Mechanical properties of Nafion and titania/Nafion composite membranes for polymer electrolyte membrane fuel cells

M. Barclay Satterfield, Paul W. Majsztrik, Hitoshi Ota, Jay Burton Benziger, Andrew Bruce Bocarsly

Research output: Contribution to journalArticle

185 Scopus citations

Abstract

Measurements of the mechanical and electrical properties of Nafion and Nafion/titania composite membranes in constrained environments are reported. The elastic and plastic deformation of Nafion-based materials decreases with both the temperature and water content. Nafion/titania composites have slightly higher elastic moduli. The composite membranes exhibit less strain hardening than Nafion. Composite membranes also show a reduction in the long-time creep of ∼40% in comparison with Nafion. Water uptake is faster in Nafion membranes recast from solution in comparison with extruded Nafion. The addition of 3-20 wt % titania particles has minimal effect on the rate of water uptake. Water sorption by Nafion membranes generates a swelling pressure of ∑0.55 MPa in 125-μm membranes. The resistivity of Nafion increases when the membrane is placed under a load. At 23°C and 100% relative humidity, the resistivity of Nafion increases by ∼15% under an applied stress of 7.5 MPa. There is a substantial hysteresis in the membrane resistivity as a function of the applied stress depending on whether the pressure is increasing or decreasing. The results demonstrate how the dynamics of water uptake and loss from membranes are dependent on physical constraints, and these constraints can impact fuel cell performance.

Original languageEnglish (US)
Pages (from-to)2327-2345
Number of pages19
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume44
Issue number16
DOIs
StatePublished - Aug 15 2006

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry

Keywords

  • Ionomer
  • Mechanical properties
  • Nafion
  • PEM fuel cells
  • Polymer composites
  • Structure-property relations
  • Water sorption

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