Abstract
Iron-cobalt-based perovskite materials with different A-site cations Ln0.7Sr0.3Fe0.8Co0.2O3-δ (Ln = La, Pr and Gd) were investigated for SOFC application as intermediate temperature cathodes. These samples were synthesized by a novel gel combustion process and characterized by X-ray diffraction. The diffraction patterns of the samples were indexed on the basis of an orthorhombic perovskite (GdFeO3-type) structure. The results of scanning electron microscopy showed that all of the powders have mean particle size less than 1 μm. The polarization resistance of the cathodes with samaria-doped ceria as electrolyte was studied by Electrochemical Impedance Spectroscopy. The best performance was obtained for the praseodymium compound, which exhibit an ASR of 0.30 Ω•cm2 at 700{degree sign}C, highly satisfactory value for technological applications, followed by the lanthanum one (0.42 Ω•cm2 at 700{degree sign} C). The ASR values for the gadolinium compound were higher than the others (1.05 Ω•cm2 at 700{degree sign}C).
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