title: Development of double-perovskite compounds as cathode materials for low-temperature solid oxide fuel cells.
abstract: 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)Co2O(5+δ) (NBCaCO) under both air and CO2-containing atmosphere is reported along with excellent electrochemical performance by only Ca doping into the A site of NdBaCo2O(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.
authors.affiliation: Department of Energy Engineering, UNIST, Ulsan, 689-798 (Korea).
authors.forename: Seonyoung
authors.initials: S
authors.lastname: Yoo
authors.forename: Areum
authors.initials: A
authors.lastname: Jun
authors.forename: Young-Wan
authors.initials: YW
authors.lastname: Ju
authors.forename: Dorj
authors.initials: D
authors.lastname: Odkhuu
authors.forename: Junji
authors.initials: J
authors.lastname: Hyodo
authors.forename: Hu Young
authors.initials: HY
authors.lastname: Jeong
authors.forename: Noejung
authors.initials: N
authors.lastname: Park
authors.forename: Jeeyoung
authors.initials: J
authors.lastname: Shin
authors.forename: Tatsumi
authors.initials: T
authors.lastname: Ishihara
authors.forename: Guntae
authors.initials: G
authors.lastname: Kim
keywords: ceramics; electrochemistry; energy conversion; fuel cells; perovskite phases