Solid Oxide Fuel Cell (SOFC) cathodes are known as a major source of power losses especially when operating at intermediate temperature (IT) in the range of 600-800oC. Cathode materials with nanocomposite structure, e.g. perovskite-electrolyte composites or layered Ruddlesden-Popper type oxides, offer possibility to improve the oxygen transport by creating the channels of fast diffusion along perovskite/fluorite interface. This work presents the results regarding specific transport properties of nanocomposites based on perovskite-type oxides containing Pr and Ni/Co cations not doped with Sr and combined with doped ceria electrolytes.  The evaluated specific rates of exchange were found to exceed the values typical for Ni, Co-containing perovskites due to migration of transition metal cations on doped ceria domains. Exchange kinetics in SSITKA mode for nanocomposites was well fitted by a model considering ion exchange controlled diffusion with average self-diffusion coeffiients up to 10-8-10-12 cm2/s at 600 oC. The self-diffusioncoefficients  exceeded typical values for perovskites due to fast diffusion along the interfaces. Specific conductivity of nanocomposites measured by 4-probe method demonstrated up to 10-100 S/cm in the temperature range 600-8000C that is sufficient for effective SOFC cathodes.Support by German-Russian Project N_CATH of CLIENT Program and Russian Federal Program �Scientific and Educational Cadres of Russia� is gratefully acknowledged.

Oxygen transport in nanocomposite materials based on perovskite-type oxide PrNi1-xCoxO3 (Ln=Pr, La) as cathodes for intermediate temperature solid oxide fuel cells

246th National Meeting (2013)

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