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http://dx.doi.org/10.4191/KCERS.2007.44.1.715

The Effect of Cr from STS Interconnect on the Polarization Resistance of LSCF Cathode  

Hwang, Ho-June (Fuel Cell Research Center and Department of Materials Science and Engineering, Pohang University of Science and Technology)
Choi, Gyeong-Man (Fuel Cell Research Center and Department of Materials Science and Engineering, Pohang University of Science and Technology)
Publication Information
Journal of the Korean Ceramic Society / v.44, no.12, 2007 , pp. 715-719 More about this Journal
Abstract
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.
Keywords
SOFC; STS444; Cathode; Chromium; Polarization resistance;
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