Research on the Efficient Forming and Performance Optimization of Epoxy Resin/Graphite Composites Catalyzed by 2-Methylimidazole

Abstract

Composite bipolar plates (CBPs) composed of resin and conductive fillers have the potential to combine excellent conductivity with superior mechanical properties, as key components in proton exchange membrane fuel cells (PEMFCs). However, the slow curing time limits the molding efficiency of CBPs. In this work, we propose a facile method for the efficient compression molding of epoxy resin/graphite composites catalyzed by 2-methylimidazole. By utilizing the catalytic effect of tertiary amine, the nucleophilic reactivity of the curing agent is enhanced, and the energy barrier for the ring opening of epoxy groups is reduced, thus enabling the efficient formation of CBPs within 5 minutes. Additionally, by adjusting the molding temperature and pressure, a synergistic improvement in conductivity, mechanical properties and gas impermeability is achieved. This work provides a theoretical basis for the efficient molding and performance optimization of CBPs through resin modification and process optimization.

Keywords: Proton exchange membrane fuel cells, Composite bipolar plates, Compression molding, Electrical conductivity, Mechanical strength