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High conductivity cross-linked organic phosphate polybenzoimidazole high temperature proton exchange membrane and preparation method thereof

A proton exchange membrane and organic phosphoric acid technology, which is applied in solid electrolyte fuel cells, circuits, fuel cells, etc., to achieve the effects of improving dimensional stability, improving conductivity stability, and reducing phosphoric acid loss.

Active Publication Date: 2017-02-22
ZHANGJIAGANG IND TECH RES INST CO LTD DALIAN INST OF CHEM PHYSICS CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PBI membrane materials will inevitably degrade when they are operated at high temperatures (T≥150°C).

Method used

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  • High conductivity cross-linked organic phosphate polybenzoimidazole high temperature proton exchange membrane and preparation method thereof
  • High conductivity cross-linked organic phosphate polybenzoimidazole high temperature proton exchange membrane and preparation method thereof
  • High conductivity cross-linked organic phosphate polybenzoimidazole high temperature proton exchange membrane and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0028] A method for preparing a cross-linked organophosphate polybenzimidazole high-temperature proton exchange membrane with high conductivity, which is prepared by the following steps:

[0029] (1) Dissolve 0.5 g vinylphosphonic acid in 10 mL N-methylpyrrolidone, stir until dissolved, add vinylbenzyl chloride, stir at room temperature for 30 min, the mole of vinylphosphonic acid and vinylbenzyl chloride The ratio is 5:1;

[0030] (2) Add 0.1 g of azobisisobutyronitrile to the solution, transfer the solution to an oil bath at 60-150 °C, stir, and pass through nitrogen protection, the nitrogen flow rate is 100 mL / min, and react for 12 h;

[0031] (3) After the reaction, pour the solution into ethanol to precipitate, and wash with ethanol several times, deionized water several times, and then dry at 60°C;

[0032] (4) Weigh 0.2 g of the product, 0.1 g of polybenzimidazole, dissolve in 20 mL of N-methylpyrrolidone, and stir to dissolve at room temperature;

[0033] (5) Transfe...

Embodiment 2

[0038] A method for preparing a cross-linked organophosphate polybenzimidazole high-temperature proton exchange membrane with high conductivity, which is prepared by the following steps:

[0039](1) Dissolve 0.8 g vinylphosphonic acid in 20 mL N-methylpyrrolidone, stir until dissolved, add vinylbenzyl chloride, stir at room temperature for 30 min, the molar ratio of vinylphosphonic acid to vinylbenzyl chloride 2:1;

[0040] (2) Add 0.8 g of azobisisobutyronitrile to the solution, transfer the solution to an oil bath at 60-150 °C, stir, and protect with nitrogen gas flow rate of 100 mL / min; react for 24 h;

[0041] (3) After the reaction, pour the solution into ethanol to precipitate, and wash with ethanol several times, deionized water several times, and then dry at 60°C;

[0042] (4) Weigh 0.5 g of the product, 0.25 g of polybenzimidazole, dissolve in 23 mL of N-methylpyrrolidone, stir and dissolve at room temperature;

[0043] (5) Transfer the casting liquid to an 80°C oil...

Embodiment 3

[0048] A method for preparing a cross-linked organophosphate polybenzimidazole high-temperature proton exchange membrane with high conductivity, which is prepared by the following steps:

[0049] (1) Dissolve 1.5 g vinylphosphonic acid in 30 mL N,N-dimethylacetamide, stir until dissolved, then add vinylbenzyl chloride; stir at room temperature for 60 min, vinylphosphonic acid and vinylbenzyl The molar ratio of base chloride is 5:1;

[0050] (2) Add 1.5 g of azobisisobutyronitrile to the solution, transfer the solution to an oil bath at 60-150 °C, stir, and pass through nitrogen protection, the nitrogen flow rate is 100 mL / min, and react for 24 h;

[0051] (3) After the reaction, pour the solution into ethanol to precipitate, and wash with ethanol several times, deionized water several times, and then dry at 60°C;

[0052] (4) Weigh 0.5 g of the product, 0.5 g of polybenzimidazole, dissolve in 30 mL of N,N-dimethylacetamide, stir and dissolve at room temperature;

[0053] (5)...

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Abstract

The invention discloses a high conductivity cross-linked organic phosphate polybenzoimidazole high temperature proton exchange membrane and preparation method thereof. The polybenzoimidazole is adopted as the polymer substrate. Through polymerization reaction and the adoption of vinyl benzyl chloride as the cross-linking agent, the self-cross-linking of polybenzoimidazole and Vinyl phosphate is conducted to form the membrane, which can be adopted for the preparation of homogeneous phase high temperature proton exchange membrane. The membrane not only can enhance the adsorption site of phosphoric acid, thus enhancing the conductivity of the membrane, but also can hugely reduce the phosphoric acid loss of polybenzoimidazole / phosphoric acid film, effectively enhance the conductivity stability of the membrane. Under non-wetting condition the membrane has the advantages of excellent proton conductive capability, and low air permeability. The membrane can be adopted for the high temperature proton exchange membrane fuel cell, direct alcohol fuel cell, electrochemical sensor and other electrochemical devices.

Description

technical field [0001] The invention belongs to the technical field of fuel cell materials, and in particular relates to a cross-linked organic phosphate polybenzimidazole high-temperature proton exchange membrane with high conductivity and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a high-efficiency, clean and environment-friendly power generation device. It is an ideal power source for electric vehicles. application prospects. However, perfluorinated sulfonic acid membrane fuel cells represented by Nafion® are widely used at present, but the proton conductivity of this type of proton exchange membrane is greatly affected by the water content and temperature in the membrane, and the alcohol resistance performance is poor. The working temperature cannot exceed 80°C. Because PEMFC is limited by the operating temperature, it faces problems such as poor CO tolerance and difficult water and heat management of the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/10H01M8/1018H01M8/102H01M8/1069H01M8/1072
CPCH01M8/10H01M8/1018H01M8/102H01M8/1069H01M8/1072Y02E60/50
Inventor 于书淳张燕燕何春霞郭会娟李慧
Owner ZHANGJIAGANG IND TECH RES INST CO LTD DALIAN INST OF CHEM PHYSICS CHINESE ACADEMY OF SCI
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