固相反应后复合电解质BaCe_(0.8)Y_(0.2)O_(2.9)-Ce_(0.8)Gd_(0.2)O_(1.9)的化学稳定性研究  

Study on Chemical Stability of BaCe_(0.8)Y_(0.2)O_(2.9)-Ce_(0.8)Gd_(0.2)O_(1.9) Composite Electrolytes after Solid-state Reaction

作　　者：肖祯照 许聪颖[1] 余守江[1] 彭开萍[1] 

机构地区：[1]福州大学材料科学与工程学院,福州350116

出　　处：《人工晶体学报》2016年第6期1549-1554,共6页Journal of Synthetic Crystals

基　　金：福州大学"福建省大学生创新创业训练计划"(201410386085)

摘　　要：采用溶胶-凝胶燃烧法和机械混合法制备摩尔比为1∶1的BaCe_(0.8)Y_(0.2)O_(2.9)(BCY)-Ce_(0.8)Gd_(0.2)O_(1.9)(GDC)复合粉末,并在1550℃烧结保温5 h获得复合电解质片。对BCY-GDC复合电解质的化学稳定性以及电化学性能稳定性进行研究。结果表明:BCY-GDC复合电解质在1550℃烧结时会发生固相反应,形成以BaCe_(1-x-y)Gd_xY_yO_(3-α)相为主的显微组织。固相反应后的BCY-GDC复合电解质在700℃3%CO_2和沸水中的稳定性高于单相BCY;基于固相反应后BCY-GDC复合电解质的单电池在700℃下20 h测试时间内的开路电压以及最大功率密度的稳定性均高于相同条件下BCY电解质的单电池。BaCe（0.8）Y（0.2）O（2.9）-Ce（0.8）Gd（0.2）O（1.9）（ BCY-GDC,molar ratio 1 ∶ 1） composite electrolytes were prepared via sol-gel combustion method and mechanically-mixing method. The BCY-GDC pellets were sintered in air at 1550 ℃ for 5 h. The chemical stability and electrochemical properties of BCY-GDC composite electrolyte were investigated. The results show that BCY-GDC composite electrolyte sintered at1550 ℃ promote the solid-state reaction between BCY and GDC,then produce a perovskite phase of BaCe（1-x-y）GdxYyO3-α. The chemical stability against 3% CO2 at the temperature of 700 ℃ and boiling water of the BCY-GDC pellet after solid-state reaction is higher than that of the single phase BCY. The single cell with BCY-GDC composite electrolyte after solid-state reaction also shows a better stability of the open circuit voltage and max power density than that of the cells with the BCY electrolyte at 700 ℃ for 20 h.

关 键 词：固体氧化物燃料电池 BaCe0.8Y0.2O2.9-Ce0.8Gd0.2O1.9 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]