Low permeability composite proton exchange membrane including organic-inorganic hybrid

Abstract

A composite proton exchange membrane is made up of dispersed organized graphene in ion conducting polymer as a fuel barrier material. The composite proton exchange membrane includes an inorganic material of 0.001-10 wt % and an organic material of 99.999-90 wt %. The inorganic material is a graphene derivative with two-dimensional structure. The organic material includes a polymer material with sulfonic acid group.

Description

technical field [0001] The invention relates to a proton exchange membrane, in particular to an organic-inorganic hybrid composite proton exchange membrane with low permeability. Background technique [0002] A fuel cell (Fuel Cell, FC) is a power generation device that uses chemical energy to be directly converted into electrical energy. Compared with traditional power generation methods, fuel cells have low pollution, low noise, high energy density, and high energy conversion efficiency. The advantage is that it is a very future-looking clean energy, which can be applied in various fields such as portable electronic products, household power generation systems, transportation tools, military equipment, space industry, and small power generation systems. [0003] Various types of fuel cells have different application markets depending on their operating principles and operating environments. The applications in mobile energy are mainly hydrogen proton exchange membrane fuel...

AI Technical Summary

Problems solved by technology

[0005] However, the membrane electrode assembly (MEA) of direct methanol fuel cells faces problems such as short battery life and power generation efficiency degradation due to the phenomenon of methanol crossover.

In existing fuel cells, the anode structure has the problem of penetration of liquid, colloidal, solid, or gaseous organic fuels (such as alcohols such as methanol, aldehydes, or acids), such as part of the fuel and water passing through the anode It does not react with the catalyst, but directly passes through the proton exchange membrane to reach the cathode, resulting in a reduction in the catalytic reaction capacity of the cathode

In addition, the fuel undergoes an oxidation reaction at the cathode catalyst, and the reduction reaction of the surrounding oxygen together forms a mixed potential phenomenon, which causes the output voltage of the fuel cell to drop.

This not only reduces the output power of the fuel cell, but also reduces the efficiency of fuel use

In addition, the penetrating fuel will also cause the electrode binder between the proton exchange membrane and the cathode to swell and accelerate the aging of the cathode structure

[0006] In view of the problem of methanol penetration is the main factor that causes the poisoning of the cathode catalyst and affects the durability of the battery, and the occurrence of mixed potential causes the output power to drop

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