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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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Journal ArticleDOI
TL;DR: The most surprising aspect of this study was the formation of membrane-derived radical species only in the neutralized membranes, and even in the absence of H2O2 in the case of Nafion/Cu(II) and Nafions/Fe(III).
Abstract: Electron spin resonance (ESR) spectroscopy was used to detect and identify radicals formed by UV irradiation of Nafion and Dow perfluorinated membranes partially or fully neutralized by Cu(II), Fe(II), and Fe(III). This method allowed the monitoring of ESR signals from the paramagnetic counterions together with the appearance of membrane-derived radical species. The most surprising aspect of this study was the formation of membrane-derived radical species only in the neutralized membranes, and even in the absence of H2O2 in the case of Nafion/Cu(II) and Nafion/Fe(III). In Nafion/Cu(II), ESR spectra from radicals exhibiting hyperfine interactions with three equivalent 19F nuclei (the “quartet”) and with four equivalent 19F nuclei (the “quintet”) were detected. In Nafion/Fe(II) exposed to H2O2 solutions, the formation of Fe(III) was detected. Upon UV irradiation, strong signals from the chain-end radical ROCF2CF2• were detected first, followed by the appearance, upon annealing above 200 K, of the quartet si...

104 citations

Journal ArticleDOI
16 Jan 2009-Polymer
TL;DR: In this article, the relationship between morphology and proton conduction for Nafion membranes and hydrocarbon-type proton exchange membranes was investigated by small-angle X-ray scattering (SAXS) and atomic force microscopy (AFM).

104 citations

Journal ArticleDOI
TL;DR: In this article, a sulfonated polyetheretherketones (PEEK-WC) with various degrees of substitution (DS) was prepared and then characterized by FT-IR analyses.

104 citations

Journal ArticleDOI
TL;DR: In this article, the state-of-the-art and progress on polymer electrolyte membranes engineered using graphene and graphene oxide, as well as their synthesis routes and the influence on the performance are discussed.
Abstract: The proton exchange membrane fuel cell (PEMFC) converts chemical energy into electrical energy via electrochemical reaction between hydrogen and oxygen, with heat and water as byproducts. When a PEMFC is engineered with polymer electrolyte membrane, e.g., Nafion and polybenzimidazole (PBI), it helps to enhance the performance of the fuel cell under monitored environmental conditions, i.e., high proton conductivity, improved electrode kinetics, and tailoring of properties, along with low tolerance for carbon monoxide. Recently discovered “graphene” has enticed the scientific community, because of its exceptional properties. As per the literature, PEMFCs engineered with graphene can yield high power density, along with 38% enhanced current density, and 257% improved ionic conductivity. In this context, the present review gives the state-of-the-art and progress on polymer electrolyte membranes engineered using graphene and graphene oxide, as well as their synthesis routes and the influence on the performance...

104 citations

Journal ArticleDOI
TL;DR: In this article, the surface morphology of the electrodeposited nanostructured Pt was uneven presumably due to the preferential growth of such nanocrystallites in certain crystallographic directions.

104 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023253
2022503
2021338
2020367
2019386
2018393