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A kind of high chemical stability multilayer composite proton exchange membrane and its preparation method and application

A proton exchange membrane and chemical stability technology, applied in the field of high chemical stability multi-layer composite proton exchange membrane and its preparation, can solve the problems of unsuitable proton exchange membrane fuel cell, lack of protection, etc., to ensure stability and performance consistency, the effect of enhancing stability and consistency

Active Publication Date: 2017-02-22
杭州中科氢能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing patent CN200710012720 provides a covalently cross-linked fluorine / hydrocarbon composite ion exchange membrane, but the structure of the double-layer membrane makes one side of the hydrocarbon membrane still exposed and cannot be completely protected, so it is not suitable for proton exchange membrane fuel cell

Method used

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  • A kind of high chemical stability multilayer composite proton exchange membrane and its preparation method and application
  • A kind of high chemical stability multilayer composite proton exchange membrane and its preparation method and application
  • A kind of high chemical stability multilayer composite proton exchange membrane and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] (1) Take 0.6g sulfonated polyether ether ketone (SPEEK obtained by sulfonation reaction of PEEK whose model is Vitrex 450PF, IEC=1.95mmol g -1 ) was dissolved in 4mL DMSO, added 0.04g CDI, reacted at 50°C for 2h, added 0.032g 4-aminostyrene (VA), reacted at room temperature for 8h, and prepared a modified SPEEK casting solution;

[0079] (2) Lay the above-mentioned modified SPEEK casting film on a glass plate, and bake at 60°C for 8 hours to obtain a base film with a thickness of 79 μm;

[0080] (3) Dissolve 0.5g Nafion resin in 4mL DMSO, add 0.02g CDI, react at 50°C for 2h, add 0.017g 4-aminostyrene, react at room temperature for 8h, and make a modified Nafion casting solution;

[0081] (4) Coating modified Nafion on both sides of the base film prepared in the above step (2) by means of dipping-lifting.

[0082](5) Spread the multilayer composite membrane on a glass plate, bake it at 60°C for 8 hours, and finally place it in a vacuum drying oven at 150°C for 3 hours t...

Embodiment 2

[0087] In the same way as in Example 1, the difference is that the non-fluorine sulfonic acid polymer used is sulfonated polyethersulfone (SPES obtained by the PES of SolvayVeradel-3000P through sulfonation reaction, IEC=2.64mmol g -1 ).

[0088] The multilayer composite proton exchange membrane prepared by the above method was subjected to an accelerated oxidation test at 80° C. in Fenton reagent, and the performance was similar to that of the multilayer composite proton exchange membrane obtained in Example 1.

[0089] The multilayer composite proton exchange membrane prepared by the above method is assembled into a direct methanol fuel cell, and the effective area of ​​the membrane electrode is 4cm -2 , the catalyst loading of positive and negative electrodes is 4 mg cm -2 , using a methanol solution with a concentration of 3M. The measured polarization curve and power density curve of the multilayer composite film are close to those of Example 1.

[0090] The multi-laye...

Embodiment 3

[0092] In the same way as in Example 1, the difference is that the non-fluorine sulfonic acid polymer used is sulfonated polysulfone (the SPSU obtained by the PSU of Solvay P3500 by sulfonation reaction, IEC=2.64mmol g -1 ).

[0093] The multilayer composite proton exchange membrane prepared by the above method was subjected to an accelerated oxidation test at 80° C. in Fenton reagent, and the performance was similar to that of the multilayer composite proton exchange membrane obtained in Example 1.

[0094] The multilayer composite proton exchange membrane prepared by the above method is assembled into a direct methanol fuel cell, and the effective area of ​​the membrane electrode is 4cm -2 , the catalyst loading of positive and negative electrodes is 4 mg cm -2 , using a methanol solution with a concentration of 3M. The measured polarization curve and power density curve of the multilayer composite film are close to those of Example 1.

[0095] The multi-layer composite p...

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Abstract

The invention relates to the field of functional polymer composite materials, and in particular relates to a multi-layer composite proton exchange membrane having high chemical stability as well as a preparation method and use thereof, wherein the multi-layer composite proton exchange membrane can be applied to a direct methanol fuel cell and an all-vanadium redox flow battery. The multi-layer composite proton exchange membrane having high chemical stability provided by the invention comprises three layers of sulfonic acid polymer membranes overlapped with one another; the outer membranes at two sides are all-fluorine sulfonic acid polymer layers; the basic membrane in the middle is a non-fluorine sulfonic acid polymer layer; and the outer membranes and the basic membrane are mutually connected through a covalent bond. Compared with the commercial all-fluorine sulfonic acid proton exchange membrane, the cost of the multi-layer composite proton exchange membrane provided by the invention is greatly reduced; compared with the common non-fluorine sulfonic acid proton exchange membrane, the stability is greatly increased; the preparation process is simple; the thicknesses of various membranes are adjustable and controllable; the repeatability is good; furthermore, the proton conductivity of the composite membrane is adjustable and controllable; the preparation process is moderate; and in addition, the multi-layer composite proton exchange membrane has the characteristics of firm structure and good chemical stability.

Description

technical field [0001] The invention relates to the field of functional polymer composite materials, in particular to a highly chemically stable multilayer composite proton exchange membrane applicable to direct methanol fuel cells and all-vanadium redox flow batteries, as well as its preparation method and application. Background technique [0002] As one of the key components of proton exchange membrane fuel cells and all-vanadium redox flow batteries, the function of proton exchange membrane is not only reflected in the physical separation of different electrolytes, but also plays the role of conducting ions due to its semi-permeability. The currently commercially available diaphragms are perfluorosulfonic acid proton exchange membranes, such as DuPont's Nafion series, which have the advantages of high ion conductivity and excellent chemical stability. However, the high price of Nafion membrane, low working temperature, high ion permeability and environmental pollution pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/1041H01M8/1011H01M8/18H01M8/1018H01M8/1069
CPCY02E60/50Y02P70/50
Inventor 钱汇东邢新峰李盼李雪梅杨辉
Owner 杭州中科氢能科技有限公司
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