Preparation method and application of Nafion-macromolecule functionalized carbon nano tube hybrid membrane

A technology of carbon nanotubes and polymers, applied in the field of fuel cell proton exchange membranes, can solve the problems of water loss, low proton transfer efficiency, and low water retention capacity of Nafion polymers, and achieve the effect of simple synthesis

Inactive Publication Date: 2014-09-17
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the Nafion membrane with the best comprehensive performance operates under the operating conditions of high temperature and low humidity (the ideal operating environment of the battery). Due to the low water retention capacity of the Nafion polymer, the water loss is serious and the proton transfer efficiency is low.

Method used

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  • Preparation method and application of Nafion-macromolecule functionalized carbon nano tube hybrid membrane
  • Preparation method and application of Nafion-macromolecule functionalized carbon nano tube hybrid membrane
  • Preparation method and application of Nafion-macromolecule functionalized carbon nano tube hybrid membrane

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preparation example Construction

[0018] The method for preparing Nafion-polymer functionalized carbon nanotube hybrid film of the present invention comprises the following steps:

[0019] 1) Preparation of vinyl-modified carbon nanotubes: ultrasonically disperse a certain amount of hydroxylated carbon nanotubes in absolute ethanol to obtain solution A, wherein the mass ratio of hydroxylated carbon nanotubes to ethanol is 1:500-1 :20, add a certain amount of 3-(trimethoxysilyl)propyl-2-methyl-2-acrylate in solution A, wherein 3-(trimethoxysilyl)propyl-2-methyl The mass ratio of base-2-acrylate to hydroxylated carbon nanotubes is 1:4-2:1, stirred at 60°C for 24 hours; centrifugally washed and dried to obtain vinyl-modified carbon nanotubes;

[0020] 2) Preparation of polymer functionalized carbon nanotubes: Weigh a certain amount of vinyl-modified carbon nanotubes and disperse them in acetonitrile, wherein the mass ratio of vinyl-modified carbon nanotubes to acetonitrile is 1:4000-1:500, and ultrasonically 60m...

Embodiment 1

[0024] Embodiment 1, the preparation method of Nafion-poly(vinyl dimethyl phosphate-co-ethylene glycol dimethacrylate) functionalized carbon nanotube hybrid film, comprises the following steps:

[0025] 1) Preparation of vinyl-modified carbon nanotubes: ultrasonically disperse 0.5 g of hydroxylated carbon nanotubes in 50 mL of ethanol, add 0.5 mL of 3-(trimethoxysilyl)propyl-2-methyl-2-acrylate, Stir at 60°C for 24h. Vinyl-modified carbon nanotubes were obtained by centrifugal washing and drying.

[0026] 2) Preparation of poly(vinyl dimethyl phosphate-co-ethylene glycol dimethacrylate) functionalized carbon nanotubes: Weigh 0.04 g of vinyl-modified carbon nanotubes and disperse them in 80 mL of acetonitrile, sonicate for 60 min, add 0.5mL dimethyl vinyl phosphate, 0.5mL ethylene glycol dimethacrylate, 0.02g azobisisobutyronitrile, heated to boiling with a heating mantle, the reaction time was 80min, the solvent was evaporated to 40mL, centrifuged and washed at 40 ℃ for 24 hou...

Embodiment 2

[0032] Embodiment 2, the preparation method of Nafion-poly (methacrylic acid-co-ethylene glycol dimethacrylate) functionalized carbon nanotube hybrid film, is basically consistent with embodiment 1, and its difference is only in: step 2) In acetonitrile, add 0.3mL methacrylic acid functional monomer, 0.3mL ethylene glycol dimethacrylate crosslinking agent, and 0.012g azobisisobutyronitrile to obtain poly(methacrylic acid-co -ethylene glycol dimethacrylate) functionalized carbon nanotubes, a 25nm thick poly(methacrylic acid-co-ethylene glycol dimethacrylate) polymer layer on the carbon nanotube surface modification; in addition , the functionalized carbon nanotubes obtained in Example 2 do not require post-acidification treatment.

[0033] image 3 It is a partial FESEM photo of the section of the Nafion-poly(methacrylic acid-co-ethylene glycol dimethacrylate) functionalized carbon nanotube hybrid film (film 9 in Table 1) prepared in Example 2; Films 6, 7, 8, and 9 shown in T...

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Abstract

The invention relates to a preparation method of a Nafion-macromolecule functionalized carbon nano tube hybrid membrane. The functionalized carbon nano tube is prepared by taking a vinyl-modified carbon nano tube, functional monomers (methacrylic acid, dimethyl vinyl phosphonate or styrene), a cross-linking agent (ethylene glycol dimethacrylate or divinyl benzene), azodiisobutyronitrile and acetonitrile as materials. The functionalized carbon nano tube is dispersed in Nafion and nitrogen-nitrogen dimethylacetamide to obtain film casting liquor, and the Nafion-functionalized carbon nano tube hybrid membrane is prepared by adopting a flow casting method. The carbon nano tube fictionalization method disclosed by the invention is simple in preparation, and capable of polymerizing a macromolecule layer which is 10-35mm thick on the surface of the carbon nano tube. Compared with the pure Nafion membrane, the hybrid membrane prepared by the preparation method has excellent proton conductivity (improving by 510% under a low-humidity condition) and good mechanical performance (increasing tensile strength by 61.4% and improving elasticity modulus by 30.6%).

Description

technical field [0001] The invention relates to a preparation method and application of a perfluorosulfonic acid polymer Nafion-functionalized carbon nanotube hybrid membrane, and belongs to the technical field of fuel cell proton exchange membranes. Background technique [0002] Proton exchange membrane fuel cell is considered to be the preferred clean energy in the 21st century because of its greenness, high energy density and no noise. Proton exchange membrane is one of the core components of fuel cells. The efficiency of proton transport in the membrane determines the battery performance. At present, the Nafion membrane with the best comprehensive performance operates under the operating conditions of high temperature and low humidity (the ideal operating environment of the battery). Due to the low water retention capacity of Nafion polymer, the water loss is serious, and the proton transfer efficiency is low. Carbon nanotubes functionalized with hydrophilic polymers c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/12C08L51/10C08J5/22C08F292/00C08F220/06C08F230/02C08F212/08H01M8/02H01M2/16H01M8/1046H01M8/1048H01M8/1067H01M8/1069
CPCY02E60/50
Inventor 姜忠义何光伟赵静李宗雨吴洪
Owner TIANJIN UNIV
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