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Guanidyl functionalized graphene doped composite anion exchange membrane and preparation method thereof

A composite anion and exchange membrane technology, which is applied in electrochemical generators, fuel cells, electrical components, etc., can solve the problems of poor dimensional stability, poor alkali resistance and heat resistance, and low ion conductivity of anion exchange membranes. High dimensional stability, good alcohol resistance and good mechanical properties

Active Publication Date: 2020-12-15
QUANZHOU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problems of low ion conductivity, poor alkali resistance and heat resistance, and poor dimensional stability of the above-mentioned anion exchange membranes existing in the prior art, the present invention aims to provide a composite anion exchange membrane doped with guanidine functionalized graphene. Membrane and preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of a composite anion-exchange membrane doped with guanidinium-functionalized graphene, comprising the following steps:

[0028] (1) Preparation of guanidinium-functionalized graphite oxide (GGO): put a single-necked flask in an ice-water bath, add 75 mL of mixed acid (volume ratio of sulfuric acid and phosphoric acid is 9:1) into the flask, add 1 g of graphite powder, Stir while adding, after stirring and reacting for 30 minutes, slowly add 5 g of potassium permanganate, then raise the temperature to 50°C and react for 16 hours, cool to room temperature, add 80 mL of deionized water and 20 mL of H 2 o2 Further oxidize until the solid turns bright yellow, stir for 1 hour, wash with 5% HCl and deionized water until neutral, and freeze-dry to obtain a yellow product called graphene oxide (GO). Weigh 100 mg of GO and pour it into a 50 mL three-neck flask, add 15 mL of tetramethylguanidine, heat and react in an oil bath at 80 °C for 18 hours after sealin...

Embodiment 2

[0036] A preparation method of a composite anion-exchange membrane doped with guanidinium-functionalized graphene, comprising the following steps:

[0037] (1) Preparation of guanidinium-functionalized graphite oxide (GGO): The same method as in Example 1 was used to prepare graphene oxide (GO). Weigh 100 mg of GO and pour it into a 50 mL three-neck flask, add 30 mL of tetramethylguanidine, heat and react in an oil bath at 60 °C for 20 hours after sealing, cool to room temperature, rinse with absolute ethanol until neutral , freeze-dried to obtain guanidinium-functionalized graphene oxide (GGO).

[0038] (2) Preparation of tetramethylbenzylguanidine: get 3g of tetramethylguanidine and 0.3g of benzyl bromide in a 50mL round-bottom flask and stir and mix, stir the mixture at room temperature for 4 hours, then react in a water bath at 40°C for 20 hours, After the reaction, the turbid reaction solution was suction filtered, the filtrate was diluted with 50 mL of dichloromethane, ...

Embodiment 3

[0045] A preparation method of a composite anion-exchange membrane doped with guanidinium-functionalized graphene, comprising the following steps:

[0046] (1) Preparation of guanidinium-functionalized graphite oxide (GGO): The same method as in Example 1 was used to prepare graphene oxide (GO). Weigh 100 mg of GO and pour it into a 50 mL three-neck flask, add 20 mL of tetramethylguanidine, heat and react in an oil bath at 90 °C for 16 hours after sealing, cool to room temperature, rinse with absolute ethanol until neutral , freeze-dried to obtain guanidinium-functionalized graphene oxide (GGO).

[0047] (2) Preparation of tetramethylbenzylguanidine: get 3g of tetramethylguanidine and 3g of benzyl chloride in a 50mL round-bottomed flask and stir and mix, stir the mixture at room temperature for 4 hours, then react in a water bath at 40°C for 12 hours, and react After the end, the reaction turbid liquid was suction filtered, the filtrate was diluted with 50 mL of dichlorometha...

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Abstract

The invention discloses a guanidyl functionalized graphene doped composite anion exchange membrane and a preparation method thereof, and belongs to the technical field of membranes. The composite anion exchange membrane is an organic-inorganic composite membrane, an inorganic phase is guanidyl functionalized graphene, and an organic phase is a fluorine-containing acrylate polymer with a large number of guanidyl functional groups on a side chain. The composite anion exchange membrane prepared by the invention has high ionic conductivity, good chemical stability and thermal stability, and excellent dimensional stability and mechanical properties, and has good methanol resistance when being used for a direct methanol fuel cell.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to an organic-inorganic composite anion exchange membrane doped with guanidinium functionalized graphene and a preparation method thereof. Background technique [0002] Anion exchange membrane is a kind of alkaline electrolyte, because of its selective permeability to anions, it is also called anion permselective membrane. Anion-exchange membranes are widely used. It is one of the key materials in mixture separation, purification devices and electrochemical components. It plays an important role in the fields of chlor-alkali industry, water treatment industry, heavy metal recovery, hydrometallurgy and electrochemical industry. . In recent years, with the development of new chemical power sources, the application of anion-exchange membranes as battery separators in flow energy storage batteries, alkaline anion-exchange membrane fuel cells, and new supercapacitors has a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1011H01M8/1039H01M8/1072C08J5/22C08L33/16C08K9/04C08K3/04
CPCH01M8/1039H01M8/1072H01M8/1011C08J5/2237C08J2333/16C08K9/04C08K3/042Y02E60/50
Inventor 方军俞生生魏东伟
Owner QUANZHOU NORMAL UNIV
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