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http://dx.doi.org/10.4191/KCERS.2006.43.6.369

Synthesis of (Ba0.5Sr0.5)0.99Co0.2Fe0.8O3-δ (BSCF) and the Electrochemical Performance of the BSCF/GDC(Buffer)/ScSZ  

Lim, Yong-Ho (Inha University, School of Materials Science and Engineering)
Hwang, Hae-Jin (Inha University, School of Materials Science and Engineering)
Moon, Ji-Woong (Korea Institute of Ceramic Engineering and Technology)
Park, Sun-Min (Korea Institute of Ceramic Engineering and Technology)
Choi, Byung-Hyun (Korea Institute of Ceramic Engineering and Technology)
Lee, Mi-Jai (Korea Institute of Ceramic Engineering and Technology)
Publication Information
Journal of the Korean Ceramic Society / v.43, no.6, 2006 , pp. 369-375 More about this Journal
Abstract
[ $(Ba_{0.5}Sr_{0.5})_{0.99}Co_{x}Fe_{1-x}O_{3-{\delta}}$ ] [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.
Keywords
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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