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High redox and performance stability of layered SmBa0.5Sr 0.5Co1.5Cu0.5O5+δ perovskite cathodes for intermediate-temperature solid oxide fuel cells

Author(s)
Jun, AreumShin, JeeyoungKim, Guntae
Issued Date
2013-12
DOI
10.1039/c3cp53883d
URI
https://scholarworks.unist.ac.kr/handle/201301/2679
Fulltext
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84886991907
Citation
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, v.15, no.45, pp.19906 - 19912
Abstract
Cobalt-containing cathodes often encounter problems such as high thermal expansion coefficients (TEC) and poor stability, making them unsuitable for practical use as cathode materials for intermediate-temperature solid oxide fuel cells (IT-SOFCs). This study focuses on the effects of Cu doping in the Co site of SmBa0.5Sr0.5Co2O5+δ in terms of structural characteristics, electrical properties, electrochemical performance, redox properties, and performance stability as an IT-SOFC cathode material. The TEC value of a SmBa0.5Sr0.5Co 1.5Cu0.5O5+δ (SBSCCu50) sample is 12.8 × 10-6 K-1, which is lower than that (13.7 × 10-6 K-1) of a SmBa0.5Sr0.5Co 2O5+δ (SBSCO) sample at 700 °C. SBSCCu50 showed higher redox stability at lower p(O2) and a more stable cell power output while retaining desirable electrochemical performance, as compared with SBSCO. SBSCCu50 displayed reduced TEC values and enhanced redox and performance stability, as well as satisfactory electrical properties and electrochemical performance under typical fuel cell operating conditions. The results indicate that SBSCCu50 is a promising material as a cathode for IT-SOFCs.
Publisher
ROYAL SOC CHEMISTRY
ISSN
1463-9076

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