توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱High temperature proton exchange membrane fuel cells: Advantages and technical challenges
اطلاعات انتشار: دومین همایش پیل سوختی ایران، سال
تعداد صفحات: ۴
High temperature proton exchange membrane fuel cells (HT–PEMFC) have attracted great interests in recent years due to their advantages compared with common PEMFC. PEM fuel cells based on perfluorinated membrane electrolytes operate in the temperature range between 60 and 80°C while elevating the operating temperature (up to 200°C) provide improved carbon monoxide tolerance, faster electrode kinetics, simpler thermal and water management and more efficient recovery of waste heat as a practical energy source. In this investigation the drivers behind the interest in HT–PEMFCs and the challenges in developing novel materials for membranes preparation is reviewed. Also a brief analysis of emperature requirements for CO tolerance is presented. The research shows an exhaustive presentation and comparative discussions on various types of high temperature membranes. Finally, the importance of porosity in electrodes for HT–PEM has been studied.<\div>

۲Morphological investigation of Nafion\TiO2 nanocomposite membranes of PEM Fuel Cell
نویسنده(ها): ، ، ،
اطلاعات انتشار: ششمین کنگره بین المللی مهندسی شیمی، سال
تعداد صفحات: ۶
Effect of morphology on the water uptake of proton exchange composite membranes, which are used in proton exchange membrane (PEM) fuel cells, were investigated in this study. Nafion\TiO2 nanocomposite membranes have been prepared by in–situ sol–gel and casting methods. For sol–gel method, preformed Nafion membranes were soaked in tetrabutylortotitanate (TBT) and methanol solution. Different reaction time causes production of different amount of titanium dioxide particles by the in–situ sol–gel inside the cluster of Nafion. In order to compare synthesis methods, a Nafion–TiO2 composite membrane is fabricated with 3%wt of TiO2 particles by the solution casting method. The membranes were characterized using Scanning Electron Microscopy (SEM), Energy Dispersive X–Ray Analysis (EDXA) and for the water uptake. X–Ray spectra of the composite membranes indicate presence of TiO2 in the modified membranes. In case of a same doping level, sol–gel method produces more uniform distribution of Ti particles in Nafion\TiO2 composite membrane than the casting method. Water uptake of Nafion\TiO2 membrane with 3% of doping level is 51% higher than that of the pure Nafion membrane. Among the nanocomposite membranes, the sample with 2–3wt % of TiO2 content exhibits no agglomeration of particles but higher water uptake.<\div>
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