Electrical properties of bipolar plate and gas diffusion layer in PEFC

▸ No noticeable increase in contact area with increasing compression pressure above a level of 0.8 MPa. ▸ At a compression pressure of 2.0 MPa, contact area ratio of 38% was obtained. ▸ The decrease in contact resistance relative to Au coverage was less than 1 mΩ cm2 over coverage of 0.6. ▸ Contact resistance depends not only on the coating coverage but on in-plane resistance of the GDL.