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Method for preparing boron or boron-nitrogen doped graphene

A graphene and boron-nitrogen technology, which is applied in the field of preparation of boron-doped or boron-nitrogen graphene, can solve the problems of high equipment requirements and complicated operation, and achieve the effects of large effective specific surface area, simple preparation process, and simple and convenient operation

Active Publication Date: 2015-08-26
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of high requirements and complex operation of existing boron-doped and / or nitrogen-doped graphene preparation equipment, the present invention aims to provide a method for preparing boron-doped or boron-nitrogen graphene, which involves doping boron or boron-nitrogen elements into In the graphene sheet, boron or boron nitrogen graphene is prepared

Method used

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specific Embodiment approach 1

[0040] (1) Weigh 11.4% boric acid by mass percentage, dissolve it in ethanol solution, then weigh 33.2% magnesium powder and 55.4% calcium carbonate by mass percentage, mix with boric acid solution, and quickly dissolve ethanol under vacuum condition at 90 degrees Celsius Evaporation gave a mixed powder.

[0041] (2) Grinding the powder obtained in step (1) to make the particles fine and mix evenly;

[0042] (3) The mixed powder obtained in step (2) is subjected to a combustion synthesis reaction, and the specific steps are as follows:

[0043] a. Put 100g of mixed powder in a 1L crucible, and add igniter Fe above the mixed powder 3 o 4 + Al;

[0044] b. Then put the crucible into a 20L stainless steel combustion synthesis reactor, and evacuate the interior of the combustion synthesis reaction device;

[0045] C, pass into carbon dioxide in the stainless steel combustion synthesis reactor, make the interior of crucible and stainless steel combustion synthesis reactor be fu...

specific Embodiment approach 2

[0050] (1) Weigh 20% of phenylboronic acid, 30% of magnesium powder and 50% of calcium carbonate by mass percentage to obtain a mixed powder.

[0051] (2) Grinding the powder obtained in step (1) to make the particles fine and mix evenly;

[0052] (3) The mixed powder obtained in step (2) is subjected to a combustion synthesis reaction, and the specific steps are as follows:

[0053] a. Put 1000g of mixed powder in a 10L crucible, and add igniter MnO above the mixed powder 2 +Mg;

[0054] b. Then put the crucible into a 100L stainless steel combustion synthesis reactor, and evacuate the interior of the combustion synthesis reaction device;

[0055] C, pass into carbon dioxide gas in the stainless steel combustion synthesis reactor, make the interior of crucible and stainless steel combustion synthesis reactor be full of carbon dioxide gas;

[0056] d. Using local electric ignition, pass a 20 A DC current through the helical tungsten coil to ignite the igniter MnO 2 +Mg, ma...

specific Embodiment approach 3

[0059] (1) Weigh a mixture of 15% ammonium borate, 30% magnesium powder, and 45% calcium carbonate and magnesium carbonate by mass percentage to obtain a mixed powder.

[0060] (2) Grinding the powder obtained in step (1) to make the particles fine and mix evenly;

[0061] (3) The mixed powder obtained in step (2) is subjected to a combustion synthesis reaction, and the specific steps are as follows:

[0062] a. Put 100g of the mixed powder obtained in step 2 into a 1L crucible, and add the igniter Fe above the mixed powder 3 o 4 +Al;

[0063] b. Then put the crucible into a 20L stainless steel combustion synthesis reactor, and evacuate the interior of the combustion synthesis reaction device;

[0064] C, pass into carbon dioxide in the stainless steel combustion synthesis reactor, make the interior of crucible and stainless steel combustion synthesis reactor be full of carbon dioxide;

[0065] d. Use high-frequency induction ignition to ignite the igniter Fe 3 o 4 +Al, ...

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Abstract

The invention provides a method for preparing boron or boron-nitrogen doped graphene. The method comprises steps as follows: (1), magnesium powder, a solid carbon source and a boron or boron-nitrogen source which are well weighed are uniformly mixed, mixed powder is obtained, and the mass ratio of the magnesium powder, the solid carbon source and the boron or boron-nitrogen source in the mixed powder is (19.95-99):(40-79.95):(1-39.5); (2), the mixed powder obtained in the step (1) is subjected to a combustion synthesis reaction in a specific atmosphere, and boron or boron-nitrogen doped grapheme is obtained after a reaction product is purified. A substance containing boron or boron-nitrogen is adopted and serves as the boron or boron-nitrogen source, preparation and doping of the graphene are finished in one step, and the prepared boron or boron-nitrogen doped graphene has a complete laminated structure, good dispersion, high quality and a large effective specific surface area and has wide application prospects in nanocomposite materials, energy storage devices, catalysts and ferromagnetic devices.

Description

technical field [0001] The invention belongs to the technical field of carbon materials, and relates to a preparation method of boron-doped or boron-nitrogen graphene. Background technique [0002] Graphene is a new type of carbon material with a single-layer sheet structure composed of carbon atoms. It has excellent physical, chemical and mechanical properties and is widely used in chemical power sources, optoelectronic devices and heterogeneous catalysis. [0003] However, since graphene has no energy band gap, its conductivity cannot be fully controlled like traditional semiconductors, and the surface of graphene is smooth and inert, which is not conducive to the recombination with other materials, thus hindering the application of graphene. Doping graphene with boron or boron nitrogen can open the energy band gap and adjust the conductivity type, change the electronic structure of graphene, increase the hole carrier density of graphene, and thus improve the stability of ...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 王黎东费维栋刘兆远苗卿华
Owner HARBIN INST OF TECH
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