Abstract
Anion exchange membranes (AEMs) are the core components of water electrolysis and suffer from the critical obstacles such as low ionic conductivity and poor alkali resistance stability in practical applications. In this work, a series of AEMs based on poly(arylene ether nitrile)s with high-density quaternary ammonium cationic side chains (PAEN-DQA-x) are synthesized to optimize the conductivity and alkali resistance stability. Their surface morphology and microstructure are characterized by scanning electron microscopy and atomic force microscopy, respectively. The obtained AEMs exhibit good conductivity and the values are in the range of 76.13–119.72 mS/cm at 80 °C. The conductivity retention for the representative PAEN-DQA-0.35 membrane is up to 73% after immersion in 2 M NaOH at 80 °C for 480 h. The current density of the water electrolyzer by PAEN-DQA-0.35 reaches 521.3 mA/cm2 at 2.0 V, and it also remains good stable at a current density of 500 mA/cm2 in a 0.1 M KOH environment.
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