【摘要】 采用固相反应法合成了(Pr1-xNdx)0.6Sr0.4Co0.8Fe0.2O3-δ(x=0.2、0.4、0.6、0.8)钙钛矿氧化物系样品,采用XRD分析物相结构,采用XPS分析化学状态,用电导弛豫法研究了(Pr1-xNdx)0.6Sr0.4Co0.8Fe0.2O3-δ系样品的氧化学扩散性能。实验结果表明,(Pr1-xNdx)0.6Sr0.4Co0.8Fe0.2O3-δ体系样品的氧化学扩散系数Dchem随温度的升高、Nd含量的增加而上升,电导率随氧分压的增大而增大;样品(Pr0.2Nd0.8)0.6Sr0.4Co0.8Fe0.2O3-δ氧扩散系数最大,在800℃时达到6.75×10-5cm2/s;样品(Pr0.2Nd0.8)0.6Sr0.4Co0.8Fe0.2O3-δ在600℃下氧分压为1.0×105Pa时电导率达到最大值为1318.138S/cm,是比较理想的固体氧化物燃料电池的阴极材料。更多还原

【Abstract】 Perovskite oxides of(Pr1-xNdx)0.6Sr0.4Co0.8Fe0.2O3-δ(x=0.2,0.4,0.6,0.8) samples were obtained by solid state-reaction method.Its phase structures and chemistry state were analysed by X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS).The oxygen chemical diffusion coefficient of(Pr1-xNdx)0.6Sr0.4Co0.8Fe0.2O3-δ was determined by electrical conductivity relaxation technique.The resultes show that the conductivity of(Pr1-xNdx)0.6Sr0.4Co0.8Fe0.2O3-δ increases with increasing of oxygen partial pressure.The(Pr1-xNdx)0.6Sr0.4Co0.8Fe0.2O3-δ samples have higher oxygen chemical diffusion coefficient,which increase with the increasing of temperature and increasing of content Nd.The oxygen chemical diffusion coefficient was highest at x=0.8,which achieved 6.75×10-5cm2/s at 800℃.The max conductivity of the specimen of(Pr0.2Nd0.8)0.6Sr0.4Co0.8Fe0.2O3-δ is 1318.138S/cm at 600℃,1.0×105Pa oxygen partial pressure,is comparatively potential cathodes material for intermediate temperature solid oxide fuel cells.更多还原