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Method for preparing porous carbon nanosheet through pyrolysis of two-dimensional covalent organic framework

A technology of covalent organic framework and porous carbon, applied in the direction of nano-carbon, hybrid capacitor electrodes, etc., can solve the problem of low specific capacitance of porous carbon materials, achieve good conductivity and accelerate the mass transfer process

Pending Publication Date: 2021-12-28
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the existing technical problem of low specific capacitance of porous carbon materials prepared by COF, and provides a method for preparing porous carbon nanosheets by pyrolysis of two-dimensional covalent organic frameworks

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  • Method for preparing porous carbon nanosheet through pyrolysis of two-dimensional covalent organic framework
  • Method for preparing porous carbon nanosheet through pyrolysis of two-dimensional covalent organic framework
  • Method for preparing porous carbon nanosheet through pyrolysis of two-dimensional covalent organic framework

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Embodiment 1

[0029] Embodiment 1: The method for preparing porous carbon nanosheets by pyrolysis of a two-dimensional covalent organic framework in this embodiment is carried out according to the following steps:

[0030] 1. Preparation of polymer: Weigh 2.23g (16mmol) of terephthalaldehyde and 2g (10.8mmol) of diaminodiphenyl ether and mix evenly, then add to 30mL of N,N-dimethylformamide (DMF ) and 30mL of N-methylpyrrolidone (NMP) in a mixed solvent, ultrasonically mixed for 15 minutes and then stirred for 15 minutes, under the protection of nitrogen, the oil bath was heated to 85°C to keep the reaction for 3 days, vacuum filtered, and After the solid phase was dried in vacuum at 80°C for 12 hours, the polymer DBEA was obtained, denoted as COF;

[0031] 2. Annealing: Put the polymer DBEA prepared in step 1 into a tube furnace, heat to 700, 800, 900, and 1000°C under nitrogen atmosphere, and keep it for 2 hours, then cool down to obtain porous carbon nanosheets, respectively record For ...

Embodiment 2

[0039] Embodiment 2: The method for preparing porous carbon nanosheets by pyrolysis of a two-dimensional covalent organic framework in this embodiment is carried out according to the following steps:

[0040] 1. Preparation of polymer: Weigh 2.23g (16mmol) of terephthalaldehyde and 1.16g (10.8mmol) of p-phenylenediamine and mix evenly, then add to 30mL of N,N-dimethylformamide (DMF ) and 30 mL of N-methylpyrrolidone (NMP), ultrasonically mixed for 15 minutes and then stirred for 15 minutes, under the protection of nitrogen, the oil bath was heated to 85 ° C to keep the reaction for 3 days, vacuum filtered, solidified After the phase was dried in vacuum at 80°C for 12 hours, the polymer DBDB was obtained;

[0041] 2. Annealing: Put the polymer DBDB prepared in step 1 into a tube furnace, heat to 900°C under nitrogen atmosphere and keep it for 2 hours, then cool down to obtain porous carbon nanosheets, which are designated as COF-900.

[0042] The scanning electron micrograph o...

Embodiment 3

[0043] Embodiment 3: The method for preparing porous carbon nanosheets by using two-dimensional covalent organic framework pyrolysis in this embodiment is carried out according to the following steps:

[0044] 1. Preparation of polymer: Weigh 1.5g (16mmol) of paraformaldehyde and 2g (10.8mmol) of diaminodiphenyl ether and mix evenly, then add to 30mL of N,N-dimethylformamide (DMF) Mixed with 30mL of N-methylpyrrolidone (NMP) in a mixed solvent, ultrasonically mixed for 15 minutes and then stirred for 15 minutes, under the protection of nitrogen, the oil bath was heated to 85 ° C to keep the reaction for 3 days, vacuum filtered, and in After vacuum drying at 80°C for 12 hours, the polymer DJEA was obtained;

[0045] 2. Annealing: put the polymer DJEA prepared in step 1 into a tube furnace, heat it to 900° C. under a nitrogen atmosphere and keep it for 2 hours, then cool down to obtain porous carbon nanosheets, which are designated as COF-900.

[0046] The scanning electron mic...

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Abstract

The invention discloses a method for preparing a porous carbon nanosheet by pyrolysis of a two-dimensional covalent organic framework, and relates to a method for preparing the porous carbon nanosheet. The invention aims to solve the technical problem that a porous carbon material prepared from COF in the prior art is low in specific capacitance. The method comprises the following steps of: reacting an aldehyde reactant with an amine reactant under the protection of nitrogen to obtain a polymer; and putting the polymer into a tubular furnace, and heating in a nitrogen atmosphere to obtain the porous carbon nanosheet. The specific surface area of the porous carbon nanosheet prepared by the method disclosed by the invention reaches 300.847 m < 2 > g <-1 > to 1496.588 m < 2 > g <-1 >, and the pore diameter of the porous carbon nanosheet is 3.132 nm to 3.713 nm. The specific capacitance of an electrode prepared from the porous carbon nanosheet is 500-630F g <-1 >, the impedance is 0.8-2.7 ohm, and the porous carbon nanosheet can be used in the field of electrochemistry.

Description

technical field [0001] The present invention relates to methods of porous carbon nanosheets. Background technique [0002] Covalent organic compounds (COF) are usually composed of covalent bonds between C, B, O, N and other elements. In theory, due to their long-range ordered skeleton, nanoporous structure and huge π-conjugated system, they can provide electronic Transmission provides a very good path, so that it can be well used in the preparation of optoelectronic devices, semiconductors, automobiles, electronic equipment, etc. Among them, carbonization of covalent organic compounds can be used to prepare porous carbon materials with high specific surface area, high thermal stability and uniform pore size distribution. For example, the Chinese patent with publication number CN107720720A discloses a method for preparing porous carbon based on covalent organic framework materials. The method utilizes COF-300, COF-320, COF-366, TPB-DMTP-COF, DhaTph-COF, TpPa-1-COF, IL COF-1,...

Claims

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Application Information

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IPC IPC(8): C01B32/15H01G11/44H01G11/26H01G11/24
CPCC01B32/15H01G11/26H01G11/24H01G11/44
Inventor 姜再兴张伟张仁杰董继东马丽娜井晶高国林李冰黄玉东
Owner HARBIN INST OF TECH
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