Radiostation Grafted Ion-Conducting Membranes: The Influence of Variations in Base Film Nanostructure

Research output: Contribution to journalArticle

Abstract

The proton exchange membrane (PEM) is a key element of a polymer electrolyte fuel cell, and radiation-grafting is an attractive option for the synthesis of PEMs. Via a systematic investigation of a well-defined model material, sulfonated polystyrene grafted poly(ethylene-alt-tetrafluoroethylene), ETFE-g-PS(SA), we show that the performance and stability of radiation-grafted PEMs in fuel cells strongly depends on the microstructure of the underlying base polymer. The nanoscale structure of the base polymers, grafted films, and membranes is probed by small-angle scattering, and the nanoscale proton dynamics is probed by quasi-elastic neutron scattering. The results of these techniques correlated with fuel cell relevant properties—including proton conductivity and water uptake—and fuel cell performance clearly indicate that differences in the arrangement of the crystalline phase in the otherwise chemically identical semicrystalline base films can have considerable impact, representing an essential aspect to consider in the development of proton exchange membranes prepared via preirradiation grafting.

Details

Authors
  • Véronique Sproll
  • Gergely Nagy
  • Urs Gasser
  • Jan Peter Embs
  • Marc Obiols-Rabasa
  • Thomas J. Schmidt
  • Lorenz Gubler
  • Sandor Balog
Organisations
External organisations
  • Paul Scherrer Institute
  • ETH Zürich
  • University of Fribourg
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Physical Chemistry
Original languageEnglish
Pages (from-to)4253-4264
Number of pages12
JournalMacromolecules
Volume49
Issue number11
Publication statusPublished - 2016 May 17
Publication categoryResearch
Peer-reviewedYes