期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 27, 期 5, 页码 460-464出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/S1005-0302(11)60091-1
关键词
Gadolinia doped ceria; Sintering additive; Electrical conductivity
资金
- National Natural Science Foundation of China [50730004]
- Ministry of Science and Technology of the People's Republic of China [2009DFA6136]
Ceria-based electrolytes have been widely researched in intermediate-temperature solid oxide fuel cell (SOFC), which might be operated at 500-600 degrees C. Sintering behavior with lithium oxide as sintering additive and electrical conductivity of gadolinia doped ceria (Gd0.1Ce0.9O2-delta, GDC10) electrolyte was studied in this paper by X-ray diffraction (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 degrees 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 degrees 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 600 degrees C 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.
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