(Pr_(1-x)Nd_x)_(0.6)Sr_(0.4)Co_(0.8)Fe_(0.2)O_(3-δ)体系双稀土阴极材料的氧化学扩散系数及电学性能的研究  

Investigation on oxygen chemical diffusion coefficient and electrical properties of (Pr_(1-x)Nd_x)_(0.6)Sr_(0.4)Co_(0.8)Fe_(0.2)O_(3-δ) system with two rare earths for cathodes

作　　者：王晓波[1] 丁铁柱[1] 潮洛蒙[1] 尚涛[1] 张磊[1] 闫祯[1] 李丽[1] 

机构地区：[1]内蒙古大学物理科学与技术学院,内蒙古呼和浩特010021

出　　处：《功能材料》2011年第1期5-9,共5页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(10464001);内蒙古高校自然科学基金重点资助项目(NJ09002)

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。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.

关 键 词：(Pr1-xNdx)0.6Sr0.4Co0.8Fe0.2O3-δ 氧化学扩散 钙钛矿氧化物 电导弛豫 

分 类 号：O552.2[理学—热学与物质分子运动论] TQ15[理学—物理]