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Monatomic material, preparation method and application thereof

An atomic and plasma technology, used in chemical instruments and methods, catalyst activation/preparation, electrodes, etc., can solve the problems of limited form of single-atom materials, difficult to achieve controllable preparation, and low single-atom loading.

Active Publication Date: 2019-09-20
TSINGHUA BERKELEY SHENZHEN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the above literature has provided some help to the development of the current single-atom materials, there are still problems such as the limited form of single-atom materials, difficulty in achieving controllable preparation, and low single-atom loading.

Method used

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  • Monatomic material, preparation method and application thereof
  • Monatomic material, preparation method and application thereof
  • Monatomic material, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] A preparation method of a monatomic material comprises the steps of:

[0071] (1) The monoatomic layer molybdenum disulfide precursor is placed in the reaction chamber, and the reaction chamber is evacuated until the vacuum degree of the reaction chamber is 1.5mbar;

[0072] (2) Inject hydrogen at a flow rate of 20 sccm for 2 minutes until the air pressure is stable;

[0073] (3) An AC power source with a frequency of 100 kHz was used to excite the plasma, the precursor was treated with the plasma, the reaction temperature was controlled at 60° C., and the processing time was 80 s to obtain a molybdenum single-atom material.

[0074] figure 2 is an atomically resolved transmission electron microscope image of the molybdenum single-atom material, image 3 and Figure 4 The transmission electron microscope images and simulation images of the molybdenum single-atom materials of type 1 are shown respectively. It can be seen from the figure that the prepared molybdenum s...

Embodiment 2

[0077] The difference from Example 1 is that the plasma treatment time in step (3) is 160s.

Embodiment 3

[0079] The difference from Example 1 is that in step (3) an AC power source with a frequency of 20 kHz is used to excite the plasma, the precursor is treated with the plasma, the reaction temperature is controlled at 200° C., and the treatment time is 240 s to obtain a molybdenum monoatomic material.

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Abstract

The invention relates to a monatomic material, a preparation method and application thereof. The method comprises the following steps: treating a precursor by adopting plasma to obtain a monatomic material, wherein elements in the monatomic material comprise metal elements. The invention creatively provides the method for preparing the monatomic material containing the metal elements by adopting the plasma, and the controllable preparation of a series of monatomic materials is realized by controlling the gas type and flow rate of the introduced reaction atmosphere and the reaction time and temperature. The preparation method provided by the invention can realize single-atom preparation of a single element and single-atom preparation of multiple elements. The monatomic material is used as a hydrogen evolution electrocatalyst and can be simultaneously suitable for catalyzing acidic and alkaline systems to perform water electrolysis hydrogen evolution, and the current density during hydrogen production can reach 2 A / cm<2>, so that the monatomic material can better adapt to industrial-level high-current-density water electrolysis hydrogen production.

Description

technical field [0001] The invention belongs to the technical field of single-atom materials, and in particular relates to a single-atom material, its preparation method and application. Background technique [0002] Since the first report, due to their excellent catalytic activity, high active center utilization and unique physical and chemical properties, many scholars have invested in the research and application of single-atom materials. It is currently a major challenge in this field to develop efficient, universal, and high single-atom loading preparation methods. [0003] At present, the preparation of single-atom materials is mainly achieved by thermal diffusion, in situ pyrolysis, template synthesis, or ion exchange methods. These single-atom materials are limited to the form of powder or mesoporous materials, which limits their applications in some fields. [0004] CN109225257A discloses a supported single-atom catalyst and its preparation method. The catalyst is...

Claims

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Application Information

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IPC IPC(8): B01J27/051B01J27/047B01J23/28B01J23/30B01J23/18B01J23/08B01J23/42B01J37/34C25B1/04C25B11/06
CPCB01J27/051B01J27/047B01J23/28B01J23/30B01J23/18B01J23/08B01J23/42B01J37/349C25B1/04C25B11/091B01J35/33Y02E60/36
Inventor 刘碧录罗雨婷
Owner TSINGHUA BERKELEY SHENZHEN INST