Journal
SOLID STATE IONICS
Volume 175, Issue 1-4, Pages 63-67Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ssi.2004.09.013
Keywords
oxygen diffusion; surface exchange; IT-SOFC cathodes; impedance spectroscopy; composite cathode
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The oxygen transport properties and the performance of the composite La(0.6)r(0.4)CO(0.2)Fe(0.8)O(3)-sigma/Ce0.8Ge0.2O2-x, a potential IT-SOFC cathode material, were investigated. Using the isotopic exchange depth profiling (IEDP) technique with secondary ion mass spectroscopy (SIMS), the oxygen tracer diffusion coefficient, D* and the surface exchange coefficient k were measured. The measured D* values of the composite material were higher than that of the non-composite LSCF diffusion coefficient values, while the k values were similar to the noncomposite material at all temperatures. The area-specific resistance of the porous composite cathode was measured by impedance spectroscopy. A performance improvement was observed below 650 degreesC when compared to a non-composite LSCF cathode. This improvement was mainly attributed to the improvement in the oxygen tracer diffusion coefficient of the LSCF/CGO composite.
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