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Preparation of poly(aryl ether benzimidazole) blend membranes with high proton conductivity based on the regulation of fluorine-containing anions in imidazole ionic liquids

Authors： SUN Ranxin, XIAO Yiming, SHEN Xiaoyu, YIN Zhen, WANG Songbo, ZHANG Lei,.TANG Na

Units： College of Chemical Engineering and Materials，Tianjin University of Science & Technology Tianjin 300457 China

KeyWords： Polybenzimidazole; Ionic liquid; Proton exchange membrane; Proton conductivity

ClassificationCode：TM911.47

year,volume(issue):pagination： 2022,42(5):8-16

Abstract：

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.

Funds：

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)

AuthorIntro：

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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