کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1626994 1516445 2007 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Study on La and Y co-doped ceria-based electrolyte materials
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Study on La and Y co-doped ceria-based electrolyte materials
چکیده انگلیسی

Co-doped ceria electrolytes of Ce0.8La0.2−xYxO1.9 (x = 0.02, 0.06, 0.10, 0.14, 0.20) fine powders were prepared with the sol–gel method. The results of X-ray diffraction and Raman spectroscopy showed that all powders crystallite calcined at 800 °C were single phase with cubic fluorite structure, the average crystallite sizes calculated by the Scherrer formula were between 27 and 34 nm, which was in good agreement with the results of TEM and particle size distribution measurements. The thermal expansion curves of Ce0.8La0.2−xYxO1.9Ce0.8La0.2−xYxO1.9 were measured and the thermal expansion coefficients (TEC) between 100 and 800 °C were calculated. For the samples of Ce0.8La0.2−xYxO1.9, in the temperature range of 700–850 °C, when x = 0.06, 0.10 and 0.14, much higher ionic conductivity was observed than those of the singly doped ceria with same dopant concentration (20% trivalent rare earth) and when x = 0.06, maximal conductivity is obtained. It suggested that co-doping with appropriate ratio of lanthanum and yttrium can further improve the electrical performance of ceria-based electrolytes, and these co-doped samples may be the better electrolytes for intermediate-temperature solid oxide fuel cells.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 428, Issues 1–2, 31 January 2007, Pages 59–64
نویسندگان
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