Cross-linked polybenzimidazole basic anion exchange membrane, and preparation and application thereof

A polybenzimidazole, alkaline anion technology, applied in the field of alkaline anion exchange membrane fuel cells, can solve the problems of poor membrane dimensional stability, low conductivity of alkaline anion exchange membrane, etc., achieve environmental friendliness, improve mechanical strength and Dimensional stability, the effect of improving efficiency

Active Publication Date: 2019-02-26
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the low conductivity of alkaline anion exchange membranes in the prior art and the poor dimensional stability of the membrane, the purpose of the present invention is to provide an environmentally friendly, simple process for the preparation of cross-linked alkaline anion exchange membranes , so that it has better performance in alkaline anion exchange membrane fuel cells

Method used

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  • Cross-linked polybenzimidazole basic anion exchange membrane, and preparation and application thereof
  • Cross-linked polybenzimidazole basic anion exchange membrane, and preparation and application thereof
  • Cross-linked polybenzimidazole basic anion exchange membrane, and preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The synthesis process of 1-butyl-1,4-diazabicyclo[2.2.2]octane is as follows:

[0038] 1) Add 10g of 1,4-diazabicyclo[2.2.2]octane into 100mL ethyl acetate, stir and dissolve at room temperature, then add n-bromobutane, the number of moles added is 1,4-diazepine Heterobicyclo[2.2.2]octane 1.2 times, stirred overnight at room temperature;

[0039] 2) Filter the white suspension, wash it several times with ethyl acetate, and immediately dry it in a vacuum oven at 60°C to obtain a white powder of 1-butyl-1,4-diazabicyclo[2.2.2] octane.

[0040] The preparation method of 1-butyl-1,4-diazabicyclo[2.2.2]octane functionalized cross-linked polybenzimidazole basic anion exchange membrane comprises the following steps,

[0041] 1) Prepare a polybenzimidazole NMP solvent solution with a concentration of 1 wt%, and add polyvinylbenzyl chloride at room temperature, wherein the molar ratio of polybenzimidazole: polyvinylbenzyl chloride is 3:2 , stirred at room temperature for more...

Embodiment 2

[0057] The synthesis process of 1-butyl-1,4-diazabicyclo[2.2.2]octane is as follows:

[0058] 1) Add 15g of 1,4-diazabicyclo[2.2.2]octane into 150mL ethyl acetate, stir and dissolve at room temperature, then add n-bromobutane, the number of moles added is 1,4-diazepine Heterobicyclo[2.2.2]octane 1.3 times, stirred overnight at room temperature;

[0059] 2) Filter the white suspension, wash it several times with ethyl acetate, and immediately dry it in a vacuum oven at 60°C to obtain a white powder of 1-butyl-1,4-diazabicyclo[2.2.2] octane.

[0060] The preparation method of 1-butyl-1,4-diazabicyclo[2.2.2]octane functionalized cross-linked polybenzimidazole basic anion exchange membrane comprises the following steps,

[0061] 1) Prepare a NMP solvent solution of polybenzimidazole with a concentration of 2wt%, and add polyvinylbenzyl chloride at room temperature, wherein the molar ratio of polybenzimidazole: polyvinylbenzyl chloride is 1:1 , stirred at room temperature for mo...

Embodiment 3

[0068] The synthesis process of 1-hexyl-1,4-diazabicyclo[2.2.2]octane is as follows:

[0069] 1) Add 20g of 1,4-diazabicyclo[2.2.2]octane into 300mL of ethyl acetate, stir and dissolve at room temperature, then add n-bromohexane, the number of moles added is 1,4-diaza 1.5 times that of bicyclo[2.2.2]octane, stirred overnight at room temperature;

[0070] 2) Filter the white suspension, wash it several times with ethyl acetate, and immediately dry it in a vacuum oven at 60°C to obtain a white powder of 1-hexyl-1,4-diazabicyclo[2.2.2]octane alkyl.

[0071] 1-hexyl-1,4-diazabicyclo[2.2.2]octane functionalized cross-linked polybenzimidazole basic anion exchange membrane preparation method, comprising the following steps,

[0072] 1) Configure a DMAc solvent solution of polybenzimidazole with a concentration of 2 wt%, and add polyvinylbenzyl chloride at room temperature, wherein the molar ratio of polybenzimidazole: polyvinylbenzyl chloride is 3:2 , stirred at room temperature f...

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Abstract

The invention specifically relates to a cross-linked polybenzimidazole basic anion exchange membrane, and preparation and application thereof, belonging to basic anion exchange membrane fuel cells. The method comprises the following steps: synthesis of N1-long-chain alkane substituted-1,4-diazabicyclo[2.2.2]octane; and preparation of the N1-long-chain alkane substituted-1,4-diazabicyclo[2.2.2]octane functionalized polybenzimidazole-polyvinylbenzyl chloride cross-linked basic anion exchange membrane. According to the invention, the cross-linked anion exchange membrane is prepared by using a homogeneous method, and cross-linking and quaternization are completed in one step, so operation is simple and efficient, and the mechanical strength and dimensional stability of the cross-linked membrane are improved; a homogeneous reaction adopted in the process of preparation effectively improves the efficiency of quaternization, and a microscopic phase separation structure in the membrane allowsthe cross-linked membrane to have higher conductivity; and the cross-linked polybenzimidazole basic anion exchange membrane has the advantages of excellent dimensional stability, chemical stability and the like, and has potential application prospects in basic anion exchange membrane fuel cells.

Description

technical field [0001] The invention relates to an alkaline anion exchange membrane fuel cell, in particular to a preparation method of a cross-linked polybenzimidazole alkaline anion exchange membrane. Background technique [0002] Alkaline membrane fuel cell (AEMFC) has the advantages of fast oxygen reduction kinetics, the use of non-platinum catalysts, low material corrosion resistance requirements, and low cost. Still need to improve urgently. This is because the current anion exchange membranes are mainly composed of different polymer skeletons grafted with cationic groups, and the cationic groups are mainly quaternary ammonium groups. [0003] Studies have found that there is a certain degree of contradiction between the ion exchange capacity and mechanical strength of this type of anion exchange membrane. For example, when the ion exchange capacity is too large and the water content is too high, the membrane is easy to be brittle. The mechanical strength is guarante...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/103H01M8/1072C07D487/08
CPCH01M8/103H01M8/1072C07D487/08Y02E60/50
Inventor 邵志刚郝金凯姜永燚高学强衣宝廉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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