Hollow nitrogen-doped nickel oxide/nickel/carbon composite material, preparation method and application

A technology of carbon composite materials and nitrogen doping, applied in the fields of magnetic/electric field shielding, electrical components, etc., can solve problems such as cumbersome procedures, complex processes, and unsuitable for mass production

Active Publication Date: 2021-05-04
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the method of depositing magnetic loss agents on existing templates is generally cumbersome and complicated, and is not suitable for mass production. Therefore, it is imperative to seek a carbon-based metal composite material with a simple preparation process.

Method used

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  • Hollow nitrogen-doped nickel oxide/nickel/carbon composite material, preparation method and application
  • Hollow nitrogen-doped nickel oxide/nickel/carbon composite material, preparation method and application
  • Hollow nitrogen-doped nickel oxide/nickel/carbon composite material, preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A preparation method of hollow flower-shaped nitrogen-doped nickel oxide / nickel / carbon composite material, see figure 1 shown, including the following steps:

[0032] First, 0.005molNiSO 4 ·6H 2 O, 0.004mol of glucose and 0.005mol of hexamethylenetetramine were sequentially added into 40ml of deionized water, and fully stirred on an electromagnetic stirrer for 30min to obtain a uniform green solution. The solution was then poured into a hydrothermal reaction kettle with a capacity of 50 ml. Put the hydrothermal reaction kettle into the oven and react at 180°C for 24h. After the reaction, use deionized water and ethanol to centrifuge wash (7000rpm, 3min) more than three times. Then put the product into a vacuum drying oven and dry (80°C, 12h) to obtain a brown solid powder nickel / carbon composite (P-Ni / C); the hexamethylenetetramine can be Diamine or hexamethylenetriamine instead;

[0033] in N 2 Under atmosphere, P-Ni / C was sintered at 700°C (heating rate 5°C / min...

Embodiment 2

[0035] A preparation method of hollow flower-shaped nitrogen-doped nickel oxide / nickel / carbon composite material, see figure 1 shown, including the following steps:

[0036] First, 0.005molNiSO 4 ·6H 2O, 0.004mol of glucose and 0.005mol of hexamethylenetetramine were sequentially added into 40ml of deionized water, and fully stirred on an electromagnetic stirrer for 30min to obtain a uniform green solution. The solution was then poured into a hydrothermal reaction kettle with a capacity of 50 ml. Put the hydrothermal reaction kettle into the oven and react at 180°C for 24h. After the reaction, use deionized water and ethanol to centrifuge wash (7000rpm, 3min) more than three times. Then put the product into a vacuum drying oven and dry (80°C, 12h) to obtain a brown solid powder nickel / carbon composite (P-Ni / C); the hexamethylenetetramine can be Diamine or hexamethylenetriamine instead;

[0037] in N 2 Under atmosphere, P-Ni / C was sintered at 800°C (heating rate 5°C / min)...

Embodiment 3

[0039] A preparation method of hollow flower-shaped nitrogen-doped nickel oxide / nickel / carbon composite material, see figure 1 shown, including the following steps:

[0040] First, 0.005molNiSO 4 ·6H 2 O, 0.004mol of glucose and 0.005mol of hexamethylenetetramine were sequentially added into 40ml of deionized water, and fully stirred on an electromagnetic stirrer for 30min to obtain a uniform green solution. The solution was then poured into a hydrothermal reaction kettle with a capacity of 50 ml. Put the hydrothermal reaction kettle into the oven and react at 180°C for 24h. After the reaction, use deionized water and ethanol to centrifuge wash (7000rpm, 3min) more than three times. Then put the product into a vacuum drying oven and dry (80°C, 12h) to obtain a brown solid powder nickel / carbon composite (P-Ni / C); the hexamethylenetetramine can be Diamine or hexamethylenetriamine instead;

[0041] in N 2 Under atmosphere, sinter P-Ni / C at 900°C (heating rate 5°C / min) for ...

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Abstract

The invention discloses a preparation method of a hollow flower-shaped nitrogen-doped nickel oxide/nickel/carbon composite material, and relates to the technical field of electromagnetic absorption materials. The preparation method comprises the following steps of: S1, sequentially dispersing water-soluble nickel salt, glucose and hexamethylenetetramine into a water solvent, and carrying out hydrothermal reaction at 170-190 DEG C for 20-36 hours to obtain a nickel/carbon compound; and S2, sintering the nickel/carbon compound obtained in the step S1 in a nitrogen atmosphere at 700-900 DEG C for 2-4 hours, then placing the sintered nickel/carbon compound in an air atmosphere, heating the sintered nickel/carbon compound to 250-350 DEG C, and keeping the temperature for 8-15 minutes to obtain the hollow flower-shaped nitrogen-doped nickel oxide/nickel/carbon composite material. A porous carbon/metal composite material is subjected to pyrolysis conversion by adopting a precursor, so that a porous carbon framework beneficial to electromagnetic wave reflection is realized, nano metal particles are uniformly introduced into the framework, a composite interface is increased, impedance matching is favorably improved, and the absorption bandwidth is increased.

Description

technical field [0001] The invention relates to the technical field of electromagnetic absorption materials, in particular to a hollow flower-shaped nitrogen-doped nickel oxide / nickel / carbon composite material, a preparation method and an application. Background technique [0002] With the discovery and rapid development of electromagnetic wave technology, it has provided many conveniences for modern life. Thanks to electromagnetic wave technology, we can use mobile phones, microwave ovens, and X-rays. In the military field, satellite communications, radio waves, radar, medical treatment and weaponry are all inseparable from electromagnetic waves. But everything has two sides. While electromagnetic waves bring us convenience, they will also cause electromagnetic pollution to the environment. High-frequency electromagnetic waves will also cause certain hidden dangers to the human body and cause electromagnetic interference to electronic devices. Generally speaking, electroma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00
CPCH05K9/0088
Inventor 梁瑾孔杰赵彬男陈军
Owner NORTHWESTERN POLYTECHNICAL UNIV
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