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

Abstract

Composite cathodes of yttria stabilized zirconia (YSZ) with Sr-, Co- doped LaFeO3 (LSCF) are 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 show that the LSCF perovskite phase had formed at 800-900oC and that solid-state reaction with the YSZ does not occur below approximately 950 oC. Various contents of LSCF from 15wt.% to 60wt.% are loaded in porous YSZ of anode supported cell (porous YSZ||YSZ||NiO-YSZ). The cell with 45wt.% LSCF exhibits better performance and lower interfacial resistance. The cell performance of LSCF fired at 850oC is better than that of LSCF fired at 800 and 900oC. The peak power densities of YSZ anode supported cell with 45 wt.% LSCF fired at 850oC are about 640, 869, and 972mWcm-2 at 700, 750, and 800oC, respectively. The infiltrated LSCF cathode displays high catalytic activity and performance for the unique nano film coating fabricated with certain content at low temperature.