Two-dimensional carbon nanosheet with thickness capable of being accurately controlled and preparation method thereof

A precise control, carbon nanosheet technology, applied in the field of materials, to achieve the effect of simplifying the assembly process, simple steps and good repeatability

Active Publication Date: 2021-01-22
NINGXIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thickness of two-dimensional carbon nanomaterials has an important impact on its catalytic performance and the exposure of active sites, but the precise control of the thickness of its two-dimensional carbon layer is still facing severe challenges.

Method used

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  • Two-dimensional carbon nanosheet with thickness capable of being accurately controlled and preparation method thereof
  • Two-dimensional carbon nanosheet with thickness capable of being accurately controlled and preparation method thereof
  • Two-dimensional carbon nanosheet with thickness capable of being accurately controlled and preparation method thereof

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Embodiment 1

[0038] This embodiment provides a two-dimensional carbon nanosheet whose thickness can be precisely controlled and its preparation method. The thickness of the carbon nanosheet whose thickness can be precisely regulated can be precisely regulated within the range of 5.1-92.3nm, and has good dispersibility, Intrinsic nitrogen doping with high specific surface area and atomically uniform distribution. The preparation method comprises the following steps:

[0039] (1) Preparation steps of two-dimensional polymer nanosheets whose thickness can be precisely controlled:

[0040] 1000 mg of amphiphilic alternating copolymer was dissolved in dimethylformamide (DMF) at a concentration of 20 mg / mL, the polymer solution was heated to 155 ° C in an oil bath, and kept at this temperature for 5 minutes, Cool to room temperature to obtain a dispersion containing two-dimensional polymer nanosheets. The dispersion was centrifuged, and the precipitate was washed three times with deionized wat...

Embodiment 2

[0045] This embodiment provides a two-dimensional carbon nanosheet whose thickness can be precisely controlled and a preparation method thereof. The preparation method includes the following steps:

[0046] (1) Preparation steps of two-dimensional polymer nanosheets whose thickness can be precisely controlled:

[0047] 1000 mg of amphiphilic alternating copolymer was dissolved in dimethylformamide (DMF) at a concentration of 30 mg / mL, the polymer solution was heated to 155 ° C in an oil bath, and kept at this temperature for 15 minutes, Cool to room temperature to obtain a dispersion containing two-dimensional polymer nanosheets. The dispersion was centrifuged, and the precipitate was washed three times with absolute ethanol, and dried in a vacuum oven for 24 hours to obtain a two-dimensional polymer nanosheet (in powder form) with a thickness of 13.2 nm.

[0048] (2) Preparation steps of two-dimensional carbon nanosheets whose thickness can be precisely controlled:

[0049]...

Embodiment 3

[0051] This embodiment provides a two-dimensional carbon nanosheet whose thickness can be precisely controlled and a preparation method thereof. The preparation method includes the following steps:

[0052] (1) Preparation steps of two-dimensional polymer nanosheets whose thickness can be precisely controlled:

[0053] 1000 mg of amphiphilic alternating copolymer was dissolved in dimethylformamide (DMF) at a concentration of 50 mg / mL, the polymer solution was heated to 155 ° C in an oil bath, and kept at this temperature for 20 minutes, Cool to room temperature to obtain a dispersion containing two-dimensional polymer nanosheets. The dispersion was centrifuged, and the precipitate was washed 3 times with acetone, and dried in a vacuum oven for 24 hours to obtain a two-dimensional polymer nanosheet (in powder form) with a thickness of 38.6 nm.

[0054] (2) Preparation steps of two-dimensional carbon nanosheets whose thickness can be precisely controlled:

[0055] Under the pr...

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Abstract

The invention provides a two-dimensional carbon nanosheet with the thickness capable of being accurately controlled and the preparation method thereof, wherein the thickness of the carbon nanosheet with the thickness capable of being accurately controlled can be accurately controlled from 5.1 nm to 92.3 nm, and the carbon nanosheet has a high specific surface area and intrinsic nitrogen doping with atomic-scale uniform distribution. The preparation method comprises the following steps: by taking 4,4'-biphenyl diamine and 1,2,4,5-pyromellitic dianhydride as monomers, carrying out stepwise polymerization to form an amphiphilic alternating copolymer; by using the amphiphilic alternating copolymer as an assembly unit, carrying out an intramolecular imidization reaction to induce the amphiphilic alternating copolymer to perform crystallization driving self-assembly, thereby forming the polymer nanosheet of which the thickness can be accurately controlled; and calcining the polymer nanosheetin an inert atmosphere to obtain the two-dimensional carbon nanosheet with accurately controllable thickness. The two-dimensional carbon nanosheet has high specific surface area and atomic-scale uniformly distributed intrinsic nitrogen doping, can be used as a catalyst for electrocatalytic oxygen reduction, shows excellent electrocatalytic performance and can be used as a catalyst of a fuel cell.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a two-dimensional carbon nanosheet whose thickness can be precisely controlled and a preparation method thereof. Background technique [0002] With the increasing consumption of fossil energy, the energy crisis has become increasingly prominent. In addition, the excessive consumption of fossil energy such as coal will also bring serious environmental problems, such as air pollution, soil and water pollution. Therefore, it is very important to find clean and renewable energy that can replace fossil energy. Renewable energy mainly includes: wind energy, solar energy, tidal energy and biomass energy, etc. Due to the limitation of natural conditions, it is difficult for the above-mentioned primary energy to be directly utilized. In order to make better use of these renewable energies, it is necessary to establish energy conversion and storage systems to convert renewable primary en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J21/18B01J35/02B01J35/10B82Y30/00B82Y40/00C01B32/15B01J20/28B01J20/20B01J20/30
CPCB01J35/1019B01J35/023B01J35/1023B01J27/24B01J21/18B01J35/0033C01B32/15B01J20/205B01J20/28007B01J20/28061B01J20/28064B82Y30/00B82Y40/00C01P2002/01C01P2004/04C01P2002/85
Inventor 孙辉李霄赖小勇靳凯王晓中杨庆凤
Owner NINGXIA UNIVERSITY
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