摘要
采用溶胶-凝胶法制备了Nd0.6-xBaxSr0.4Co0.2Fe0.8O3-δ(x=0,0.05,0.10,0.15,0.20,NBSCF)粉体与电解质粉体Ce0.8Sm0.2O1.9(SDC).利用X射线衍射仪、热膨胀仪分别对材料的晶体结构和烧结陶瓷体的热膨胀系数(TEC)进行表征.以不同组分的NBSCF-30%SDC为复合阴极,以SDC为电解质,用交流阻抗法测试了550～750℃范围内对称电极的极化电阻.结果表明,合成的NBSCF粉体均形成了单相正交钙钛矿结构.随着Ba含量的增加,材料的热膨胀系数增大,复合阴极的极化电阻减小.当x=0.20时,NBSCF-30%SDC复合阴极的极化电阻最小,750℃时为0.032Ω.cm2.
Nd0.6-xBaxSr0.4Co0.2Fe0.8O3-δ（NBSCF） and Ce0.8Sm0.2O1.9（SDC） powders were synthesized by the sol-gel process.The crystal structure of the Nd0.6-xBaxSr0.4Co0.2Fe0.8O3-δ powders was investigated by X-ray diffractometer,and the thermal expansion coefficient（TEC） of the sintered sample was measured by dilatometer.The polarization resistance of the symmetrical NBSCF-30% SDC composite cathodes and SDC electrolyte were investigated using alternating current impedance spectroscopy in temperature range 550~750 ℃.The XRD results show that all powders form structure with single phase of orthorhombic symmetry.The thermal expansion coefficient increased and the polarization resistance of the composite cathodes decreased with increasing Ba content.The polarization resistance of Nd0.4Ba0.2Sr0.4Co0.2Fe0.8O3-δ-30% SDC had the lowest value of 0.032 Ω·cm2 at 750 ℃ in air.
出处
《内蒙古科技大学学报》
CAS
2012年第2期157-161,共5页
Journal of Inner Mongolia University of Science and Technology
基金
内蒙古自然科学基金资助项目(2010ZD04)
内蒙古科技大学创新基金资助项目(2010NC020)
关键词
固体氧化物燃料电池
复合阴极
热膨胀系数
极化电阻
solid oxide fuel cells； cathodes； thermal expansion coeffecient； impedance resistance
作者简介
周芬（1973-），女，江苏徐州人，内蒙古科技大学副教授，主要从事固体氧化物燃料电池材料研究
