Abstract: Perovskite-type ultrafine La_(0.7)Sr_(0.2)Co_(0.1)CuO_(3-σ) powders used as cathode materials for intermediate temperature solid oxide fuel cell (IT-SOFC) were directly synthesized by a citrate process and the microstructure was observed with scanning electron microscopy (SEM) and analyzed by DSC-TG、XRD. Baking the precursor at different temperature in order to get the powder with different specific surface area. Using semi-dry method to sharp the LSCC and test electrical conductivity in intermediate temperature. The results indicate that high purity ultrafine LSCC powder can be synthesis by citrate process and self-combusting method and it shows good electrical conductivity(more than 150 S/cm), output power(0.85 W/cm~2 and activation energy(112.1 kJ/mol)in suitably temperature.

Key words: La_(0.7)Sr_(0.2)Co_(0.1)CuO_(3-σ);intermediate temperature solid oxide fuel cell (IT-SOFC);cathode materials;perovskite type