Ion mobility in Nafion-117 membranes

Стенина, И. А.; Sistat, Philippe; Ребров, А. В.; Pourcelly, G.; Yaroslavtsev, A. B.

doi:10.1016/j.desal.2004.02.092

Cited by 141 publications

(128 citation statements)

References 14 publications

(18 reference statements)

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“…The fitting of the experimental data identified the following values for the transport number: t H+(N0) = 0.98 ± 0.02 and t H+(N1) = 0.96 ± 0.03. Note that the value of t H+ obtained for the Nafion-117 membrane was similar to that reported in the literature for this membrane and for Nafion-112, 48,49 which supports the adequacy of the electrochemical results obtained in this work with both samples.…”

Section: Electrochemical Characterizationsupporting

confidence: 79%

Chemical and electrochemical characterization of Nafion containing silver nanoparticles in a stripe-like distribution

et al. 2016

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The particular chemical structure of Nafion with nanostructured and segregated hydrophilic and hydrophobic domains enables its use as a model structure for the manufacture of polymer-metal nanocomposites. Among such nanocomposites, samples of Nafion-117 containing Ag-NPs of ca. 10 nm prepared by Intermatrix Synthesis exhibited a particular distribution in the form of stripes, a regular pattern that could reveal the real morphology of the polymer. To evaluate the potential application of this engineered material (e.g. in electrochemical devices), these new nanocomposite membranes were characterized by different techniques: microscopic, surface chemical analysis, mechanical and electrical/electrochemical. X-Ray (XRD and XPS) analyses combined with synchrotron experiments (XANES) were used to determine the chemical speciation of Ag in the membrane. Membrane potential and impedance spectroscopy measurements showed that such Ag-NPs did not hinder the diffusive transport of protons in the membrane bulk, moreover, they slightly reduced the electrical resistance in fully hydrated state samples. The mechanical evaluation of the nanocomposite evidenced the reduction of the elastic character when compared with the unmodified Nafion-117 sample.

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Section: Electrochemical Characterizationsupporting

confidence: 79%

Chemical and electrochemical characterization of Nafion containing silver nanoparticles in a stripe-like distribution

et al. 2016

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“…In the absence of glucose in the solution, the results obtained for solvent uptake are in agreement with previous results [37,40,41]. At a given electrolyte concentration, solvent uptake decreases when the ionic radius of the cation increases.…”

Section: Solvent Uptake and Surface Expansionsupporting

confidence: 81%

Chronopotentiometric study of a Nafion membrane in presence of glucose

Freijanes

Barragán

Muñoz

2016

Journal of Membrane Science

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“…It shows that there are some differences among the values measured by different researchers and methods. However, the order of magnitude of d I I for Na + is about 1 × 10 −10 (m 2 /s), 41,42 and that of d W W is about 3 × 10 −10 (m 2 /s) 39,[43][44][45] in saturated Na + type Nafion-117 membrane.…”

Section: B Improved Np Equation Modelmentioning

confidence: 99%

Dynamic model of ion and water transport in ionic polymer-metal composites

et al. 2011

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In the process of electro-mechanical transduction of ionic polymer-metal composites (IPMCs), the transport of ion and water molecule plays an important role. In this paper, the theoretical transport models of IPMCs are critically reviewed, with particular emphasis on the recent developments in the latest decade. The models can be divided into three classes, thermodynamics of irreversible process model, frictional model and Nernst-Planck (NP) equation model. To some extent the three models can be transformed into each other, but their differences are also obvious arising from the various mechanisms that considered in different models. The transport of ion and water molecule in IPMCs is compared with that in membrane electrode assembly and electrodialysis membrane to identify and clarify the fundamental transport mechanisms in IPMCs. And an improved transport model is proposed and simplified for numerical analysis. The model considers the convection effect rather than the diffusion as the major transport mechanism, and both the self-diffusion and the electroosmosis drag are accounted for in the water flux equation

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Ion mobility in Nafion-117 membranes

Cited by 141 publications

References 14 publications

Chemical and electrochemical characterization of Nafion containing silver nanoparticles in a stripe-like distribution

Chemical and electrochemical characterization of Nafion containing silver nanoparticles in a stripe-like distribution

Chronopotentiometric study of a Nafion membrane in presence of glucose

Dynamic model of ion and water transport in ionic polymer-metal composites

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