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Composite proton exchange membrane and preparation method thereof

A technology of proton exchange membrane and mesoporous silica, which is applied in the field of proton exchange membrane, can solve the problems of poor conductivity stability and reduced conductivity, and achieve the effect of improving conductivity, long pore depth and good water absorption

Active Publication Date: 2020-01-10
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In view of the above-mentioned defects in the prior art, the present invention provides a composite proton exchange membrane, which solves the problem of poor conductivity stability of the sulfonated polyether ether ketone matrix proton exchange membrane, and the problem that the conductivity decreases with the prolongation of use time

Method used

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  • Composite proton exchange membrane and preparation method thereof
  • Composite proton exchange membrane and preparation method thereof
  • Composite proton exchange membrane and preparation method thereof

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preparation example Construction

[0076] Preparation of Sulfonated Polyetheretherketone (SPEEK)

[0077] Sulfonated polyetheretherketone (SPEEK) was prepared by direct sulfonation method using the above commercially available polyetheretherketone (PEEK). The specific steps are as follows: the polyether ether ketone (PEEK) powder is placed in a drying oven and dried at 80° C. for 12 hours. Put 20 g of dry PEEK powder and 250 mL of concentrated sulfuric acid into a 500 mL three-neck flask, and stir at room temperature for 15 min until PEEK dissolves in concentrated sulfuric acid. Then the three-neck flask was transferred to a magnetically stirred water bath at 50° C., and stirred at a speed of 200-400 r / min for 4 h. After the reaction, the reaction liquid was dropped into the ice-water mixture to terminate the sulfonation reaction, and the stirring was continued at room temperature for 12 h. The reaction product SPEEK was washed with a large amount of deionized water until the filtrate was neutral, then dried ...

Embodiment 1

[0094] Sulfonated polyether ether ketone with 47% degree of sulfonation 0.7500g

[0095] Rod-shaped modified mesoporous silica particles 0.0040g

[0096] Phosphotungstic acid 0.0397g

[0097] Add 5 g of dimethyl sulfoxide solvent into a 20 ml sample bottle, and then add 0.75 g of sulfonated polyether ether ketone with a sulfonation degree of 47%. Transfer the sample vial to a magnetic stirring water bath, heat to 60°C, and maintain stirring to completely dissolve the sulfonated polyetheretherketone to obtain a sulfonated polyetheretherketone dimethyl sulfoxide solution with a concentration of 13 wt%.

[0098] Then, in another 20ml beaker, first add 2g of dimethyl sulfoxide, and then add 0.0040g of rod-shaped modified mesoporous silica particles modified by KH-550 amino group, ultrasonic treatment for 10min, the ultrasonic frequency is 40KHz , so that silicon dioxide is uniformly dispersed in dimethyl sulfoxide solvent to obtain a suspension. Then add 0.0397g of phosphotungs...

Embodiment 2

[0101] Sulfonated polyether ether ketone with 55% sulfonation degree 0.75g

[0102] Spherical modified mesoporous silica particles 0.0040g

[0103] Phosphotungstic acid 0.0397g

[0104] Add 5 g of dimethyl sulfoxide solvent into a 20 ml sample bottle, and then add 0.75 g of sulfonated polyether ether ketone with a sulfonation degree of 55%. Transfer the sample vial to a magnetic stirring water bath, heat to 60°C, and maintain stirring to completely dissolve the sulfonated polyetheretherketone to obtain a sulfonated polyetheretherketone dimethyl sulfoxide solution with a concentration of 13 wt%.

[0105] Then, in another 20ml sample bottle, first add 2g of dimethyl sulfoxide, then add 0.0040g of spherical modified mesoporous silica particles modified by KH-550 amino groups, and perform ultrasonic treatment for 10min at a frequency of 40KHz, the silicon dioxide is uniformly dispersed in the dimethyl sulfoxide solvent to obtain a suspension. Then add 0.0397g of phosphotungstic...

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Abstract

The invention provides a composite proton exchange membrane, which comprises sulfonated polyetheretherketone (SPEEK), modified mesoporous silica and phosphotungstic acid (HPW), wherein the HPW is loaded on the modified mesoporous silica. Based on the total mass of the composite proton exchange membrane, the content of the SPEEK is 92.5 wt%-95.5 wt%, the content of the modified mesoporous silica is0.5 wt%-1.5 wt%, and the content of the HPW is 4 wt%-6 wt%. The invention also provides a preparation method for the composite proton exchange membrane. The preparation method comprises the step of loading the HPW on the SPEEK through vacuum impregnation. The composite proton exchange membrane provided by the invention has good conductivity stability, and the preparation method is simple and easyfor industrial application.

Description

technical field [0001] The invention relates to proton exchange membrane technology, in particular to a composite proton exchange membrane and a preparation method thereof. Background technique [0002] Proton Exchange Membrane (Proton Exchange Membrane, abbreviated as PEM, also known as proton membrane or ion exchange membrane) is a kind of ion-selective separation function membrane, which is mainly used in fuel cells and chlor-alkali industry. The proton exchange membrane is a key component of the proton exchange fuel cell. Its role is to separate fuel and oxidant, conduct protons and insulate electrons. It can be said that the performance and life of the proton membrane directly determine the performance and life of the battery. [0003] At present, the most widely used proton exchange membrane for fuel cells is perfluorosulfonic acid membrane, and its representative product is DuPont's Membrane series products account for more than 95% of the market share. However, it...

Claims

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Application Information

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IPC IPC(8): H01M8/1048H01M8/1051H01M8/1025H01M8/1069H01M8/1088
CPCH01M8/1025H01M8/1048H01M8/1051H01M8/1069H01M8/1088H01M2008/1095Y02E60/50
Inventor 孟晓宇周琼丛川波董玉华朱厚坤
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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