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Measurement of effective bulk and contact resistance of gas diffusion layer under inhomogeneous compression – Part I Electrical conductivity.pdf
Journal of Power Sources 320 (2016) 274e285
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 I: Electrical conductivity
Ajit Vikram 1, Prabudhya Roy Chowdhury 2, Ryan K. Phillips, Mina Hoorfar*
University of British Columbia, School of Engineering, Kelowna, BC, Canada
highlights
Electrical bulk resistance of inhomogeneously compressed GDL is measured.
Contact resistance distribution is obtained for inhomogeneous compression of GDL.
Contact resistance has the major contribution in the overall electrical resistance.
Effective bulk resistance is lower for inhomogeneous than homogenous compression.
article info
Article history: Received 22 February 2016 Received in revised form 18 April 2016 Accepted 22 April 2016 Available online 29 April 2016
Keywords: Fuel cell Gas diffusion layer Inhomogeneous compression Electrical contact resistance Bulk resistance
graphical abstract
abstract
This paper describes a measurement technique developed for the determination of the effective electrical bulk resistance of the gas diffusion layer (GDL) and the contact resistance distribution at the interface of the GDL and the bipolar plate (BPP). The novelty of this study is the measurement and separation of the bulk and contact resistance under inhomogeneous compression, occurring in an actual fuel cell assembly due to the presence of the channels and ribs on the bipolar plates. The measurement of the electrical contact resistance, contributing to nearly two-third of the ohmic losses in the fuel cell assembly, shows a non-linear distribution along the GDL/BPP interface. The effective bulk resistance of the GDL under inhomogeneous compression showed a decrease of nearly 40% compared to that estimated for homogeneous compression at different compression pressures. Such a decrease in the effective bulk resistance unde
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