Elevating the operating temperature of polymer electrolyte fuel cells (PEFCs) can facilitate the reaction kinetics and improve the CO tolerance of catalysts, and simplify the complex water-heat management system of fuel cells. In this study, we fabricated the ionic liquid-based polymer electrolyte that can operate up to 250 °C without external humidification. The membrane utilized polybenzimidazole (PBI) as the polymer matrix, and ionic liquids as the proton conductive fillers. Among all the investigated ionic liquids, diethylmethylammonium trifluoromethanesulfonate ([dema][TfO]) shows favorable performance and stability. The PBI-[dema][TfO] composite membrane exhibits high proton conductivity of 108.9 mS cm⁻¹ at 250 °C. The single cell with PBI-[dema][TfO] composite membrane and Pt/C as the electrode shows output performance of 144 and 62 mW/cm² at 125 °C and 250 °C, respectively. This work demonstrates that it is very promising to fabricate high temperature PEFCs using the ionic liquid-based polymer electrolyte.

升高聚合物电解质燃料电池（PEFC）的工作温度可以促进反应动力学并提高催化剂的CO耐受性，并简化燃料电池复杂的水热管理系统。在这项研究中，我们制造了离子液体基聚合物电解质，该电解质可在高达250°C的温度下运行而无需外部加湿。该膜使用聚苯并咪唑（PBI）作为聚合物基质，并使用离子液体作为质子传导性填料。在所有研究的离子液体中，三氟甲磺酸二乙基甲基铵（[dema] [TfO]）显示出良好的性能和稳定性。PBI- [dema] [TfO]复合膜的质子传导率高达108.9 mS cm ^-1在250°C下。以PBI- [dema] [TfO]复合膜和Pt / C作为电极的单电池在125°C和250°C下的输出性能分别为144和62 mW / cm ²。这项工作表明，使用离子液体基聚合物电解质制造高温PEFC非常有前途。