Urea-based construction of hydrogen bonding networks for poly(biphenyl alkylene)s anion exchange membrane for fuel cells
Yiman Gu , Xiaoyu Chi , Tianming Dong , Yanchao Zhang , Zhanyu Li , Zhe Wang
Carbon Neutralization ›› 2024, Vol. 3 ›› Issue (6) : 1092 -1100.
Urea-based construction of hydrogen bonding networks for poly(biphenyl alkylene)s anion exchange membrane for fuel cells
In recent decades, the “trade-off” problem of anion exchange membranes (AEMs) has been a concern. Herein, a series of urea-based multication poly (biphenyl alkylene)s AEMs are prepared by obtaining an ether bond-free backbone through ultra-strong acid catalysis, grafting it with multication side chains, and then by accessing urea-based groups in different ratios. By accessing the urea group, noncovalent bonds are used to link the molecules to act as cross-links, giving them solubility that chemical cross-links do not have. The PBTA-DQA-35U membrane possessed the highest ionic conductivity of 62.43 mS/cm. Compared with the PBTA-DQA membrane (80°C, WU= 20.45%, SR = 17.67%), the PBTA-DQA-25U membrane showed an increase in water uptake but not much change in swelling (WU = 30.23%, SR = 19.36%), which was attributed to the fact that the hydrophilic urea groups provide cation transport sites while hydrogen bonding inhibits membrane swelling. The PBTA-DQA-35U ionic conductivity is retained above 75% after 960 h of alkali stability testing. The power density of the MEA device assembled using PBTA-DQA-35U membrane is 421.78 mW/cm2.
anion exchange membranes / hydrogen bonding networks / multication / urea groups
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2024 The Authors. Carbon Neutralization published by Wenzhou University and John Wiley & Sons Australia, Ltd.
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