Water permeation analysis on gas diffusion layers of proton exchange membrane fuel cells for Teflon-coating annotation

Yen I. Chou*, Zih Yuan Siao, Yu Feng Chen, Lung Yu Sung, Wen Mei Yang, Chi-Chuan Wang

*Corresponding author for this work

Research output: Contribution to journalArticle

29 Scopus citations

Abstract

This study presents an analysis of water permeation of a polytetrafluoroethylene (PTFE)-coated gas diffusion layer (GDL) to determine the influence of hydrophobic treatment on the GDL for diagnosis of water flooding. It is found that the behaviour of water drainage is controlled by the pore configuration instead of the hydrophobicity in GDL. Better water drainage is achieved by the action of the Teflon coating in modulating the GDL pore configuration to give both a larger average pore size and a wider distribution of pore size. The results show that water penetration through the GDL must overcome a threshold surface tension defined by the largest pore range. A 30 wt.% PTFE coating of a GDL is shown to generate a satisfactory pore configuration, explaining the improved cell polarization performance with a lower driven pressure (∼1.91 kPa) and a higher rate of water drainage.

Original languageEnglish
Pages (from-to)536-540
Number of pages5
JournalJournal of Power Sources
Volume195
Issue number2
DOIs
StatePublished - 15 Jan 2010

Keywords

  • Gas diffusion layer
  • Hydrophobic
  • Polytetrafluoroethylene
  • Proton exchange membrane fuel cells
  • Water flooding
  • Water permeation

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