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High redox and performance stability of layered SmBa0.5Sr0.5Co1.5Cu0.5O5+d perovskite cathodes for intermediate-temperature solid oxide fuel cells

Authors
전아름신지영김건태
Issue Date
Dec-2013
Publisher
Royal Society of Chemistry
Citation
Physical Chemistry Chemical Physics, v.15, no.45, pp 19906 - 19912
Pages
7
Journal Title
Physical Chemistry Chemical Physics
Volume
15
Number
45
Start Page
19906
End Page
19912
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/147417
DOI
10.1039/c3cp53883d
ISSN
1463-9076
1463-9084
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 SmBa0.5Sr0.5Co1.5Cu0.5O5+δ (SBSCCu50) sample is 12.8 × 10−6 K−1, which is lower than that (13.7 × 10−6 K−1) of a SmBa0.5Sr0.5Co2O5+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.
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