Dimethylimidazolium-functionalized polybenzimidazole and its organic–inorganic hybrid membranes for anion exchange membrane fuel cells

Li Cheng Jheng, Cheng Wei Cheng, Ko Shan Ho, Steve Lien Chung Hsu, Chung Yen Hsu, Bi Yun Lin, Tsung Han Ho

研究成果: Article同行評審

11 引文 斯高帕斯(Scopus)

摘要

A quaternized polybenzimidazole (PBI) membrane was synthesized by grafting a dimethylimidazolium end-capped side chain onto PBI. The organic–inorganic hybrid membrane of the quaternized PBI was prepared via a silane-induced crosslinking process with triethoxysilylpropyl dimethylimidazolium chloride. The chemical structure and membrane morphology were characterized using NMR, FTIR, TGA, SEM, EDX, AFM, SAXS, and XPS techniques. Compared with the pristine membrane of dimethylimidazolium-functionalized PBI, its hybrid membrane exhibited a lower swelling ratio, higher mechanical strength, and better oxidative stability. However, the morphology of hydrophilic/hydrophobic phase separation, which facilitates the ion transport along hydrophilic channels, only successfully developed in the pristine membrane. As a result, the hydroxide conductivity of the pristine membrane (5.02 × 10−2 S cm−1 at 80C) was measured higher than that of the hybrid membrane (2.22 × 10−2 S cm−1 at 80C). The hydroxide conductivity and tensile results suggested that both membranes had good alkaline stability in 2M KOH solution at 80C. Furthermore, the maximum power densities of the pristine and hybrid membranes of dimethylimidazolium-functionalized PBI reached 241 mW cm−2 and 152 mW cm−2 at 60C, respectively. The fuel cell performance result demonstrates that these two membranes are promising as AEMs for fuel cell applications.

原文English
文章編號2864
期刊Polymers
13
發行號17
DOIs
出版狀態Published - 2021 9月 1

All Science Journal Classification (ASJC) codes

  • 一般化學
  • 聚合物和塑料

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