LAUSR

Abstract Geminal-imidazolium-type ionic liquid ([DimL][OH] ILs) was synthesized. Then, a series of membranes (PVA-FP/[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 °C than that of unmodified PVA-GA membrane. And the maximum OH− conductivity is 5.8 × 10−2 S·cm−1 at 70 °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) × 10−6 cm2·s−1 was lower than that of Nafion®117 (4.5–9.2) × 10−6 cm2·s−1 at 30 °C. Finally, a peak power density of 48 mW cm−2 at 70 °C can be obtained under a single cell test.