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Asymmetric proton-conducting membrane made by photopolymerization

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2011
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Authors
Radovanović, Filip
Kellner, Michael
Matovic, Jovan
Liska, Robert
Conference object (Published version)
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Abstract
Proton-conducting membranes with interpenetrating polymer network morphology have been frequently considered in recent years for potential replacement of standard Nafion membranes in direct methanol fuel cells. Asymmetric membranes comprising protonconducting channels of cross-linked sulfonic acid functionalized ionomers embedded within a matrix of thermally-resistant, glassy polymer were prepared by photopolymerization starting from a polymer solution and evaluated in our laboratories. These membranes have an integral top skin layer with fine proton-conducting channels, which serves as a barrier against methanol crossover, on top of a coarser proton-conducting support. Conductivity of asymmetric membranes over a range of initial polymer concentrations and ion-exchange capacities (IEC) was just slightly lower than for the corresponding symmetric membranes. Methanol barrier properties of asymmetric proton-conducting membranes were better than that of the state-of-the art Nafion 115 mem...brane. The crosslinking agent functionality had a major effect on membrane conductivity. Use of trifunctional crosslinking agents resulted in significantly higher conductivities than those obtained with bifunctional agents, even surpassing the conductivity of Nafion membranes.

Keywords:
proton-conducting membranes / polymer networks / Nafion / fuel cells
Source:
RadTech Europe 2011 - Abstract Book, 2011, 129-129
Publisher:
  • Basel : RadTech Europe
Projects:
  • MULTIPLAT - Biomimetic Ultrathin Structures as a Multipurpose Platform for Nanotechnology-Based Products (EU-228943)
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URI
http://dais.sanu.ac.rs/123456789/790
Collections
  • Radovi istraživača pre dolaska u ITN SANU
Institution
Институт техничких наука САНУ / Institute of Technical Sciences SASA

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