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Carbon nanotube, and preparation method and application thereof

A technology of carbon nanotubes and carbonates, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problem of low heteroatom doping amount and specific surface area, low catalytic activity of carbon nanotubes, and carbon doping The problem of low yield of nanotubes is to achieve the effect of simple process, suitable for continuous large-scale mass production, and enhanced electrocatalytic activity

Inactive Publication Date: 2015-02-25
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a carbon nanotube, its preparation method and application. The specific surface area of ​​nanotubes and the amount of heteroatom doping are increased to solve the problem of low catalytic activity of carbon nanotubes, resulting in low yield of doped carbon nanotubes, low heteroatom doping amount and specific surface area, high production cost and poor process complex technical issues

Method used

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  • Carbon nanotube, and preparation method and application thereof
  • Carbon nanotube, and preparation method and application thereof
  • Carbon nanotube, and preparation method and application thereof

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[0029] Carbon nanotube provided by the invention, its preparation method, comprises the following steps:

[0030] (1) Carbon nanotubes are uniformly mixed with strong alkali or alkali metal carbonates so that the mass ratio of carbon nanotubes to strong alkalis or alkali metal carbonates is between 1:3 and 1:5 to obtain carbon A mixture of nanotubes and a strong base or a carbonate of an alkali metal; the strong base is preferably KOH or NaOH, and the carbonate of an alkali metal is preferably Na 2 CO 3 or K 2 CO 3 .

[0031] (2) heating the mixture obtained in step (1) to between 500°C and 900°C under the condition of cutting off oxygen, and calcining for 1 hour to 3 hours to obtain a calcined product;

[0032] (3) Washing and drying the calcined product obtained in step (2) to remove strong alkali or carbonate of alkali metal to obtain etched carbon nanotubes;

[0033] (4) Doping the etched carbon nanotubes obtained in step (3) with heteroatoms to obtain the carbon nano...

Embodiment 1

[0037] A carbon nanotube, a carbon nanotube doped with heteroatoms, X-ray photoelectron spectroscopy such as figure 1 As shown, wherein the mass ratio of heteroatoms is 4%, the surface of the carbon nanotube has a mesoporous structure, the average pore diameter of the mesopores is between 5nm, and the adsorption-desorption curve is as figure 2 As shown, the specific surface area of ​​the carbon nanotubes is 369.5m 2 / g between. The heteroatoms are nitrogen atoms and sulfur atoms, wherein the nitrogen element is 3% and the sulfur element is 1% in terms of mass percentage.

[0038] The nitrogen atoms are doped in the form of pyridine nitrogen, pyrrole nitrogen and graphitized nitrogen. Sulfur atoms are doped in the form of carbon-sulfur single bonds (C-S-C) and carbon-sulfur double bonds (-C=S-).

[0039] Described carbon nanotube, its preparation method, comprises the following steps:

[0040] (1) Mixing the carbon nanotubes and NaOH evenly so that the mass ratio of the ca...

Embodiment 2

[0047] A carbon nanotube is a heteroatom-doped carbon nanotube, wherein the mass ratio of the heteroatom is 11%, the surface of the carbon nanotube has a mesopore structure, and the average pore diameter of the mesopore is 2nm, and the carbon nanotube The specific surface area is 1200m 2 / g between. The heteroatoms are nitrogen atoms and boron atoms, wherein the nitrogen element is 9% and the boron element is 2% in terms of mass percentage.

[0048] The nitrogen atoms are doped in the form of pyridine nitrogen, pyrrole nitrogen and graphitized nitrogen. Boron atoms are doped in the form of carbon-boron single bonds (C-B-C), oxygen-boron single bonds (O-B-C) and nitrogen-boron single bonds (N-B-C).

[0049] Described carbon nanotube, its preparation method, comprises the following steps:

[0050] (1) Mix the carbon nanotubes and KOH evenly so that the mass ratio of the carbon nanotubes and KOH is 1:5 to obtain a mixture of the carbon nanotubes and KOH.

[0051] (2) heating ...

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Abstract

The invention discloses a carbon nanotube, and a preparation method and an application thereof. The carbon nanotube is a heteroatom-doped carbon nanotube, the mass ratio of heteroatoms is 3%-6%, the surface of the carbon nanotube has a mesoporous structure, the mesoporous average pore size is 2 nm-9 nm, and the specific surface area of the carbon nanotube is 150 m<2> / g-1200 m<2> / g. The preparation method comprises the following steps: (1) evenly mixing the carbon nanotube with an etching agent, and making the mass ratio be 1:3 to 1:5; (2) under an oxygen isolated condition, heating up to 500 DEG C-900 DEG C, and calcining for 1 h-3 h; (3) washing and drying; and (4) carrying out heteroatom doping. The specific surface area of the carbon nanotube can be improved, the catalytic activity of the carbon nanotube is increased, and the carbon nanotube has the advantages of simple process and low cost, and is applied to preparation of electrocatalysts having good performance.

Description

technical field [0001] The invention belongs to the field of nanomaterials, and more specifically relates to a carbon nanotube, its preparation method and application. Background technique [0002] Carbon nanotubes have the conductivity of metals or semiconductors, high absorption strength of broadband electromagnetic waves, and good adsorption, making them widely used in the field of physical chemistry. Especially in hydrogen storage, supercapacitors, molecular filters, adsorbents, fuel cell catalysts, etc., it has broad application prospects. Applications in these fields, in addition to certain requirements for the crystal structure of carbon nanotubes, have higher requirements for their specific surface area and pore volume. However, multi-walled carbon nanotubes can be prepared on a large scale at present, and their specific surface area is relatively low, generally at 200m 2 Below / g, it affects its application effect as hydrogen storage materials, supercapacitors, el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B01J27/24B01J21/18H01M4/90B82Y30/00
CPCY02E60/50
Inventor 王得丽武敏王彩王杰
Owner HUAZHONG UNIV OF SCI & TECH
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