Preparation method of anion exchange membrane applied to electrochemical reduction of carbon dioxide based on post-crosslinking quaternary phosphonium

The invention discloses a preparation method of a quaternary phosphonium salt post-crosslinking modified polymer anion exchange membrane applied to an electrochemical reduction carbon dioxide reaction, and belongs to the technical field of membranes. According to the invention, the quaternary phosphonium salt compound is introduced into the polymeric membrane prepared by a tape casting method by innovatively adopting a one-step simple post-treatment process, so that the anion exchange membrane with high crosslinking degree is prepared; the anion exchange membrane prepared by the preparation method disclosed by the invention shows relatively high ionic conductivity which is up to 24.1 mS/cm in practical application, and shows relatively high chemical stability and relatively high ion exchange capacity in an experiment process; in addition, the anion exchange membrane also has relatively good mechanical properties; according to the method, the anion exchange membrane is prepared by adopting a one-step post-cros