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Water vapor sorption thermodynamics of the Nafion ionomer membrane

Wadsö, Lars LU and Jannasch, Patric LU (2013) In The Journal of Physical Chemistry Part B 117(28). p.8561-8570
Abstract
The water interactions of polymer electrolyte membranes are of significant interest when these materials are used in for example fuel cells. We have therefore studied the sorption thermodynamics of Nafion 117 with a sorption calorimeter that simultaneously measures the sorption isotherm and the mixing (sorption) enthalpy. This unique method is suitable for investigating the sorption thermodynamics of ionic polymers. The measurements were made at 25 °C on a series of samples dried at different temperatures from 25 to 120 °C. The sorption isotherms indicate that the samples dried at 120 °C lost about 0.8 more water molecules per sulfonic group during the drying than did the samples dried at 25 °C, and this result was verified... (More)
The water interactions of polymer electrolyte membranes are of significant interest when these materials are used in for example fuel cells. We have therefore studied the sorption thermodynamics of Nafion 117 with a sorption calorimeter that simultaneously measures the sorption isotherm and the mixing (sorption) enthalpy. This unique method is suitable for investigating the sorption thermodynamics of ionic polymers. The measurements were made at 25 °C on a series of samples dried at different temperatures from 25 to 120 °C. The sorption isotherms indicate that the samples dried at 120 °C lost about 0.8 more water molecules per sulfonic group during the drying than did the samples dried at 25 °C, and this result was verified gravimetrically. The mixing enthalpies showed several peaks or plateaus for the samples dried at 60-120 °C. This behavior was seen up to about 2 water molecules per sulfonic group. As these peaks were not directly related to any feature in the sorption isotherm they probably have their origin in a secondary process, such as a reorganization of the polymer. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Ionomer, Nafion, water vapor, sorption, sorption isotherm, sorption enthalpy
in
The Journal of Physical Chemistry Part B
volume
117
issue
28
pages
8561 - 8570
publisher
The American Chemical Society (ACS)
external identifiers
  • wos:000322149900028
  • scopus:84880560352
ISSN
1520-5207
DOI
10.1021/jp3089319
language
English
LU publication?
yes
id
db989114-d217-4dec-a114-41505471bf1f (old id 3363516)
alternative location
http://pubs.acs.org/doi/abs/10.1021/jp3089319
date added to LUP
2013-06-24 16:00:25
date last changed
2019-10-20 03:02:43
@article{db989114-d217-4dec-a114-41505471bf1f,
  abstract     = {The water interactions of polymer electrolyte membranes are of significant interest when these materials are used in for example fuel cells. We have therefore studied the sorption thermodynamics of Nafion 117 with a sorption calorimeter that simultaneously measures the sorption isotherm and the mixing (sorption) enthalpy. This unique method is suitable for investigating the sorption thermodynamics of ionic polymers. The measurements were made at 25 °C on a series of samples dried at different temperatures from 25 to 120 °C. The sorption isotherms indicate that the samples dried at 120 °C lost about 0.8 more water molecules per sulfonic group during the drying than did the samples dried at 25 °C, and this result was verified gravimetrically. The mixing enthalpies showed several peaks or plateaus for the samples dried at 60-120 °C. This behavior was seen up to about 2 water molecules per sulfonic group. As these peaks were not directly related to any feature in the sorption isotherm they probably have their origin in a secondary process, such as a reorganization of the polymer.},
  author       = {Wadsö, Lars and Jannasch, Patric},
  issn         = {1520-5207},
  keyword      = {Ionomer,Nafion,water vapor,sorption,sorption isotherm,sorption enthalpy},
  language     = {eng},
  number       = {28},
  pages        = {8561--8570},
  publisher    = {The American Chemical Society (ACS)},
  series       = {The Journal of Physical Chemistry Part B},
  title        = {Water vapor sorption thermodynamics of the Nafion ionomer membrane},
  url          = {http://dx.doi.org/10.1021/jp3089319},
  volume       = {117},
  year         = {2013},
}