High Performance Anion Exchange Membranes with Confined Sub-2-nm Ion Channel

摘要

As a key component of low-cost anion exchange membrane fuel cells(AEMFCs), anion exchange membranes (AEMs) are far from commercialapplication, because of dissatisfactory alkaline stability and conductivity.Herein, a new insight is proposed to prepare high performance AEMs byconstructing of confined ion channel. With an intermediate oligomerproduced before the main copolymerization, novel poly(vinyl-carbazolyl arylpiperidinium) AEMs with confined sub-2-nm ion channel are successfullyprepared. The unique sub-2-nm ion channel enable membranes ultrahighhydroxide conductivity of 261.6 mS cm~（?1）, and the state-of-the-art chemicalstability over 5000 h. Moreover, the AEMs also exhibit good mechanicalstability with lower water uptake and dimensional swelling. Based on theas-prepared AEMs and ionomer, fuel cells exhibit outstanding peak powerdensity of 1.8 and 0.2 W cm~（?2） with Pt-based catalysts and completelynon-precious metal catalysts, respectively.