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 paper, a method for the synthesis of phenyl phosphonic acid functionalized poly[aryloxyphosphazene] membranes is described, which have proton conductivities between 10 −2 and 10 −1 ǫ s−cm −1.
157 citations
TL;DR: In this paper, Nafion®/Laponite nanocomposite membranes for proton exchange membrane fuel cells (PEMFC) were studied and the influence of temperature and relative humidity on the proton conduction of the nanocomposition membranes was studied.
157 citations
TL;DR: In this article, a 2700 h life test of a single proton exchange membrane fuel cell (PEMFC) with Nafion 112 membrane under nonsaturated humidification was conducted, where in situ measurements of hydrogen crossover rate through the membrane and electrochemical active surface area (EAS) of Pt catalyst, in combination with cell polarization curves, were applied to investigate the degradation mechanism.
Abstract: A 2700 h life test of a single proton exchange membrane fuel cell (PEMFC) with Nafion 112 membrane under nonsaturated humidification was conducted. In situ measurements of hydrogen crossover rate through the membrane and electrochemical active surface area (EAS) of Pt catalyst, in combination with cell polarization curves, were applied to investigate the degradation mechanism. A slow decrease of the EAS of Pt catalyst from 400 to 1900 h running was found to cause a slight voltage decay only at high current densities. However, a subsequent dramatic degradation of the membrane results in an accelerated collapse of the fuel cell.
157 citations
TL;DR: In this paper, the electrospinning performance and solution properties of Nafion and its blend with another polyelectrolyte, poly(acrylic acid) (PAA), were investigated.
Abstract: In this study, the electrospinning performance and solution properties of Nafion and its blend with another polyelectrolyte, poly(acrylic acid) (PAA), were investigated. Attempts to electrospin pure Nafion at various polymer concentrations (5−35 wt %), solvents, neutralization, and electrospinning conditions resulted in electrospraying rather than electrospinning. However, a polymer solution blend (5 wt %) of Nafion and PAA resulted in beaded fibers at 8 wt % PAA and smooth electrospinning above 12% PAA. Fiber sizes of the blend increased from 90 to 600 nm with increasing PAA content. Dynamic light scattering on pure Nafion solutions in various solvents reveals large aggregates (i.e., dispersion) of various sizes due to polymer backbone and ionic interactions. The lack of sufficient polymer chain entanglement evidenced by low viscosity and aggregate formation in Nafion solutions prohibits fiber formation during electrospinning. The addition of PAA to Nafion modifies the ionic strength of the solvent resul...
156 citations
TL;DR: In this paper, the performance of a direct methanol fuel cell based on a polymer electrolyte membrane electrolyte was investigated, and the performance was enhanced by increasing cell temperature.
156 citations