BaZr0.2Ce0.8-xYxO3-δ solid oxide fuel cell electrolyte synthesized by sol-gel combined with composition-exchange method

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

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

This study reports the synthesis of proton-conducting BaZr 0.2Ce0.8-xYxO3-δ (x = 0-0.4) oxides by using a combination of citrate-EDTA complexing sol-gel process and composition-exchange method. Compared to those oxides prepared from conventional sol-gel powders, the sintered BaZr0.2Ce0.8-xY xO3-δ pellets synthesized by sol-gel combined with composition-exchange method are found to exhibit improved sinterability, a higher relative density, higher conduction, and excellent thermodynamic stability against CO2. Moreover, the Pt/electrolyte/Pt single cell using such a BaZr0.2Ce0.6Y0.2O 3-δ electrolyte shows an obviously higher maximum powder density in the hydrogen-air fuel cell experiments. Based on the experimental results, we discuss the improvement mechanism in terms of calcined particle characteristics. This work demonstrates that the BaZr0.2Ce 0.8-xYxO3-δ oxides synthesized by sol-gel combined with composition-exchange method would be a promising electrolyte for the use in H+-SOFC applications. More importantly, this new fabrication approach could be applied to other similar ABO3- perovskite material systems.

Original languageEnglish
Pages (from-to)14434-14440
Number of pages7
JournalInternational Journal of Hydrogen Energy
Volume39
Issue number26
DOIs
StatePublished - 3 Sep 2014

Keywords

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

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