Journal ArticleDOI
Development of a space‐charge transport model for ion‐exchange membranes
Reads0
Chats0
TLDR
In this paper, a two-dimensional electrokinetic transport model that incorporates ionic hydration, orientation of solvent molecules by an applied electric field, and solvent dipole-dipole interactions is developed.Abstract:
A two-dimensional, electrokinetic transport model that incorporates ionic hydration, orientation of solvent molecules by an applied electric field, and solvent dipole-dipole interactions is developed. The model is used to simulate equilibrium and transport experiments for perfluorosulfonic acid membranes containing aqueous alkali metal sulfate solutions. The membrane is modeled as an array of cylindrical pores. Solution of the mathematical model requires that the membrane porosity, water partition coefficient, coion partition coefficient, water diffusion coefficients, and coion and counterion diffusion coefficients be known. Membrane coion and counterion diffusion coefficients were determined from free solution equivalent conductance data. All other parameters were determined experimentally for a Nafion (of E. I. du Pont de Nemours Inc.) cation-exchange membrane and five 0.1 M alkali metal sulfate solutions. Experimental radiotracer data for coion absorption as well as for coion and water transport are compared with theoretical predictions to test the accuracy of the model.read more
Citations
More filters
Journal ArticleDOI
Review of the proton exchange membranes for fuel cell applications
TL;DR: In this article, the authors present an overview of the key requirements for the proton exchange membranes (PEM) used in fuel cell applications, along with a description of the membrane materials currently being used and their ability to meet these requirements.
Journal ArticleDOI
Modeling transport in polymer-electrolyte fuel cells.
Adam Z. Weber,John Newman +1 more
TL;DR: This review has highlighted the important effects that should be modeled and shown the vast complexities of transport within polymer-electrolyte fuel cells and the various ways they have been and can be modeled.
Journal ArticleDOI
Modelling the performance of membrane nanofiltration - critical assessment and model development
TL;DR: A two-parameter model (pore radius and membrane charge) for electrolyte rejection has been developed that includes dielectric exclusion in the form of an energy barrier to ion partitioning into the pores that confirms that uncharged solute rejection in nanofiltration membranes may be well-described by such a continuum model.
Journal ArticleDOI
Transport in Polymer-Electrolyte Membranes I. Physical Model
Adam Z. Weber,John Newman +1 more
TL;DR: In this paper, a physical model of polyelectrolyte membranes is developed that is semiphenomenological and takes into account Schroeder's paradox, and two different transport mechanisms are presented and discussed.
Journal ArticleDOI
Thermodynamics and Proton Transport in Nafion: II. Proton Diffusion Mechanisms and Conductivity
TL;DR: In this paper, a comprehensive pore transport model is proposed to describe proton diffusion within Nafion at various hydration levels by incorporating effects of water uptake and various proton transport mechanisms, namely, proton hopping along surface, Grotthuss diffusion, and ordinary mass diffusion of hydronium ions.
Related Papers (5)
Ion and Solvent Transport in Ion‐Exchange Membranes I . A Macrohomogeneous Mathematical Model
Mark W. Verbrugge,Robert F. Hill +1 more