Preparation method for fuel cell compound proton exchange membrane enhanced by using SiO2 three-dimensional ultra-thin membrane

Abstract

The invention relates to a preparation method for a fuel cell compound proton exchange membrane enhanced by using an SiO2 three-dimensional ultra-thin membrane, comprising the following steps: polymerizing and splitting phase of the epoxy resin and the amine in the polyethylene glycol medium by a certain weight ratio at a certain temperature and obtaining the epoxy resin micro filtering membrane;performing the in situ hydrolysis to the tetraethoxysilane in the template pore channel of the epoxy resin micro filtering membrane, and forming the compound membrane of the three-dimensional SiO2 continuous phase coating epoxy resin; and removing the epoxy resin by high temperature calcination and forming the three-dimensional SiO2 ultra-thin micro pore membrane; and then casting the perfluorinated sulfonic resin solution with a certain amount on the three-dimensional SiO2 ultra-thin micro pore membrane, and heating and volatilizing the solvent; heating under the vacuum atmosphere, and obtaining the compound proton exchange membrane enhanced by using an SiO2 ultra-thin micro pore membrane after washing with de-ionized water. The compound membrane has the structure that the SiO2 and the perfluorinated sulfonic resin are in two-phase continuous interpenetrating polymer network; the SiO2 content is high; the side stability and mechanical performance in wet and dry states are good; and the invention has the characteristics of high moisture holding capability, high-temperature resistance and cell work efficiency at high temperature.

Description

technical field [0001] The patent of the present invention relates to the preparation method and application field of the proton exchange membrane in the key material of the fuel cell. Specifically, it relates to a preparation method of a composite proton exchange membrane reinforced by a silicon dioxide three-dimensional ultrathin microporous membrane. Background technique [0002] A fuel cell is an electrochemical power generation device that directly converts the chemical energy stored in fuel and oxidant into electrical energy without a heat engine. It is considered to be one of the clean, efficient, energy-saving and environmentally friendly power generation technologies in the future. The United States has identified fuel cells as one of the 27 must-develop technologies that are critical to economic prosperity and national security in the 21st century. In 2006, the State Council of the People's Republic of China issued the "National Medium- and Long-Term Science and T...

AI Technical Summary

Problems solved by technology

Overall, the composite films obtained by these two preparation methods have poor reproducibility, SiO 2 The particle size, distribution degree and its dispersion in the film are difficult to be uniform, and they are dispersed in isolated islands, with poor continuity, and SiO 2 Low content

SiO in the composite film 2 When the content is more than 10%, the texture of the composite film is very brittle, the mechanical strength decreases, and even the film cannot be formed, which is not suitable for assembly and application

Therefore, although experimental studies have shown that this method can improve the water retention capacity, high temperature resistance and battery efficiency of perfluorosulfonic acid membranes at high temperatures, it is still difficult to apply commercially until the above problems are solved. The advantages of this composite proton exchange membrane loaded with hydrophilic oxides

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