Influence of A-site Deficiency in BaZr0.8Y0.2O3-δ on the Performance of La0.6Sr0.4Co0.2Fe0.8O3-δ-BaZr0.8Y0.2O3-δ Composite Cathodes
Lei Bi, Emiliana Fabbri and Enrico Traversa
Affiliation: International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
Keywords: A-site deficiency, BaZrO3, Cathode performance, Proton-conducting oxides, Solid oxide fuel cells (SOFCs).
Ba1-xZr0.8Y0.2O3-δ (x = 0, 0.025, 0.05 and 0.075) powders were successfully prepared via a combustion method.
Coupled with La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF), LSCF-Ba1-xZr0.8Y0.2O3-δ composite powders were evaluated as potential
cathode materials for proton-conducting solid oxide fuel cells (SOFCs). LSCF showed chemical compatibility with Ba1-
xZr0.8Y0.2O3-δ powders up to 1000 oC. LSCF-Ba1-xZr0.8Y0.2O3-δ composite cathodes were painted on both sides of sintered
BaZr0.8Y0.2O3-δ pellets, used as electrolytes, and fired at 1000 oC to form symmetrical cells. Electrochemical impedance
spectroscopy results for symmetrical cells indicated that the A-site deficiency in BaZr0.8Y0.2O3-δ increased the polarization
resistance for the composite cathode compared with the deficiency-free sample, and the larger the increase in the A-site
deficiency, the larger the polarization resistance.
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