期刊
FUEL CELLS
卷 8, 期 2, 页码 120-128出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/fuce.200700060
关键词
bipolar plates; conductivity; extrusion; PEMFC; percolation
The main objective of this work was to develop films with controlled dimensions for proton exchange membrane fuel cell (PEMFC) bipolar plates (BPPs) using the twin-screw extrusion process. These films consisted of a low-viscosity polyethylene terephthalate (PET) in which a mixture of high specific surface area carbon black (CB) and synthetic flake graphite (GR) were dispersed. A third conductive additive, consisting of silvercoated glass particles (SCG) or multi-walled carbon nanotubes (NMCNT), was also added at a low concentration (5 wt.-%) in order to study its synergistic effect on the PET-based blend electrical conductivity. As the developed blends had to meet properties suitable for PEMFC bipolar plate applications, they were characterised for their electrical through-plane resistivity, mechanical properties and oxygen permeability. Through-plane electrical resistivity of about 0.3 Omega.cm and oxygen permeation rate of 3.5 x 10(-8) cc cm(-2) s(-1) were obtained for only 30 wt.-% of a 60:40 mixture of CB/GR conductive additives. Although the substitution of 5 wt.-% of CB/GR by the same amount of MWCNT had no significant effect on BPPs' electrical resistivity, it helped to improve their mechanical properties and especially their oxygen permeation, which was decreased from 3.5 x 10(-8) cc cm(-2) s(-1) to around 0.6 x 10(-8) cc cm(-2) s(-1).
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