Abstract
STS444 with or without La0.9Sr0.1MnO3 (LSM)-coating was contacted to La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O₃ (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), Rp 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 600oC in air were analyzed. Normalized data of net Cr effect showed that Ce 0.9 Gd 0.1 O₂ (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 ㏖% Y₂O₃-doped ZrO₂ (YSZ) electrolytes.
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