Abstract
Sulfur dioxide (SO2) is one of the most major impurities in air and it induces a performance degradation of SOFC cathodes. Our group has investigated the enforced degradation behaviors of (LaSr)(CoFe)O3 (LSCF) cathodes by sulfur dioxide (SO2) containing air. It is clearly observed that SO2-induced degradation is affected by cell operation conditions, such as impurity concentration and the operating temperature. We observed two degradation steps; one is a rapid degradation rate occurring at an early stage and the other is a constant degradation with relatively slow rate. During progress of degradation, both ohmic resistance, R ohm, and oxygen reduction reaction resistance (polarization resistance), R p, increased. There is a relationship between increasing rates of R p and R ohm in each degradation step.
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