Abstract
In present paper, La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF)/Ce0.9Gd0.1O1.95 (GDC)/LSCF structure has been studied to understand electrode/electrolyte interface. The nanocrystalline powder required for screen printing was obtained through solution combustion synthesis with glycine as a fuel. The LSCF powder synthesized at fuel to oxidant ratio of two is calcined at 900°C as TG–DTA reveals thermal stability only beyond 900°C. The X-ray diffraction pattern of calcined powder demonstrates rhombohedral perovskite structured LSCF with 27nm crystallite size. However, dynamic laser scattering shows 0.9μm sized agglomerates while TEM shows 74nm particles. For potential application in solid oxide fuel cells, the temperature programmed reduction and oxidation were done on the LSCF. The results exhibit strong reduction and oxidation behavior around 860 and 388°C, respectively. The cell with LSCF as an electrode shows minimum charge transfer resistance of 6.3Ωcm2 at 550°C.
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