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A preparation method of ultrafine nitrogen-doped carbon hollow nanotubes and its products and applications

A technology of nitrogen-doped carbon and hollow nanometers, which is applied in the direction of carbon nanotubes, nanocarbons, chemical instruments and methods, etc., can solve the problems of high-quality carbon nanotubes, such as high prices and unfavorable large-scale practical applications, and achieve excellent electrical properties. The effect of chemical activity, low cost and wide source of raw materials

Active Publication Date: 2021-08-13
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] Generally speaking, the current methods for preparing carbon nanotubes have many problems in terms of cost, process route and product quality, which lead to high prices of high-quality carbon nanotubes, which is not conducive to its large-scale practical application.

Method used

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  • A preparation method of ultrafine nitrogen-doped carbon hollow nanotubes and its products and applications
  • A preparation method of ultrafine nitrogen-doped carbon hollow nanotubes and its products and applications
  • A preparation method of ultrafine nitrogen-doped carbon hollow nanotubes and its products and applications

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Effect test

Embodiment 1

[0028] (1) Ni(NO 3 ) 2 ·6H 2 O and Co(NO 3 ) 2 ·6H 2 O is mixed with ethanol at a mass ratio of 3:2, fully stirred to form a uniform solution, so that the total mass of nickel and cobalt and the mass of ethanol: the volume is 1g:100mL; then add 5 times the total mass of nickel and cobalt Carbon nanotubes (about 30 nm in diameter), sonicated for 1 hour to form a uniform dispersion;

[0029] (2) Add dicyandiamide whose mass is 10 times the total mass of nickel and cobalt to the above dispersion liquid, and continue to add rice starch after ultrasonication for 1 hour, so that the ratio of the mass of rice starch to the mass of dicyandiamide is 0.5 : 10, ultrasonic 2h, then the mixture is transferred to the ball mill to continue ball milling 4h; finally the mixture is taken out, evaporated ethanol at room temperature, the solid mixture obtained at 40 o C under vacuum drying 5h, obtains precursor;

[0030] (3) Put the above precursors in a tubular reactor, and in a nitrogen ...

Embodiment 2

[0034] (1) Ni(NO 3 ) 2 ·6H 2 O and Co(NO 3 ) 2 ·6H 2 O is mixed with ethanol at a mass ratio of 3:2, fully stirred to form a uniform solution, so that the total mass of nickel and cobalt and the mass of ethanol: the volume is 1g:100mL; then add 5 times the total mass of nickel and cobalt Carbon nanotubes (about 30 nm in diameter), sonicated for 1 hour to form a uniform dispersion;

[0035](2) Add dicyandiamide whose mass is 10 times the total mass of nickel and cobalt to the above dispersion liquid, and after ultrasonication for 1 hour, continue to add rice starch so that the ratio of the mass of rice starch to the mass of dicyandiamide is 1 : 10, ultrasonic 2h, then the mixture is transferred to the ball mill to continue ball milling 4h; finally the mixture is taken out, evaporated ethanol at room temperature, the solid mixture obtained at 40 o C under vacuum drying 5h, obtains precursor;

[0036] (3) Put the above precursors in a tubular reactor, and in a nitrogen atm...

Embodiment 3

[0040] (1) Ni(NO 3 ) 2 ·6H 2 O and Co(NO 3 ) 2 ·6H 2 O is mixed with ethanol at a mass ratio of 3:2, fully stirred to form a uniform solution, so that the total mass of nickel and cobalt and the mass of ethanol: the volume is 1g:100mL; then add 5 times the total mass of nickel and cobalt Carbon nanotubes (about 30 nm in diameter), sonicated for 1 hour to form a uniform dispersion;

[0041] (2) Add dicyandiamide whose mass is 10 times the total mass of nickel and cobalt to the above dispersion liquid, and continue to add rice starch after ultrasonication for 1 hour, so that the ratio of the mass of rice starch to the mass of dicyandiamide is 2 : 10, ultrasonic 2h, then the mixture is transferred to the ball mill to continue ball milling 4h; finally the mixture is taken out, evaporated ethanol at room temperature, the solid mixture obtained at 40 o C under vacuum drying 5h, obtains precursor;

[0042] (3) Put the above precursors in a tubular reactor, and in a nitrogen at...

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Abstract

The invention discloses a preparation method of ultrafine nitrogen-doped carbon hollow nanotubes. The main steps are: using ethanol as a solvent, uniformly dispersing nickel-cobalt salt on the surface of a dispersant, adding dicyandiamide and rice starch at the same time, and mixing evenly Finally, the ethanol is evaporated to form a solid mixture; and then the solid mixture is pyrolyzed at high temperature to obtain ultrafine nitrogen-doped carbon hollow nanotubes. The invention uniformly disperses the metal salt with catalytic effect, so that the catalytic core of the carbon nanotube growth is uniform and small in size, thereby ensuring the uniform distribution of the formed carbon nanotubes and small tube diameter. The carbon nanotube of the invention contains abundant nitrogen element and can be used as a highly active electrocatalyst for oxygen reduction reaction. The invention not only has low raw material cost, but also is simple and easy to operate, and can realize large-scale practical production of carbon nanotubes.

Description

technical field [0001] The invention belongs to the field of energy electrochemical materials, and specifically relates to a preparation method of ultrafine nitrogen-doped carbon hollow nanotubes and its products and applications Background technique [0002] Carbon nanotubes, also known as bucky tubes, are one-dimensional quantum materials whose radial dimensions are on the order of nanometers and axial dimensions are on the order of microns, and both ends of the tube are basically sealed. As a one-dimensional nanomaterial, carbon nanotubes are light in weight, perfectly connected in a hexagonal structure, and have many unusual mechanical, electrical, and chemical properties. They are especially widely used in the fields of electrochemical energy and electrochemical catalysis. From the results, carbon nanotubes can be regarded as curled graphene sheets, so according to the number of layers of graphene sheets, they can be divided into single-walled carbon nanotubes and multi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/16B01J27/24
CPCB01J27/24B01J35/0013B01J35/0033B01J35/0093C01B2202/20C01B2202/22C01B2202/36C01B32/16
Inventor 易清风杨孝昆陈瑶
Owner HUNAN UNIV OF SCI & TECH