Proton-conducting Ba1-xKxCe0.6Zr 0.2Y0.2O3-δ oxides synthesized by sol-gel combined with composition-exchange method

Kan Rong Lee, Yen Chun Chiang, I. Ming Hung, Chung Jen Tseng, Jeng-Kuei Chang, Sheng Wei Lee*

*Corresponding author for this work

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

This study reports the synthesis of proton-conducting Ba 1-xKxCe0.6Zr0.2Y0.2O 3-δ (x=0.025-0.075) ceramics by using a combination of citrate-EDTA complexing sol-gel process and the composition-exchange method. Compared to the sintered oxides of similar composition prepared from conventional sol-gel powders, Ba1-xKxCe 0.6Zr0.2Y0.2O3-δ oxides synthesized by sol-gel combined with the composition-exchange method are found to exhibit improved sinterability, higher conductivity, more homogeneous phase, and excellent chemical stability against CO2. Among all sintered oxides in this study, the Ba0.925K0.075Ce 0.6Zr0.2Y0.2O3-δ pellet fabricated by this new method has the highest conductivity, 0.0094 S/cm at 800 C, which is higher than those pressed from conventional sol-gel powders in the K doping range of 0-15%. Based on the experimental results, we discuss the mechanism for improvement in these properties in terms of calcined particle characteristics. This work demonstrates that Ba1-xK xCe0.6Zr0.2Y0.2O 3-δ oxides synthesized by sol-gel combined with the composition-exchange method would be a promising electrolyte for H +-SOFC applications. More importantly, this new fabrication approach may be applied to other similar material systems, such as Sr-doped Ba(Ce,Zr)O3 ceramics.

Original languageEnglish
Pages (from-to)1865-1872
Number of pages8
JournalCeramics International
Volume40
Issue number1 PART B
DOIs
StatePublished - 1 Jan 2014

Keywords

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

Fingerprint Dive into the research topics of 'Proton-conducting Ba<sub>1-x</sub>K<sub>x</sub>Ce<sub>0.6</sub>Zr <sub>0.2</sub>Y<sub>0.2</sub>O<sub>3-δ</sub> oxides synthesized by sol-gel combined with composition-exchange method'. Together they form a unique fingerprint.

Cite this