Topic
Nafion
About: Nafion is a research topic. Over the lifetime, 9110 publications have been published within this topic receiving 320865 citations.
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TL;DR: In this article, Nafion composite proton exchange membranes are prepared using mesoporous MCM-41 silica nanospheres as inorganic fillers, and the composite membrane containing I wt.% of fillers displays the best cell performance in direct methanol fuel cell tests.
106 citations
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TL;DR: In this paper, the authors used variable temperature, small-angle X-ray scattering (SAXS) to examine the thermal relaxation behavior of oriented Nafion films as a means to evaluate the morphological stability of this ionomer at elevated temperatures.
Abstract: The current study uses variable temperature, small-angle X-ray scattering (SAXS) to examine the thermal relaxation behavior of oriented Nafion films as a means to evaluate the morphological stability of this ionomer at elevated temperatures. The SAXS patterns of uniaxially oriented films are characterized by strong equatorial scattering peaks which are attributed to scattering arising from the oriented ionic domains (ionomer peak ca. q = 2 nm-1). The intensity of the equatorial peaksobtained from integration in the azimuthal direction (χ)and the degree of orientationcalculated using the Hermans orientation function (f)were monitored as a function of temperature. At lower temperatures, a constant value of f and a correlation between the β relaxation and a slight decrease in the scattering intensity of the equatorial peaks are in agreement with our earlier assignment of the β relaxation to the Tg of Nafion. At temperatures in the vicinity of the β relaxation, the static electrostatic network inhibits long-r...
106 citations
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TL;DR: In this paper, a physico-chemical investigation of the catalyst-Nafion interface of a direct methanol fuel cell (DMFC), based on a Pt-Ru/C anode catalyst, was carried out by XRD, SEM-EDAX and TEM.
105 citations
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TL;DR: In this paper, Nafion ® /montmorillonite (MMT) nanocomposite membranes were prepared to reduce methanol crossover while maintaining essential proton conductivity.
105 citations
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TL;DR: Alkaline anion-exchange membranes (AAEMs) are being developed for metal-cation-free solid alkaline fuel cells, and reduced solvent uptakes were observed after immersion in methanol, ethanol and ethylene glycol relative to a Nafion-115 proton-ex exchange membrane; this translated directly into lower alcohol permeabilities.
105 citations