Inorganic/organic alternation type composite proton exchange membrane and preparation method thereof

Abstract

The invention discloses an inorganic / organic alternation type composite proton exchange membrane and a preparation method thereof. The method specifically comprises the steps of preparing sol containing inorganic proton conductive components by a sol-gel process; adding the sol into a solution containing organic polymer components to uniformly mix the inorganic components with the organic components; performing condensation polymerization to obtain a net structure with mutually alternated inorganic / organic molecules. In the method disclosed by the invention, an inorganic / organic alternation type composite proton exchange membrane is prepared by a mode of solution blending first and condensation polymerization later; compared with the mode of adding inorganic components into an organic matter in a form of powder, the inorganic and organic components are distributed more uniformly in a three-dimensional space. The composite proton exchange membrane prepared by the method disclosed by the invention integrates the proton conductivity, toughness, dimensional stability, heat resistance and good mechanical strength, and is expected to be widely applied to the fields such as fuel cells, all vanadium flow batteries, chlorine alkali industry electrolysis, super-capacitors, sensors and the like.

Description

technical field [0001] The invention relates to a material preparation method in the technical field of composite materials, in particular to an inorganic / organic interspersed composite proton exchange membrane and a preparation method thereof. Background technique [0002] Proton exchange membranes are key materials for new energy devices such as fuel cells and all-vanadium redox flow batteries, as well as for the chlor-alkali industry. Perfluorosulfonic acid organic polymer membranes (such as Nafion membranes), whose main components are high-fluorine polymers, have high material and synthesis costs, resulting in high prices; disposal of waste membranes after use is difficult, and the environmental burden is heavy; and water absorption is easy to swell, etc. , there are a series of limiting factors. New organic proton exchange membranes, inorganic proton exchange membranes, and inorganic / organic composite proton exchange membranes are being extensively studied by researche...

AI Technical Summary

Problems solved by technology

From the perspective of the membrane itself, since the inorganic materials used to improve the proton conductivity are dispersed in the polymer membrane material in granular form, the composite proton exchange membrane prepared also has shortcomings: the proton conduction between the inorganic materials is discontinuous , and the inorganic-organic mixture is purely mechanical, and there is a certain interface resistance; the dispersed inorganic particles cannot well restrain the swelling of the organic framework

These will affect the proton conductivity and practical performance of the composite proton exchange membrane

From the perspective of preparation methods, the preparation of inorganic powders of a certain size and ball milling and dispersion all make the preparation of materials complicated and costly.

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