Development of a proton exchange membrane based on trifluoromethanesulfonylimide-grafted polybenzimidazole

被引：0
作者：
Hoon Han
Hiroto Miura
Yuki Motoishi
Naoki Tanaka
Tsuyohiko Fujigaya
机构：
[1] Kyushu University,Department of Applied Chemistry, Graduate School of Engineering
[2] Kyushu University,The World Premier International Research Center Initiative, International Institute of Carbon Neutral Energy Research
[3] Kyushu University,Department of Chemical Engineering, Graduate School of Engineering
[4] Kyushu University,Center for Molecular Systems
来源：
Polymer Journal | 2021年 / 53卷
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摘要：
Trifluoromethanesulfonylimide-grafted polybenzimidazole (PBI-TFSI) was synthesized for proton exchange membrane (PEM) applications. Its proton conductivity was (a) less dependent on humidity and (b) higher than that of conventional fluorine-based PEM (Nafion) and propanesulfonic acid-grafted PBI (PBI-PS) at a relative humidity of 40%. The chemical structure of PBI-TFSI was investigated using 1H and 19F nuclear magnetic resonance and Fourier transform infrared spectroscopy. The membranes exhibited good transparency, flexibility, and thermal stability up to 350 °C. Membranes with different side chain grafting ratios were prepared, and the water uptake and hydration number of the PBI-TFSI membranes were lower than those of the PBI-PS membranes, most likely because of the hydrophobicity of the side chain. The higher proton concentration provided by TFSI with stronger acidity than PS might be the reason for the higher proton conductivities of PBI-TFSI.
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页码：1403 / 1411
页数：8
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