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Carbon nanotube composite material as well as preparation method and application thereof

A carbon nanotube and composite material technology, applied in chemical instruments and methods, electrical components, circuits, etc., can solve the problems of decreased catalyst stability, decreased active area, loss of catalytic activity, etc., and achieves easy operation, high-efficiency catalytic activity, Ease of mass production

Active Publication Date: 2015-01-21
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method effectively improves the activity and stability of the catalyst, but because the catalyst is directly exposed to high temperature for processing, it will cause the agglomeration of some noble metal catalysts and cause a decrease in the active area. In addition, the preparation method needs to add iron salts and cobalt Salt is used as an auxiliary catalyst, and the iron and cobalt remaining in the catalyst will lead to corrosion of the modification layer, which will reduce the stability of the catalyst and eventually lose its catalytic activity

Method used

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  • Carbon nanotube composite material as well as preparation method and application thereof
  • Carbon nanotube composite material as well as preparation method and application thereof
  • Carbon nanotube composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Weigh carbon nanotubes and aniline according to the mass ratio of carbon nanotubes: aniline of 1:0.8, and weigh dichlorotetraammine according to the molar ratio of aniline:dichlorotetraammine platinum:ammonium persulfate as 1:0.5:1.2 Platinum and ammonium persulfate, wherein the carbon nanotubes have a diameter of 20-60 nanometers and a length of 5-15 microns. First add carbon nanotubes and aniline to the hydrochloric acid solution with a pH value of 1, and ultrasonically and stir for 1 hour, then add dichlorotetraammine platinum to form a mixed solution, and stir at 5°C for 10 hours, then dissolve in pH The ammonium persulfate in the hydrochloric acid solution with a value of 1 is slowly added dropwise to the mixed solution, and the dropping time is controlled at 30 minutes. After the dropping is completed, continue to stir and react at 5°C for 20 hours; then evaporate the solution to dryness to obtain a solid The product is ground, washed and dried to obtain carbon na...

Embodiment 2

[0076] According to the same method as in Example 1, the temperature 900°C during the heat treatment is replaced by 1000°C, the thickness of the nitrogen-doped carbon layer of the obtained composite material is about 0.5 to 0.8 nanometers, and the particle size of the noble metal nanoparticles is between 3 and 3 nanometers. 11 nanometers, the atomic percentage of nitrogen atoms in the surface of the nitrogen-doped carbon layer is 2.93%.

Embodiment 3

[0078] According to the same method as in Example 1, carbon nanotubes and aniline were fed according to a mass ratio of 1:1, and the thickness of the nitrogen-doped carbon layer of the obtained composite material was about 0.6-1.1 nanometers.

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Abstract

The invention relates to a preparation method and application of a composite material of a carbon nanotube coated by a carbon layer embedded with precious metal nano particles. The carbon nanotube composite material is simple and economic in preparation process and easy to produce in large scale, and precious metal nano particles with different grain diameters and the carbon layers with different coating thicknesses can be obtained by changing preparation conditions. The composite material prepared by the invention can be used as a cathodic oxygen reduction catalyst of a fuel cell, and the catalytic stability of the composite material is obviously superior to that of a simple material and a currently used commercialized carbon supported platinum catalyst.

Description

technical field [0001] The invention relates to a carbon nanotube composite material and its preparation method and application, in particular to a carbon layer-coated carbon nanotube composite material embedded with noble metal nanoparticles and its preparation method and application. Background technique [0002] As a power supply device with many advantages such as zero pollution, low noise, continuous energy supply, and high energy conversion rate, fuel cells have great potential for environmental protection and solving energy problems. However, the high cost and short service life of fuel cells have become important factors hindering their commercialization. As the most effective catalysts of various precious metals (such as platinum and palladium), the extensive use of catalysts has become one of the main factors for the high cost of fuel cells. In order to reduce the cost of fuel cells, noble metals are prepared as nanoparticles and dispersed on carbon supports, ther...

Claims

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Application Information

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IPC IPC(8): B01J27/24H01M4/90H01M4/92
CPCY02E60/50
Inventor 胡劲松郭琳万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
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