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Development of anion exchange membranes (AEMs) with good performance, such as high conductivity, good alkaline stability and mechanical strength, has been a hot topic for the fuel cell application. Here, a novel kind of hyperbranched cross‐linker decorated with quaternary ammonium groups was introduced to polybenzimidazole (PBI) membranes and QOPBI‐x membranes (where x is the weight ratio of the hyperbranched...
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