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http://dx.doi.org/10.3795/KSME-B.2013.37.8.767

Variation of Porosity and Gas Permeability of Gas Diffusion Layers Under Compression  

Lee, Yongtaek (Dept. of Mechanical Engineering, Hannam Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.37, no.8, 2013 , pp. 767-773 More about this Journal
Abstract
This study suggested the variations of porosity and gas permeability of gas diffusion layers (GDLs), which are easily deformed among the components of a highly compressed PEMFC stack. The volume change owing to compression was measured experimentally, and the variations in the porosity and gas permeability were estimated using correlations published in previous literature. The effect of polytetrafluoroethylene (PTFE) which is added to the GDLs to enhance water discharge was investigated on the variations of porosity and gas permeability. The gas permeability which strongly affects the mass transport through GDL, decreases sharply with increasing compression when the GDL has high PTFE loading. As a result, the mass transport through the pore network of GDL can be changed considerably according to the PTFE loading even with the same clamping force. The accuracy of modeling of transport phenomena through GDL can be improved due to the enhanced correlations developed based on the results of this study.
Keywords
Gas Diffusion Layer; Proton Exchange Membrane Fuel Cell(PEMFC); Compression; Porosity; Gas Permeability; Pore Network;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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