Fuel cell: Synthesis and properties of polyimide for PEMFC at high temperature

Polyimides (PIs) with pendant benzimidazole groups have been synthesized via different ratio of 5-(1H-benzoimidazol-2-yl)-benzene-1-3-diamine (DABI) and dianhydride monomers(6FDA) and utilized as efficient proton conducting membranes for fuel cell applications. The synthesized polyimides showed an excellent performance in terms of proton conductivity, studied by impedance analyzer and polyimide with high DABI content exhibit highest conductivity (0.097 S/cm) at high temperature (150 °C). Additionally, synthesized polyimidesare thermally stable and exhibit high dielectric constants which were investigated by thermal gravimetric analysis (TGA), differential scanning calorimetry (DSC) and capacitance method, respectively. Thus the synthesized polyimides open a new gate way to utilize themas an efficient proton conductor to fabricate proficient fuel cell.