Abstract In this study, we proposed an innovative and versatile method for preparation of highly stable and conductive supported ionic liquid (IL) membranes for proton exchange fuel cell applications. Novel covalently supported dual acidic IL membranes were prepared by radiation induced grafting of 4-vinyl pyridine (4-VP) onto poly(ethylene-co-tetrafluoroethylene) (ETFE) film followed by post-functionalization via sequential treatments with 1,4-butane sultone and sulfuric acid to introduce pyridinium alkyl sulfonate/hydrogen sulfate moieties. The advantage of our approach lies in grafting polymers with highly reactive functional groups suitable for efficient post-sulfonation. The membranes displayed better swelling and mechanical properties compared to Nafion 112 despite having more than 3 times higher ion exchange capacity (IEC). The proton conductivity reached superior values to Nafion above 80 °C. Particularly, the membrane with ion exchange capacity of 3.41 displayed a proton conductivity of 259 mScm−1 at 95 °C. This desired conductivity value is attributed to the high IEC of the membranes as well as dissociation of the hydrophobic ETFE polymer and hydrophilic pyridinium alkyl sulfonate groups. Such appealing properties make the supported IL membranes promising for proton exchange membrane fuel cells (PEMFC).

中文翻译：

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用于聚合物电解质膜燃料电池应用的负载型双酸性离子液体的制备和表征

摘要 在这项研究中，我们提出了一种创新且通用的方法来制备用于质子交换燃料电池应用的高度稳定和导电的负载型离子液体 (IL) 膜。通过将 4-乙烯基吡啶（4-VP）辐射诱导接枝到聚（乙烯-共-四氟乙烯）（ETFE）膜上，然后通过 1,4-丁烷顺序处理进行后功能化，制备了新型共价支持的双酸性 IL 膜磺内酯和硫酸引入吡啶鎓烷基磺酸盐/硫酸氢部分。我们方法的优势在于接枝聚合物具有适合高效后磺化的高反应性官能团。尽管离子交换容量 (IEC) 高出 3 倍以上，但与 Nafion 112 相比，该膜显示出更好的溶胀性和机械性能。质子电导率在 80°C 以上达到优于 Nafion 的值。特别是，离子交换容量为 3.41 的膜在 95°C 下显示出 259 mScm-1 的质子电导率。这种所需的电导率值归因于膜的高 IEC 以及疏水性 ETFE 聚合物和亲水性吡啶鎓烷基磺酸盐基团的解离。这种吸引人的特性使支持的 IL 膜有望用于质子交换膜燃料电池 (PEMFC)。