کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9760169 | 1498042 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Membrane electrode assemblies based on sol-gel hybrid membranes - A preliminary investigation on fabrication aspects
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
This paper reports the preliminary results on fabrication of membrane electrode assemblies (MEA) for proton exchange membrane fuel cells (PEMFC) based on sol-gel hybrid membranes. In order to identify a suitable method, various fabrication strategies were investigated. For this purpose, hybrid membranes made from alkoxysilane-endcapped poly(ethylene glycol) (PEG) precursor consisting of monophenyl trimethoxysilane (MPh) as silica phase modifier and 4-dodecylbenzene sulfonic acid (DBSA) as proton source (PEG/SiO2/DBSA); and MPh and 12-phosphotungstic acid (PWA) (PEG/SiO2/PWA) are used as model compounds. For the better interface of MEA, impregnation solutions of similar chemical nature with hybrid membranes were examined. Polarization curves are exclusively used to evaluate the quality of MEA. A maximum current density of 80Â mAÂ cmâ2, obtained with hot-pressed MEA, is the highest performance among the five different preparation methods. Good contact between the hybrid membrane as an electrolyte and the catalyst coated carbon cloth as electrodes in the MEA is achieved by coating electrodes as well as membrane with precursor sol. The flexibility of sol-gel hybrid membranes shows scope for further improvement in performance compared to hybrid membranes from solution-blending. The implications of each preparation methods are analyzed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 150, 4 October 2005, Pages 48-56
Journal: Journal of Power Sources - Volume 150, 4 October 2005, Pages 48-56
نویسندگان
R. Thangamuthu, C.W. Lin,