| 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 |
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| ABSTRACT |
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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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