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Stability of Composite Cathode Consisting of Doped Bismuth Oxide (Y_(0.25)Bi_(0.75)O_(1.5)) and Conducting Perovskite La_(1-X)Sr_xMeO_(3-δ) (Me=Mn, Cu)

Fung, Kuan-Zong and Tsai, Shu-Yi and Chang, Yun-Jie and Jung, WooChul and Haile, Sossina M. (2013) Stability of Composite Cathode Consisting of Doped Bismuth Oxide (Y_(0.25)Bi_(0.75)O_(1.5)) and Conducting Perovskite La_(1-X)Sr_xMeO_(3-δ) (Me=Mn, Cu). ECS Transactions, 57 (1). pp. 1917-1923. ISSN 1938-6737. https://resolver.caltech.edu/CaltechAUTHORS:20180914-100810886

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Abstract

The mixed conducting cathodes for solid oxide fuel cells usually consist of a mixture of oxygen ion conductor and a conducting perovskite oxide. Bismuth oxide based materials are known to exhibit high ionic conductivity. Among them, Y_(0.25)Bi_(0.75)O_(1.5) (25YSB) is a typical example. On the other hand, La_(0.8)Sr_(0.2)MnO_(3-δ) (20LSM) and La_(0.75)Sr_(0.25)CuO_(3-δ) (25LSCu) are well known cathodes for SOFC applications. In this study, the phase stability of composite cathode consisting of 25LSCu or 20LSM and 25YSB mixed powders was examined. No additional phase other than LSM and YSB was observed at temperatures as high as 1000 °C for 8h. However, 25LSCu tends to react with 25YSB and additional phases belonging to La_(0.3)Bi_(0.7)O_(1.5), La)2CuO)4, CuO and Bi)2Sr)2CuO)6 appeared after heat treatment at 800 °C for 20h. The conductivity of 20LSM-25YSB composite electrode increases with increasing volume fraction of 20LSM. The thermal expansion of 20LSM-25YSB composite electrode was also measured as a function of 25YSB content. Based on these results, 20LSM+25YSB is believed to be the desired composite cathode for SOFC application.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1149/05701.1917ecstDOIArticle
ORCID:
AuthorORCID
Haile, Sossina M.0000-0002-5293-6252
Alternate Title:Stability of Composite Cathode Consisting of Doped Bismuth Oxide (Y0.25Bi0.75O1.5) and Conducting Perovskite La1-XSrxMeO3-δ (Me=Mn, Cu)
Additional Information:© 2013 ECS - The Electrochemical Society. This work is financially supported by National Science Council (NSC), Taiwan, under the Grant No. NSC 102-3113-P-008-001.
Funders:
Funding AgencyGrant Number
National Science Council (Taipei)NSC 102-3113-P-008-001
Issue or Number:1
Record Number:CaltechAUTHORS:20180914-100810886
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180914-100810886
Official Citation:Kuan-Zong Fung, Shu-Yi Tsai, Yun-Jie Chang, WooChul Jung, and Sossina M. Haile Stability of Composite Cathode Consisting of Doped Bismuth Oxide (Y0.25Bi0.75O1.5) and Conducting Perovskite La1-XSrxMeO3-δ (Me=Mn, Cu) ECS Trans. 2013 57(1): 1917-1923; doi:10.1149/05701.1917ecst
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89634
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:14 Sep 2018 21:43
Last Modified:03 Oct 2019 20:17

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