کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9761809 | 1498429 | 2005 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Oxygen self-diffusion through fine-grained polycrystalline films into single crystalline substrates-a mathematical description
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Interface exchange limited transport of oxygen through a polycrystalline film into a substrate with a higher oxygen diffusivity is characteristic for mixed ionic and electronic conductor (MIEC) electrode films on ionic conductors in solid oxide fuel cells. Such films can generally be approximately represented as a homogeneous medium with some effective diffusivity (type A regime), so that the mathematical description of the oxygen diffusion in such films is significantly simplified. In this paper, we present the solution of the diffusion equations in a film/substrate system with the practically important boundary conditions that the oxygen exchange is limited at the gas/film and at the film/substrate interface. Furthermore, we will derive an approximate solution that simplifies the evaluation of the interface exchange coefficients from oxygen isotope exchange depth profile experiments.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 176, Issues 1â2, 14 January 2005, Pages 61-72
Journal: Solid State Ionics - Volume 176, Issues 1â2, 14 January 2005, Pages 61-72
نویسندگان
P. Fielitz, Chr. Argirusis, G. Borchardt,