溶胶凝胶法制备Ce_(0.8)Y_(0.2-x)Ca_xO_(2-δ)电解质材料及其性能  

Properties of Ce_(0.8)Y_(0.2-x)Ca_xO_(2-δ) Electrolyte Prepared by Sol-Gel Process

作　　者：田长安[1] 季必发[1] 吴凡[1] 王军[1] 谢劲松[1] 尹奇异[1] 鲍巍涛[1] 

机构地区：[1]合肥学院化学与材料工程系,合肥230601

出　　处：《硅酸盐学报》2014年第1期45-50,共6页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51102073);安徽省自然科学基金(10040606Q53;1308085QB35;KJ2012ZD15);安徽省高等学校自然科学基金(KJ2012B154;KJ2013B229);江苏省新型环保重点实验室开放课题基金(AE201361)

摘　　要：采用溶胶-凝胶法制备出Ce0.8Y0.2-xCaxO2-δ（0．02≤x≤0．10）系列电解质材料。通过红外、热重、X射线衍射、扫描电子显微镜、透射电子显微镜、交流阻抗和热膨胀系数测试对试样进行分析。结果表明：采用溶胶一凝胶法经600℃煅烧所得粉体形成了单相立方萤石结构，平均晶粒尺寸在5～10nm之间；Ce0.8Y0.2-xCaxO2-δ超细粉体具有较高的烧结活性，在1400℃烧结得到的Ce0.8Y0.2-xCaxO2-δ系列电解质陶瓷的相对密度均大于96％。在该系列材料中，Ce0.8Y0.2-xCaxO2-δ；具有良好的离子导电率、较低的电导活化能和适中的热膨胀性能。它在800℃时的离子电导率为0．041s／cm，电导活化能为0．81eV，热膨胀系数为13．5×10^-6K叫（常温～800℃）。Solid Oxide Fuel Cell considered as a new electrochemistry power source due to its clear and high efficiency with great application potential. Fluorite Ce0.8Y0.2-xCaxO2-δ（0.02≤x≤0.10）powders were synthesized by a sol--gel method. The sam- ples were characterized by Fourier transform infrared spectroscopy, thermcgravimetric analysis, X-ray diffraction, scanning elec- tron microscopy, transmission electron microscopy, AC impedance and thermal expansion, respectively. The results show that powders calcined at 600 ≤ have a cubic fluorite structure. The average grain sizes are between 5 and 10nm The ultrafine pow- ders ofCe0.8Y0.2-xCaxO2-δ, have a higher sintering activity. The Ce0.8Y0.2-xCaxO2-δseries electrolytic with the higher density of 96% can be obtained after sintered at 1 400℃ Among all the samples, Ce0. sY0.1Ca0.101.85 shows an excellent ionic conduc- tivity of 0. 041 S/cm （measured at 800 ℃）, a lower conductive activation energy of 0. 81eV and a suitable thermal expansion property of 13.5×10.6 K-1 （from room temperature to 800 ℃）.

关 键 词：固体氧化物燃料电池 电解质 溶胶凝胶 氧化铈 电导率 

分 类 号：TM911[电气工程—电力电子与电力传动]