Studies on chemical stability and electrical properties of proton conducting perovskite-like doped BaCeO3

Jasmine Dauter, Nicola Maffei, Surinderjit S. Bhella, Venkataraman Thangadurai*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The chemical stability and electrical properties of three promising perovskite-related structures BaCe0.8Gd0.15Pr 0.05O3-δ, BaCe0.85Sm0.15O 3-δ, and BaCe0.85Eu0.15O 3-δ were tested in air, humidified N2 and H 2, as well as in D2O+ N2. Powder X-ray diffraction studies confirmed the formation of a cubic perovskite-like structure. The change in the lattice constant was consistent with B-site substitution in BaCeO3. All the investigated compounds formed barium carbonate in CO2 at elevated temperatures and were found to be chemically unstable in boiling H2 O. The data showed that these three compounds are chemically stable in humidified CH4 at 800°C; however, at 600°C, the formation of barium carbonate was observed. The electrical conductivity in wet N2 and/or H2 was found to be higher than that in the D2 O -containing atmosphere, confirming proton conduction in the doped BaCeO3. The Gd+Pr co-doped BaCeO 3 showed the highest total conductivity of 2.58× 10 -2 S cm-1 in H2 +3% H2 O at 700°C with an activation energy of 0.36 eV in the temperature range of 450-700°C.

Original languageEnglish
Pages (from-to)B1413-B1418
JournalJournal of The Electrochemical Society
Volume157
Issue number10
DOIs
Publication statusPublished - 2010

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