کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
638387 | 1456168 | 2007 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Hybrid materials for polymer electrolyte membrane fuel cells: Water uptake, mechanical and transport properties
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The water uptake, transport and mechanical properties of organic-inorganic hybrid materials based on sulfonated and silylated, cross-linked polyetheretherketone (called SOSi-PEEK/N, where N is the molar percentage of silylated monomeric units) for application in fuel cells are reported. The mechanical properties are superior to those of S-PEEK, due to the presence of silicon. The water and proton diffusion coefficients are reported as function of temperature and relative humidity. The proton conductivity of the membranes increases nearly four orders of magnitude when relative humidity varies from 30% to 100% corresponding to an increase of water/equivalent of ion-exchange groups, λ, from 1 to 15. The activation energy for proton conduction is slightly higher than in Nafion. Proton diffusion coefficients obtained from the Nernst-Einstein equation are compared with water chemical diffusion coefficients determined from water sorption kinetics. The equivalence of both quantities for λ â¥Â 4 indicates that proton conductivity takes place via Grotthuss-type mechanism.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Membrane Science - Volume 304, Issues 1â2, 1 November 2007, Pages 76-81
Journal: Journal of Membrane Science - Volume 304, Issues 1â2, 1 November 2007, Pages 76-81
نویسندگان
M.L. Di Vona, D. Marani, A. D'Epifanio, S. Licoccia, I. Beurroies, R. Denoyel, P. Knauth,