Abstract: The cathode material La_1-xSr_xCuO_3-δ(x=0.15, 0.2, 0.3, 0.4) was synthesized by a sol-gel method. X-ray diffraction reveals that it is a single phase of perovskite. The investigation of the electrical properties suggest that La_0.7Sr_0.3CuO_3-δ has the highest electrical conductivity. La_0.7Sr_0.3CuO_3-δ powder was mixed with different amount of SDC(Sm_0.15Ce_0.85O_1.925) powder(5%—30%, mass fraction) as composite cathodes. Electrochemical properties of the composite cathodes were researched further. The investigation suggests the addition of appropriate amount SDC to La_0.7Sr_0.3CuO_3-δ can improve the electrochemical properties, and a better cathodic performance can be obtained. Using La_0.7Sr_0.3CuO_3-δ-SDC composite materials as a cathode based on SDC electrolyte higher current density and power density can be obtained at intermediate temperatures.

Key words: IT-SOFC, Composite cathode, La_1-xSr_xCuO_3-δ, SDC