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Metal nanoparticle embedded graphene as well as preparation method and application thereof

A metal nanoparticle, graphene technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, electrodes, etc., can solve the problem of unfavorable catalyst performance and stability, easy shedding, catalytic activity and stability Unsatisfactory properties and other problems, to achieve the effects of excellent long-term stability, strong structure, and excellent catalytic performance

Active Publication Date: 2021-03-05
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most transition metal-based catalysts have poor catalytic activity and stability under high current conditions.
In addition, most of the catalysts coated on the electrodes are in the form of powders, which are particularly easy to fall off under high current density, which is extremely detrimental to the performance and stability of the catalysts

Method used

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  • Metal nanoparticle embedded graphene as well as preparation method and application thereof
  • Metal nanoparticle embedded graphene as well as preparation method and application thereof
  • Metal nanoparticle embedded graphene as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The preparation of the graphene-like nanosheet catalyst embedded in interconnected nickel nanoparticles comprises the following steps:

[0054] (1) The carbon source was pressed under 15 MPa for 2 minutes by a physical tablet method to prepare a 300 mg sheet-like solid.

[0055] (2) Place the flake solid obtained in step (1) in a quartz boat, place the foamed nickel cleaned up in the deposition area, and prepare it with the atmospheric pressure physical meteorological transmission method. High-purity argon is the carrier gas, and the gas flow rate is 50sccm, the temperature is 550°C, and the time is 10 hours, to obtain a graphene-like nanosheet catalyst interconnected with nickel nanomesh particles.

[0056] In the present embodiment, the organic small molecule that carbon source adopts is hexabromobenzene, and its structural formula is shown in following formula I:

[0057]

[0058] The scanning electron microscope of the catalyst described in this example is as fo...

Embodiment 2

[0068] Other preparation processes are the same as in Example 1 of the present invention, only foamed nickel is replaced by foamed iron.

[0069] Catalyst described in this embodiment, scanning electron microscope such as Figure 10 As can be seen from the figure, the catalyst prepared in this example is a film completely covered on the iron foam substrate.

[0070] Catalyst described in this embodiment, X-ray energy spectrum such as Figure 11 As shown, it can be seen from the figure that the catalyst prepared in this embodiment mainly contains three elements: carbon, bromine and iron.

[0071] Catalyst described in this embodiment, transmission electron microscope such as Figure 12 As shown, it can be seen from the figure that the catalyst is embedded in graphene-like interconnected iron nanoparticles, and has a clear lattice with a measured value of 0.24 nanometers, which belongs to the iron (101) crystal plane.

[0072] Catalyst described in the present embodiment, ene...

Embodiment 3

[0076] The other preparation processes are the same as in Example 1 of the present invention, only the nickel foam is replaced by nickel-iron foam (the content ratio of nickel-iron is 1:1).

[0077] Catalyst described in this embodiment, scanning electron microscope such as Figure 16 As shown, it can be seen from the figure that the catalyst prepared in this embodiment is a layer of film completely covered on the iron foam substrate, and there are many dense, rough flakes standing uniformly on the film.

[0078] Catalyst described in this embodiment, X-ray energy spectrum such as Figure 17 shown by Figure 17 It can be seen that the catalyst prepared in this example mainly contains four elements: carbon, bromine, iron and nickel.

[0079] Catalyst described in this embodiment, transmission electron microscope such as Figure 18 shown by Figure 18 It can be seen that the catalyst is embedded in graphene-like particles by interconnected iron and nickel nanoparticles, and ...

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Abstract

The invention discloses metal nanoparticle embedded graphene as well as a preparation method and application thereof. The preparation method comprises the following steps: taking small organic molecules as a carbon source, putting the small organic molecules into a quartz boat, and performing direct depositing on a metal substrate by utilizing a normal-pressure physical vapor transport method, thereby obtaining a metal nanoparticle embedded graphene catalyst. The interconnected metal nanoparticle embedded graphene nanosheet catalyst is synthesized by adopting a solid-phase migration method, has multiple pores and a large surface area, can provide more effective active sites, and has good conductivity and mechanical stability to the active sites; and the method is of great significance foreconomically and efficiently acquiring low-cost, safe and environment-friendly catalyst in large-scale industrialization.

Description

technical field [0001] The invention relates to a graphene-like embedded in metal nanoparticles and a preparation method and application thereof, belonging to the field of electrocatalysts. Background technique [0002] At present, the energy crisis and environmental issues are getting more and more attention, and the development of safe, environment-friendly and low-cost energy conversion and storage equipment has become an effective way to solve the energy crisis. After several generations of unremitting efforts, electrochemical water splitting technology has become a practical and scalable hydrogen and oxygen production technology, which can be combined with other renewable energy sources such as solar energy and wind energy. At the same time, the commercialization of electrochemical water splitting has broad application prospects and plays an indispensable role in the field of energy applications. However, the two half-reactions involved in electrochemical water splitti...

Claims

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Application Information

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IPC IPC(8): B01J23/755B01J23/745B01J27/06C25B1/04C25B11/091
CPCB01J23/755B01J23/745B01J27/06C25B1/04B01J35/23B01J35/33Y02E60/36
Inventor 江浪张静江文杰胡劲松牛帅
Owner INST OF CHEM CHINESE ACAD OF SCI
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