中文摘要：

采用改进的溶胶-凝胶法合成固体氧化物燃料电池阴极系粉体Pr0.6-zSr0.4Co0.8Fe0.2O3-δ（PSCF）（z=0,0.02,0.05,0.1）。使用X射线衍射（XRD）、扫描电子显微镜（SEM）对其相结构与形貌进行了分析,结果表明：900℃以上焙烧后的阴极粉体Pr0.6-zSr0.4Co0.8Fe0.2O3-δ（z=0,0.02,0.05,0.1）为单一的钙钛矿结构。1000℃烧结的样品内粒子分布比较均匀,且颗粒内部存在一定程度的空隙,并与电解质附着情况良好。用直流四电极法测试阴极体系样品在400～750℃的电导率,发现各试样混合离子电子电导率均高于786 S.cm-1,能够满足固体氧化物燃料电池对阴极电导率的要求。用交流阻抗法测定PSCF-Ce0.8Sm0.2O1.9体系样品的阻抗谱,得到1000℃烧结的阴极体系对称电池在测试温度为750℃z=0,z=0.02,z=0.05时的极化电阻分别为0.041,0.040,0.034Ω.cm-2。

英文摘要：

The Pr0.6-zSr0.4Co0.8Fe0.2O3-δ（PSCF） cathode powders were synthesized by a novel sol-gel method.The phase evolutions and microstructure were studied by X-ray diffraction and scanning electron microscope.The polarization resistance and conductivity in air atmosphere were measured.It was found that well-crystallized perovskite was obtained by heated at 900 ℃ for 6 h.Samples sintered at 1000 ℃ had grain size and reasonable porosity to ensure gas diffuse.Also the cathode appeared to be in good contact with the dense electrolyte pellet.The conductivities of PSCF were all higher than 786 S·cm-1 in a temperature range of from 400 to 750 ℃.The polarization resistances of Pr0.6Sr0.4Co0.8Fe0.2O3-δ-SDC,Pr0.58Sr0.4Co0.8Fe0.2O3-δ-SDC and Pr0.55Sr0.4Co0.8Fe0.2O3-δ-SDC were 0.041,0.040 and 0.034 Ω·cm-2 at 750 ℃,respectively.