Proton exchange film and its preparation method

A proton exchange membrane and electrolyte technology, applied in the field of ion exchange membranes, can solve the problems of lower raw material utilization efficiency, restrictions on large-scale commercial production of proton exchange membrane fuel cells, catalyst poisoning, etc.

Inactive Publication Date: 2003-04-16
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

Due to the structural characteristics of the polymer and the characteristics of the technical route in the synthesis process, there are inevitably voids in the film produced, and some hydrocarbons with suitable properties can directly pass through the voids; reducing the utilization efficiency of raw materials
[0005] (3) Catalyst poisoning
[0006] These shortcomings limit the large-scale commercial production of proton exchange membrane fuel cells

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] Choose a metal aluminum film with a thickness of h=100um, use a laser to drill holes on the entire film, and the aperture n=0.1mm will make the pore pipes straight and perpendicular to the surface of the film pores, and then use the anodic oxidation method to oxidize the surface of the microporous aluminum film into a ceramic film, and then filled with 20% H 2 SO 4 of silica sol. In this embodiment, other oxidation methods may also be used to oxidize the surface of the porous aluminum membrane into a ceramic membrane, or to fill it with other high-conductivity electrolytes.

[0018] The pore diameter n is preferably on the order of nanometers, that is, n≤1um, and the effect of the present invention is the best at this time. In the present invention, various existing methods can be used to drill holes on the metal film, such as laser drilling or electrochemical corrosion. Various existing methods can also be used to oxidize the surface of the microporous metal membran...

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Abstract

This invention discloses a proton exchange film and its preparation method. The film is made of a ceramic thin film with thickness of h is less than or equal to 1mm and distributed with several microholes on it with the diameter n is less than or equal to 2mm, distributed on the whole thin film and fully filled with high conductivity electrolyte. Diameter of hole n is better is nanometer degree. The preparation method is as follow: first to prepare ordered microholes on the metal film with thickness in h is less than or equal to 1mm to be oxidated to ceramic film by electrochemical or other ways, then to fill with high conductivity electrolyte. The above mentioned metal film is better A1 film with the advantage of easy filming, low cost solving the problem of catalyst poisoning by increasing operation temperature of the proton exchange film.

Description

technical field [0001] The invention belongs to the technical field of ion exchange membranes, in particular to a proton exchange membrane, which is especially suitable for fuel cells. Background technique [0002] Preparation of high-efficiency ion-exchange membranes is one of the core technologies of fuel cells. At present, most of the exchange membranes used in proton exchange membrane fuel cells (PEMEC) use multi-(per)fluorosulfonic acid polymer Nafion series membranes. However, Nafion series membranes have the following disadvantages: [0003] (1) Film formation is difficult and costly. Nafion series membranes are perfluoropolymers with complex structures. The sulfonation and synthesis of perfluorinated substances are very difficult, and the hydrolysis and sulfonation during the film formation process can easily denature and degrade the polymer, making film formation difficult and resulting in higher costs. [0004] (2) Conduction to certain hydrocarbons. Due to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/94
CPCY02E60/50
Inventor 索进平崔崑钱晓良孙尧卿
Owner HUAZHONG UNIV OF SCI & TECH
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