Measurement of effective bulk and contact resistance of gas diffusion layer under inhomogeneous compression – Part II Thermal conductivity.pdfVIP

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Measurement of effective bulk and contact resistance of gas diffusion layer under inhomogeneous compression – Part II Thermal conductivity.pdf

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Measurement of effective bulk and contact resistance of gas diffusion layer under inhomogeneous compression – Part II Thermal conductivity.pdf

Journal of Power Sources 320 (2016) 222e230 Contents lists available at ScienceDirect Journal of Power Sources journal homepage: /locate/jpowsour Measurement of effective bulk and contact resistance of gas diffusion layer under inhomogeneous compression e Part II: Thermal conductivity Prabudhya Roy Chowdhury 1, Ajit Vikram 2, Ryan K. Phillips, Mina Hoorfar* University of British Columbia, School of Engineering, Kelowna, BC, Canada highlights Thermal contact resistances at the GDL-Bipolar Plate (BPP) interface is measured. Bulk thermal conductivity of GDL is measured under inhomogeneous compression. Non-linear pressure distribution at the GDL-BPP interface is obtained numerically. Effective bulk thermal conductivity increases with increasing the pressure. Contact resistance has the major contribution in the overall thermal resistance. article info Article history: Received 21 February 2016 Received in revised form 19 April 2016 Accepted 22 April 2016 Available online 29 April 2016 Keywords: Fuel cell Gas diffusion layer Inhomogeneous compression Thermal contact resistance Bulk thermal conductivity graphical abstract abstract The gas diffusion layer (GDL) is a thin porous layer sandwiched between a bipolar plate (BPP) and a catalyst coated membrane in a fuel cell. Besides providing passage for water and gas transport from and to the catalyst layer, it is responsible for electron and heat transfer from and to the BPP. In this paper, a method has been developed to measure the GDL bulk thermal conductivity and the contact resistance at the GDL/BPP interface under inhomogeneous compression occurring in an actual fuel cell assembly. Toray carbon paper GDL TGP-H-060 was tested under a range of compression pressure of 0.34 to 1.71 MPa. The results showed that the thermal contact resistance decreases non-linearly (from 3.8 ? 10à4 to 1.17 ? 10à4 Km2 Wà1) with increasing pressure due to increase in microscopic contact area between the GDL and BPP; while the effective