کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7713846 | 1497431 | 2015 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
An NMR study on the molecular dynamic and exchange effects in composite Nafion/sulfated titania membranes for PEMFCs
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: An NMR study on the molecular dynamic and exchange effects in composite Nafion/sulfated titania membranes for PEMFCs An NMR study on the molecular dynamic and exchange effects in composite Nafion/sulfated titania membranes for PEMFCs](/preview/png/7713846.png)
چکیده انگلیسی
In this work, self-diffusion coefficients data were interpreted in terms of a simple “two-sites” model involving exchange between relatively bound and mobile water sites to discuss the nature of water dynamics and the state(s) of the water (bound and free states) both inside composite and filler-free membranes, as well as its interaction with the hydrophilic polymer sites and particles surface. A quantitative analysis was elaborated to estimate the number of water molecules involved in the hydration shell of the hydrophilic groups of both polymer and filler, as function of the membrane water content. Despite the simplicity of this “bound/free water exchange” model, we obtain consistent values corresponding to about thirteen water molecules per sulfonic group.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 40, Issue 42, 9 November 2015, Pages 14651-14660
Journal: International Journal of Hydrogen Energy - Volume 40, Issue 42, 9 November 2015, Pages 14651-14660
نویسندگان
Isabella Nicotera, Vasiliki Kosma, Cataldo Simari, Giuseppe A. Ranieri, Mirko Sgambetterra, Stefania Panero, Maria Assunta Navarra,