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Effect of Mn on the electrochemical properties of a layered perovskite NdBa0.5Sr0.5Co2-xMnxO5+delta (x=0, 0.25, and 0.5) for intermediate-temperature solid oxide fuel cells

Author(s)
Kim, JiyounChoi, SihyukPark, SeonhyeKim, ChangminShin, JeeyoungKim, Guntae
Issued Date
2013-12
DOI
10.1016/j.electacta.2013.09.014
URI
https://scholarworks.unist.ac.kr/handle/201301/4236
Fulltext
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84885339822
Citation
ELECTROCHIMICA ACTA, v.112, pp.712 - 718
Abstract
NdBa0.5Sr0.5Co2-xMnxO5+δ (x=0, 0.25, and 0.5) specimens are synthesized and investigated as cathode materials for intermediate-temperature solid oxide fuel cells (IT-SOFCs). The interaction between two different transition metals, Mn and Co, may affect the electronic conducting properties and electrochemical performance. The substitution of Mn for Co lowers the thermal expansion coefficient (TEC) of Co-based materials by suppression of the spin state transition of Co3+ which might consequently improve the mechanical compatibility with the electrolyte. The electrochemical performance, however, could be slightly degraded by trapping of the effective mobile charge with increasing Mn content. Such a substitution of Co by Mn would provide a tradeoff relationship between TEC and electrochemical performance in IT-SOFCs. In this paper, the tradeoff between electrochemical and thermal expansion is explored.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
ISSN
0013-4686

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