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Kim, Guntae
GUNS Lab
Research Interests
  • Solid Oxide Fuel Cells (SOFCs)& SOE, metal-air batteries, ceramic membranes, PEMFC

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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

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Title
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
Kim, JiyounChoi, SihyukPark, SeonhyeKim, ChangminShin, JeeyoungKim, Guntae
Keywords
Cathode; Electrochemical performance; Layered perovskite; Solid oxide fuel cell; Thermal expansion coefficient
Issue Date
201312
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
ELECTROCHIMICA ACTA, v.112, no., 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.
URI
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DOI
http://dx.doi.org/10.1016/j.electacta.2013.09.014
ISSN
0013-4686
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