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Method of preparing imorganic-organic copolymer proton exchange membrance

A technology of proton exchange membrane and production method, which is applied in the production field of proton exchange membrane, can solve the problems of high temperature and water content requirements, inability to increase electrode reaction speed, low mechanical properties, etc., and achieve improved strength and stability, excellent moisture absorption performance, the effect of strong hygroscopic performance

Inactive Publication Date: 2005-01-12
HUAZHONG UNIV OF SCI & TECH
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  • Description
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AI Technical Summary

Problems solved by technology

[0003] The proton exchange membranes used in PEMFC are generally perfluorosulfonic acid polymer Nafion series membranes, which have the following disadvantages: 1) Difficult to manufacture, long process and high cost; 2) High requirements on temperature and water content, the best work of Nafion series membranes The temperature is 70-90°C. Therefore, it is impossible to increase the electrode reaction rate and overcome catalyst poisoning by appropriately increasing the working temperature, and must work under humidified conditions; 3) The methanol direct permeability (crossover) is high, not suitable for use as methanol Proton Exchange Membranes for Fuel Cells
The disadvantage is: the mechanical properties are much lower than Nafion membrane
At present, the developed proton exchange membranes need to work above room temperature and under humidified conditions, especially the working conditions that require humidification complicate the design of fuel cells and reduce the overall specific energy density of fuel cells

Method used

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  • Method of preparing imorganic-organic copolymer proton exchange membrance
  • Method of preparing imorganic-organic copolymer proton exchange membrance

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) Weigh 40 grams of 30% silica sol solution, add 100 grams of 8% polyvinyl alcohol solution, stir evenly, and obtain a uniform solution;

[0030] (2) in above-mentioned solution, add 1 gram concentration and be the sulfuric acid solution of 20%, stir;

[0031] (3) casting the above solution on a glass plate to form a film, drying or drying at room temperature, volatilizing the water, and polymerizing the silica sol;

[0032] (4) Peel off the above film to obtain SiO 2 60% soft and transparent composite proton exchange membrane;

[0033] (5) soak the above film in 25°C 30% sulfuric acid solution for 4 hours, take out the acid solution that wipes the surface, and measure its conductivity as 1.12×10 -2 S / cm.

Embodiment 2

[0035] (1) Weigh 25 grams of 30% silica sol solution, add 0.5 gram of carboxymethyl cellulose, 25 grams of 8% polyvinyl alcohol solution, add 50 grams of water, stir evenly, and obtain a uniform solution;

[0036] (2) In the above solution, add 0.5 gram of tungstosilicic acid, 7 grams of sulfuric acid solution with a concentration of 60%, and stir evenly;

[0037] (3) casting the above solution on a glass plate to form a film, drying or drying at room temperature, volatilizing the water, and polymerizing the silica sol;

[0038] (4) Peel off the above film to obtain SiO 2 A composite proton exchange membrane with a content of 75% softness, whose conductivity was measured to be 4.76×10 -2 S / cm.

Embodiment 3

[0040] (1) Weigh 20 grams of 30% silica sol solution, add 6 grams of polyethylene glycol powder, stir evenly, add 50 grams of water, stir for 2 hours, and heat to 75°C at the same time to completely dissolve the polyethylene glycol to obtain a uniform solution ;

[0041] (2) in above-mentioned solution, add 5 gram concentration and be the sulfuric acid solution of 60%, stir;

[0042] (3) casting the above solution on a glass plate to form a film, drying or drying at room temperature, volatilizing the water, and polymerizing the silica sol;

[0043] (4) Peel off the above film to obtain SiO 2 50% soft composite proton exchange membrane;

[0044](5) The above-mentioned film is soaked in 30% sulfuric acid solution at a concentration of 25°C for 3 hours, and the acid solution on the surface is taken out to measure its conductivity as 3.64×10 -2 S / cm.

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Abstract

Preparing method includes following steps: mixing and stirring solution of silica sol and solution or powder of organic polymer having two or more hydroxy groups so as to obtain even solution; in solution of silica sol, weight of silicon dioxide : weight of organic polymer = 8 : (2-32); adding acid into the said solution and stirring it evenly, quantity of acid added : (weight of silicon dioxide + weight of organic polymer in solution); casting the said solution, drying at room temperature or drying by baking polymerizes silica sol; peeling off membrane to obtain composite proton exchange membrane. Features are favorable chemical stability and moisture absorption, high conductivity, no need of humidification.

Description

technical field [0001] The invention relates to a manufacturing method of a proton exchange membrane. Background technique [0002] The main technical difficulties in proton exchange membrane and catalyst research of proton exchange membrane fuel cell (PEMFC) are: high-efficiency proton exchange membrane preparation technology; high-efficiency catalytic electrode preparation technology and technical solutions for electrode poisoning; water in the battery pack , heat balance technology. [0003] The proton exchange membranes used in PEMFC are generally perfluorosulfonic acid polymer Nafion series membranes, which have the following disadvantages: 1) Difficult to manufacture, long process and high cost; 2) High requirements on temperature and water content, the best work of Nafion series membranes The temperature is 70-90°C. Therefore, it is impossible to increase the electrode reaction rate and overcome catalyst poisoning by appropriately increasing the working temperature, ...

Claims

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Application Information

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IPC IPC(8): C08J5/22H01M2/14H01M4/88H01M4/94H01M8/1081
CPCY02E60/521Y02E60/50
Inventor 索进平崔崑钱晓良肖建中
Owner HUAZHONG UNIV OF SCI & TECH
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