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

Iwao Nitta (Corresponding Author), Olli Himanen, Mikko Mikkola

    Research output: Contribution to journalArticleScientificpeer-review

    75 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 °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 - 2008
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Gas diffusion layer
    • Inhomogeneous compression
    • PEM Fuel cells
    • fuel cells
    • Stress-strain curve
    • Thermal conductivity
    • Thermal contact resistance

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