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*

*Corresponding author for this work

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)11097-11103
Number of pages7
JournalInternational Journal of Hydrogen Energy
Volume38
Issue number25
DOIs
StatePublished - 21 Aug 2013

Keywords

  • Chemical stability
  • Ionic conductivity
  • Proton-conducting electrolyte
  • Solid oxide fuel cells

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