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, the authors investigated the transport mechanisms of ions and water molecules in perfluorosulfonated ionomer membranes, including Nafion, Aciplex, and Flemion types.
Abstract: To clarify transport mechanisms of ions and water molecules in perfluorosulfonated ionomer membranes, various membranes, such as one Nafion, two Aciplex, and four Flemion types, having different equivalent weight values (EW) were examined. H-, Li-, and Na-form samples were prepared for each membrane by immersion in 0.03 M HCl, LiCl, and NaCl aqueous solutions, and their properties in the fully hydrated state were investigated systematically. The water content of the membranes showed the tendency that the size and/or the number of ionic cluster region increases with decreasing EW value and the Li-form membranes have the most largely expanded ionic cluster regions. The ionic conductivity of the H-form membranes was considerably higher than that of the Li- and Na-form membranes. It was suggested that the proton in the membranes transports by the hopping mechanism and the Li+ and Na+ ions by the vehicle mechanism. In addition, the ionic conductivity of all membranes increased with increasing water content wit...
208 citations
TL;DR: In this article, Proton exchange membranes (PEM) have emerged as an essential factor in the technology race and have played an integral part in the success of recent work in portable, stationary and transportation applications.
207 citations
TL;DR: In this article, the authors investigated the transport properties of composite Nafion®-based membranes for direct methanol fuel cells (DMFC) and determined the influence of the thickness of the membrane on these properties.
206 citations
TL;DR: In this article, the morphology of PTFE and Nafion in a simulated catalyst layer is examined by scanning electron microscopy (SEM) and transmission electron microscope (TEM), and the results show that the platinum utilization of the thin-film catalyst layer containing only Pt/C and nafion is 45.4%.
206 citations
TL;DR: In this paper, the state of water in cast perfluorosulphonic Nafion films was investigated using Fourier transform infrared spectroscopy (FTIR), and it was shown that there is already a full proton transfer from the sulphonic acid group to the water molecule per sulphonate group.
206 citations