Expanded Graphite Epoxy Composites Bipolar Plates for PEM Fuel Cells


YAZICI M. S.

ECS TRANSACTIONS, vol.41, no.1, pp.1869-1877, 2011 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 41 Issue: 1
  • Publication Date: 2011
  • Doi Number: 10.1149/1.3635717
  • Title of Journal : ECS TRANSACTIONS
  • Page Numbers: pp.1869-1877

Abstract

Light weight, flexible and thin single layer epoxy impregnated expanded graphite bipolar plates were manufactured and evaluated as a PEM fuel cell bipolar plate material. Mechanical strength values up to 17.41 MPa, in-plane electrical conductivity values up to 136.6 S/cm, through-plane electrical resistance of 0.027 Ohm-cm and flexibility (deflection at mid-span) values up to % 4.38 were obtained with epoxy impregnation in expanded graphite foams. The low thickness (similar to 0.5 mm) and density (similar to 1.2 g/cm(3)) values of the prepared composite plates put them one step ahead for mobile applications which require high mass and volumetric power density (W/kg, W/L). On the other hand, corrosion current and contact angle values of these composite plates couldn't achieve desired values.