Inhomogeneous compression of PEMFC gas diffusion layer Part I. Experimental

Iwao Nitta*, Tero Hottinen, Olli Himanen, Mikko Mikkola

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

173 Citations (Scopus)

Abstract

This paper presents a study on the effect of inhomogeneous compression of gas diffusion layer (GDL) caused by the channel/rib structure of flow-field plate. The experimentally evaluated properties are GDL intrusion into the channel, gas permeability, in-plane and through-plane bulk electric conductivities, and contact resistances at interfaces as a function of compressed thickness of GDL. It was found that the GDL is compressed very little under the channel whereas GDL under the rib is compressed to gasket thickness. The compression of GDL reduces gas permeability and contact resistance, and improves bulk conductivity. Hence, the inhomogeneous compression of GDL may lead into significant local variation of mass and charge transport properties in the GDL. These effects have been ignored in most of the published modeling studies. This contribution, part I, covers the experimental setup and measurement results, and a model which takes the inhomogeneous compression of GDL into account is presented in part II. (C) 2006 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)26-36
Number of pages11
JournalJournal of Power Sources
Volume171
Issue number1
DOIs
Publication statusPublished - 19 Sep 2007
MoE publication typeA1 Journal article-refereed

Keywords

  • PEMFC
  • gas diffusion layer
  • inhomogeneous compression
  • contact resistance
  • gas permeability
  • electrical conductivity
  • ELECTROLYTE FUEL-CELL
  • BIPOLAR PLATE MATERIAL
  • CONTACT RESISTANCE
  • TRANSPORT PHENOMENA
  • FLOW-FIELD
  • MEMBRANE
  • PERFORMANCE
  • THICKNESS
  • CATHODE
  • CONDUCTIVITY

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