In this work, we developed a family of proton-exchange membranes based on the composites of polymerized ionic liquids and protic ionic liquids using 1-methyl-imidazolium as the cation. The influence of anion groups on physical properties was investigated. Among three composites with bis(trifluoromethanesulfonyl)imide (TFSI), triflate (OTf), and H₂PO₄ anions, the composite with TFSI anion presents the best ion conductivity. A synergistic effect has been observed for the composite with both TFSI and OTf mixed anion, which showed significantly enhanced ionic conductivity compared to the composites with either anion alone, reaching 1.47 mS/cm at 120 °C. This work highlights the combination of TFSI and OTf anion as a facile and efficient strategy for improving ionic conductivity and shows a promising prospect of polyILs/protic ILs composites as proton-conducting membrane materials.

中文翻译：

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抗衡阴离子对聚合离子液体/离子液体质子交换膜性能的影响

在这项工作中，我们开发了一系列基于聚合离子液体和质子离子液体复合材料的质子交换膜，使用 1-甲基-咪唑鎓作为阳离子。研究了阴离子基团对物理性质的影响。在含有双（三氟甲磺酰基）酰亚胺 (TFSI)、三氟甲磺酸酯 (OTf) 和 H ₂ PO _{4 的}三种复合材料中阴离子时，TFSI 阴离子的复合物表现出最好的离子电导率。已经观察到具有 TFSI 和 OTf 混合阴离子的复合材料的协同效应，与单独使用任一阴离子的复合材料相比，其显示出显着增强的离子电导率，在 120°C 时达到 1.47 mS/cm。这项工作突出了 TFSI 和 OTf 阴离子的组合作为提高离子电导率的简便有效的策略，并显示了聚 ILs/质子 ILs 复合材料作为质子传导膜材料的广阔前景。