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Cross-linked anion exchange membrane as well as preparation method and application thereof

An anion-exchange membrane, cross-linked technology, applied in the field of cross-linked anion-exchange membrane and its preparation, can solve problems such as the need to improve the alkali resistance and mechanical properties, complex preparation methods, and expensive raw materials

Active Publication Date: 2021-05-04
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the alkali resistance of the anion exchange membrane prepared by adopting dicene cobalt cations has been improved, the alkali resistance and mechanical properties still need to be improved, and the preparation method is relatively complicated, and the raw material is expensive

Method used

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  • Cross-linked anion exchange membrane as well as preparation method and application thereof
  • Cross-linked anion exchange membrane as well as preparation method and application thereof
  • Cross-linked anion exchange membrane as well as preparation method and application thereof

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preparation example Construction

[0042] The present invention provides the preparation method of cross-linked anion exchange membrane described in above-mentioned technical solution, comprises the following steps:

[0043] (1) p-bromomethylbenzaldehyde, sodium azide and solvent 1 are mixed, and a substitution reaction is carried out to obtain p-azidobenzaldehyde;

[0044] (2) Mix the p-azidobenzaldehyde obtained in the step (1) with trimethylsilylethynyl cobaltocene hexafluorophosphate, catalyst 1 and solvent 2, then add anhydrous potassium carbonate to carry out copper (1) catalyzed azide-alkyne cycloaddition reaction, obtains dicyclocene cobalt cation base benzaldehyde;

[0045] (3) the cobaltocene-based benzaldehyde obtained in the step (2) is mixed with polyvinyl alcohol, catalyst 2 and solvent 3 to carry out an acetalization reaction to obtain cobaltocene-based polyvinyl alcohol;

[0046] (4) mixing the cobaltocene-based polyvinyl alcohol obtained in the step (3) with glutaraldehyde and solvent 4, and t...

Embodiment 1

[0092] The preparation method of anion exchange membrane is made up of the following steps:

[0093] (1) Add p-bromomethylbenzaldehyde and sodium azide to 15 mL of dimethylformamide and mix, carry out substitution reaction at room temperature for 24 hours, and carry out vacuum distillation to remove dimethyl Formamide, then add 10mL dichloromethane and 10mL deionized water to the distilled product, transfer to a separatory funnel after the solid is completely dissolved, extract and separate liquid three times to obtain an organic phase, combine the organic phases and then back-extract once to obtain Extracted product, and finally add anhydrous Na to the extracted product 2 SO 4 , followed by filtration and rotary steaming to obtain p-azidobenzaldehyde; said p-bromomethylbenzaldehyde, sodium azide and anhydrous Na 2 SO 4 The mass ratio is 1:2:1;

[0094] (2) Dissolve the p-azidobenzaldehyde and trimethylsilylethynyl cobaltocene hexafluorophosphate obtained in the step (1) i...

Embodiment 2

[0100] The preparation method of anion exchange membrane is made up of the following steps:

[0101] (1) Add p-bromomethylbenzaldehyde and sodium azide to 10 mL of dimethylformamide and mix, carry out substitution reaction at room temperature for 12 hours, and carry out vacuum distillation to remove dimethyl Formamide, then add 10mL dichloromethane and 10mL deionized water to the distilled product, transfer to a separatory funnel after the solid is completely dissolved, extract and separate liquid three times to obtain an organic phase, combine the organic phases and then back-extract once to obtain Extracted product, and finally add anhydrous Na to the extracted product 2 SO 4 , followed by filtration and rotary steaming to obtain p-azidobenzaldehyde; said p-bromomethylbenzaldehyde, sodium azide and anhydrous Na 2 SO 4 The mass ratio is 1:1:1;

[0102] (2) Dissolve the p-azidobenzaldehyde and trimethylsilylethynyl cobaltocene hexafluorophosphate obtained in the step (1) i...

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Abstract

The invention provides a cross-linked anion exchange membrane as well as a preparation method and application thereof, and belongs to the technical field of fuel cells. According to the cross-linked anion exchange membrane provided by the invention, polyvinyl alcohol is used as a membrane matrix, and cobaltocene cations are introduced and are cross-linked with glutaraldehyde, so that the alkali-resistant stability of the exchange membrane is improved, and the ionic conductivity is further kept at a relatively high level. The preparation method is convenient and efficient, and has a good application prospect in alkaline anion exchange membrane fuel cells. The result of an embodiment shows that the cross-linked anion exchange membrane provided by the invention is good in mechanical property, the highest tensile strength can reach 24.5 MPa, and the highest elongation at break is 15%; the conductivity at 80 DEG C can reach 72 mS / cm, and the water absorption swelling ratio does not exceed 20%; and the conductivity can still be kept at 85% or above of the initial value after the material is soaked in a 1M NaOH aqueous solution at 80 DEG C for 1000 hours.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a cross-linked anion exchange membrane and its preparation method and application. Background technique [0002] Due to the shortage of fossil fuels and growing environmental concerns, renewable energy sources are gaining more and more attention. As a new type of power generation device, fuel cell has the characteristics of low pollution, low noise and high efficiency, and has great application potential in the field of portable equipment and automobile power. [0003] Proton exchange membrane fuel cell (PEMFC) is currently the most in-depth study of a fuel cell. However, as the core component of PEMFC, proton exchange membrane (PEM) still has problems such as insufficient durability, high cost, and easy fuel leakage. This has greatly hindered the commercialization of PEMFCs. In recent years, researchers have turned their attention to anion exchange membrane fuel cells (AEMF...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/102H01M8/1072
CPCH01M8/102H01M8/1072Y02E60/50
Inventor 闫毅杨薇弘张秋禹胡颖晖刘爽
Owner NORTHWESTERN POLYTECHNICAL UNIV
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