Water, proton, and oxygen transport in high IEC, short side chain PFSA ionomer membranes: consequences of a frustrated network

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DOIResolve DOI: http://doi.org/10.1039/c1cp22559f
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TypeArticle
Journal titlePhysical Chemistry Chemical Physics
Volume13
Issue40
Pages1805518062; # of pages: 8
Subjection exchange capacity (IEC); PFSA; ionomer membranes
AbstractThe effect of ion exchange capacity (IEC) on the water sorption properties of high IEC, short side chain (SSC) PFSA ionomer membranes, and the relationships between water content, proton conductivity, proton mobility, water permeation, oxygen diffusion, and oxygen permeation are investigated. SSC PFSA ionomer membranes possessing 1.3, 1.4, and 1.5 mmol g-1 IEC are compared to a series of long side chain (LSC) PFSA ionomer membranes ranging in IEC from 0.9 to 1.13 mmol g-1. At 25 C, fully-hydrated SSC ionomer membranes are characterized as possessing higher water contents (56–75 vol percent), moderate values (15–18), high analytical acid concentrations (2–2.8 M), and moderate conductivity (88–115 mS/cm); but lower than anticipated effective proton mobility. Complementary measurements of water permeability, oxygen diffusion, and oxygen permeability also yield lower than expected values given their much higher water contents. Potential benefits afforded by reducing the side chain length of PFSA ionomer membranes, such as increased crystallinity, higher IEC, and high hydrated acid concentration are offset by a less-developed, frustrated hydrophilic percolation network, which provides a motivation for future improvements of transport properties for this class of material.
Publication date
LanguageEnglish
AffiliationNRC Institute for Fuel Cell Innovation; National Research Council Canada
Peer reviewedYes
NPARC number19542553
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Record identifier28d50553-df10-4779-85f9-735df1d94891
Record created2012-02-23
Record modified2016-05-09
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