Tailoring the chemical stability of Ba(Ce0.8 - xZrx)Y0.2O3 - δ protonic conductors for Intermediate Temperature Solid Oxide Fuel Cells (IT-SOFCs)

Emiliana Fabbri*, Alessandra D'Epifanio, Elisabetta Di Bartolomeo, Silvia Licoccia, Enrico Traversa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

397 Scopus citations

Abstract

A soft chemistry method was used to synthesize BaCe0.8 - xZrxY0.2O3 - δ (BCZY, with 0.0 ≤ x ≤ 0.8) proton conductors to combine the high proton conductivity of barium cerate and good chemical stability of barium zirconate. To verify the chemical stability, all the synthesized oxides were exposed to 100% CO2 at 900 °C for 3 h and the phase composition of the resulting specimens was investigated by X-ray diffraction (XRD) analysis. The chemical stability against CO2 increased with increasing the Zr content, with good results for samples with x ≥ 0.5. The electrical conductivity of the samples was investigated as a function of the Zr content using Electrochemical Impedance Spectroscopy (EIS) measurements. Hydrogen-air fuel cell experiments were carried out at 700 °C using the BCZY proton conducting electrolytes and platinum electrodes. Promising performance was observed for BaCe0.3Zr0.5Y0.2O3 - δ because it maintains the good chemical stability of barium zirconate but with improved electrical conductivity and fuel cell performance.

Original languageEnglish (US)
Pages (from-to)558-564
Number of pages7
JournalSolid State Ionics
Volume179
Issue number15-16
DOIs
StatePublished - Jun 30 2008

Keywords

  • Chemical stability
  • Intermediate Temperature Solid Oxide Fuel Cell
  • Proton conductor
  • Zr-substituted BaCeO

ASJC Scopus subject areas

  • Electrochemistry
  • Physical and Theoretical Chemistry
  • Energy Engineering and Power Technology
  • Materials Chemistry
  • Condensed Matter Physics

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