Abstract
La-doped SrTiO3 (LST) powders were synthesized by ultrasonic spray pyrolysis using an aqueous solution of a metal nitrate. SEM images showed that the as-prepared LST powders had a spherical morphology with a diameter of 1 μm. XRD patterns showed that the crystal phase of the as-prepared powders was amorphous and that the powders crystallized to the perovskite phase by calcination at 900 °C. The sintered LST body had the highest electrical conductivity at a La doping concentration (Lax) of 0.1 under a reducing atmosphere. A solid oxide fuel cell (SOFC) with La0.1Sr0.9TiO3Sm-doped CeO2 (1:9) as the anode exhibited a maximum power density of 137.8 mW/cm2 and an open circuit voltage of 1.08 V at 880 °C.
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