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, a thin dense skin, consisting primarily of Nafion ionomer, formed on the outer surface of the catalyst layer of the completed membrane electrode assemblies (MEA) was found to diminish the performance of the fuel cell in the mass-transport region of the polarization curve.
Abstract: Further characterization of the catalyst layer of membrane electrode assemblies (MEAs) prepared by the standard decal/hot-press-transfer method was carried out using atomic force microscopy and scanning electron microscopy coupled with energy-dispersive X-ray analysis. It was discovered that a thin dense skin, consisting primarily of Nafion ionomer, formed on the outer surface of the catalyst layer of the completed MEA. The mechanism of the skin formation was attributed to the interaction between the dissolved ionomer in the catalyst ink solution and the hydrophobic Teflon decal surface during the decal fabrication process. The presence of a skin on the catalyst layer was found to diminish the performance of the fuel cell in the mass-transport region of the polarization curve. This suggested a slow rate of diffusion of oxygen through the skin. Removal of water formed in the cathode reaction would be expected to be slowed by the skin as well, leading to potential flooding of the cell at higher current densities. Modifications to the decal preparation procedure to prevent skin formation on the MEA catalyst layer include: use of a decal substrate with a less hydrophobic surface than Teflon, use of a single rather than multiple ink applications, and elimination of hydrophobic lubricants. The reduction/elimination of the skin results in significant improvement in performance in the high current region of the polarization curve.
89 citations
TL;DR: An electroactive artificial muscle based on the fullerene-reinforced ionic polymer membrane was developed to overcome some of the drawbacks of traditional ionic polymers and metal composite actuators as discussed by the authors.
89 citations
TL;DR: It is highly expected that the strong coupling effect between organic and inorganic materials will provide new routes to advance PEC water splitting.
Abstract: Strongly coupled Nafion molecules and ordered porous CdS networks are fabricated for visible-light photoelectrochemical (PEC) hydrogen evolution. The Nafion layer coating shifts the band position of CdS upward and accelerates charge transfer in the photoelectrode/electrolyte interface. It is highly expected that the strong coupling effect between organic and inorganic materials will provide new routes to advance PEC water splitting.
89 citations
TL;DR: A series of hydrocarbon membranes consisting of poly(vinyl alcohol) (PVA), sulfosuccinic acid (SSA), and polyvinyl pyrrolidone (PVP) (SIPN-20) were synthesized and characterized for direct methanol fuel cell (DMFC) applications.
88 citations
TL;DR: Preliminary studies of cellular NO release from Rhodobacter sphaeroides bacterial cells with excellent results are carried out.
Abstract: Nitric oxide can be electrocatalytically reduced at electrodes modified with electropolymerized films of [Cr(v-tpy)2]3+. Upon further modification with a thin film of Nafion (to prevent interferences from anions, especially nitrite), these electrodes can be employed as NO sensors in solution with submicromolar detection limits and fast response. We have carried out preliminary studies of cellular NO release from Rhodobacter sphaeroides bacterial cells with excellent results.
88 citations