Abstract
The transport properties of mixed conducting Sm0.5Sr0.5CoO3−δ (SSC) films featuring mean grain sizes from 44 nm to 4.42 μm are studied with regard to grain-size effects. A remarkable enhancement in total conductivity of about one order is found in nano-scaled films than that of micro-crystalline films. In micro-crystalline films, a change in the transport mechanism as a function of temperature is observed, which is attributed to a transition from bulk controlled (at high temperatures) to grain-boundary controlled (at low temperatures) charge transportation. The films having nano-grains facilitates the charge transportation via parallel grain-boundaries and attribute to enhance the total conductivity through grain-boundaries. Alongside, the AC conductivity study showed that the charge carriers in nano-scaled films follow a long-range hopping path in the entire temperature region. Hence, the nano-scaled Sm0.5Sr0.5CoO3−δ cathodic films will give higher and steady state performance in solid oxide fuel cell (SOFC) in the low temperature region.
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