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Properties of N-spirocyclic flexible side chain type PBI anion exchange membranes

Authors： Yang Zhaozhao, Wang Xiaozhou, Chen Wanting, Cui Fujun, He Gaohong, Wu Xuemei

Units： 1. State Key Laboratory of Fine Chemicals, Dalian University of Technology, Membrane Science and Technology Research and Development Center, Dalian 116024, China; 2. Panjin Institute of Industrial Technology, Dalian University of Technology, Panjin 124221，China

KeyWords： anion exchange membrane; N-spirocyclic; polybenzimidazole; alkali stability; fuel cell

ClassificationCode：TQ028；TM912.1

year,volume(issue):pagination： 2023,43(6):71-78

Abstract：

In this work, a N-spirocyclic flexible side chain type PBI anion exchange membrane is proposed, in which both main chain and side chain structures have strong alkali stability. The N-spirocyclic cationic group was prepared by 1,4-dibromobutane and 1,3-bis (4-piperidine) propane, and polybenzimidazole (PBI) was used as substrate to graft the flexible side chain of N-spirocyclic cationic groups. The flexible diether-oxygen spacer in side chain promotes the membrane-forming ability of the highly rigid N-spirocyclic group, as well as the good microphase separation morphology in the membrane. The ASD-PBI-90 membrane shows conductivity of about 83.2 mS/cm, as well as excellent alkaline stability with around 94.2% retention in conductivity after soaking in 1 mol/L KOH solution at 80℃ for 1080 h. H2/O2 fuel cell performance assembled with ASD-PBI-90 membrane exhibits a maximum peak power density of 367 mW/cm2 at 60℃. ASD-PBI membranes show excellent alkali stability, good conductivity and fuel cell performance, which is promising to H2/O2 fuel cell applications.

Funds：

国家自然科学基金创新研究群体项目(22021005)

AuthorIntro：

杨照照（1997-），女，山西运城人，硕士，从事阴离子交换膜研究，E-mail: yzz19980802@163.com.

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