ZHANG Yang ¹, ZHU Liangzhu ¹, GUAN Wanbing ¹, ZHAO Hailei ^{2, 3}
(1. Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province, Ningbo Institute
of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, Zhejiang, China;
2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;3. Beijing Municipal Key Lab for Advanced Energy Materials and Technologies, Beijing 100083, China)

Abstract: Solid oxide cell (SOC) can convert chemical energy of fuel into electrical energy in fuel cell mode or convert electrical energy into chemical energy in electrolysis cell mode. It has advantages of high conversion efficiency, fuel flexibility, etc., which is very attractive for the storage and conversion of renewable energy. The electrode, where the electrochemical reaction takes place, plays a key role in SOC performance. Compared with the traditional composite electrode materials, perovskite materials have attracted extensive attention because of their simple structure, strong structural tolerance and adjustable electrochemical properties. The Mn-based A-site layered double perovskite (LnBaMn₂O_5+δ, Ln = lanthanide) has fast oxygen ion migration channel and good catalytic activity for both fuel oxidation and oxygen reduction processes and shows good structural stability under a wide oxygen partial pressure. Therefore, it is widely used as an SOC electrode. The structural characteristics and the formation reasons of the Mn-based A-site double perovskites are introduced, and the modification strategies and the progress are summarized in this work. The prospects of the Mn-based A-site double perovskites are also prospected.
Key words: solid oxide fuel cells; solid oxide electrolysis cells; A-site double perovskites; lattice structure; catalysis