Inorganic/organic composite proton fuel cell exchange membrane and preparation thereof

Abstract

The invention provides an improvement to an inorganic / organic composite proton fuel cell exchange membrane and a preparation method thereof, which is characterized in that the inorganic / organic composite is composed by embedding perfluoro sulfonated polymer or non-perfluoro sulfonated polymer into SiO2 and / or TiO2 of a three-dimensional mesh structure. Inorganic particles form into a network structure with each other in the membrane, so as to not only enhance the mechanical strength of the composite membrane but also to obtain the composite membrane with good moisture, thereby effectively solving the contradiction between the proton exchange membrane and high conductivity rate at high temperatures, therefore, not only the obtained composite membrane has characteristics of high temperature and high conductivity rate, lower swelling rate of water absorption and the like, but also mechanical strength and thermal stability of the composite membrane can be correspondingly increased so as to improve the service life. The obtained membrane structure is characterized in that: the inorganic particles represent an orderly, uniform and open three-dimensional mesh structure, and the organic polymer substance of the conductive proton is filled in the three-dimensional mesh of the inorganic particles. The structural characteristic provides a good space configuration for adulterating other conductive substances (such as heteropoly acid). The inorganic / organic composite proton fuel cell exchange membrane has advantages that the obtained composite membrane is not only superior in performance, but also plays an important role in improving the performance of the fuel cell and reducing the battery costs, in addition, enriches the preparation technology of proton exchange membranes.

Description

technical field [0001] The invention relates to an inorganic / organic composite proton fuel cell exchange membrane and a preparation method, in particular to the improvement of the existing inorganic / organic composite membrane and the preparation method. Background technique [0002] The proton membrane is a key component of the fuel cell and is also the component that accounts for the largest cost. At present, the proton membrane of the fuel cell is mainly a perfluorosulfonic acid polymer membrane, such as the Nafion series (US3,282,875; US 4,330,645) of DuPont Company. However, due to the high price of perfluorosulfonic acid membranes, its application is limited. In recent years, in order to bring proton fuel cells into practical application as soon as possible, scientists have been working hard to synthesize an ideal proton membrane, so doped polybenzimidazole, sulfonated polyphosphate, sulfonated polysulfone, sulfonated Polyetheretherketone film, etc. (J.Yu, B.Yi, et al...

AI Technical Summary

Problems solved by technology

However, due to the small specific surface of inorganic particles, these particles are isolated from each other in the film, and their own electrical conductivity is low, the improvement of the performance of the material is not ideal. For example, the mechanical strength of the obtained composite film is low, and the moisture retention performance is still not ideal. , short service life, has become the main defect of inorganic / organic composite proton exchange membrane

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