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J. Korean Ceram. Soc. > Volume 52(5); 2015 > Article
Journal of the Korean Ceramic Society 2015;52(5): 308.
doi: https://doi.org/10.4191/kcers.2015.52.5.308
Electrochemical Performance and Cr Tolerance in a La1-xBaxCo0.9Fe0.1O3-δ (x = 0.3, 0.4 and 0.5) Cathode for Solid Oxide Fuel Cells
Yeong-Ju Choe, Hae-Jin Hwang
Departments of Materials Science and Engineering, Inha University
ABSTRACT
The electrochemical performance and Cr poisoning behavior of $La_{1-x}Ba_xCo_{0.9}Fe_{0.1}O_{3-{delta}}$ (LBCF, x = 0.3, 0.4, 0.5) and $La_{0.6}Sr_{0.4}Co_{0.2}Fe_{0.8}O_{3-{delta}}$ (LSCF) cathodes were investigated for solid oxide fuel cells (SOFCs). The polarization resistance of the LBCF/GDC/LBCF symmetrical cell was found to decrease with increasing Ba content (x value). This phenomenon might be associated with the high oxygen vacancy concentration in the LBCF sample, with x = 0.5. In addition, there was no chromium poisoning in the LBCF cathode. On the other hand, the polarization resistance of the LSCF cathode was found to significantly increase after exposure to gaseous chromium species; it appears that this result stemmed from the formation of $SrCrO_4$ phase. Therefore, it can be expected that LBCF can be a durable potential cathode material for intermediate-temperature solid oxide fuel cells (IT-SOFC).
Key words: Solid oxide fuel cells, Cathode, Perovskite, $La_{1-x}Ba_xCo_{0.9}Fe_{0.1}O_{3-{\delta}}$, Cr poisoning
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