Preparation method of modified carbon nanotubes for proton exchange membrane

A proton exchange membrane and modified carbon technology, which is applied in the direction of carbon nanotubes, nanocarbon, nanotechnology, etc., can solve the problems of insufficient uniformity of proton exchange membranes, lower membrane proton conductivity, lower membrane resistance to alcohol, etc., and reach methanol Improvement of permeability, reduction of methanol permeability, and improvement of proton conductivity

Inactive Publication Date: 2015-07-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the interface compatibility between inorganic nanoparticles and polymer matrix is ​​poor. In the preparation process of proton exchange membrane, it is difficult to uniformly disperse inorganic nanoparticles in polymer matrix. The obtained proton exchange membrane is not uniform enough, not only It will reduce the alcohol resistance of the membrane and also reduce the proton conductivity of the membrane

Method used

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  • Preparation method of modified carbon nanotubes for proton exchange membrane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) prepare the ethanol solution of dopamine hydrochloride, wherein the concentration of dopamine hydrochloride is 4.0mg / mL, continuously feed nitrogen, and slowly add dropwise ammonia water (NH 3 Content 28wt%), add 1,3-propyl sultone according to the ratio of 4.0mg / mL to ethanol, reflux reaction at 50°C for 18h, then filter to obtain white powder, wash with ethanol for 3 times and dry to obtain sulfonate acidified dopamine;

[0028] (2) Dissolve tris(hydroxymethyl)aminomethane hydrochloride in deionized water to a concentration of 1.5 mg / mL, adjust the pH to 8.0 to obtain a buffer, disperse carbon nanotubes in the buffer, and add sulfonated dopamine , wherein the ratio of carbon nanotubes to buffer is 20 mg / mL, the ratio of sulfonated dopamine to buffer is 10 mg / mL, after reacting at room temperature for 48 hours, centrifuge to remove the lower precipitate and dry to obtain modified carbon nanotubes.

[0029] Disperse the above-mentioned modified carbon nanotubes eve...

Embodiment 2

[0031] (1) prepare the ethanol solution of dopamine hydrochloride, wherein the concentration of dopamine hydrochloride is 6.0mg / mL, continuously feed nitrogen, slowly add dropwise the ammoniacal liquor (NH 3 Content 25wt%), add 1,3-propyl sultone according to the ratio of 5.0mg / mL to ethanol, reflux reaction at 40°C for 24h, then filter to obtain white powder, wash with ethanol for 5 times and dry to obtain sulfonate acidified dopamine;

[0032] (2) Dissolve tris(hydroxymethyl)aminomethane hydrochloride in deionized water to a concentration of 1.0 mg / mL, adjust the pH to 11.0 to obtain a buffer, disperse carbon nanotubes into the buffer, and add sulfonated dopamine , wherein the ratio of carbon nanotubes to buffer is 30 mg / mL, the ratio of sulfonated dopamine to buffer is 6 mg / mL, after reacting at room temperature for 36 hours, centrifuge to remove the lower precipitate and dry to obtain modified carbon nanotubes.

[0033] The film-forming process of the proton exchange memb...

Embodiment 3

[0035] (1) Prepare the ethanol solution of dopamine hydrochloride, wherein the concentration of dopamine hydrochloride is 8.0mg / mL, continuously feed argon gas, slowly add dropwise ammonia water (NH 3 content 25wt%), add 1,3-propyl sultone according to the ratio of ethanol to 6.0mg / mL, reflux reaction at 60°C for 18h, then filter to obtain white powder, wash with ethanol for 4 times and dry to obtain sulfonate acidified dopamine;

[0036] (2) Dissolve tris(hydroxymethyl)aminomethane hydrochloride in deionized water to a concentration of 2.0 mg / mL, adjust the pH to 9.0 to obtain a buffer solution, disperse carbon nanotubes in the buffer solution, and add sulfonated dopamine , wherein the ratio of carbon nanotubes to buffer is 10 mg / mL, the ratio of sulfonated dopamine to buffer is 2 mg / mL, after reacting at room temperature for 24 hours, centrifuge to remove the lower precipitate and dry to obtain modified carbon nanotubes.

[0037] The film-forming process of the proton excha...

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Abstract

The invention discloses a preparation method of modified carbon nanotubes for a proton exchange membrane. The preparation method comprises the following steps: firstly, preparing the ethanol solution of dopamine hydrochloride, introducing a protective gas, dropwise adding ammonia water, adding 1,3-propyl sultone for reflux reaction, and then orderly performing filtering, ethanol cleaning and drying to obtain sulfated dopamine; dispersing carbon nanotubes in the buffer solution of tris(hydroxymethyl) aminomethane hydrochloride, adding the sulfated dopamine for reacting, and then centrifuging to obtain the precipitation of the lower layer, and drying to obtain the modified carbon nanotubes. According to the preparation method, the carbon nanotubes are covered with a layer of sulfated dopamine, so that the interface bonding force of the carbon nanotubes and the matrix of the proton exchange membrane can be increased, the proton electrical conductivity of the membrane is improved by use of a proton conduction channel formed by the sulfated carbon nanotubes, and meanwhile, the methane permeability of the membrane is improved by virtue of excellent dispersion of nanoparticles in the matrix.

Description

technical field [0001] The invention belongs to the technical field of carbon nanotube preparation, and in particular relates to a preparation method of a modified carbon nanotube used in a proton exchange membrane. Background technique [0002] As one of the core components of proton exchange membrane fuel cells, proton exchange membranes have gained more and more attention, and their performance directly affects the performance and service life of methanol fuel cells. A good proton exchange membrane must have the following important properties, such as low methanol permeability, good proton conductivity, stable mechanical and chemical properties, good thermal properties, etc. to ensure sufficient service life of the fuel cell. [0003] After the proton exchange membrane polymer matrix is ​​doped with inorganic nanoparticles, the mechanical stability and alcohol-repelling properties can be improved to a certain extent. However, the interface compatibility between inorganic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/94B82Y40/00
CPCB82Y40/00C01B32/16C01B32/166H01M4/94Y02E60/50
Inventor 林俊史珍珍何少剑李春雷胡冶刘鑫郏慧娜林彦楷
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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