A kind of composite material, its preparation method and application

A technology of composite materials and carbon nanomaterials, which is applied in the field of composite materials and its preparation, can solve the problems of complex process, low nitrogen doping amount, low cathode oxygen reduction activity, etc., and achieve simple preparation process, increase nitrogen doping amount, Favorable effect for mass production

Active Publication Date: 2017-02-01
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 composite material, its preparation method and application, the purpose of which is to increase the nitrogen atom content of carbon nanomaterials through the method of supramolecular gel-assisted preparation of nitrogen-doped composite materials. At the same time, metal cobalt is introduced into the material, thereby solving the technical problems of low nitrogen doping content of carbon nanomaterials, complex process and low oxygen reduction activity as a fuel cell cathode.

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  • A kind of composite material, its preparation method and application
  • A kind of composite material, its preparation method and application
  • A kind of composite material, its preparation method and application

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preparation example Construction

[0034] Composite material provided by the invention, its preparation method, comprises the following steps:

[0035] (1) Mix melamine, concentrated acid and water, wherein the mass ratio of melamine to concentrated acid is 1:1 to 2:5, and the mass ratio of melamine to water is 1:25-1:30, at 70°C to 90°C heated to transparent to obtain a transparent solution; the concentrated acid is preferably the concentrated sulfuric acid, concentrated nitric acid or concentrated phosphoric acid that can coordinate with melamine, wherein the common concentration of concentrated sulfuric acid is 98%, and the common concentration of concentrated nitric acid is 65%. The common concentration of concentrated phosphoric acid is 85%;

[0036] (2) Add carbon nanomaterials and cobalt salts to the transparent solution prepared in step (1) and mix evenly, wherein the mass ratio of carbon nanomaterials and melamine is 1:2-1:8, and the mass ratio of cobalt salts and melamine It is 1:1-1:6, and cooling o...

Embodiment 1

[0042] A composite material whose transmission electron microscope structure is as figure 1 As shown, it has a core-shell structure with metal cobalt as the core and Vulcan XC-72 doped with nitrogen atoms as the shell. The surface of the metal cobalt core is also uniformly wrapped with cobalt oxide. figure 2 As shown, the diameter of the core-shell structure is between 60nm and 70nm, wherein the doping amount of nitrogen atoms is 9.6%, and the mass fraction of cobalt element is 20%. image 3 shown.

[0043] The nitrogen atom is doped with pyridine nitrogen, pyrrole nitrogen and quaternary nitrogen, and its X-ray photoelectron energy fine spectrum (XPS) is as follows: Figure 4 shown.

[0044] Described composite material, its X-ray diffraction pattern (XRD) such as Figure 5 Shown, its preparation method comprises the following steps:

[0045] (1) Mix melamine and concentrated nitric acid with a concentration of 65% with water, wherein the mass ratio of melamine to concen...

Embodiment 2

[0050] A kind of composite material, the photo of electron microscope is as follows Image 6 As shown, it has a core-shell structure with metal cobalt as the core and nitrogen atom-doped CNT as the shell. The surface of the metal cobalt core is also uniformly wrapped with cobalt oxide. The doping amount of atoms is 6.8%, and the mass fraction of cobalt element is 15%.

[0051] The nitrogen atoms are doped in the form of pyridine nitrogen, pyrrole nitrogen and quaternary nitrogen.

[0052] Described composite material, its preparation method, comprises the following steps:

[0053] (1) Mix melamine, concentrated sulfuric acid with a concentration of 98% and water, wherein the mass ratio of melamine to concentrated sulfuric acid is 1:2, and the mass ratio of melamine to water is 1:28, and heat to transparent at 70°C to obtain transparent solution;

[0054] (2) add in the transparent solution that makes in step (1), CNT and cobalt chloride mix homogeneously, wherein the mass r...

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Abstract

The invention discloses a composite material as well as a preparation method and an application thereof. The composite material has a core-shell structure which takes cobalt metal as an inner core and carbon nanomaterial doped with nitrogen atoms as a shell, wherein the surface of the cobalt metal inner core is evenly wrapped with cobalt oxide, the doping content of the nitrogen atoms is within the range of 2-9.6%, and the mass fraction of cobalt element is within the range of 5-20%. The preparation method comprises the following steps: (1) mixing melamine, concentrated acid and water in proportion, and heating until the mixture is transparent; (2) feeding the carbon nanomaterial and cobalt salt, evenly mixing and cooling; (3) drying; (4) heating up to 500-800 DEG C under the condition of insulating oxygen, and calcining for 2-10 hours. The carbon-cobalt composite nanomaterial is higher in nitrogen doping amount, has better oxygen reduction catalytic activity and stability, and is simple in preparation technology and low in cost, thus being suitable for large-scale production.

Description

technical field [0001] The invention belongs to the field of nanomaterials, and in particular relates to a composite material, its preparation method and application. Background technique [0002] Carbon nanomaterials have good electrical conductivity, high specific surface area, strong adsorption and other advantages, and are widely used in many fields. Due to the advantages of high energy conversion efficiency, environmental protection and safety, fuel cells and metal-air batteries have become research hotspots in recent years. Studies have shown that doping heteroatoms in carbon nanomaterials can significantly improve the oxygen reduction catalytic activity of carbon nanomaterials, and can effectively improve battery performance when applied to fuel cells and metal-air batteries. [0003] At present, the carbon nanomaterials prepared in industry have low nitrogen doping amount, so the catalytic activity of oxygen reduction is not high. Existing doping technologies mostl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/92H01M4/90
CPCB82Y30/00H01M4/90H01M12/06
Inventor 王得丽吴则星王杰刘素芬何欢
Owner HUAZHONG UNIV OF SCI & TECH
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