Ions and water transport across charged nafion membranes. Irreversible thermodynamics approach

Narȩbska, Ånna; Koter, Stanisław; Kujawski, Wojciech

doi:10.1016/0011-9164(84)85048-1

Cited by 62 publications

(45 citation statements)

References 14 publications

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“…104 As a final check, ␣ L at ambient conditions for a completely liquid-equilibrated membrane is calculated and compared to the results of Narebska et al 105 Their results and Eq. 104 As a final check, ␣ L at ambient conditions for a completely liquid-equilibrated membrane is calculated and compared to the results of Narebska et al 105 Their results and Eq.…”

Section: Journal Of the Electrochemical Society 151 ͑2͒ A311-a325 ͑2mentioning

confidence: 99%

Transport in Polymer-Electrolyte Membranes

Weber

Newman

2004

J. Electrochem. Soc.

448

478

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A mathematical model is developed that is based on our previous physical model. The governing equations are presented for both the vapor-and liquid-equilibrated transport modes as well as when they both occur. Thus, this model bridges the gap between the one-phase and two-phase macroscopic models currently used in the literature. In addition to being able to model such phenomena as Schroeder's paradox, the model incorporates other relatively novel features including the effect of temperature on water uptake by the membrane from water vapor, and its associated effects on transport properties. Just as in the physical model, the mathematical model uses the wealth of knowledge contained in the literature to examine and determine values for the relevant transport and membrane parameters. This also helps in corroborating the physical model. The mathematical model developed is further validated and its results examined in a subsequent paper where it is placed in a simple fuel-cell model.

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Section: Journal Of the Electrochemical Society 151 ͑2͒ A311-a325 ͑2mentioning

confidence: 99%

Transport in Polymer-Electrolyte Membranes

Weber

Newman

2004

J. Electrochem. Soc.

448

478

View full text Add to dashboard Cite

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“…First, the exchange of protons for sodium ions lowers λ and thus φ h due to the lower hydration number of Na + . In addition, λ further decreases with increasing NaCl s C (so-called osmotic de-swelling), resulting in higher , h A C narrower ion channels, increased tortuosity and stiffening of the polymer chains (Narebska et al 1984, Cwirco and Carbonell 1992a,b, Lehmani et al 1997. The dielectric constant in the membrane will change, too, affecting K 0 .…”

Section: Salt Transport In Nafionmentioning

confidence: 99%

Understanding methods of preparation and characterization of pore-filling polymer composites for proton exchange membranes: a beginner’s guide

Gloukhovski

Freger

Tsur

2017

Reviews in Chemical Engineering

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Abstract Composite membranes based on porous support membranes filled with a proton-conducting polymer appear to be a promising approach to develop novel proton exchange membranes (PEMs). It allows optimization of the properties of the filler and the matrix separately, e.g. for maximal conductivity of the former and maximal physical strength of the latter. In addition, the confinement itself can alter the properties of the filling ionomer, e.g. toward higher conductivity and selectivity due to alignment and restricted swelling. This article reviews the literature on PEMs prepared by filling of submicron and nanometric size pores with Nafion and other proton-conductive polymers. PEMs based on alternating perfluorinated and non-perfluorinated polymer systems and incorporation of fillers are briefly discussed too, as they share some structure/transport relationships with the pore-filling PEMs. We also review here the background knowledge on structural and transport properties of Nafion and proton-conducting polymers in general, as well as experimental methods concerned with preparation and characterization of pore-filling membranes. Such information will be useful for preparing next-generation composite membranes, which will allow maximal utilization of beneficial characteristics of polymeric proton conductors and understanding the complicated structure/transport relationships in the pore-filling composite PEMs.

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“…Our mol, the following relationship is obtained from Eqs. [2], results show that the electroosmotic permeability may in- [3], and [4]: crease or decrease with the temperature depending on the temperature range considered as well as on the other established experimental conditions, particularly concentration…”

Section: Introductionmentioning

confidence: 95%

“…Most of the scarce references found Taking into account the volume change due to the electrochemical reactions at the Ag/AgCl electrodes, the volume in the literature state that the electroosmotic permeability increases when the temperature increases (9-11), but some change rates of the cathodic and anodic compartments, DV c and DV a , respectively, are given by authors also obtain a slight decrease with the temperature (12). However, in these works the dependence of the water electroosmotic transport on the temperature is not studied in [3] depth, and the manner of this dependence is not very clear.…”

Section: Introductionmentioning

confidence: 95%

“…This phenomenon is known as elecnamely, the existence of a local maximum in the (I, W ) troosmosis and has been widely studied in the literature, curves at a determined value of the current density. The specially within the framework of the thermodynamics of value of the current density for which the local maximum irreversible processes (1)(2)(3). The relation between the total in the (I, W ) curves occurs, I M , is, in all cases, very close volume flux passing through the membrane, J V , and the cur-to the limiting current density value, I L , obtained under the rent density, I, in the absence of a hydraulic pressure differ-same experimental conditions from the current-voltage ence, DP Å 0, is called apparent or measured electroosmotic curves (V, I), i.e., I L á I M .…”

Section: Introductionmentioning

confidence: 99%

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