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Medium temperature proton conductive mateiral basedon hydrophilic carbon nano tube and its preparing method

A technology of carbon nanotubes and proton conduction, applied in the fields of polymer materials and electrochemistry

Inactive Publication Date: 2007-04-11
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Medium temperature proton conductive mateiral basedon hydrophilic carbon nano tube and its preparing method
  • Medium temperature proton conductive mateiral basedon hydrophilic carbon nano tube and its preparing method

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Preparation of aqueous dispersion of carbon nanotubes oxidized by mixed acid: ultrasonically treat carbon nanotubes in concentrated sulfuric acid / concentrated nitric acid with a volume ratio of 3:1 for 30 minutes, reflux and condense at 100°C for 4 hours, and vacuum the carbon nanotubes with a cellulose membrane with a pore size of 0.22 μm. Suction filter, wash with deionized water until neutral, scrape it into a small bottle with a horn spoon, add water to make an aqueous dispersion. Take a clean glass plate and weigh W 1 , drop 1ml of carbon nanotube aqueous dispersion on it, dry, weigh W 2 , (W 2 -W 1 ) / 1 to obtain the concentration (g / ml) of the carbon nanotube aqueous dispersion.

[0025] Preparation of Nafion 112 solution: Dissolve Nafion 112 resin in N,N-dimethylformamide, dissolve for 1 hour at 180°C under nitrogen protection, and make it fully dissolved to make a 5% solution.

[0026] Preparation of composite membrane:

[0027] The ratio of raw materials u...

Embodiment 2

[0034] Preparation of aqueous dispersion of mixed acid oxidized carbon nanotubes: ultrasonically treat carbon nanotubes in concentrated sulfuric acid / concentrated nitric acid with a volume ratio of 3.2:1 for 35 minutes, reflux and condense at 110°C for 6 hours, and vacuum the carbon nanotubes with a cellulose membrane with a pore size of 0.22 μm. Suction filter, wash with deionized water until neutral, scrape it into a small bottle with a horn spoon, add water to make an aqueous dispersion. Take a clean glass plate and weigh W 1 , drop 1ml of carbon nanotube aqueous dispersion on it, dry, weigh W 2 , (W 2 -W 1 ) / 1 to obtain the concentration (g / ml) of the carbon nanotube aqueous dispersion.

[0035] Preparation of sPBI solution: sPBI was dissolved in a certain amount of 1-methyl-2-pyrrolidone, and dissolved at 60° C. for 2 hours to fully dissolve.

[0036] Preparation of composite membrane:

[0037] The ratio of raw materials used is as follows:

[0038] Mixed acid oxidi...

Embodiment 3

[0043] Preparation of surface carboxylated carbon nanotube aqueous dispersion: ultrasonically treat carbon nanotubes in concentrated sulfuric acid / concentrated nitric acid with a volume ratio of 3:1 for 30 minutes, reflux condensation at 100°C for 4 hours, and use cellulose with a pore size of 0.22 μm Membrane vacuum filtration, washed with deionized water until neutral, scraped into a small bottle with a horn spoon, added water to make a water dispersion.

[0044] Take a clean glass plate and weigh W 1 , drop 1ml of carbon nanotube aqueous dispersion on it, dry, weigh W 2 , (W 2 -W 1 ) / 1 to obtain the concentration (g / ml) of the carbon nanotube aqueous dispersion.

[0045] Take 30 mg of carbon nanotubes that have been oxidized by the above mixed acid, disperse them in 50 ml of DMF (N, N-dimethylformamide), treat them ultrasonically for 30 min., add 2 g of azobisisobutyronitrile, and blow nitrogen at room temperature to remove oxygen for 25 min. Minutes, 70 ° C magnetic st...

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Abstract

The present invention belongs to the field of functional polymer material and electrochemical technology, and is especially one kind of medium temperature protonic conducting material based on hydrophilic carbon nanotube and sulfonic group-containing polymer and its preparation process. The present invention features that sulfonic group-containing polymer and hydrophilic carbon nanotube are combined to obtain protonic conducting film material with water keeping capacity raised both chemically and structurally. The prepared protonic conducting film material has high protonic conducting performance even in the temperature over the boiling point of water, and may be used in proton exchanging film and film electrode in medium temperature fuel cell.

Description

technical field [0001] The invention belongs to the technical field of polymer materials and electrochemistry, and specifically relates to a composite proton conductive material based on sulfonated polymer and hydrophilic carbon nanotubes and a preparation method thereof, which can be used in a medium temperature environment above 100°C. Background technique [0002] Compared with the commonly used normal temperature PEMFC, the medium temperature (100-200℃) polymer electrolyte membrane fuel cell (PEMFC) has the following advantages: (1) the activity of the electrocatalyst and the allowable concentration of impurities such as CO are high; (2) it is possible Greatly reduce the amount of Pt and other noble metal electrocatalysts; (3) The kinetic characteristics of the electrode are improved, the fuel utilization rate and the energy density of the battery are high; (4) The humidification system of the battery is omitted; (5) The cooling system of the battery is simplified. Howev...

Claims

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Application Information

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IPC IPC(8): C08L79/04C08L79/08C08K3/04H01B1/24
Inventor 浦鸿汀谢娟廖欣
Owner TONGJI UNIV
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