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Influence of Lithium Oxide Addition on the Sintering Behavior and Electrical Conductivity of Gadolinia Doped Ceria

查看全文 作　　者：Minfang Han Ze Liu Su Zhou Lian [1]Yu 高影响力作者 机构地区：[1]Union Research Center of Fuel Cell, School of Chemical & Environment Engineering, University of Mining & Technology(CUMTB), Beijing 100083, China高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2011年第27卷第5期,共5页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China (Grant No. 50730004);the Ministry of Science and Technology of the People’s Republic of China (No. 2009DFA6136) 摘　　要：Ceria-based electrolytes have been widely researched in intermediate-temperature solid oxide fuel cell (SOFC), which might be operated at 500-600?C. Sintering behavior with lithium oxide as sintering additive and electrical conductivity of gadolinia doped ceria (Gd0.1Ce0.9O2δ, GDC10) electrolyte was studied in this paper by X-ray di?raction (XRD), scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS). As the results, the fully dense GDC10 electrolytes are obtained at a low temperature of 800?C with 2.5 mol% Li2O as sintering additive (called 5LiGDC800). During sintering process, lithium oxides adsorbed by around GDC10 surface help to sinter at 800?C and are kept at the grain boundary of GDC10 in the end. The fine grains of 100-400 nm and high electrical conductivity of 0.014 S/cm at 6000C in 5LiGDC800 were achieved, which contributed to the lower sintering temperature and enhanced grain boundary conductivity, respectively. Lithium, staying at grain boundary, reduces the depletion of oxygen vacancies in the space charge layers and increases the oxygen vacancy concentration in the grain boundary, which leads to improve the total electrical conductivity of 5LiGDC800. 关 键 词：烧结行为 高电导率 氧化铈 氧化锂 中温固体氧化物燃料电池 掺杂 扫描电子显微镜 电化学阻抗谱
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