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J. Korean Ceram. Soc. > Volume 43(6); 2006 > Article
Journal of the Korean Ceramic Society 2006;43(6): 369.
doi: https://doi.org/10.4191/kcers.2006.43.6.369
(Ba0.5Sr0.5)0.99Co0.2Fe0.8O3-δ(BSCF)의 합성 및 BSCF/GDC(Buffer)/ScSZ의 전기화학적 특성
임용호, 황해진, 문지웅1, 박선민1, 최병현1, 이미재1
인하대학교 신소재공학부
Synthesis of (Ba0.5Sr0.5)0.99Co0.2Fe0.8O3-δ (BSCF) and the Electrochemical Performance of the BSCF/GDC(Buffer)/ScSZ
Yong-Ho Lim, Hae-Jin Hwang, Ji-Woong Moon1, Sun-Min Park1, Byung-Hyun Choi1, Mi-Jai Lee1
Inha University, School of Materials Science and Engineering
1Korea Institute of Ceramic Engineering and Technology
[ $(Ba_{0.5}Sr_{0.5})_{0.99}Co_{x}Fe_{1-x}O_{3-{delta}}$ ] [x=0.8, 0.2](BSCF) powders were synthesized by a Glycine-Nitrate Process (GNP) and the electrochemical performance of the BSCF cathode on a scandia stabilized zirconia, $[(Sc_{2}O_3)_{0.11}(ZrO_2)_{0.89}]-1Al_{2}O_3$ was investigated. In order to prevent unfavorable solid-state reactions between the cathode and zirconia electrolyte, a GDC ($Gd_{0.1}Ce_{0.9}O_{2-{delta}}$) buffer layer was applied on ScSZ. The BSCF (x = 0.8) cathode formed on GDC(Buffer)/ScSZ(Disk) showed poor electrochemical property, because the BSCF cathode layer peeled off after the heat-treatment. On the other hand, there were no delamination or peel off between the BSCF and GDC buffer layer, and the BSCF (x = 0.2) cathode exhibited fairly good electrochemical performances. It was considered that the observed phenomenon was associated with the thermal expansion mismatch between the cathode and buffer layer. The ohmic resistance of the double layer cathode was slightly lower than that of the single layer BSCF cathode due to the incorporation of platinum particle into the BSCF second layer.
Key words: Solid oxide fuel cell, $(Ba_{0.5}Sr_{0.5})_{0.99}Co_{0.2}Fe_{0.8}O_{3-{\delta}}$, Cathode, Scandia stabilized zirconia (ScSZ), Polarization resistance
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