Abstract
Perovskite Ba0.8La0.2FeO3-δ was synthesized via a glycine–nitrate process as the cathode material for intermediate-temperature solid oxide fuel cells. Ultra-fine pure phase Ba0.8La0.2FeO3-δ powder was obtained after the self-propagating combustion of a complex xerogel precursor. The Ba0.8La0.2FeO3-δ cathode showed good compatibility and an enhanced phase interface with a samarium-doped ceria electrolyte. Electrochemical measurements showed that the Ba0.8La0.2FeO3-δ cathode achieved a low polarization resistance of 0.58 Ω cm2 at 800 °C in an air atmosphere. The porous nanostructure guaranteed the catalytic activity for the oxygen reduction reaction, even if the cathode material possessed a cobalt-free and low rare earth composition.
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