Fabrication and Characterization of La0.6Sr0.4Co0.2Fe0.8O3-δ-Yttria Stabilized Zirconia Composite Cathodes Prepared by Infiltration Method

Composite cathodes of yttria stabilized zirconia (YSZ) with Sr-, Co-doped LaFeO3 (LSCF) were prepared by infiltration of a porous YSZ matrix with different weight of aqueous solutions of the stoichiometric metal salts, followed by firing at various temperatures. X-ray diffraction measurements showed that the LSCF perovskite phase had formed at 800-900 degrees C and that solid-state reaction with the YSZ does not occur below approximately 950 degrees C. Various contents of LSCF from 15 wt% to 60 wt% are loaded in porous YSZ of anode supported cell (porous YSZ parallel to YSZ parallel to NiO-YSZ). The cell with 45 wt% LSCF exhibits better performance and lower interfacial resistance. The cell performance of LSCF fired at 850 degrees C is better than that of LSCF fired at 800 and 900 degrees C. The peak power densities of YSZ anode supported cell with 45 wt% LSCF fired at 850 degrees C are about 640, 869, and 972 mWcm(-2) at 700, 750, and 800 degrees C, respectively. The infiltrated LSCF cathode displays high catalytic activity and performance for the unique nano film coating fabricated with certain content at low temperature.