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J. Korean Ceram. Soc. > Volume 44(12); 2007 > Article
Journal of the Korean Ceramic Society 2007;44(12): 715.
doi: https://doi.org/10.4191/kcers.2007.44.1.715
스테인리스 스틸 연결재의 Cr이 LSCF 양극의 분극저항에 미치는 영향
황호준, 최경만
POSTECH 신소재공학과
The Effect of Cr from STS Interconnect on the Polarization Resistance of LSCF Cathode
Ho-June Hwang, Gyeong-Man Choi
Fuel Cell Research Center and Department of Materials Science and Engineering, Pohang University of Science and Technology
STS444 with or without $La_{0.9}Sr_{0.1}MnO_3$ (LSM)-coating was contacted to $La_{0.6}Sr_{0.4}Co_{0.2}Fe_{0.8}O_3$ (LSCF) cathode on various electrolyte materials and the polarization resistance $(R_p)$ was measured by impedance spectroscopy. By making a symmetric half-cell and contacting only one side of the cathode with the interconnect, the effect of chromium (Cr) poisoning was separated from the aging effects. When the LSCF cathode was contacted with LSM-coated STS (stainless steel), $R_p$ of LSCF was lower than that contacted with the uncoated STS. Impedance patterns measured for the working electrode (W.E.), the counter electrode (C.E.) at $600^{circ}C$ in air were analyzed. Normalized data of net Cr effect showed that $Ce_{0.9}Gd_{0.1}O_2$ (GDC) electrolyte is more tolerant to the chromium poisoning than $La_{0.9}Sr_{0.1}Ga_{0.8}Mg_{0.2}$ (LSGM) or 8 mol% $Y_2O_3-doped$ $ZrO_2$ (YSZ) electrolytes.
Key words: SOFC, STS444, Cathode, Chromium, Polarization resistance
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