【摘要】 为了改善固体氧化物燃料电池的阴极热循环性能,采用喷涂方法在Ce0.8Sm0.2O1.9(SDC)电解质片的表面制备了La0.6Sr0.4Co0.2Fe0.8O3(LSCF)-(SDC)3层复合阴极,各层LSCF所占比例依次为40%、70%和100%(质量分数)。X射线衍射结果表明,LSCF与SDC无明显的反应。每层材料的热膨胀系数随LSCF含量的增加而增大,电阻率随LSCF含量的增加而下降。SEM观测证明阴极呈现多孔的微结构,且与电解质表面接触良好。在中温(500~800℃)测得的阴极极化曲线和阻抗谱结果表明,多层阴极材料具有比单层LSCF阴极更好的电化学性能和热循环稳定性,5次热循环后性能衰退从58%下降到12%。更多还原

【Abstract】 In order to improve the thermal cycle performance of the cathode of solid oxide fuel cells（SOFCs）,a three layers composite cathode of La_0.6Sr_0.4Co_0.2Fe_0.8O₃（LSCF）-Ce_0.8Sm_0.2O_1.9（SDC）was prepared on SDC electrolyte disk using spray method.The ratios of the layers are 40wt%,70wt% and 100wt%,respectively.X-ray diffraction results show that there was no obvious reaction between LSCF and SDC.The thermal expansion coefficient of each layer increases with LSCF content and the resistivity decreases with LSCF ratio.SEM shows that the cathode contacts with electrolyte well and it has a porous microstructure.The measurements results of polarization curves and impedance spectra at intermediate temperature（500～800℃） show that the multilayer-cathode has better electrochemical performance and thermal cycle stability than the LSCF cathode,and the degeneration after 5 thermal cycles reduces from 58%（LSCF cathode） to 12%（multilayer cathode）.更多还原