Efficient chitosan-based alkaline anion exchange composite membrane as well as preparation method and application thereof

Abstract

The invention provides an efficient chitosan-based alkaline anion exchange composite membrane as well as a preparation method and application thereof. The efficient chitosan-based alkaline anion exchange composite membrane is characterized by comprising chitosan and a polymer of water soluble chlorinated-1-vinyl-3-methyl-1H-imidazole containing a quaternary ammonium base and 1-vinyl-2-pyrrolidone. The membrane provided by the invention is not only environmental friendly, easily available in raw materials and low in cost, but also mild in reaction condition and short in reaction time, has the advantages of being simple and practical in process, strong in operability and the like, and is easy for scaled production. An excellent membrane appearance and a surface structure of a compact membrane can be obtained in a temperature range of 110-150 DEG C by using a physical crosslinking method. Meanwhile, the conductivity at 80 DEG C can reach 10<-2>S / cm, and the alkali-resisting stability in a 8M KOH solution at 85 DEG C can reach 300 hours, so that excellent electrochemical properties and alkali-resisting stability are displayed. The efficient chitosan-based alkaline anion exchange composite membrane provided by the invention can be used for a membrane electrode of an alkaline fuel cell, a diaphragm of a metal-air cell and a diaphragm material of a CO2 electrochemical reduction electrolytic tank.

Description

technical field [0001] The invention belongs to the field of alkaline membrane and its preparation and application, in particular to a green and efficient alkaline anion exchange composite membrane and its preparation and application. Background technique [0002] In recent years, polymer electrolyte fuel cells have attracted extensive attention due to their high efficiency and clean characteristics. Among different types of polymer electrolyte fuel cells, proton exchange membrane fuel cells have been widely used in the fields of automobiles, buses, and mobile communication equipment. However, before large-scale commercialization, this technology still faces disadvantages such as high price, slow anode reaction kinetics, high methanol permeability, and the use of noble metal catalysts. For example, the proton exchange membrane produced by DuPont Company of the United States It has excellent chemical, electrochemical and mechanical stability and is widely used. However, ...

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Problems solved by technology

The above-mentioned skeletons are all artificially synthesized organic polymers, which will cause certain pollution to the environment and the preparation process of these anion exchange membranes is complicated, and at the same time, they are unstable under high-concentration lye, especially at higher temperatures (greater than 60°C). The performance of the membrane decreases or even the membrane degrades, and the mechanical strength of the membrane decreases sharply.

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