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Cited by 490Fuel Cells and Related MaterialsMembrane-based Ion Separation TechniquesMembrane Separation and Gas Transport

Methanol Transport Through Nation Membranes. Electro-osmotic Drag Effects on Potential Step Measurements

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Ren, Xiaoming, Springer, Thomas E., Zawodzinski, Thomas A., Gottesfeld, Shimshon·2000·Journal of The Electrochemical Society
DOI 10.1149/1.1393219
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Abstract

This paper describes methanol flux measurements across Nafion, 1100 equivalent weight membranes under conditions of a direct methanol fuel cell but in which methanol is completely electro‐oxidized on the opposite side in an inert atmosphere at sufficiently high electrode potential. Both the diffusion coefficient and the methanol concentration in the membrane were determined from the measured transient limiting current density following a potential step. Corrections for electro‐osmotic drag effects are developed and found necessary even for low MeOH concentrations. The results agree well with those obtained from nuclear magnetic resonance measurements. The partition coefficient was approximately constant for the membranes in contact with methanol solutions of various concentration and from room temperature to 90°C. The activation energy of methanol diffusion in a fully hydrated Nafion membrane between 30 and 130°C is , and that for protonic conduction under the same conditions is . For a membrane dried in vacuum at above 100°C, lower values of methanol permeation rate and protonic conductance were found. © 2000 The Electrochemical Society. All rights reserved.

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Authors
Ren, X., Springer, T. E., Zawodzinski, T. A., & Gottesfeld, S.
Affiliations
Los Alamos National Laboratory (US)
ORCID
Venue
Journal of The Electrochemical Society
Publisher
The Electrochemical Society
Published
2000
Volume
147
Issue
2
Pages
466
ISSN
0013-4651 (ISSN-L)
DOI
10.1149/1.1393219
OpenAlex
W2116451258
Semantic Scholar
b513cf911b8cdfc992cdf8fc0163e9c4665e3e82
Cited by
490
References
0
Citations by year
2026: 4 · 2025: 3 · 2024: 3 · 2023: 9 · 2022: 4 · 2021: 5 · 2020: 8 · 2019: 9 · 2018: 10 · 2017: 10 · 2016: 12 · 2015: 20 · 2014: 20 · 2013: 15 · 2012: 27
FWCI
11.22
Type
journal article
Language
en
Open access
Locations
Journal of The Electrochemical Society (publishedVersion)
Funders
  • U.S. Department of Energy
  • Los Alamos National Laboratory
Topics
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Fuel Cells and Related Materials
  • Physical Sciences › Engineering › Biomedical Engineering › Membrane-based Ion Separation Techniques
  • Physical Sciences › Engineering › Mechanical Engineering › Membrane Separation and Gas Transport
Keywords
methanol transport, Nafion membrane, direct methanol fuel cells, electro-osmotic drag, methanol diffusion coefficient, partition coefficient, diffusion activation energy, proton conduction, membrane dehydration, methanol crossover

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