Cross-linked polybenzimidazole basic anion exchange membrane and its preparation and application

A polybenzimidazole and alkaline anion technology, applied in the field of alkaline anion exchange membrane fuel cells, can solve the problems of poor membrane dimensional stability and low conductivity of alkaline anion exchange membranes, achieve stable oxidation resistance, improve mechanical Strength, dimensional stability, and efficiency-enhancing effects

Active Publication Date: 2022-06-24
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 its preparation and application
  • Cross-linked polybenzimidazole basic anion exchange membrane and its preparation and application
  • Cross-linked polybenzimidazole basic anion exchange membrane and its preparation and application

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 to 100 mL of ethyl acetate, stir and dissolve at room temperature, and then add n-butane bromide, and the number of moles added is 1,4-di 1.2 times of azabicyclo[2.2.2]octane, stirred at room temperature overnight;

[0039] 2) The white suspension was filtered, washed with ethyl acetate for several times, and immediately dried in a vacuum drying oven at 60 °C to obtain a white powder as 1-butyl-1,4-diazabicyclo[2.2.2] Octane.

[0040] A method for preparing a 1-butyl-1,4-diazabicyclo[2.2.2]octane-functionalized cross-linked polybenzimidazole basic anion exchange membrane, comprising the following steps,

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

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 150 mL of ethyl acetate, stir and dissolve at room temperature, and then add bromo-n-butane, and the number of moles added is 1,4-diol 1.3 times of azabicyclo[2.2.2]octane, stirred at room temperature overnight;

[0059] 2) The white suspension was filtered, washed with ethyl acetate for several times, and immediately dried in a vacuum drying oven at 60 °C to obtain a white powder as 1-butyl-1,4-diazabicyclo[2.2.2] Octane.

[0060] A method for preparing a 1-butyl-1,4-diazabicyclo[2.2.2]octane-functionalized cross-linked polybenzimidazole basic anion exchange membrane, comprising 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 , and stirr...

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 to 300 mL of ethyl acetate, stir and dissolve at room temperature, and then add bromo-n-hexane. The moles added is 1,4-diazo 1.5 times of heterobicyclo[2.2.2]octane, stirred at room temperature overnight;

[0070] 2) The white suspension was filtered, washed several times with ethyl acetate, and immediately dried in a vacuum drying oven at 60 °C to obtain a white powder as 1-hexyl-1,4-diazabicyclo[2.2.2]octane alkyl.

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

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

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Abstract

The invention relates to an alkaline anion-exchange membrane fuel cell, in particular to a cross-linked polybenzimidazole alkaline anion-exchange membrane and its preparation and application. The method includes the synthesis of N1-long-chain alkane-substituted-1,4-diazabicyclo[2.2.2]octane, N1-long-chain alkane-substituted-1,4-diazabicyclo[2.2.2] Preparation of Octane-functionalized Polybenzimidazole‑Polyvinylbenzyl Chloride Crosslinked Basic Anion Exchange Membranes. The invention adopts the homogeneous method to prepare the crosslinked anion exchange membrane, and the crosslinking and quaternization are completed in one step, which is simple and efficient, not only improves the mechanical strength and dimensional stability of the crosslinked membrane, but also effectively improves the homogeneous reaction used in the preparation process. The efficiency of quaternization is improved, and the microscopic phase separation structure in the membrane makes the crosslinked membrane have high conductivity, and has the advantages of excellent dimensional stability and chemical stability, etc., and has potential in alkaline anion exchange membrane fuel cells. application prospects.

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 cells (AEMFC) have the advantages of fast oxygen reduction kinetics, non-platinum catalysts can be used, material corrosion resistance requirements are small, and costs are low. aspects still need to be improved. This is because the current anion exchange membranes are mainly composed of different polymer backbones grafted with cationic groups, among which 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 easily brittle. The mechanical...

Claims

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Application Information

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Patent Type & Authority Patents(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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