Synthesis and Electrical Properties of La Doped SrTiO_3 Powders by Ultrasonic Spray Pyrolysis

摘要

La-doped SrTiO_3 (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 (La_x) of 0.1 under a reducing atmosphere. A solid oxide fuel cell (SOFC) with La_(0.1)Sr_(0.9)TiO_3-Sm-doped CeO_2 (1:9) as the anode exhibited a maximum power density of 137.8 mW/cm~2 and an open circuit voltage of 1.08 V at 880 °C.