La0.6Sr0.4Co0.2Fe0.8O3–Ag Composite Cathode for Intermediate-Temperature Solid Oxide Fuel Cells

Abstract

The composite electrode of La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) and Ag was examined as an air electrode for intermediate-temperature solid oxide fuel cells. Two types of LSCF/Ag composite electrodes were prepared. One was made by firing the printed sheet of LSCF-GDC (10mol%Gd2O3 doped CeO2)-Ag powder mixture on the GDC/8mol%Y2O3 doped zirconia (YSZ) electrolyte, and the other was prepared by firing the LSCF electrode on GDC/YSZ infiltrating a AgNO3 solution in the pores of the electrode. In both cases, the cathode polarization overpotentials were reduced by the addition of Ag into LSFC. The power density of anode support cells with the LSCF electrode was increased from 0.28W∕cm2to0.34W∕cm2 at 600°C by infiltrating a AgNO3 solution into the electrode.