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Composite proton exchange membrane and preparation method thereof

A technology of proton exchange membrane and dry membrane, which is applied in the field of fuel cells, can solve the problems of insufficient flexibility, mechanical properties and thermal stability, etc., and achieve the effects of good proton conductivity, improved proton conductivity, and improved dispersibility

Active Publication Date: 2017-11-24
HUBEI ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the direct use of chitosan to prepare proton exchange membranes, or the single group (-OH, -NH) carried by the chitosan matrix 2 ) The composite proton exchange membranes prepared after modification all have the problems of insufficient flexibility, mechanical properties and thermal stability of the membranes.

Method used

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  • Composite proton exchange membrane and preparation method thereof
  • Composite proton exchange membrane and preparation method thereof
  • Composite proton exchange membrane and preparation method thereof

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preparation example Construction

[0018] A preparation method of a composite proton exchange membrane, comprising:

[0019] According to the mass ratio of sulfurized zirconia-coated carbon nanotubes and chitosan being 0.1-10:100, the sulfurized zirconia-coated carbon nanotubes and chitosan were prepared respectively. Wherein, the prepared chitosan is made into an acidic solution of chitosan.

[0020] Sulfurized zirconia-coated carbon nanotubes can be prepared by the following methods:

[0021] Add every 1g of carbon nanotubes into every 50-100mL of acid solution and mix evenly, carry out oxidation treatment at 20-120°C for 1-8 hours and then cool, preferably cooling to 20-25°C for the convenience of follow-up deal with. Filtering, washing with water until neutral and drying at a temperature of 60-100° C. are carried out in sequence to obtain acid-oxidized carbon nanotubes. By using acid to oxidize carbon nanotubes, oxygen-containing functional groups are introduced into the surface of carbon nanotubes. Whil...

Embodiment 1

[0053] The composite proton exchange membrane was prepared according to the mass ratio of sulfurized zirconia-coated carbon nanotubes and chitosan at 0.1:100.

[0054] Take 1g of carbon nanotubes in 60mL of concentrated nitric acid, oxidize at 30°C for 7h, cool to 20°C, filter, wash with deionized water until neutral, and dry at 60°C to obtain acid oxidation carbon nanotubes. Mix acid-oxidized carbon nanotubes with 0.2 mol / L zirconium oxychloride aqueous solution, add ammonia water dropwise to adjust the pH value between 9 and 10, stir for 24 hours, filter, wash with deionized water until neutral, and Dry at a temperature of 80 °C to obtain the initial sample. The initial sample was added to 0.5mol / L sulfuric acid solution, stirred at 200rpm for 1h, filtered, washed with deionized water until neutral, dried at 80°C, and calcined at 620°C for 1h to obtain Sulfurized zirconia-coated carbon nanotubes.

[0055] Put 0.7g of chitosan with a molecular weight of 1 million into the ...

Embodiment 2

[0059] The composite proton exchange membrane was prepared according to the mass ratio of sulfurized zirconia-coated carbon nanotubes and chitosan at 0.5:100.

[0060] Take 1g of carbon nanotubes in 70mL of concentrated nitric acid and oxidize at 40°C for 6h, cool to 25°C, filter, wash with deionized water until neutral, and dry at 60°C to obtain acid oxidation carbon nanotubes. Mix acid-oxidized carbon nanotubes with 0.2 mol / L zirconium oxychloride aqueous solution, add ammonia water dropwise to adjust the pH value between 9 and 10, stir for 26 hours, filter, wash with deionized water until neutral, and Dry at a temperature of 85°C to obtain the initial sample. The initial sample was added to 0.5mol / L sulfuric acid solution, stirred at 200rpm for 1.5h, filtered, washed with deionized water until neutral, dried at 85°C, and calcined at 600°C for 1.5h , to obtain sulfurized zirconia-coated carbon nanotubes.

[0061] Put 0.7g of chitosan with a molecular weight of 1 million i...

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Abstract

The invention provides a composite proton exchange membrane and a preparation method thereof, and relates to the field of fuel cells. The preparation method of the composite proton exchange membrane comprises the steps of preparing carbon nanotubes coated with sulfurated zirconia into dispersion liquid, mixing the dispersion liquid with an acid solution of chitosan, and drying to obtain a dry film; carrying out alkaline cleaning on the dry film, and then washing until the dry film is neutral; obtaining the composite proton exchange membrane under the action of a cross-linking agent. The prepared composite proton exchange membrane has good water absorption, proton conductivity, mechanical properties and thermal stability, thus having a wide application prospect in polymer-based fuel cells.

Description

technical field [0001] The invention relates to the field of fuel cells, and in particular to a composite proton exchange membrane and a preparation method thereof. Background technique [0002] As a proton exchange membrane with research potential, chitosan has the characteristics of low price and environmental friendliness. At the same time, it also has the characteristics of its suitable environment and low permeability with methanol. [0003] However, the direct use of chitosan to prepare proton exchange membranes, or the single group (-OH, -NH) carried by the chitosan matrix 2 ) modified composite proton exchange membranes prepared, all have the problems of insufficient membrane flexibility, mechanical properties and thermal stability. [0004] In view of this, the present invention is proposed. Contents of the invention [0005] The purpose of the present invention is to provide a method for preparing a composite proton exchange membrane, which uses super strong so...

Claims

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Application Information

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IPC IPC(8): C08J5/22C08J3/24C08L5/08C08K9/02C08K7/24H01M8/1069H01M8/1072H01M8/1041H01M8/1067
CPCC08J3/24C08J5/2212C08J2305/08C08K7/24C08K9/02C08L2201/08C08L2203/16H01M8/1041H01M8/1067H01M8/1069H01M8/1072C08L5/08Y02E60/50Y02P70/50
Inventor 汪杰欧颖刘海文胜龚春丽汪广进郑根稳覃彩芹
Owner HUBEI ENG UNIV
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