Proton conducting ionic liquids (PILs) are discussed as new electrolytes for the use as non‐aqueous electrolytes at operation temperatures above 100 °C. During fuel cell operation the presence of significant amounts of residual water is unavoidable. The highly Brønsted‐acidic PIL 2‐Sulfoethylmethylammonum triflate [2‐Sema][TfO] is able to perform fast proton exchange processes with H₂O, resulting from ¹H‐NMR and pulsed field gradient (PFG)/diffusion ordered spectroscopy (DOSY) self‐diffusion measurements. Proton conduction takes place by a vehicle mechanism via PIL cations or H₃O⁺, but also by a cooperative mechanism involving both species. Thus, highly Brønsted‐acidic PILs are promising candidates for the use as non‐aqueous electrolytes. To use [2‐Sema][TfO] as electrolyte in a proton electrolyte fuel cell (PEFC) it has to be immobilized in a host polymer. There is a (slow) uptake of the PIL by polybenzimidazole (PBI) up to a weight increase of ∼130%, due to a swelling process. A protonation of the basic imidazole moieties takes place. NMR analysis was applied to elucidate the molecular interactions between PBI, PIL, and residual water. Proton exchange, respectively an interaction between the polar groups and water can be observed in spectra, indicating a network of H‐bonds in doped PBI. Therefore, highly acidic PILs are promising candidates for the use as non‐aqueous electrolytes.

中文翻译：

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PBI型聚合物和酸性质子传导离子液体–电导率和分子相互作用

质子传导离子液体（PIL）被讨论为在100°C以上的工作温度下用作非水电解质的新型电解质。在燃料电池运行期间，不可避免地存在大量残留水。高度布朗斯台德酸PIL 2-磺基乙基甲基三氟甲磺酸铵[2-Sema] [TfO]能够通过¹ H-NMR和脉冲场梯度（PFG）/扩散有序光谱法（DOSY）与H ₂ O进行快速质子交换过程）自扩散测量。质子传导通过车辆机制通过PIL阳离子或H ₃ O ^+发生，也可以通过涉及两种物种的合作机制来实现。因此，高度布朗斯台德酸性PILs有望用作非水电解质。要将[2-Sema] [TfO]用作质子电解质燃料电池（PEFC）中的电解质，必须将其固定在主体聚合物中。由于溶胀过程，聚苯并咪唑（PBI）对PIL的吸收（缓慢），直至重量增加约130％。发生碱性咪唑部分的质子化。应用NMR分析来阐明PBI，PIL和残留水之间的分子相互作用。可以在光谱中观察到质子交换，以及极性基团和水之间的相互作用，这表明掺杂的PBI中存在H键网络。因此，高酸性的PILs有望用作非水电解质。