复合电解质BaCe_(0.8)Y_(0.2)O_(2.9)–Ce_(0.8)Gd_(0.2)O_(1.9)的化学稳定性  

Chemical Stability of BaCe_(0.8)Y_(0.2)O_(2.9)–Ce_(0.8)Gd_(0.2)O_(1.9) Composite Electrolytes

作　　者：余守江[1] 熊月龙 牟雪萍[1] 彭开萍[1] 李晶[2] 

机构地区：[1]福州大学材料科学与工程学院,福州350116 [2]天津市检测技术研究所,天津300232

出　　处：《硅酸盐学报》2016年第4期487-492,共6页Journal of The Chinese Ceramic Society

摘　　要：采用溶胶―凝胶燃烧法制备BaCe_(0.8)Y_(0.2)O_(2.9)(BCY)和Ce_(0.8)Gd_(0.2)O_(1.9)(GDC)粉末,并通过机械混合法制备不同摩尔比的BCY―GDC复合电解质粉末,在1 450℃烧结5 h获得BCY―GDC复合电解质。研究了复合电解质的化学稳定性及电化学性能稳定性。结果表明:BCY–GDC复合电解质在CO_2和沸水中的稳定性均高于单相BCY;当BCY―GDC复合电解质中的BCY摩尔分数小于70%时,试样在CO_2气氛和沸水中都具有良好的化学稳定性。基于BCY:GDC摩尔比为1:1的BCY―GDC复合电解质的单电池,在700℃工作20 h内的最大功率密度的稳定性高于基于BCY电解质的单电池。The BaCe0.8Y0.2O2.9–Ce0.8Gd0.2O1.9 （BCY–GDC） composite electrolytes with different molar ratios were prepared a mechanically-mixing method using BCY and GDC powders prepared via a sol-gel combustion method, and were sintered in air at 1 450 oC for 5 h. The chemical stability and electrochemical properties of BCY–GDC composite electrolytes were investigated. The results show that the chemical stability of BCY–GDC composite electrolyte against CO2 and boiling water is better than that of the single phase BCY. The BCY–GDC composite electrolytes have a good chemical stability against CO2 and boiling water as the molar ratio of BCY is less than 70%. The single cell made from the BCY–GDC composite electrolyte with a BCY–GDC molar ratio 1：1 possesses better stability of the maximum power density than the cells with the BCY electrolyte at 700 oC for 20 h.

关 键 词：中温固体氧化物燃料电池 铈酸钡 钆掺杂氧化铈 复合电解质 化学稳定性 电化学性能 

分 类 号：TM911.4[电气工程—电力电子与电力传动]