Abstract
AbstractThe degradation of composite LSCF‐SDC cathodes on porous 430 stainless steel supports was investigated. Two degradation mechanisms were observed: a multi‐layer oxide scale, believed to consist of Cr2O3 and SrCrO4, formed at the support‐cathode interface, and small amounts of chromium were detected within the cathodes. To reduce degradation, La2O3 and Y2O3 reactive element oxide coatings were deposited on the internal pore surfaces of the metal supports. The reactive element oxide coatings reduced the amount of volatile chromium that deposited in the cathodes. As a result, the degradation rates of the cathodes on coated supports were significantly lower than the degradation rates of cathodes made on uncoated metal supports. In cathode symmetrical cells, polarization resistance degradation rates as low as 2.56 × 10−6 Ω cm2 h−1 were observed over 100 hours on coated metal supports, compared to an average of 1.23 × 10−4 Ω cm2 h−1 on uncoated supports.
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