A novel facile strategy to suppress Sr segregation for high-entropy stabilized La0·8Sr0·2MnO3-δ cathode

• Published in: Journal of power sources Vol. 482; p. 228959
• Main Authors: Yang, Yang, Bao, Hang, Ni, Hao, Ou, Xuemei, Wang, Shaorong, Lin, Bin, Feng, Peizhong, Ling, Yihan
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.01.2021
• Subjects: High-entropy perovskite oxide; Lattice distortion; Solid oxide fuel cell; Sr segregation; Lattice distortion; Sr segregation; Solid oxide fuel cell; High-entropy perovskite oxide
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2020.228959

Sr segregation on a perovskite oxide surface immensely affects the oxygen reduction activity and the durability of solid oxide fuel cells cathode. Herein, a facile strategy is proposed, which employs a high-entropy perovskite oxide as a cathode to suppress the Sr segregation during the long-term operation. The as-prepared high-entropy La0·8Sr0·2MnO3-δ (LSM) incorporates five components into A-site of LSM perovskite, including La, Pr, Nd, Sm and Sr (La0.2Pr0.2Nd0.2Sm0.2Sr0·2MnO3-δ, HE-LSM). The homogeneously dispersive multiple rare-earth metal species in A-site of perovskite are thermodynamically stable at high temperature. Besides, the lattice distortion of HE-LSM caused by the high dispersity of A-site cations will lead to the formation of disordered stress field around Sr, which can limit the transport rate of Sr. Further long-term stability test indicates that HE-LSM is rather stable under the operation condition, demonstrating that high-entropy perovskite oxide is a potential cathode material which can suppress the cation segregation for solid oxide fuel cell. [Display omitted] •High-entropy perovskite oxides are potential cathode materials.•LSM incorporates five components into A-site forming high-entropy oxide.•The disordered stress field around Sr can limit the transport rate of Sr.•High-entropy perovskite cathodes can suppress the Sr segregation.