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Long side chain type polyarene isatin alkaline membrane for fuel cell and preparation method of long side chain type polyarene isatin alkaline membrane

A fuel cell and polyaromatic technology, applied in fuel cells, circuits, electrical components, etc., can solve the problems of limited alkali resistance and ion conductivity, poor alkali resistance, poor mechanical properties, etc.

Inactive Publication Date: 2021-06-04
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The core component of anion exchange membrane fuel cell is anion exchange membrane (anion exchange membrane (AEM)), also called alkaline membrane, its main function is to conduct hydroxide ions and isolate anode and cathode fuels. Therefore, the high-performance alkaline membrane Preparation has become the main challenge for the development of this fuel cell. However, the existing alkaline membranes have the following problems: (1) low ion conductivity; (2) poor alkali resistance; (3) poor mechanical properties
[0006] In recent years, scientists have prepared polybiphenylpiperidine-based alkaline membranes with strong alkali resistance. However, the cationic groups of polybiphenylpiperidine-based alkaline membranes are still directly connected to its polymer backbone, which limits Its alkali resistance and ionic conductivity

Method used

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  • Long side chain type polyarene isatin alkaline membrane for fuel cell and preparation method of long side chain type polyarene isatin alkaline membrane
  • Long side chain type polyarene isatin alkaline membrane for fuel cell and preparation method of long side chain type polyarene isatin alkaline membrane
  • Long side chain type polyarene isatin alkaline membrane for fuel cell and preparation method of long side chain type polyarene isatin alkaline membrane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1: the synthesis of poly-terphenyl-bromohexyl isatin basic film

[0048] (1) Synthesis of 1-(6-bromohexyl)-indoline-2,3-dione

[0049] Dissolve 5 g of isatin in 200 mL of N,N-dimethylformamide (DMF), and add the solution to 100 mL of DMF suspension containing 1.23 g of NaH at 0°C, stir for 20 minutes, and add 5.5 mL of 1,6-dibromohexane, the reaction mixture was heated at 60°C for 4 hours, after the reaction was completed, 50 mL of deionized water was added to quench the reaction, the mixture was extracted three times with ethyl acetate, and the organic layer was washed with anhydrous sulfuric acid Sodium was dried for 8 hours, and after the organic solvent was evaporated by rotary evaporation, a brown-red product was obtained. The product was further purified by column chromatography using n-hexane:ethyl acetate (10:3), and the organic solution was rotary evaporated to obtain the product 1-(6 -Bromohexyl)-indoline-2,3-dione (bromohexyl isatin);

[0050] (2...

Embodiment 2

[0058] Embodiment 2: the preparation of polybiphenyl-bromhexyl isatin basic film

[0059] (1) Synthesis of 1-(6-bromohexyl)-indoline-2,3-dione

[0060] With embodiment 1.

[0061] (2) Synthesis of polybiphenyl-bromohexyl isatin main chain

[0062] 1-(6-bromohexyl)-indoline-2,3-diketone (bromohexyl isatin) prepared by 2g biphenyl and 3.48g of step (1) were dissolved in 10mL of dichloromethane, in Add 9.6mL of trifluoroacetic acid and 11.5mL of trifluoromethanesulfonic acid in an ice bath, and stir and react at room temperature for 4 hours. After the reaction, a viscous dark green solution is obtained, which is poured into methanol to obtain a white fibrous product , the product was filtered, washed three to five times with deionized water until neutral, to obtain polybiphenyl-bromohexyl isatin polyelectrolyte, which was dried for use;

[0063] (3) Synthesis of quaternized polybiphenyl-bromohexyl isatin

[0064] 2 g of quaternized polybiphenyl-bromohexyl isatin prepared in s...

Embodiment 3

[0069] Embodiment 3: the synthesis of poly-terphenyl-bromopropyl isatin basic film

[0070] (1) Synthesis of 1-(3-bromopropyl)-indoline-2,3-dione

[0071] Dissolve 5g of isatin in 200mL of N,N-dimethylformamide (DMF), and add the solution to 100mL of DMF suspension containing 1.23gNaH at 0°C, stir for 20 minutes, add 3.47mL of 1,3-dibromopropane, the mixture was stirred and reacted at 60°C for 4 hours. After the reaction was completed, 50 mL of deionized water was added to quench the reaction. After the mixture was extracted three times with ethyl acetate, the organic layer was washed with anhydrous sodium sulfate Dry for 8 hours, rotary evaporate the organic solvent to obtain a brown-red product, further purify the product by column chromatography using n-hexane:ethyl acetate (10:3), and then rotate the organic solution to obtain 1-(3-bromo Propyl)-indoline-2,3-dione (bromopropyl isatin);

[0072] (2) Synthesis of poly-p-terphenyl-bromopropyl isatin

[0073] Weigh 2 g of p...

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Abstract

The invention relates to a long side chain type polyaromatic isatin alkaline membrane for a fuel cell and a preparation method, and belongs to the technical field of fuel cells. A brominated alkyl substituted isatin monomer and a biphenyl monomer are subjected to a polymerization reaction to serve as a polymer main chain, a quaternary ammonium group serves as a cation functional group, and finally film casting is conducted. The side chain length of the alkaline membrane can be controlled by replacing isatin with different side chains. The main chain does not contain ether bonds, and the structure of the long side chain enables cationic groups to be far away from the main chain, so that the membrane has strong alkali resistance. The structure of the hydrophobic long side chain can construct a microscopic phase separation structure in the membrane to form an efficient ion transmission channel, so that the membrane has high ion conductivity. Meanwhile, the alkaline membrane also has excellent mechanical properties, and has wide application prospects.

Description

technical field [0001] The invention relates to an alkaline membrane and a preparation method, in particular to a long-side-chain type polyaromatic isatin alkaline membrane for a fuel cell and a preparation method thereof, and belongs to the technical field of fuel cell alkaline membrane preparation. [0002] technical background [0003] In recent years, alkaline anion exchange membrane fuel cells (AAEMFCs) have received more and more attention, because alkaline membrane fuel cells can use non-precious metal catalysts in an alkaline environment, and the cathode Possessing faster redox reaction kinetics provides a possible way to realize cheap low-platinum or platinum-free fuel cell technology, which is expected to replace high-cost proton exchange membrane fuel cells (PEMFCs). [0004] The core component of anion exchange membrane fuel cell is anion exchange membrane (anion exchange membrane (AEM)), also called alkaline membrane, its main function is to conduct hydroxide ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G61/10H01M8/1027H01M8/103H01M8/1072H01M8/1081
CPCC08G61/10H01M8/1027H01M8/103H01M8/1072H01M8/1081C08G2261/124C08G2261/143C08G2261/312C08G2261/72C08G2261/516Y02E60/50
Inventor 朱红龙川
Owner BEIJING UNIV OF CHEM TECH
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