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- W3198429050 abstract "Highly conductive anion-exchange membranes (AEMs) are desirable for applications in various energy storage and conversion technologies. However, conventional AEMs with bulky HCO 3 - or Br - as counterion generally exhibit low conductivity because the covalent bonding restrains the tethered cationic group’s mobility and rotation. Here, we report an alternative polyrotaxane AEM with nontethered and free-shuttling phosphonium cation. As proved by temperature-dependent NMR, solid-state NMR, and molecular dynamics simulation, the phosphonium cation possesses a thermally trigged shuttling behavior, broader extension range, and greater mobility, thus accelerating the diffusion conduction of bulky anions. Owing to this striking feature, high HCO 3 - conductivity of 105 mS cm -1 at 90°C was obtained at a relatively lower ion-exchange capacity of 1.17 mmol g -1 . This study provides a new concept for developing highly conductive anion-exchange membranes and will catalyze the exploration of new applications for polyrotaxanes in ion conduction processes." @default.
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- W3198429050 date "2021-01-01" @default.
- W3198429050 modified "2023-10-13" @default.
- W3198429050 title "Fast Bulky Anion Conduction Enabled by Free Shuttling Phosphonium Cations" @default.
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- W3198429050 doi "https://doi.org/10.34133/2021/9762709" @default.
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