Interrelation between Sulfur Poisoning and Performance Degradation of LSCF Cathode for SOFCs

Performance degradation of SOFC cathodes has been partly attributed to sulfur dioxide (SO2), which is one of the major impurities naturally present in air. In this work, the sulfur poisoning behavior of (LaSr)(CoFe)O3 (LSCF) cathodes exposed to 1 ppm of SO2 in air was investigated as a function of t...

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Published in:Journal of the Electrochemical Society 2016-01, Vol.163 (8), p.F899-F904
Main Authors: Wang, Fangfang, Kishimoto, Haruo, Develos-Bagarinao, Katherine, Yamaji, Katsuhiko, Horita, Teruhisa, Yokokawa, Harumi
Format: Article
Language:English
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Summary:Performance degradation of SOFC cathodes has been partly attributed to sulfur dioxide (SO2), which is one of the major impurities naturally present in air. In this work, the sulfur poisoning behavior of (LaSr)(CoFe)O3 (LSCF) cathodes exposed to 1 ppm of SO2 in air was investigated as a function of time under various operation temperatures of 923 K, 973 K, and 1073 K. Severe performance degradation was observed at low temperatures of 923 K and 973 K. For these cases, only the polarization resistance (Rp) was increased, additionally no sulfur component was detected in the LSCF cathode. At 1073 K, both Rp and ohmic resistance (Rohmic) increased during the progress of degradation and SrSO4 was observed in cathode, especially near the LSCF/GDC interface. Plausible sulfur poisoning mechanisms were proposed based on the observed experimental phenomena.
ISSN:0013-4651
1945-7111
DOI:10.1149/2.1151608jes