Method and device for preparing ultrathin plasma polymerization sulfonic proton exchange membrane

Abstract

The invention relates to a method for preparing a novel ultrathin plasma polymerization sulfonic proton exchange membrane. Styrene and a trifluoromethanesulfonic acid monomer are subjected to polymerization reaction under the action of plasma and are deposited on the surface of an electrode to form an ultrathin compact plasma polymerization proton exchange membrane. The proton exchange membrane prepared by using the method has high sulfonic group content and higher thermal stability and chemical stability, and the service life and the working time of the proton exchange membrane in a fuel cell are prolonged. Contact resistance of the membrane and the electrode and a conduction path of protons are reduced, and performance of the fuel cell is improved; and anti-diffusion capacity of a product from a cathode side to an anode side is enhanced, and self-humidification capacity of a novel membrane electrode is improved. The plasma polymerization proton exchange membrane has higher proton conductivity and lower methanol permeability.

Description

technical field [0001] The invention relates to the technical field of proton exchange membrane fuel cells, in particular to a preparation method and device for an ultrathin plasma polymerized sulfonic acid matrix proton exchange membrane. Background technique [0002] Reducing the cost of fuel cells, realizing the miniaturization of fuel cells, developing micro-polymer electrolyte membrane fuel cells, expanding the scope of application (such as making fuel cells widely used in portable electronic devices), and improving the performance and life of fuel cells are the current international focus of research. The key is the production of proton exchange membranes and new electrodes, which are the core materials of fuel cells. The proton exchange membrane is not only the core material of the fuel cell, but also an essential component of the chlor-alkali industry, sensors, etc. Most of the current commercial fuel cells use foreign-produced perfluorosulfonic acid proton exchang...

AI Technical Summary

Problems solved by technology

However, our country has not yet entered into industrialization and relies on imports

Nafion series perfluorosulfonic acid membranes have the advantages of high mechanical strength, good chemical stability, large proton conductance (when the water content is large), high power density, long service life, etc., but there are also the following disadvantages: Requirements for temperature and water content high

[0006] Although some progress has been made in improving membrane performance by different methods, such as high-temperature proton conductivity, methanol permeability, etc., it must be used in fuel cells to replace Nafion perfluorosulfonic acid membranes and achieve the goal of civilian use. Further improve the proton conductivity of the membrane and solve the problem that the ultra-thin structure of the membrane is likely to cause a short circuit between the membrane and the electrode

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