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基于咪唑类离子液体含氟阴离子的调控制备高质子传导率的OPBI共混膜

作者：孙冉鑫，肖意明，沈晓宇，尹振，王松博，张蕾，唐娜

单位：天津科技大学化工与材料学院，天津 300457

关键词：离子液体；聚苯并咪唑；质子交换膜；质子传导率

DOI号：

分类号： TM911.47

出版年,卷(期):页码： 2022,42(5):8-16

摘要：

磷酸掺杂聚苯并咪唑（PA-PBI）膜被认为是最具发展潜力的高温质子交换膜材料之一，但如何制备出高质子传导率的膜材料，仍是PA-PBI高温质子交换膜所面临的挑战性难题。为此，本文通过烷基化反应、离子交换反应，合成了阴离子为PF6-和BF4-的两种咪唑类离子液体（[ViEtIm]PF6、[ViEtIm]BF4），通过与芳醚型聚苯并咪唑（OPBI）共混并采用流延法制备了[ViEtIm]PF6/OPBI和[ViEtIm]BF4/OPBI膜，进一步通过红外光谱、热重分析和SEM表征验证了离子液体与OPBI共混膜结构。对共混膜进行高温质子交换膜性能研究，结果表明：[ViEtIm]PF6/OPBI膜综合性能优于[ViEtIm]BF4/OPBI膜及原OPBI膜，特别是在质子传导率方面，[ViEtIm]PF6/OPBI膜的质子传导率高达37.6 mS/cm，分别是[ViEtIm]BF4/OPBI膜和原OPBI膜的1.5倍和4.3倍。

Phosphoric acid doped polybenzimidazole (PA-PBI) membrane is one of the most promising high-temperature proton exchange membrane materials. The preparation of membrane materials with high proton conductivity is a challenging problem of phosphoric acid doped polybenzimidazole high-temperature proton exchange membrane. In this work, we synthesized two kinds of imidazole ionic liquids ([ViEtIm]PF6 and [ViEtIm]BF4) with anions of PF6- and BF4- through alkylation reaction and ion exchange reaction. The blend membrane were prepared by casting method via co-blending ionic liquids and poly(aryl ether benzimidazole) (OPBI). The structure of the blend membrane was characterized by infrared spectroscopy, thermogravimetric analysis and SEM. The proton conductivity of [ViEtIm]PF6/OPBI membrane is as high as 37.6 mS/cm, which is 1.5 times and 4.3 times that of [ViEtIm]BF4/OPBI membrane and original OPBI membrane. In conclusion, the comprehensive performance of [ViEtIm]PF6/OPBI membrane containing more fluorine structure is better than [ViEtIm]BF4/OPBI membrane and original OPBI membrane, especially in proton conductivity.

基金项目：

天津市高等学校创新团队培养计划(TD13-5008)；教育部科研创新团队培育计划(IRT-17R81)

作者简介：

孙冉鑫（1996-），女，汉族，辽宁大连人，研究生，研究方向为燃料电池关键材料，E-mail：2071308701@qq.com

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