Cation–dipole interaction that creates ordered ion channels in an anion exchange membrane for fast OH− conduction

Precise control over polyelectrolyte architecture, engineered for self‐assembly of ion‐conducting channels, is of fundamental and technological importance to many fields, for example, fuel cells and redox flow batteries and electrodialysis. Building on recent advances with the supramolecular chemist...

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Veröffentlicht in:AIChE journal 2021-04, Vol.67 (4), p.n/a
Hauptverfasser: Zhang, Jianjun, He, Yubin, Zhang, Kaiyu, Liang, Xian, Bance‐Soualhi, Rachida, Zhu, Yuan, Ge, Xiaolin, Shehzad, Muhammad A., Yu, Weisheng, Ge, Zijuan, Wu, Liang, Varcoe, John Robert, Xu, Tongwen
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container_issue 4
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container_title AIChE journal
container_volume 67
creator Zhang, Jianjun
He, Yubin
Zhang, Kaiyu
Liang, Xian
Bance‐Soualhi, Rachida
Zhu, Yuan
Ge, Xiaolin
Shehzad, Muhammad A.
Yu, Weisheng
Ge, Zijuan
Wu, Liang
Varcoe, John Robert
Xu, Tongwen
description Precise control over polyelectrolyte architecture, engineered for self‐assembly of ion‐conducting channels, is of fundamental and technological importance to many fields, for example, fuel cells and redox flow batteries and electrodialysis. Building on recent advances with the supramolecular chemistry, we introduce inter/intra‐molecular cation–dipole interactions between pendent quaternary ammoniums cations and polar polyethylene glycol grafts in an anion‐exchange membrane (AEM). Such interactions lead to desirable, ordered ion‐conducting pathways when in the membrane form. Comparison of the results of molecular dynamics simulation with 1H NMR and nano‐scale microscopy analyses show that the cation–dipole interactions enhance self‐assembly and the formation of interconnected ionic network domains, providing three‐dimensional pathways for both water and ion transport. The resultant AEM exhibits high OH− conductivity (49 mS cm−1 at 30°C) and a completive peak power density of 622 mW cm−2 at 70°C when tested in a H2/O2 single‐cell alkaline membrane fuel cell.
doi_str_mv 10.1002/aic.17133
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subjects Anion exchange
Anion exchanging
anion‐exchange membranes
Assembly
Batteries
Cations
cation–dipole interaction
Conduction
Dipole interactions
Electrodialysis
Fuel cells
Fuel technology
ion channel
Ion channels
Ion transport
Membranes
Molecular dynamics
NMR
Nuclear magnetic resonance
polyelectrolyte
Polyelectrolytes
Polyethylene glycol
Rechargeable batteries
title Cation–dipole interaction that creates ordered ion channels in an anion exchange membrane for fast OH− conduction
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