Strontium doping effect on phase homogeneity and conductivity of Ba 1-xSrxCe0.6Zr0.2Y 0.2O3-δ proton-conducting oxides

Kan Rong Lee, Chung Jen Tseng, Jeng Kuei Chang, I. Ming Hung, Jing Chie Lin, Sheng Wei Lee

研究成果: 雜誌貢獻期刊論文同行評審

27 引文 斯高帕斯(Scopus)

摘要

Ba1-xSrxCe0.6Zr0.2Y 0.2O3-δ (0.0 ≤ x ≤ 1.0) proton-conducting oxides have been prepared using a citrate-EDTA complexing solegel method. In this study, the relationship between the Sr doping content and microstructure, chemical stability against CO2, and conductivity of the sintered Ba1-xSrxCe0.6Zr0.2Y 0.2O3-δ pallets are systematically investigated using XRD, SEM, micro-Raman spectroscopy, and dc two-probe measurements. All sintered Ba1-xSrxCe0.6Zr0.2Y 0.2O3-δ oxides exhibit excellent chemical stability after being exposed to the CO2 ambient at 600 °C for a long duration; nevertheless, their microstructures and conductivities are very sensitive to the Sr doping amount. The Sr incorporation is found to apparently suppress the formation of CeO2-like second phase, and enhance the grain growth in sintered oxides. Among all sintered samples, the Ba 0.8Sr0.2Ce0.6Zr0.2Y 0.2O3-δ pallet has the highest conductivity, 0.009 S/cm at 800 °C. This result can be attributed to the competition between the elimination of CeO2- or (Zr,Ce,Y)O2-like phase inhomogeneity and enhanced grain growth in sintered oxides, both of which adversely influence the ionic conductivity. This work demonstrates that Ba 1-xSrxCe0.6Zr0.2Y 0.2O3-δ would be a promising electrolyte for H +-SOFC applications if the Sr doping iswell controlled.

原文???core.languages.en_GB???
頁(從 - 到)11097-11103
頁數7
期刊International Journal of Hydrogen Energy
38
發行號25
DOIs
出版狀態已出版 - 21 8月 2013

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