کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5150279 1498232 2017 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structural and electrical properties of Bi3Y0.9W0.1O6.15-La0.8Sr0.2MnO3 (BiYWO-LSM) composites
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Structural and electrical properties of Bi3Y0.9W0.1O6.15-La0.8Sr0.2MnO3 (BiYWO-LSM) composites
چکیده انگلیسی
Electrical conductivity and structural behavior in Bi3Y0.9W0.1O6.15-La0.8Sr0.2MnO3 (BiYWO-LSM) composite cathodes for intermediate temperature solid-oxide fuel cells (IT-SOFCs) have been investigated. The ionically conducting component (BiYWO) was selected as it not only exhibits high oxide ion conductivity at intermediate temperatures, but also shows good long-term stability. The LSM component is a well-known electronic conductor, commonly used for SOFC cathodes and also shows high interfacial polarization effects. Both composite components exhibit similar thermal expansion coefficients. Composites of different molar ratios of components were prepared by sintering the components together at 850 °C. Electrical behavior was studied by a.c. impedance spectroscopy and transference number measurements were used to determine the ionic and electronic contributions to total conductivity. Percolation type behavior was observed for total conductivity and the percolation threshold value was determined to be in the bismuth rich region of the compositional range, due to the significant difference in the grain sizes of the two components. Ionic and electronic components of the total conductivity at, above and below the percolation threshold are discussed. Stability measurements on a composition close to the percolation threshold show some degree of conductivity decay on prolonged annealing at 650 °C, which is partly recoverable on heating to higher temperatures.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 311, 15 November 2017, Pages 14-19
نویسندگان
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