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Preparation method for modified graphene microchip wave-absorbing composite powder through nickel-cobalt particles

A graphene microchip, nickel-cobalt alloy technology, applied in metal processing equipment, metal material coating process, liquid chemical plating and other directions, can solve the problem that graphene cannot fully meet the performance and other problems

Active Publication Date: 2020-04-28
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In many fields, a single graphene cannot fully meet the required properties, and surface modification is required to meet the use requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: a kind of preparation method of the surface deposition metal nickel-cobalt alloy particle of graphene microchip, it carries out as follows: first carry out activation pretreatment to graphene microchip, Graphene microchip is soaked in the nitric acid of 1:1 In the solution, disperse under mechanical stirring for 12 hours, then wash the nitric acid solution to pH>5, filter the graphene microchip solution and take it out for later use; take the cobalt salt solution, and the solution components are as follows: nickel sulfate 4g / L, cobalt sulfate 8g / L, sodium citrate 60g / L, boric acid 30g / L, sodium hypophosphite 53g / L, pH 9~10. Disperse the filtered graphene microflakes after acidification into the above-mentioned salt solution, and disperse them together by mechanical stirring and ultrasonic vibration, the ultrasonic power is 300W, and the mechanical stirring rate is 2000r / min. Then put the dispersed graphene slurry into the reactor, and put the reactor into...

Embodiment 2

[0017] Embodiment 2: The difference between the present embodiment and Example 1 is that the nickel-cobalt salt solution composition: cobalt sulfate 28g / L, nickel sulfate 14g / L, potassium sodium tartrate 112g / L, ammonium sulfate 66g / L, hypophosphorous acid Sodium 21g / L, pH 9~10. Other steps and parameters are the same as in Example 1.

Embodiment 3

[0018] Embodiment 3: The difference between the present embodiment and Example 1 is that the nickel-cobalt salt solution composition: cobalt chloride 24g / L, nickel sulfate 12g / L, sodium citrate 120g / L, sodium tetraborate 6g / L, boron Potassium hydride 1.6g / L, pH 10~11. Reactor temperature 150 ℃, other steps and parameter are identical with embodiment 1.

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Abstract

The invention relates to a preparation method for modified nickel-cobalt composite powder on the surfaces of graphene microchips. The method is characterized by comprising the steps that a certain quantity of graphene microchips are soaked in oxidizing acid (for example, a 1:1 nitric acid solution) for corrosion activation, and mechanical stirring is performed for 12 hours or longer; then, the graphene microchips are washed and taken out and mixed with a nickel-cobalt salt solution containing a complexing agent and a reducing agent; under the combined action of ultrasonic concussion and mechanical stirring, the graphene microchips are evenly dispersed into the nickel-cobalt salt solution to form slurry, the obtained slurry is poured into a reaction kettle, a reaction is performed for 2-12hours at 120-200 DEG C, and the reduced nickel-cobalt particles can be attached to the surfaces of the graphene microchips in the process; and after the reaction is ended, the reaction kettle is takenout, after being naturally cooled to the room temperature, the reaction kettle is opened to take out the graphene composite powder after being subjected to the reaction, and the powder is dried in avacuum drying box at 50 DEG C. The nickel content of the prepared nickel-cobalt component is higher than its cobalt content in the initial stage of deposition of the alloy particles, the point particle of nickel deposition is adopted for chemocatalysis, cobalt deposition is promoted, and after a certain period, the content ratio of nickel to cobalt after being deposited is close to 1:1. The obtained nickel-cobalt modified graphene powder has the composite wave absorption effects such as electricity loss and magnetism loss.

Description

technical field [0001] The invention relates to a surface modification process of graphene microchips, in particular to a method for preparing nickel-cobalt alloy particles modified graphene microchips for wave-absorbing composite powder. Background technique [0002] Since graphene was discovered in 2004, its excellent performance has been favored by many scientific researchers. In recent years, it has been widely used in batteries, sensors, catalysis, electromagnetic wave absorption, supercapacitors and other fields. In many fields, a single graphene cannot fully meet the required properties, and surface modification is required to meet the use requirements. Loading metal particles or grafted polymer segments on the surface of graphene is a common modification method. [0003] Loading magnetic metal particles on the surface of graphene can make graphene better applied in fields such as electromagnetic shielding, and the attachment of magnetic particles has a good effec...

Claims

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Application Information

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IPC IPC(8): B22F1/02B22F9/24C23C18/50C23C18/18
CPCB22F9/24C23C18/50C23C18/1882B22F1/17
Inventor 王春雨张鹏钟博
Owner HARBIN INST OF TECH AT WEIHAI
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