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Preparation method and application of heteroatom-doped porous carbon nano-tube

A technology of nanotubes and porous carbon, applied in the direction of carbon nanotubes, nanotechnology for materials and surface science, nanocarbons, etc., can solve the problems of reduced electrical conductivity, inappropriate electrochemical fields, etc., and achieve specific capacitance Large, high yield, good cycle stability

Inactive Publication Date: 2014-07-02
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this prior art, the material prepared by polyphosphazene-coated carbon nanotubes is a composite material, and since polyphosphazene itself is an insulating material, the electrical conductivity of the composite material is greatly reduced compared with that of carbon nanotubes. Not suitable for use in electrochemistry

Method used

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  • Preparation method and application of heteroatom-doped porous carbon nano-tube
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  • Preparation method and application of heteroatom-doped porous carbon nano-tube

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Experimental program
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Embodiment 1

[0031] This embodiment includes the following steps:

[0032] 1) Preparation of polyphosphazene nanotubes: add 0.5g of hexachlorocyclotriphosphazene and 1.08g of 4,4,'-dihydroxydiphenylsulfone into a 250mL flask, then add 100mL of anhydrous tetrahydrofuran, stir to dissolve, and then add The 50 tetrahydrofuran solution in which 2 mL of triethylamine was dissolved was added to the above reactor, and the reaction was vigorously stirred with an ultrasonic cleaner for half an hour at 25 ° C. After the reaction was completed, the crude product was filtered and washed three times with ethanol and then with deionized water. three times, and dried to obtain white polyphosphazene nanotubes.

[0033] 2), weigh 0.5g of polyphosphazene nanotube powder in a porcelain boat, put it into a tube furnace, pass inert gas nitrogen for 1 hour to replace the air in the tube cavity, and then heat up to 500 °C at a heating rate of 5 °C / min. ℃, constant temperature at 500 ℃ for 5 hours, then heated t...

Embodiment 2

[0041] The difference from Example 1 is that the maximum carbonization temperature is 800°C.

[0042] Figure 7 Nitrogen adsorption curve and pore size distribution curve of carbon nanotubes obtained by carbonization at 800°C under the conditions of Example 2.

[0043] The material structure analysis shows that the prepared heteroatom-doped porous material still has a good tubular morphology, which is consistent with the morphology of the precursor polyphosphazene nanotubes. After carbonization at 800℃, the specific surface area of ​​the material is 520.7m 2 / g, the porosity is 0.353cm 3 / g. The pore size distribution is narrow, with a pore size of about 4 nm.

[0044] Figure 8 It is a cyclic voltammogram of carbon nanotubes obtained by carbonization at 800° C. under the conditions of Example 2 at a scan rate of 2 mv / s. Electrochemical analysis of the material shows that the specific capacity of the material obtained by carbonization at 800 °C reaches 168 F / g at a scan ...

Embodiment 3

[0046] The difference from Example 1 is that the inert gas used is argon, and the heating rate is 3°C / min.

[0047] The material structure analysis shows that the prepared heteroatom-doped porous material still has a good tubular morphology, which is consistent with the morphology of the precursor polyphosphazene nanotubes. After carbonization at the highest temperature of 900℃, the specific surface area of ​​the material reaches 788.3m 2 / g, the porosity is 0.590cm 3 / g, the pore size distribution is narrow, and the pore size is about 4nm.

[0048] The electrochemical analysis of the material shows that the specific capacity of the material obtained by carbonization at 900 °C reaches 160 F / g at a scan rate of 2 mv / s.

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Abstract

The invention discloses a preparation method and application of a heteroatom-doped porous carbon nano-tube in the technical field of the inorganic carbon nano industry. The carbon nano-tube prepared by using a polyphosphazene nano-tube as a precursor has relatively large specific surface area, and abundant mesoporous structures are formed on the tube wall of the carbon nano-tube. According to the invention, the preparation process is simple in technology and high in yield; the prepared carbon nano-tube is regular in shape and appearance and high in heteroatom content, and has good capacitive performance when being used as an electrode material of a super-capacitor. Charge and discharge tests show that a sample subjected to carbonization at 900 DEG C has the specific capacity of 190F / g and excellent cycling stability.

Description

technical field [0001] The invention relates to a method in the technical field of inorganic carbon nanomaterials, in particular to a preparation method of heteroatom-doped porous carbon nanotubes and the application of supercapacitors. Background technique [0002] With the rapid development of the global economy, the consumption of fossil fuels and the increasingly serious environmental pollution, people are urged to develop new, efficient, clean and sustainable energy supply systems and technologies related to energy conversion and storage. [0003] Among many application fields, the most effective and practical electrochemical energy storage and conversion devices are super cells, fuel cells, electrochemical supercapacitors, etc. In recent years, supercapacitors have attracted much attention due to their high energy density, long cycle life, and their bridging role between high-energy batteries, fuel cells, and traditional low-energy bipolar plate capacitors. [0004] I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B82Y30/00B82Y40/00H01G11/24H01G11/44C01B32/16
CPCY02E60/13
Inventor 黄小彬陈奎永刘洪唐小真
Owner SHANGHAI JIAO TONG UNIV
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