Abstract
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−1) is achieved compared to that of non-hyperbranched AEMs (180 mS cm−1). Furthermore, the hyperbranched AEMs exhibit excellent fuel cell and water electrolysis performance, with a peak power density of 1.53 W cm−2 in AEMFCs and a current density of 1 A cm−2 at a voltage of 2 V in AEMWEs, respectively.
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