Doped-Ceria Diffusion Barriers Prepared by Infiltration for Solid Oxide Fuel Cells

Abstract

The most commonly used material for cathodes in solid oxide fuel cells is a composite of Sr-doped LaMnO3 LSM and yttriastabilized zirconia YSZ, with the LSM in the composite providing electronic conductivity and catalytic activity for oxygen reduction. The addition of YSZ to the electrode provides ionic conductivity to increase the length of the three-phase boundary by providing ionconducting channels from the electrolyte into the electrode. 1 In most cases, LSM‐YSZ composites are prepared by sintering a mixture of LSM and YSZ powders onto the YSZ electrolyte. Relatively high temperatures 1300 K 2 are required to sinter the YSZ particles in the electrode to the electrolyte. Significantly improved performance can be achieved by replacing LSM with mixed conducting perovskites, such as Sr-doped LaCoO3 LSCo, 3-7 LaFeO3 LSF, 8-12