/BaMnO_(3) interface was crucial for the enhanced cathode performance.The oxygen reduction reaction(ORR)free energy barrier was significantly lower at the La_(0.7)Ba_(0.3)MnO_(3-δ)/BaMnO_(3) interface than that at the La_(0.7)Ba_(0.3)MnO_(3-δ) or BaMnO_(3) surfaces,which explained the origin of high performance and gave a guide for the construction of novel cathodes for H-SOFCs.

关 键 词：La_(0.5)Ba_(0.5)MnO_(3-δ) NANOCOMPOSITES 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]