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La0.6Sr0.4Fe0.8Mn0.2O3 (LSFM) compound is synthesized by Sol-gel method andevaluated as a cathode material for the intermediate temperature solid oxidefuel cell (IT-SOFC). X-ray diffraction (XRD) indicates that the LSFM has aRhombohedral structure with R-3c space group symmetry. The XRD patterns revealvery small amount of impurity phase in the LSFM and Y2O3-Stabilized ZrO2 (YSZ)mixture powders sintered at 600, 700 and 800 C for a week. The maximumelectrical conductivity of LSFM is about 35.35 S.cm-1 at 783 C in the air. Theoxygen chemical diffusion coefficients, DChem, are increased from 1.39*10-6 upto 7.66*10-6 .cm2. Besides, the oxygen surface exchange coefficients, kChem,are obtained to lie between 2.9*10-3 and 8.7*10-3 cm.s-1 in a temperature rangeof 600-800 C. The area-specific resistances (ASRs) of the LSFM symmetrical cellare 7.53, 1.53, 1.13, 0.46 and 0.31 .cm2 at 600, 650, 700, 750 and 800 Crespectively, and related activation energy, Ea, is about 1.23 eV.

Investigation of structural, electrical and electrochemical properties  of La0.6Sr0.4Fe0.8Mn0.2O3-{\delta} as an intermediate temperature solid oxide  fuel cell cathode