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Array carbon nanotube as well as preparation method and application thereof

A technology of carbon nanotubes and arrays, applied in the field of arrayed carbon nanotubes and its preparation, can solve the problems of uneven distribution of carbon nanotube diameters, poor quality of carbon nanotubes, loss of active sites, etc., and achieve good uniform diameter properties, inhibition of active component source agglomeration, and the effect of inhibiting deposition

Pending Publication Date: 2021-03-19
QUJING FAYMO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalyst is easy to aggregate at high temperature and loses the active sites, resulting in problems such as uneven diameter distribution, small length-to-diameter ratio, and poor electrical conductivity of the prepared carbon nanotubes.
Therefore, it is necessary to provide a method for preparing carbon nanotubes, which can effectively improve the problem of poor quality of carbon nanotubes caused by catalyst aggregation.

Method used

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  • Array carbon nanotube as well as preparation method and application thereof
  • Array carbon nanotube as well as preparation method and application thereof
  • Array carbon nanotube as well as preparation method and application thereof

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preparation example Construction

[0034] see figure 1 , which is a flowchart of a method for preparing arrayed carbon nanotubes provided in an embodiment of the present application, including:

[0035] Step 100: uniformly mixing the carrier, intercalation agent, active component source and solvent, and drying to obtain a catalyst precursor;

[0036] Step 200: calcining the catalyst precursor, injecting water vapor during the calcining process, and obtaining the catalyst after cooling;

[0037] Step 300: Put the catalyst in the reactor, pass through the protective gas and carbon source, and obtain the arrayed carbon nanotubes by chemical vapor deposition.

[0038] In the embodiment of the present application, in step 100, the carrier has a layered structure. In some embodiments of the present application, the carrier includes one or more of expanded graphite, mica stone, hydrotalcite (LDH), montmorillonite, kaolin and rectorite. The layered carrier has a large specific surface area and has a high loading cap...

Embodiment 1

[0060] A method for preparing an array of carbon nanotubes, comprising the steps of:

[0061] (1) Add 30g hydrotalcite to 150mL water, stir for 0.5h, then add 20g sodium dodecylbenzenesulfonate, stir at 25°C for 12h to form a uniform suspension; mix 48g cobalt nitrate hexahydrate and 8g nitric acid hexahydrate Lanthanum was added to the suspension, stirred and filtered to obtain a filter residue. Dry the filter residue at 100°C to obtain a catalyst precursor.

[0062] (2) The catalyst precursor was calcined in a muffle furnace at 550°C for 2h, preactivated by passing water vapor at 550°C for 30min, and cooled to room temperature to obtain the catalyst.

[0063] (3) Add 0.3 g of catalyst into the quartz boat, then move to the fixed-bed reactor, raise the temperature to 750 °C at 10 °C / min under the atmosphere of nitrogen protection gas, stop feeding nitrogen and switch to feeding ethylene. React at 750° C. for 30 minutes to obtain a crude carbon nanotube array.

[0064] (4) ...

Embodiment 2

[0068] A method for preparing an array of carbon nanotubes, comprising the steps of:

[0069] (1) In a mixed solution of 200mL water and ethanol (V 水 :V 乙醇 =1:1) by adding 30g of expanded graphite and 25g of cetyltrimethylammonium bromide, stirring at 40°C for 12h to form a uniform suspension; adding 50g of nickel nitrate and 6g of tungsten nitrate into the suspension, stirring and filtering to obtain filter residue. Dry the filter residue at 100°C to obtain a catalyst precursor.

[0070] (2) The catalyst precursor was calcined in a muffle furnace at 500°C for 3h, preactivated by passing water vapor at 500°C for 60min, and cooled to room temperature to obtain the catalyst.

[0071] (3) Add 0.5 g of catalyst into the quartz boat, then move to the fixed-bed reactor, raise the temperature to 650 °C at 15 °C / min under the atmosphere of nitrogen protection gas, stop feeding nitrogen and switch to feeding methane. React at 650° C. for 30 minutes to obtain a crude carbon nanotube...

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Abstract

The invention provides a preparation method of an array carbon nanotube, which comprises the following steps: uniformly mixing a carrier, an intercalator, an active component source and a solvent, andconducting drying to obtain a catalyst precursor; calcining the catalyst precursor, introducing water vapor in the calcining process, and conducting cooling to obtain a catalyst; and putting the catalyst into a reactor, introducing protective gas and a carbon source, and carrying out chemical vapor deposition to obtain the array carbon nanotube. The preparation method is simple in process and convenient to operate, and the obtained array carbon nanotube has high length-diameter ratio and good conductivity. The invention further provides the array carbon nano tube. The array carbon nanotube has good conductivity, and the conductivity of an electrode material can be improved when the array carbon nanotube is applied to the electrode material.

Description

technical field [0001] The present application relates to the technical field of carbon nanotubes, in particular to an array carbon nanotube and its preparation method and application. Background technique [0002] Carbon nanotubes are a one-dimensional quantum material with a unique nano-hollow structure, which has the advantages of excellent conductivity and large specific surface area, and can be used as a conductive agent in lithium-ion batteries. The preparation methods of carbon nanotubes include arc discharge method, laser evaporation method and chemical vapor deposition method (CVD). The chemical vapor deposition method has the advantages of low cost, large output, and easy control of conditions, and is currently the most suitable method for industrial production of carbon nanotubes. The principle of the chemical vapor deposition method is that the gas containing carbon sources decomposes to form carbon atoms when flowing through the surface of the catalyst, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/158C01B32/16B82Y30/00B82Y40/00H01M4/62
CPCC01B32/158C01B32/16B82Y30/00B82Y40/00H01M4/625C01B2202/22C01B2202/36C01B2202/34Y02E60/10
Inventor 王敏万远鑫孔令涌黄少真任望保余永龙
Owner QUJING FAYMO TECH CO LTD
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