The efficiency of ion transport in solid polyelectrolytes is significantly hindered by tight polymer chain entanglement compared to that in liquids. In this study, a series of hyperbranched poly(aryl piperidinium) anion exchange membranes (AEMs) with 1,3,5-triacetylbenzene as a branching point were synthesized. The hyperbranched structure results in weaker chain entanglement and a larger interchain correlation distance, leading to a higher fractional free volume, thereby greatly reducing ion transport resistance. Consequently, a remarkably higher OH conductivity of the as-prepared hyperbranched AEM (296 mS cm) is achieved compared to that of non-hyperbranched AEMs (180 mS cm). Furthermore, the hyperbranched AEMs exhibit excellent fuel cell and water electrolysis performance, with a peak power density of 1.53 W cm in AEMFCs and a current density of 1 A cm at a voltage of 2 V in AEMWEs, respectively.

中文翻译：

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通过在阴离子交换膜中引入高自由体积分数来降低氢氧根传输阻力

与液体中的离子传输相比，固体聚电解质中的离子传输效率受到紧密的聚合物链缠结的显着阻碍。本研究合成了一系列以1,3,5-三乙酰苯为支化点的超支化聚芳基哌啶阴离子交换膜（AEM）。超支化结构导致链缠结较弱，链间相关距离较大，从而导致自由体积分数较高，从而大大降低了离子传输阻力。因此，与非超支化 AEM (180 mS cm) 相比，所制备的超支化 AEM (296 mS cm) 具有显着更高的 OH 电导率。此外，超支化AEM表现出优异的燃料电池和水电解性能，AEMFC中的峰值功率密度为1.53 W cm，AEMWE中2 V电压下的电流密度分别为1 A cm。