Effect of molding temperature on the properties of phenolic resin/carbon black/graphite composite bipolar plates

Bipolar plates are an important component of polymer electrolyte membrane fuel cell (PEMFC), and their production is crucial for the commercialization of PEMFCs. Therefore, phenolic resin/carbon black/graphite composite bipolar plates were prepared using different molding temperatures (150, 160, 170, 180 degrees C). The electrical conductivity, mechanical strength, corrosion resistance and mass loss of the composite bipolar plates were measured according to the applicable standards. Among the four composite plates, the composite bipolar plate prepared at 170 degrees C had a compressive strength of 68 MPa, a flexural strength of 45.3 MPa, an electrical conductivity of 331 S/cm, and the best properties. The electrical conductivity, flexural strength and mass loss of the composite plate prepared at 170 degrees C after being corroded in acid solution for 20 days are maintained in a relatively stable state.