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| Ag-YSB composite cathodes for intermediate temperature solid oxide fuel cells |
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| 中国科学技术大学材料科学与工程系 |
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Cite this article:
. Ag-YSB composite cathodes for intermediate temperature solid oxide fuel cells. Chin J Mater Res, 2005, 19(1): 54-58.
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Abstract Yttrium stabilized bismuth (Y$_{0.25}$Bi$_{0.7}$5O$_{1.5}$) (YSB) was synthesized
using an oxalate coprecipitation method. YSB powder was fired at 900℃ for 5 h to
form the fluorite structure as confirmed by X--ray diffraction. The conductivity was
measured to be 0.057 S/cm at 600℃. Influences of sintering temperature on
microstructure of Ag--YSB composites were investigated, and results indicate that
lower sintering temperature resulted in high porosity and small particle size. Using
SDC electrolyte, the interfacial resistance was found to be smallest for 50\% YSB
~about ~0.64 $\Omega\cdot$cm$^{2}$ ~at ~600℃ ~and 0.059 $\Omega\cdot$cm$^{2}$ at 700℃.
The performance of Ag--YSB was much better than some perovskite cathodes,
such as LSCF--SDC and LSM--SDC.
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Received: 16 March 2005
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