TY - JOUR
T1 - Studies on chemical stability and electrical properties of proton conducting perovskite-like doped BaCeO3
AU - Dauter, Jasmine
AU - Maffei, Nicola
AU - Bhella, Surinderjit S.
AU - Thangadurai, Venkataraman
PY - 2010
Y1 - 2010
N2 - 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.
AB - 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.
U2 - 10.1149/1.3464774
DO - 10.1149/1.3464774
M3 - Article
AN - SCOPUS:77956198870
SN - 0013-4651
VL - 157
SP - B1413-B1418
JO - Journal of The Electrochemical Society
JF - Journal of The Electrochemical Society
IS - 10
ER -