| 초록 |
Sulfonated poly(ether ether ketone) (sPEEK)/mesoporous benzene-silica electrolyte composite membranes were prepared by a solvent casting method. Two components were mixed thoroughly in N,Ndimethyl acetamide, up to 20 wt% of the mesoporous benzene-silica powder. The sulfonation degree of sPEEK polymer used was 65% and the ion exchange capacity of the mesoporous benzene-silica was 0.60 meq/g. Mesoporous benzene-silica material used bore a 2D hexagonal (p6mm) mesostructure and pore diameter of 2.7 nm. The composite membranes showed proton conductivities higher than pristine sPEEK membrane that increased with temperature. However, the sPEEK-based composite membranes showed very low methanol crossover below 5 × 10-7 cm2/s, still in the same range as the pristine sPEEK membrane. Regarding the sPEEK-OMB15 membrane, a maximum proton conductivity of 0.079 S/cm was obtained at 80 °C, with the highest DMFC cell performance at 56 mW/cm2, |
