Thermodynamics and Proton Transport in Nafion
- 1 January 2005
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 152 (3), E84-E89
- https://doi.org/10.1149/1.1855872
Abstract
A thermodynamic model is proposed to describe the sorption of water in Nafion based on the Flory-Huggins activity model and an appropriate osmotic pressure correction term for the chemical potential of water within the swollen membrane. The key variables for sorption are equivalent weight of ionomer, acid strength of the ionic groups, modulus of polymer elasticity, and interaction between water and polymer. The water uptake per unit mass of dry Nafion increases with the increasing acid strength of the functional groups, decreasing Young’s modulus, and decreasing equivalent weight of Nafion. The model provides insights into the sorption and swelling behavior of ion-exchange membranes, and thus, may be useful in evaluating and designing alternate proton-exchange membranes for fuel cell applications. In a companion paper (Part II), a predictive model is presented for the transport of protons in Nafion. © 2005 The Electrochemical Society. All rights reserved.Keywords
This publication has 43 references indexed in Scilit:
- Polymer Electrolytes Based on Ionomeric Copolymers of Ethylene with Fluorosulfonate Functionalized MonomersJournal of the Electrochemical Society, 2003
- Sorption in Proton-Exchange MembranesJournal of the Electrochemical Society, 2003
- Elastic energy in microscopically phase-separated swollen polymer networksPolymer, 2002
- Equilibrium and diffusion of methanol and water in a nafion 117 membraneAIChE Journal, 2000
- Modeling of Conductive Transport in Proton-Exchange Membranes for Fuel CellsJournal of the Electrochemical Society, 2000
- Thermodynamics of Water Vapor Uptake in Perfluorosulfonic Acid MembranesJournal of the Electrochemical Society, 1999
- Equilibrium Swelling of Highly Cross-Linked Polymeric ResinsIndustrial & Engineering Chemistry Research, 1994
- Experimental tests of entanglement models of rubber elasticity. 2. SwellingMacromolecules, 1984
- An investigation of ionic hydration effects in perfluorosulfonate ionomers by Fourier transform infrared spectroscopyJournal of the American Chemical Society, 1980
- Gibbs-Donnan Equilibria in Ion Exchange Resin SystemsJournal of the American Chemical Society, 1951