Abstract
The bipolar plate is an important component of the proton exchange membrane fuel cell (PEMFC) and composite graphite bipolar plates (CGBPs) have attracted interest due to competitive benefits. However, their mechanical and electrical qualities are insufficient to meet the PEMFC's standards. In this study, a structural design of CGBPs with different functional layers was proposed. The surface layer was molded graphite plate with resin infiltration treatment, and the middle layer was a carbon fiber fabric (CFF) as a reinforcing functional layer. The results showed that the surface layer prepared from flake graphite possessed denser structure, leading to higher airtightness and structural strength. The addition of carbon nanotube or graphene nanoplate could enhance the combination between CFF and resin observably, making CGBPs possessed an in-plane conductivity of 446 S/cm, an area specific resistance of 6.4 mΩ·cm2, a flexural strength of 72 MPa, and a Helium permeability of around 4.4×10-6 std cm3/cm2·s.
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