Thermal conductivity and contact resistance of compressed gas diffusion layer of PEM fuel cell

Iwao Nitta, Olli Himanen, Mikko Mikkola

Research output: Contribution to journalArticleScientificpeer-review

86 Citations (Scopus)

Abstract

This paper discusses the effect of compression pressure on the mechanical and thermal properties of gas diffusion layers (GDL). The stress-strain curve of the GDL revealed one nonlinear and two piecewise linear regions within the compression pressure range of 0-5.5 MPa. The thermal conductivity of the compressed GDL seems to be independent of the compression pressure and was determined to be 1.18 +/- 0.11 W m(-1) K-1 at room temperature. The thermal contact resistance between the GDL and graphite was evaluated by augmenting experiments with computer modelling. The thermal contact resistance decreased nonlinearly with increasing compression pressure. According to the results here, the thermal bulk resistance of the GDL is comparable to the thermal contact resistance between the GDL and graphite. A simple one-dimensional model predicted a temperature drop of 1.7-4.4 degrees C across the GDL and catalyst layer depending on compression pressures.

Original languageEnglish
Pages (from-to)111-119
Number of pages9
JournalFuel Cells
Volume8
Issue number2
DOIs
Publication statusPublished - Apr 2008
MoE publication typeA1 Journal article-refereed

Keywords

  • gas diffusion layer
  • inhomogeneous compression
  • PEM fuel cells
  • stress-strain curve
  • thermal conductivity
  • thermal contact resistance
  • LIQUID WATER TRANSPORT
  • PARAMETER SENSITIVITY EXAMINATION
  • BIPOLAR PLATE
  • INHOMOGENEOUS COMPRESSION
  • ELECTRICAL-CONDUCTIVITY
  • EXPERIMENTAL VALIDATION
  • CATALYST LAYER
  • STEADY-STATE
  • FLOW-FIELD
  • PART II

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