Abstract
Chromium deposition and poisoning of cathodes is one of the most important degradation mechanisms of solid oxide fuel cell (SOFC). In this presentation, we will report the development of a BaO modified La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) cathode with substantial chromium tolerance, using EIS, SEM-EDS, XRD, XPS and ToF-SIMS. The BaO infiltration dramatically enhances the performance stability of LSCF in the presence of Fe-Cr interconnect. The infiltrated BaO nanoparticles inhibit the formation of SrCrO4 by forming thermodynamically stable and conducive BaCrO4, preventing the extraction of Sr at the A-site of LSCF perovskite structure and thus successfully mitigating the poisoning effect of Cr on the electrocatalytic activity and electrical conductivity of LSCF. This study offers a new and effective strategy to develop highly tolerant and resistant cathodes towards Cr contaminant for SOFCs.
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