Meso-structural chitosan-phosphotungstic acid proton exchange membrane and preparation method thereof

A technology of proton exchange membrane and mesoporous structure, applied in structural parts, fuel cell parts, battery pack parts, etc. The effect of rate increase

Active Publication Date: 2014-11-26
北京海得利兹新技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the proton exchange membranes commonly used in direct methanol fuel cells are perfluorosulfonic acid membranes, such as Nafion. Although this membrane has high proton conductivity at room temperature, its low alcohol resistance and high manufacturing costs have seriously hindered the development of DMFC. development of

Method used

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preparation example Construction

[0017] The preparation method according to one embodiment of the present invention comprises:

[0018] 1. Prepare chitosan solution;

[0019] 2. Preparation of triblock copolymer P123 solution;

[0020] 3. Mix and stir chitosan solution and P123 solution, and cast to form a film;

[0021] 4. Carry out aftertreatment to the prepared film, remove the acetic acid and P123 in the film, obtain the mesoporous chitosan film;

[0022] 5. Immerse the membrane in step 4 in the phosphotungstic acid solution to obtain a mesoporous chitosan-phosphotungstic acid composite proton exchange membrane.

[0023] The specific method for preparing the chitosan solution in step 1: Weigh 10 grams (g) of chitosan powder and dissolve it in 400 milliliters (mL) of 1% glacial acetic acid solution, stir at room temperature for 2 hours (h), and wait until the solution is completely dissolved Finally, the light yellow chitosan solution is passed through a suction filtration device to remove insoluble imp...

Embodiment 1

[0041] 1. Weigh 10g of chitosan powder and dissolve it in 400mL of 1% glacial acetic acid solution, stir at room temperature for 2 hours, and after the dissolution is complete, remove the insoluble impurities from the light yellow chitosan solution through a suction filtration device to obtain 25mg / ml shell Polysaccharide solution, ready to use.

[0042] 2. Weigh 0.75g of triblock copolymer P123 solid and 100ml of ultrapure water, mix and stir for about 12 hours, after the dissolution is complete, add glacial acetic acid to the solution dropwise, adjust the pH of the solution to about 2, and obtain 7.5mg / ml of P123 solution, ready to use.

[0043] 3. Accurately measure 10ml of 7.5mg / ml P123 solution and 30ml of 25mg / ml chitosan solution and mix them until uniform. Cast on a pre-cleaned cast-film plate, place the cast-film plate in a 40°C oven for 24 hours, then adjust the oven temperature to 70°C for 2 hours, and finally adjust the oven temperature to 100°C for 1 hour, take it ...

Embodiment 2

[0048] 1. Weigh 10g of chitosan powder and dissolve it in 400mL of 1% glacial acetic acid solution, stir at room temperature for 2 hours, and after the dissolution is complete, remove the insoluble impurities from the light yellow chitosan solution through a suction filtration device to obtain 25mg / ml shell Polysaccharide solution, ready for use;

[0049] 2. Weigh 0.75g of triblock copolymer P123 solid and 100ml of ultrapure water, mix and stir for about 12 hours, after the dissolution is complete, add glacial acetic acid to the solution dropwise, adjust the pH of the solution to about 2, and obtain 7.5mg / ml of P123 solution, ready to use.

[0050] 3. Accurately measure 15ml of 7.5mg / ml P123 solution and 30ml of 25mg / ml chitosan solution and mix, stir until uniform. Cast on a pre-cleaned cast-film plate, place the cast-film plate in a 40°C oven for 24 hours, then adjust the oven temperature to 70°C for 2 hours, and finally adjust the oven temperature to 100°C for 1 hour, take...

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Abstract

The invention provides a meso-structural chitosan-phosphotungstic acid proton exchange membrane and a preparation method thereof. The preparation method comprises the following steps: step A, preparing an acetic acid solution of chitosan; step B, preparing a tri-block copolymer P123 solution; step C, mixing the chitosan solution and the P123 solution, stirring, and then casting to prepare membranes; step D, carrying out a post treatment on the prepared membranes to remove the acetic acid and P123 so as to obtain the mesoporous chitosan membranes; step E, dipping the membranes obtained in the step D into a phosphotungstic acid solution so as to obtain the meso-structural chitosan-phosphotungstic acid proton exchange membrane. The prepared proton exchange membrane has the advantages of high electrical conductivity and low methanol penetration coefficient, and is suitable for being directly applied to methanol fuel cells as a proton exchange membrane. At the same time, the preparation method has the advantages of wide raw material sources and low prices.

Description

technical field [0001] The invention relates to a preparation method of a proton exchange membrane with a mesoporous structure, which belongs to the proton exchange membrane technology. Background technique [0002] In addition to the common advantages of fuel cells, direct methanol fuel cells (DMFC) also have the characteristics of low-temperature rapid start-up, clean and environmentally friendly fuel, and simple battery structure, and have great commercial prospects. But from a technical point of view, there is still a long way to go before its commercialization. One of the main problems facing the development of DMFC is the high penetration of methanol in the proton exchange membrane. [0003] At present, the proton exchange membranes commonly used in direct methanol fuel cells are perfluorosulfonic acid membranes, such as Nafion. Although this membrane has high proton conductivity at room temperature, its low alcohol resistance and high manufacturing costs have seriousl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/22C08J9/26C08L5/08C08K3/32H01M8/02H01M2/16H01M8/103H01M8/1081
CPCY02E60/50
Inventor 相艳肖炎鑫卢善富
Owner 北京海得利兹新技术有限公司
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