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Pore size distribution and water uptake in hydrocarbon and perfluorinated proton-exchange membranes as studied by NMR cryoporometry

von Kraemer, S.; Sagidullin, A.I.; Lindbergh, G.; Furo, I.; Persson Jutemar, Elin LU and Jannasch, Patric LU (2008) In Fuel Cells 8(3-4). p.262-269
Abstract
Sulfonated polysulfone (sPSU) membranes were analysed by nuclear magnetic resonance (NMR) cryoporometry, conventional gravimetric water uptake measurements as well as by differential scanning calorimetry (DSC). NMR cryoporometry is based on the relation between the pore size and the melting point depression of the pore-filling liquid, i.e. water in fuel cell membranes; thus providing a relation between the amount of molten water and the temperature shift, i.e. the pore size, in hydrated membranes. An sPSU membrane with high ion-exchange capacity (IEC 1.45 mequiv. g-1) possessed a significant amount of large pores after hydrothermal pre-treatment at 80 °C, which was related to its high hydrophilicity and low resistance towards swelling. An... (More)
Sulfonated polysulfone (sPSU) membranes were analysed by nuclear magnetic resonance (NMR) cryoporometry, conventional gravimetric water uptake measurements as well as by differential scanning calorimetry (DSC). NMR cryoporometry is based on the relation between the pore size and the melting point depression of the pore-filling liquid, i.e. water in fuel cell membranes; thus providing a relation between the amount of molten water and the temperature shift, i.e. the pore size, in hydrated membranes. An sPSU membrane with high ion-exchange capacity (IEC 1.45 mequiv. g-1) possessed a significant amount of large pores after hydrothermal pre-treatment at 80 °C, which was related to its high hydrophilicity and low resistance towards swelling. An sPSU membrane with low IEC (0.95 mequiv. g-1) showed a significant fraction of small pores (r ~ 1 nm) after hydrothermal pre-treatment at 80 °C, implying a controlled water uptake of the membrane. NMR cryoporometry was also carried out on Nafion membranes, the results were found to be in agreement with the water uptake measurements and revealed a pore size distribution peak at r ~ 1 nm. The NMR cryoporometry, gravimetric water uptake and DSC results are also discussed in terms of the state of the water and methodological differences. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Differential Scanning Calorimetry • Nafion • Nuclear Magnetic Resonance Cryoporometry • Proton-Exchange Membrane Fuel Cell • PEMFC • Sulfonated Polysulfone • Water Domain Size • Water Uptake
in
Fuel Cells
volume
8
issue
3-4
pages
262 - 269
publisher
John Wiley & Sons
external identifiers
  • wos:000258086400013
  • scopus:55349126100
ISSN
1615-6854
DOI
10.1002/fuce.200800010
language
English
LU publication?
yes
id
c171ffd4-5552-447d-b380-c2e31faee716 (old id 1150226)
alternative location
http://www3.interscience.wiley.com/journal/119816844/abstract?CRETRY=1&SRETRY=0
date added to LUP
2008-08-11 10:28:25
date last changed
2017-08-06 03:41:22
@article{c171ffd4-5552-447d-b380-c2e31faee716,
  abstract     = {Sulfonated polysulfone (sPSU) membranes were analysed by nuclear magnetic resonance (NMR) cryoporometry, conventional gravimetric water uptake measurements as well as by differential scanning calorimetry (DSC). NMR cryoporometry is based on the relation between the pore size and the melting point depression of the pore-filling liquid, i.e. water in fuel cell membranes; thus providing a relation between the amount of molten water and the temperature shift, i.e. the pore size, in hydrated membranes. An sPSU membrane with high ion-exchange capacity (IEC 1.45 mequiv. g-1) possessed a significant amount of large pores after hydrothermal pre-treatment at 80 °C, which was related to its high hydrophilicity and low resistance towards swelling. An sPSU membrane with low IEC (0.95 mequiv. g-1) showed a significant fraction of small pores (r ~ 1 nm) after hydrothermal pre-treatment at 80 °C, implying a controlled water uptake of the membrane. NMR cryoporometry was also carried out on Nafion membranes, the results were found to be in agreement with the water uptake measurements and revealed a pore size distribution peak at r ~ 1 nm. The NMR cryoporometry, gravimetric water uptake and DSC results are also discussed in terms of the state of the water and methodological differences.},
  author       = {von Kraemer, S. and Sagidullin, A.I. and Lindbergh, G. and Furo, I. and Persson Jutemar, Elin and Jannasch, Patric},
  issn         = {1615-6854},
  keyword      = {Differential Scanning Calorimetry • Nafion • Nuclear Magnetic Resonance Cryoporometry • Proton-Exchange Membrane Fuel Cell • PEMFC • Sulfonated Polysulfone • Water Domain Size • Water Uptake},
  language     = {eng},
  number       = {3-4},
  pages        = {262--269},
  publisher    = {John Wiley & Sons},
  series       = {Fuel Cells},
  title        = {Pore size distribution and water uptake in hydrocarbon and perfluorinated proton-exchange membranes as studied by NMR cryoporometry},
  url          = {http://dx.doi.org/10.1002/fuce.200800010},
  volume       = {8},
  year         = {2008},
}