Hydrogel-based medium-high temperature PEM (Proton Exchange Membrane), preparation method thereof and application of hydrogel-based medium-high temperature PEM

Abstract

The invention provides a hydrogel-based medium-high temperature PEM (Proton Exchange Membrane), a preparation method thereof and the application of the hydrogel-based medium-high temperature PEM. The preparation method is characterized by comprising the following steps of: forming a SEMI-IPN / IPN (Interpenetrating Polymer Network) structure through the auto polymerization of a hydrophilic monomer or through the hydrophilic monomer and hydrophilic high polymers, adsorbing proton conductor water solution and preparing the hydrogel-based medium-high temperature PEM through vacuum drying. The proton conductivity of a synthetic hydrogel-based PEM can be up to 0.02-0.09 S.cm<-1> under 180 DEGC and anhydrous environment. The preparation method provided by the invention is different from a preparation method of the traditional PEM mixed with the proton conductor; and according to the preparation method provided by the invention, the proton conductor is adsorbed into a three-dimensional network structure of a hydrogel thin membrane by fully utilizing the unique adsorptivity, the porous structure and the retentivity of the hydrogel thin membrane and is firmly sealed. According to the hydrogel-based medium-high temperature PEM provided by the invention, the adsorbing capacity of the proton conductor is large, the proton conductivity is high, the operating temperature range is wide, the operation method is simple, convenient and easy, the cost is low, and the improvement space is large.

Description

technical field [0001] The invention belongs to the field of new material technology and new preparation technology, and specifically relates to a novel hydrogel-based medium-high temperature proton exchange membrane and its preparation method and application. Background technique [0002] Proton exchange membrane is a solid polymer electrolyte membrane with good proton conductivity, used to transport protons. Proton exchange membrane is a kind of proton conductive film formed by swelling, sulfonation or compounding with proton conductor by polymer or polymer composite. [0003] Proton exchange membranes originated from polyphenylene sulfonic acid membranes produced by GE in the early 1960s, but their stability and conductivity were poor, and they were soon replaced by Nafion membranes developed by DuPont. Due to the high price of Nafion membrane, low catalyst activity caused by low operating temperature, and low battery output power, Nafion-based proton exchange membrane f...

AI Technical Summary

Problems solved by technology

Limited to the degree of protonation and retention of PBI, the loading of phosphoric acid is low and the long-term washing of water generated by the cathode in the fuel cell leads to serious loss of phosphoric acid