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A kind of activated graphene, its preparation method and its application

A graphene and graphene powder technology, applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve problems such as low utilization rate, and achieve the effects of low cost, low environmental pollution, and easy industrial production

Active Publication Date: 2015-10-07
THE SIXTH ELEMENT CHANGZHOU MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] CN102496475A (published on June 13, 2012) discloses the use of CN102070140A (that is, the method of preparing graphene with a strong base as an activator) to prepare a graphene with a specific surface area greater than 2600m 2 / g of active graphene, but its mass specific capacitance is only 150F / g when it is applied to supercapacitor electrode materials
The utilization rate of the mesoporous graphene with the pore diameter of most of the pores above 2nm will also be greatly improved when it is applied to the supercapacitor electrode material, breaking the current active graphene. Although the specific surface area is large, the utilization rate lower status

Method used

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  • A kind of activated graphene, its preparation method and its application
  • A kind of activated graphene, its preparation method and its application
  • A kind of activated graphene, its preparation method and its application

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Experimental program
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Effect test

Embodiment 1

[0051] A kind of preparation method of activated graphene comprises the steps:

[0052] (1) heat treatment to prepare graphene powder;

[0053] (2) Weigh the graphene powder prepared in step (1) into a corundum crucible, and place the crucible in the middle of the tube of the tubular heating furnace;

[0054] (3) Check the airtightness of the device;

[0055] (4) Introduce nitrogen to remove the air in the heating device, heat the reaction furnace to 800 °C at a heating rate of 10 °C / min, and then introduce preheated CO 2 gas (CO 2 temperature is 200°C), CO 2 The gas flow rate is 200mL / min and the nitrogen gas is cut off at the same time;

[0056] (5) After activation for 400min, cut off CO 2 gas, feed nitrogen, and allow the reaction furnace to cool down to room temperature naturally to obtain activated graphene.

[0057] The device of activated graphene described in the present embodiment is as image 3 shown.

[0058] The specific surface area of ​​the activated gra...

Embodiment 2

[0063] A kind of preparation method of activated graphene comprises the steps:

[0064] (1) Weigh the heat-treated graphene powder and place it in a nickel crucible, and place the crucible in the middle of the tube of the tube heating furnace;

[0065] (2) Check the airtightness of the device;

[0066] (3) Introduce nitrogen to remove the air in the heating device, then heat the reaction furnace to 1200 °C at a heating rate of 30 °C / min, and then inject preheated CO 2 gas (CO 2 temperature is 200°C), CO 2 The gas flow rate is 500mL / min, and the nitrogen gas is cut off at the same time;

[0067] (4) After activation for 200min, cut off CO 2 Gas, feed nitrogen, and make the reaction furnace naturally cool to room temperature to obtain activated graphene;

[0068] The specific surface area of ​​the activated graphene is 1860m 2 / g, the specific capacitance is 135F / g, and the mesopores with a pore diameter of 3-6nm account for 78% of the number of open pores.

Embodiment 3

[0070] A kind of preparation method of activated graphene comprises the steps:

[0071] (1) Preparation of graphene powder by microwave irradiation;

[0072] (2) Weighing the graphene powder prepared in step (1) and placing it in a ceramic crucible, and placing the crucible in the middle of the tube of the tubular heating furnace;

[0073] (3) Check the airtightness of the device;

[0074] (4) Introduce helium to remove the air in the heating device, then heat the reactor to 1500 °C at a heating rate of 40 °C / min, and then inject preheated CO 2 gas (CO 2 temperature is 400°C), CO 2 The gas flow rate is 600mL / min, and the nitrogen gas is cut off at the same time;

[0075] (5) After activation for 80 minutes, cut off CO 2 Gas, feed nitrogen, and make the reaction furnace naturally cool to room temperature to obtain activated graphene;

[0076] The specific surface area of ​​the activated graphene is 1500m 2 / g, the specific capacitance is 125F / g, and the mesopores with a ...

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Abstract

The invention relates to activated graphene and a preparation method and the usage thereof. The preparation method of the activated graphene includes: heating graphene powder in a shielding atmosphere, feeding carbon dioxide gas for activation, and cooling to the room temperature after activation is completed to obtain mesoporous graphene. 80% of pores of the activated graphene are mesopores with the diameter ranging from 3nm to 6nm, the pore utilization rate is high in a supercapacitor electrode material, the specific capacitance of the supercapacitor electrode material is up to 150F / g, the specific surface area is about 1500-2200m<2> / g, and the activated graphene is rich in mesopores and high in specific surface area. The method is simple in operation, low in cost, low in environment pollution and easy for industrial production.

Description

technical field [0001] The invention relates to an activated graphene, its preparation method and application, in particular to a method for preparing activated graphene by activating graphene with carbon dioxide gas, which belongs to the technical field of graphene material preparation. Background technique [0002] Graphene is a sp 2 Hexagonal honeycomb-shaped two-dimensional nanomaterials composed of hybrid carbon atoms. Compared with expensive fullerenes and carbon nanotubes, graphene oxide (GO, Graphene Oxide) is cheap and easy to get raw materials. Graphene has a high specific surface area (theoretical specific surface area is as high as 2630m 2 / g) and high conductivity (resistivity about 10 -6 Ω cm), thus making graphene-based materials extremely promising active materials for energy storage, especially as electrode materials for electric double layer supercapacitors. [0003] A super capacitor (SC for short) combines the technical characteristics of ordinary phy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04C01B32/194
CPCY02P20/141
Inventor 蔡燕李永锋
Owner THE SIXTH ELEMENT CHANGZHOU MATERIALS TECH