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J. Korean Ceram. Soc. > Volume 48(5); 2011 > Article
Journal of the Korean Ceramic Society 2011;48(5): 479.
doi: https://doi.org/10.4191/kcers.2011.48.5.479
Preparation and Electrochemical Performance of Electrode Supported La0.75Sr0.25Ga0.8Mg0.16Fe0.04O3-δ Solid Oxide Fuel Cells
Ji-Haeng Yu, Sang-Woon Park, Sang-Kuk Woo
Energy Materials Research Center, Korea Institute of Energy Research
In this paper, investigations of thick film $La_{0.75}Sr_{0.25}Ga_{0.8}Mg_{0.16}Fe_{0.04}O_{3-{delta}}$ (LSGMF) cells fabricated via spin coating on either NiO-YSZ anode or $La_{0.7}Sr_{0.3}Ga_{0.6}Fe_{0.4}O_3$ (LSGF) cathode substrates are presented. A La-doped $CeO_2$ (LDC) layer is inserted between NiO-YSZ and LSGMF in order to prevent reactions from occurring during co-firing. For the LSGF cathode-supported cell, no interlayer was required because the components of the cathode are the same as those of LSGMF with the exception of Mg. An LSGMF electrolyte slurry was deposited homogeneously on the porous supports via spin coating. The current-voltage characteristics of the anode and cathode supported LSGMF cells at temperatures between $700^{circ}C$ and $850^{circ}C$ are described. The LSGF cathode supported cell demonstrates a theoretical OCV and a power density of ~420 mW $cm^2$ at $800^{circ}C$, whereas the NiO-YSZ anode supported cell with the LDC interlayer demonstrates a maximum power density of ~350 mW $cm^2$ at $800^{circ}C$, which decreased more rapidly than the cathode supported cell despite the presence of the LDC interlayer. Potential causes of the degradation at temperatures over $700^{circ}C$ are also discussed.
Key words: Solid oxide fuel cell, LSGM, Thick film, Degradation
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