期刊
JOURNAL OF POWER SOURCES
卷 195, 期 2, 页码 536-540出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2009.07.049
关键词
Proton exchange membrane fuel cells; Gas diffusion layer; Hydrophobic; Water permeation; Water flooding; Polytetrafluoroethylene
资金
- Department of Industrial Technology, Ministry of Economic Affairs, Taiwan
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 (similar to 1.91 kPa) and a higher rate of water drainage. (C) 2009 Elsevier B. V. All rights reserved.
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