A study of a composite bipolar plate for PEMFC

The influences of the different conductive fillers (graphite), resins, pressures and temperature on the properties of resin/graphite composite PEMFC bipolar plates were investigated. Results show that the components of conductive filler, and the sort and content of resin have a larger effect on the composite properties than do the pressure and temperature. Bipolar plates using a mixture of natural graphite and electrographite as conductive filler are better than that using a single component. The resin content, molding pressures and temperature should be 16-18w/%, 10-20MPa and 150-200℃, respectively. The composite bipolar plates obtained have a conductivity over 300S/cm, a flexural strength over 30MPa and a permeability of 10~~-7)cm~2/s.