Synthesized Geminal-imidazolium-type ionic liquids applying for PVA-FP/[DimL] [OH] anion exchange membranes for fuel cells

摘要

Geminal-imidazolium-type ionic liquid ([DimL] [OH] ILs) was synthesized. Then, a series of membranes (PVAFP/[DimL] [OH]) was prepared with pyridine functionalized poly(vinyl alcohol) (PVA-FP) as the polymer matrix. Characteristic results reveal that crystallinity of the aforementioned membrane was effectively reduced, the initial thermal degradation temperature was elevated 87 degrees C than that of unmodified PVA-GA membrane. And the maximum OH- conductivity is 5.8 x 10(-2)S. cm(-1) at 70 degrees C, only 4.6% decline of OH- conductivity can be observed after immersing it in 1 M KOH solution for 240 h, and only 13.1% decline under 6 M KOH solution was used. Besides, methanol permeability (1.1-5.1) x 10(-6 )cm(2).s(-1) was lower than that of Nafion (R) 117 (4.5-9.2) x 10(-6) cm(2).s(-1) at 30 degrees C. Finally, a peak power density of 48 mW cm(-2) at 70 degrees C can be obtained under a single cell test.