Development of double-perovskite compounds as cathode materials for low-temperature solid oxide fuel cells

Seonyoung Yoo; Areum Jun; Young-Wan Ju; Dorj Odkhuu; Junji Hyodo; Hu Young Jeong; Noejung Park; Jeeyoung Shin; Tatsumi Ishihara; Guntae Kim

doi:10.1002/anie.201407006

Development of double-perovskite compounds as cathode materials for low-temperature solid oxide fuel cells

Angew Chem Int Ed Engl. 2014 Nov 24;53(48):13064-7. doi: 10.1002/anie.201407006. Epub 2014 Sep 8.

Authors

Seonyoung Yoo¹, Areum Jun, Young-Wan Ju, Dorj Odkhuu, Junji Hyodo, Hu Young Jeong, Noejung Park, Jeeyoung Shin, Tatsumi Ishihara, Guntae Kim

Affiliation

¹ Department of Energy Engineering, UNIST, Ulsan, 689-798 (Korea).

PMID: 25200006
DOI: 10.1002/anie.201407006

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.

Keywords: ceramics; electrochemistry; energy conversion; fuel cells; perovskite phases.