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Proton exchanging composite film and preparation method thereof

A proton exchange membrane and proton exchange technology, which can be applied to the components of fuel cells, etc., can solve the problems of reducing the permeability of methanol and destroying the mechanical properties of the proton exchange membrane.

Inactive Publication Date: 2012-05-02
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of doping and modification can prevent the permeation of methanol. However, the composite membrane formed by doping and modifying the proton exchange membrane with the above-mentioned inorganic compounds reduces the methanol permeability while seriously destroying the mechanical properties of the proton exchange membrane.

Method used

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  • Proton exchanging composite film and preparation method thereof
  • Proton exchanging composite film and preparation method thereof
  • Proton exchanging composite film and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0026] The invention discloses a preparation method of a proton exchange composite membrane, comprising the following steps:

[0027] Mixing an amino group-containing organosilane with water to form a mixed solution;

[0028] adding an acid to the mixed solution to obtain a modified solution after reaction;

[0029] The proton exchange membrane is immersed in the modification solution, and the proton exchange composite membrane is obtained after reaction.

[0030] In the above preparation process, the present invention hydrolyzes the amino group-containing organosilane under acidic conditions, and uses the amino group-containing organosilane hydrolyzed under acidic conditions to modify the proton exchange membrane, so that the amino group-containing organic silane Silane and acid carry out sol-gel reaction on the surface of proton exchange membrane, and organosilane is modified on the surface of proton exchange membrane.

[0031] The structural formula of the organosilane co...

Embodiment 1

[0043] 1) Weigh 2.21 g of 3-aminopropyltriethoxysilane (APTES) and 18 g of water and stir at room temperature for 24 hours to form a mixed solution;

[0044] 2) Weighing 0.98g of concentrated sulfuric acid and gradually adding it into the mixed solution, keeping one drop per minute, stirring for 12 hours to form a modified solution;

[0045] 3) Take the Nafion117 membrane and heat it at 140° C. for 30 minutes, then immerse it in the modification solution for 5 seconds after cooling to obtain the modified proton exchange membrane, that is, the proton exchange composite membrane.

[0046] figure 1 Electron microscope pictures of the cross-section of the proton exchange composite membrane prepared for this example. In addition, the performance of the proton exchange composite membrane prepared in this example was measured, and the results showed that the proton conductivity of the proton exchange composite membrane prepared in this example was 0.09 Scm -1 , methanol permeabilit...

Embodiment 2

[0048] 1) Weigh 2.21 g of 3-aminopropyltriethoxysilane (APTES) and 18 g of water and stir at room temperature for 24 hours to form a mixed solution;

[0049] 2) Weigh 0.98g of concentrated sulfuric acid and gradually add it into the mixed solution, keeping it at one drop per minute, and stir for 12 hours to form a modified solution;

[0050] 3) Take the Nafion117 membrane and heat it at 140° C. for 30 minutes, then immerse it in the modification solution for 60 seconds after cooling to obtain the modified proton exchange membrane, that is, the proton exchange composite membrane.

[0051] figure 2 Electron microscope pictures of the cross-section of the proton exchange composite membrane prepared for this example. In addition, the performance of the proton exchange composite membrane prepared in this example was measured, and the results showed that the proton conductivity of the proton exchange composite membrane prepared in this example was 0.075 Scm -1 , methanol permeabi...

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Abstract

The invention discloses a preparation method of a proton exchanging composite film, comprising the following steps: mixing organosilane containing aminoalkyl and water to form mixed solution; adding acid into the mixed solution and reacting to obtain modification solution; and immersing a proton exchanging film into the modification solution to obtain the proton exchanging composite film. Compared with the prior art, the preparation method has the advantages that: the proton exchanging film is modified under an acidic condition by utilizing the hydrolyzed organosilane containing the aminoalkyl, the organosilane containing the aminoalkyl and acid are subjected to sol-gel reaction on the surface of the proton exchanging film, and the organosilane is modified on the surface of the proton exchanging film. The organosilane containing the amionalkyl has favorable mechanical property, therefore, the swelling property of the proton exchanging film and the methanol transmission property are inhibited, and meanwhile, the favorable mechanical property of the proton exchanging composite film is ensured. Test results prove that the proton exchanging composite film prepared by the invention hasfavorable proton transmission property, lower methanol transmittance and favorable mechanical property.

Description

technical field [0001] The invention relates to the technical field of fuel cells, and more specifically relates to a proton exchange composite membrane and a preparation method thereof. Background technique [0002] As the world's population and human activities grow, humans are often limited by the ability to supply electrical energy to support their various activities. A fuel cell is a device that directly converts chemical energy into electrical energy through an electrochemical reaction, that is, a fuel cell generates electricity electrochemically, using liquid or gaseous fuel, and generating electrical energy and a small amount of heat after reacting with oxygen. Moreover, the product discharged after the fuel cell generates electric energy is water, which meets the requirements of environmental protection, thereby solving the inherent pollution problem of the combustion process. Since Gove first proposed the concept of fuel cells in 1839, fuel cells have received mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/12H01M8/02
CPCY02E60/50
Inventor 张玉微廖建辉刘长鹏梁亮李晨阳邢巍
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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