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Development of Double‐Perovskite Compounds as Cathode Materials for Low‐Temperature Solid Oxide Fuel Cells
Author(s) -
Yoo Seonyoung,
Jun Areum,
Ju YoungWan,
Odkhuu Dorj,
Hyodo Junji,
Jeong Hu Young,
Park Noejung,
Shin Jeeyoung,
Ishihara Tatsumi,
Kim Guntae
Publication year - 2014
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201407006
Subject(s) - coulometry , electrochemistry , electrolyte , oxygen , cathode , chemistry , perovskite (structure) , inorganic chemistry , oxide , redox , titration , reducing atmosphere , density functional theory , chemical engineering , electrode , organic chemistry , computational chemistry , engineering
A class of double‐perovskite compounds display fast oxygen ion diffusion and high catalytic activity toward oxygen reduction while maintaining excellent compatibility with the electrolyte. The astoundingly extended stability of NdBa 1− x Ca x Co 2 O 5+ δ (NBCaCO) under both air and CO 2 ‐containing atmosphere is reported along with excellent electrochemical performance by only Ca doping into the A site of NdBaCo 2 O 5+ δ (NBCO). The enhanced stability can be ascribed to both the increased electron affinity of mobile oxygen species with Ca, determined through density functional theory calculations and the increased redox stability from the coulometric titration.