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Nitrogen-doped carbon nano-material as well as preparation method and application thereof

A technology of carbon nanomaterials and nitrogen-doped carbon, applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of poor cathode oxygen reduction performance, etc., and achieve suitable for large-scale production, improve efficiency, and low cost Effect

Active Publication Date: 2014-08-13
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a nitrogen-doped carbon nanomaterial, its preparation method and application, the purpose of which is to improve the oxygen reduction of carbon nanomaterials by changing the active sites on the surface of carbon nanomaterials. Performance, thereby solving the technical problem of poor oxygen reduction performance of carbon nanomaterials as fuel cell cathodes

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  • Nitrogen-doped carbon nano-material as well as preparation method and application thereof

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preparation example Construction

[0034] The nitrogen-doped carbon nanomaterial, its preparation method, such as figure 1 shown, including the following steps:

[0035] (1) Mix the surface-activated carbon nanomaterial and the nitrogen-containing complex uniformly according to a mass ratio of 1:1 to 1:5 to obtain a precursor mixture.

[0036] In order to make the precursor mixture more uniform, it can be mixed as follows:

[0037] (a) adding carbon nanomaterials and nitrogen-containing complexes in a mass ratio of 1:1 to 1:5, adding them into deionized water and stirring thoroughly to obtain a suspension;

[0038] (b) Ultrasonic dispersing the suspension obtained in step (a) for 10 minutes to 30 minutes to make the dispersion uniform.

[0039] (c) Evaporating water from the suspension obtained in step (b) at 50°C to 70°C, then vacuum drying at 40°C to 80°C and grinding into powder to obtain the precursor mixture.

[0040] The surface-activated carbon nanomaterials are acid-treated carbon nanomaterials or gr...

Embodiment 1

[0050] A nitrogen-doped carbon nanomaterial, electron micrographs as figure 2 As shown, including nitrogen-containing heterocyclic compounds and carbon nanomaterials, wherein the mass content of nitrogen is 2%. The nitrogen existing in the nitrogen-containing heterocyclic compound is pyridine nitrogen, pyrrole nitrogen and graphitized nitrogen. The carbon nanomaterial is graphene oxide.

[0051] The nitrogen-doped carbon nanomaterial is prepared according to the following steps:

[0052] (1) Mix the surface-activated carbon nanomaterials and the nitrogen-containing complex uniformly at a mass ratio of 1:5 to obtain a precursor mixture.

[0053] In order to make the precursor mixture more uniform, it can be mixed as follows:

[0054] (a) adding carbon nanomaterials and nitrogen-containing complexes in a mass ratio of 1:5, adding them into deionized water and stirring thoroughly to obtain a suspension;

[0055] (b) Ultrasonic disperse the suspension obtained in step (a) for 3...

Embodiment 2

[0061] A nitrogen-doped carbon nanomaterial, electron micrographs as image 3 Shown, including nitrogen-containing heterocyclic compounds and carbon nanomaterials, wherein the mass content of nitrogen is 10.4%. The existence of nitrogen in the nitrogen-containing heterocyclic compound is pyridine nitrogen, pyrrole nitrogen and graphitized nitrogen, and its X-ray photoelectron energy fine spectrum (XPS) is as follows: Figure 4 shown. The carbon nanomaterials are carbon nanotubes.

[0062] The nitrogen-doped carbon nanomaterial is prepared according to the following steps:

[0063] (1) Mix the surface-activated carbon nanomaterials and the nitrogen-containing complex uniformly at a mass ratio of 1:5 to obtain a precursor mixture.

[0064] To make the precursor mixture more uniform, mix as follows:

[0065] (a) adding carbon nanomaterials and nitrogen-containing complexes in a mass ratio of 1:5, adding them into deionized water and stirring thoroughly to obtain a suspension;...

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Abstract

The invention discloses a nitrogen-doped carbon nano-material, a preparation method of the nitrogen-doped carbon nano-material and an application of the nitrogen-doped carbon nano-material to preparation of a negative electrode material of a fuel cell. The nitrogen-doped carbon nano-material is prepared from the components of nitrogen-containing heterocyclic compounds and a carbon nano-material, wherein the mass content of nitrogen is 2-10.4 percent. The preparation method comprises the steps of (1) uniformly mixing the surface-active carbon nano-material and a nitrogen-containing complex according to the mass proportion of 1 to (1-5), thus obtaining a precursor mixture; and (2) under the protective gas environment, raising the temperature of the precursor mixture obtained in the first step to 800-1,000 DEG C, and calcining for 2-40 hours. The nitrogen-doped carbon nano-material provided by the invention shows preferable oxygen reduction catalysis performance; the preparation method provided by the invention can be applied to various carbon nano-materials and is good in the adaptation; with the adoption of the preparation method, the whole preparation process is simple and easy to operate and is suitable and low in the cost.

Description

technical field [0001] The invention belongs to the field of carbon nanomaterials, and more specifically relates to a nitrogen-doped carbon nanomaterial, its preparation method and application. Background technique [0002] Carbon materials are widely distributed in the earth's crust and occupy a very important position in the field of energy and materials. Carbon nanomaterials have the advantages of high electrical conductivity, high surface area, low density, and simple preparation. It has good application prospects in fuel cells, lithium-ion batteries and supercapacitors. However, since carbon nanomaterials are all composed of carbon atoms and have few active sites, their activity as a fuel cell cathode oxygen reduction catalyst is relatively low. There are many ways to increase the active sites, the most common one is to change the benzene ring part in the carbon nanomaterial structure into a pyridine ring or other nitrogen-containing heterocycle through nitrogen dopin...

Claims

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Application Information

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IPC IPC(8): H01M4/90B01J27/24B82Y30/00
CPCY02E60/50B82Y30/00H01M4/9083
Inventor 王得丽王杰刘素芬何欢
Owner HUAZHONG UNIV OF SCI & TECH
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