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Organic-inorganic compoiste proton exchange film and preparing method

A proton exchange membrane and composite technology, which is used in the field of organic-inorganic composite proton exchange membranes for direct methanol fuel cells and their preparation, can solve the problem of small phase separation between hydrophilic and hydrophobic phases, changes in the three-dimensional size of the membrane, and the Mechanical strength reduction and other problems, to achieve the effects of excellent alcohol resistance, narrow proton channel, and simple preparation method

Inactive Publication Date: 2009-06-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with perfluorosulfonic acid membranes, this kind of sulfonated arylene main chain polymer proton exchange membrane is cheap, has high proton conductivity and good thermal stability; but when it is applied in DMFC, its resistance There are still obvious deficiencies in alcohol performance: (1) Although this type of sulfonated polymer has improved alcohol resistance performance compared with perfluorosulfonic acid membrane due to its narrow proton channel and more branched structure, but in The practical application of DMFC is still insufficient; (2) due to the small degree of phase separation between the hydrophilic phase and the hydrophobic phase in this type of sulfonated polymer membrane, and the water absorption of the membrane increases significantly with the increase of temperature, so at a higher temperature When the temperature is high, the membrane will swell, the three-dimensional size of the membrane will change greatly, and the mechanical strength of the final membrane will decrease.

Method used

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  • Organic-inorganic compoiste proton exchange film and preparing method
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Sulfonation of polymer: in parts by weight, dissolve 1 part of polyetheretherketone (PEEK) pellets in 50 parts by weight of concentrated sulfuric acid with a concentration of 95 to 98%, and stir vigorously at 20°C. After 48 hours of continuous sulfonation, the reaction solution was poured into ice water, the volume of ice water was at least 5 times that of the reaction solution. After the product was filtered, it was washed repeatedly with distilled water until the pH was neutral, and finally vacuum-dried at 60°C for 24 hours. Obtain sulfonated polymer;

[0023] (2) Organic modification of montmorillonite: disperse montmorillonite (MMT) in water, make a suspension with a concentration of 5% by weight, stir vigorously for 1 hour, let it stand for swelling for 24 hours, and take the upper suspension solution, and cetyltrimethylammonium chloride was added, the molar ratio of the organic intercalation agent to the metal cation between the montmorillonite sheets was 2:1,...

Embodiment 2

[0030] (1) Sulfonation of polymers: in parts by weight, 1 part of polyphenylene ether pellets was dissolved in 30 parts by weight of concentrated sulfuric acid with a concentration of 95-98%, vigorously stirred at 50°C, and continuously sulfonated for 10 After 1 hour, pour the reaction solution into ice water, the volume of ice water is at least 5 times that of the reaction solution. After the product is filtered, it is washed repeatedly with distilled water until the pH is neutral. Finally, it is vacuum-dried at 60°C for 24 hours to obtain sulfonated polymer thing;

[0031] (2) Organic modification of montmorillonite: disperse montmorillonite (MMT) in water, make a suspension with a concentration of 10% by weight, stir vigorously for 1 hour, let it stand for swelling for 24 hours, and take the upper suspension solution, and dodecyltrimethylammonium chloride was added, the molar ratio of the organic intercalation agent to the metal cation between the montmorillonite sheets was...

Embodiment 3

[0036] (1) Sulfonation of polymers: in parts by weight, dissolve 1 part of polyphenylene sulfide pellets in 40 parts by weight of concentrated sulfuric acid with a concentration of 95-98%, stir vigorously at 30°C, and continue sulfonation After 20 hours, pour the reaction solution into ice water. The volume of ice water is at least 5 times that of the reaction solution. After the product is filtered, it is washed repeatedly with distilled water until the pH is neutral. Finally, it is vacuum-dried at 60°C for 24 hours to obtain the sulfonated polymer;

[0037] (2) Organic modification of montmorillonite: disperse montmorillonite (MMT) in water, make a suspension with a concentration of 10% by weight, stir vigorously for 1 hour, let it stand for swelling for 24 hours, and take the upper suspension solution, and dodecyltrimethylammonium chloride was added, the molar ratio of the organic intercalation agent to the metal cation between the montmorillonite sheets was 1.5:1, stirred ...

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Abstract

In the method, sulfonated polymer is dissolved in organic solvent. Added organic modified montorillonite clay is dispersed on basal body of polymer evenly. Membrane is formed through slobbering method. Through drying and stripping membrane in water produces membrane needed. Solving difficult problem of methanol infiltration of proton exchange membrane in use for direct fuel cell of methanol, the invention possesses features of simpler technique, and low cost of material etc.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to an organic-inorganic composite proton exchange membrane for direct methanol fuel cells and a preparation method thereof. Background technique [0002] Direct methanol fuel cell (DMFC) has the advantages of high energy density, environmental friendliness, and safe and convenient fuel storage and transportation. At present, DMFC still uses DuPont's Nafion series perfluorosulfonic acid membrane as the proton exchange membrane (PEM). Although this type of perfluorosulfonic acid membrane has high proton conductivity, chemical stability, thermal stability and mechanical strength, it has the disadvantage of severe alcohol penetration and poor alcohol resistance, which greatly limits the development of DMFC. and apply. [0003] At present, arylene main chain polymers with good heat resistance have become an important class of matrix materials for the preparation of PEMs. For exampl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/10C08J5/22H01M4/94H01M8/1011H01M8/1016H01M8/1048H01M8/22
CPCY02E60/523Y02E60/50
Inventor 周震涛张高文
Owner SOUTH CHINA UNIV OF TECH
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