DMFC用质子型离子液体复合隔膜的制备及性能表征

Preparation of the Protic Ionic Liquid/PVDF-HFP Composite Membranes and its Performance for DMFC

由酸碱中和法制得质子型离子液体α-甲基吡啶三氟乙酸盐,再经相转化将质子型离子液体与PVDF-HFP复合成(PIL)/PVDF-HFP膜.交流阻抗测试表明,复合膜电导率随温度增加而递增,室温电导率:8×10-3S/cm,30℃电导率:1×10-2S/cm,80℃电导率:3×10-2S/cm.用计时电流法研究复合前后膜的甲醇渗透性能,结果显示,该离子液体复合前、后膜的阻醇性能无明显变化,但复合膜阻醇性能略优.

The protic ionic liquid （PIL） a-methyl pyridinium trifluoroacetate （ [ α-MPyH] Tfa） was synthesized by acid ＆ alkali neutralization. Then PIL/PVDF-HFP composite membranes were prepared by means of phase inversion method using acetone as solvent. The conductivities of the composite membrane increased with the temperature and reached 8 ×10^-3 S/cm, 1 × 10^-2 S/cm and 3 × 10^-2 S/cm at room-temperature, 30 ℃ and 80℃, respectively, by electrochemical impedance method. The properties of the methanol-rejecting of the membranes were measured by chronoamperometry as well. The results indicate that the properties of methanol-resistance of the membranes before and after IL combination were equivalent approximately.