摘要
采用凝胶浇注法合成中温固体氧化物燃料电池（IT—SOFC）阴极材料Sm0．5，Sr0．4Ca0．1，CoO3（SSCC）。利用差热-热重（TG—DTA）、X射线衍射（XRD）、扫描电子显微镜（SEM）、热膨胀、电导率以及交流阻抗谱等技术研究SSCC的结构和性能。结果表明：SSCC与电解质Sm1.2Ce0.8O1.9（SDC）具有良好的化学相容性，电极在1150℃煅烧4h后，与SDC电解质可形成良好的接触界面；SSCC的电导率在400—800℃达到400S／cm以上，50．800℃SSCC阴极的平均热膨胀系数为16．31×10^-6K^-1，SSCC的极化电阻较小，700℃时仅为0．13Ω·cm^2，预示其可作为IT—SOFC较为理想的阴极备选材料。
Sm0.5,Sr0.4Ca0.1,CoO3 （SSCC） as cathode material for intermediate temperature solid oxide fuel cell （IT-SOFC）was synthesized by gel-casting process. The structure and performance of SSCC cathode were investigated by TG-DTA, X-ray diffraction （XRD）, Scanning Electron Microscopy （SEM）, thermal expansion, electrical conductivity, and alternating current impedance spectroscopy. The results show that SSCC has good chemical compatibility with electrolyte Sm0.2Ce0.8O1.9 （SDC）. The SSCC electrodes contact well with SDC electrolyte after being sintered at 1 150 ℃ for 4 h. The electrical conductivity of SSCC is higher than 400 S/cm at 400-800 ℃. The thermal expansion coefficient is 16.31×10^-6 K^-1 at 50-800 ℃. The interracial impedance between SSCC and SDC is 0.13 Ω·cm^2 at 700 ℃. The results indicate that SSCC could be a potential cathode material for ITSOFC.
出处
《兵器材料科学与工程》
CAS
CSCD
2011年第6期76-80,共5页
Ordnance Material Science and Engineering
基金
安徽工程大学青年基金(2007YQ028)资助项目
