Star-shaped cross-linked alkaline polyelectrolyte and preparation method thereof

A polyelectrolyte and alkaline technology, which is applied in the field of star-shaped cross-linked alkaline polyelectrolyte and its preparation, can solve the problems of unsatisfactory single cell performance, limit the swelling of target materials, increase the ion conductivity, etc., and achieve good chemical Stability, promotion of ionic conductivity, and effect of increasing ion content

Active Publication Date: 2022-07-15
WUHAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The introduction of the cross-linking agent greatly limits the swelling of the target material, and due to the formation of ion channels, the cross-linked anion exchange membrane has the advantage of increasing the ion conductivity. Unfortunately, the single cell assembled by the cross-linked membrane performance is not satisfactory
[0008] In summary, the main problems of the currently developed cross-linked alkaline polyelectrolytes are: the preparation process involves highly toxic reagents, or the ion conductivity is not high, or the battery performance is poor

Method used

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  • Star-shaped cross-linked alkaline polyelectrolyte and preparation method thereof
  • Star-shaped cross-linked alkaline polyelectrolyte and preparation method thereof
  • Star-shaped cross-linked alkaline polyelectrolyte and preparation method thereof

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Embodiment 1

[0047] A star-shaped cross-linked alkaline polyelectrolyte for a fuel cell and a preparation method thereof, comprising the following steps:

[0048] (1) Preparation of cationic precursor: 4 g of 2,3-epoxypropyltrimethylammonium chloride was dissolved in 40 mL of ethanol at 60°C. After the dissolution was complete, excess dimethylamine aqueous solution was added to continue the reaction for 6 h. After the end, the solvent was removed with a rotary evaporator, and it was placed in a vacuum drying oven at 40° C. to continue drying for 48 hours to obtain a yellow oily final product, which was a cation precursor.

[0049] (2) Preparation of brominated polyphenylene ether: Weigh 4g of polyphenylene ether in 50mL of chlorobenzene, stir and dissolve at 120°C, add 10g of brominating agent N-bromosuccinimide, dissolve, and heat up to At 135°C, 0.6 g of azobisisobutyronitrile was slowly added, and after reacting at 135°C for 4 hours, the product was precipitated in ice methanol, washed ...

Embodiment 2

[0053] A star-shaped cross-linked alkaline polyelectrolyte for fuel cells and a preparation method thereof:

[0054] It is basically the same as Example 1, except that the content of the cationic precursor in step (3) is 0.45 mmol, and the content of glutaraldehyde is 0.11 mmol.

[0055] The ion exchange capacity of the star-shaped cross-linked alkaline polyelectrolyte was measured to be 3.15 mmol g -1 , the gel degree was 92.1%, the room temperature swelling rate was 8.20%, the room temperature ionic conductivity was 32.5 mS / cm, and the mass loss rate and ionic conductivity loss rate after 30 days of alkali resistance stability were 17.3% and 28.6%, respectively.

Embodiment 3

[0078] A star-shaped cross-linked alkaline polyelectrolyte for fuel cells and a preparation method thereof:

[0079] It is basically the same as Example 1, the difference is: the content of the cation precursor in step (3) is 0.60 mmol, and the content of glutaraldehyde is 0.15 mmol. The ion exchange capacity of the membrane was measured to be 3.59 mmol g -1 , the gel degree was 92.0%, the room temperature swelling rate was 14.8%, the room temperature ionic conductivity was 51.6 mS / cm, and the mass loss rate and ionic conductivity loss rate after 30 days of alkali resistance stability were 14.8% and 24.2%, respectively.

[0080] The above results show that the preparation process of the star-shaped cross-linked alkaline polyelectrolyte for fuel cells disclosed in the embodiment of the present invention does not involve the use of the highly toxic substance chloromethyl ether, and can achieve the purpose of adjustable ion exchange capacity. as attached figure 1 As shown, the ...

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Abstract

The invention belongs to the field of alkaline membrane fuel cells, and particularly relates to a star-shaped cross-linked alkaline polyelectrolyte and a preparation method thereof. The preparation method comprises the following steps: preparing a cationic precursor, preparing brominated polyphenyl ether, and preparing the star-shaped cross-linked alkaline polyelectrolyte. The preparation process of the film does not involve the use of highly toxic reactants, and the film has the characteristics of good dimensional stability, high ionic conductivity and high chemical stability, and is suitable for being used in alkaline polyelectrolyte fuel cells.

Description

technical field [0001] The invention belongs to the field of alkaline membrane fuel cells, and more particularly relates to a star-shaped cross-linked alkaline polyelectrolyte and a preparation method thereof. Background technique [0002] A fuel cell is a type of device that can directly convert chemical energy into electrical energy, which is clean and efficient. Compared with proton exchange membrane fuel cells, alkaline polyelectrolyte fuel cells not only retain the advantages of high power density, compact structure, room temperature start-up, etc., but also have faster cathode reaction kinetics, higher carbon dioxide tolerance and can be used. The advantages of using non-precious metal catalysts have attracted widespread attention from researchers around the world. [0003] Alkaline polyelectrolytes, as materials that conduct ions and separate positive and negative electrodes, play a crucial role in fuel cells, requiring high ionic conductivity and high dimensional st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1069H01M8/1072H01M8/1086H01M8/1039C08G65/48C08J5/22C08L71/12
CPCH01M8/1069H01M8/1072H01M8/1086H01M8/1039C08G65/485C08J5/2287C08J2371/12Y02E60/50
Inventor 韩娟娟张杨洋康菲任占冬周晓荣
Owner WUHAN POLYTECHNIC UNIVERSITY
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