Interfacial Phenomena of Alkalimetal Carbonate on Sm-Doped Ceria for Composite Electrolytes

High temperature Raman spectroscopy of Sm doped CeO2/carbonate composite was measured in order to discuss the interaction between carbonate ion and solid oxide electrolyte at an interface in Sm doped CeO2/carbonate LT-SOFC. In Raman spectra with temperature of carbonate breathing mode of NK in initi...

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Bibliographic Details
Published in:ECS transactions 2014-08, Vol.64 (4), p.45-56
Main Authors: Mizuhata, Minoru, Takeda, Kaori, Maki, Hideshi
Format: Article
Language:English
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Summary:High temperature Raman spectroscopy of Sm doped CeO2/carbonate composite was measured in order to discuss the interaction between carbonate ion and solid oxide electrolyte at an interface in Sm doped CeO2/carbonate LT-SOFC. In Raman spectra with temperature of carbonate breathing mode of NK in initial heating process, whereas separated ν1(CO32-) bands assigned to Na2CO3 and K2CO3 are observed clearly at lower temperature, unifying of these bands was observed due to solid state migration of carbonates at temperature lower than eutectic point (983 K). Degree of migration is affected by apparent average thickness (AAT) and Sm amount in oxide. Solid state diffusion at temperature lower than eutectic point of carbonate mixture is assisted by coexistence of solid oxides.
ISSN:1938-5862
1938-6737
DOI:10.1149/06404.0045ecst