复合阴极材料La_(1-x)Sr_xCuO_(3-δ)-SDC的制备及电学性能

Preparation and Electrical Properties of Composite Cathode Material La_(1-x)Sr_(x)CuO_(3-δ)-SDC for IT-SOFCs

合成具有单相正交钙钛矿结构的La1-xSrxCuO3-δ(x=0.15,0.2,0.3,0.4)系列样品,碘量滴定法实验结果表明,随着Sr掺入量的增加,Cu3+离子的含量逐渐增加.电学性能研究结果表明,La0.7Sr0.3CuO3-δ电导率最高,与La0.6Sr0.4CoO3-δ相比,La0.7Sr0.3CuO3-δ具有更好的电化学性能,可作为一种新的中温固体氧化物燃料电池(IT-SOFC)阴极材料.将La0.7Sr0.3CuO3-δ与不同质量比的中温电解质Ce0.85Sm0.15O2-δ(SDC)固相混合,制备复合阴极材料,电化学性能测试结果表明,掺入适量的SDC有利于降低La0.7Sr0.3CuO3-δ电极的极化,获得性能更优越的IT-SOFC阴极材料,提高在中温区单电池的输出功率.

The cathode material La1-xSrxCuO3-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 La0.7Sr0.3CuO3-δ has the highest electrical conductivity. La0.7Sr0.3CuO3-δ powder was mixed with different amount of SDC （ Sm0.15Ce0.85O1.925 ） 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 La0.7Sr0.3CuO3-δ can improve the electrochemical properties, and a better cathodic performance can be obtained. Using La0.7Sr0.3 CuO3-δ-SDC composite materials as a cathode based on SDC electrolyte higher current density and power density can be obtained at intermediate temperatures.