Nitrogen plasma modified three-dimensional graphene powder, and preparation and application of graphene powder

A plasma, graphene powder technology, applied in electrical components, photosensitive equipment, inorganic chemistry, etc., can solve the problems of large electrode thickness, unfavorable battery packaging and practical application, increase battery cost, etc., achieve excellent electrical conductivity, achieve large Batch preparation, strong universal effect

Active Publication Date: 2017-05-31
江苏华永烯科技有限公司
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  • Abstract
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Problems solved by technology

[0002] Three-dimensional graphene powder has good electrical conductivity, large specific surface area, low cost and electrocatalytic activity to a certain extent, it is considered to be an ideal material for the counter electrode of dye-sensitized solar cells, but if it wants to provide Better catalytic activity requires a larger thickness of the counter electrode, which is not conducive to the subsequent packaging and practical application of the battery, and will increase the cost of the battery. Therefore, it is necessary to modify the graphene powder to enhance the catalytic ability of graphene

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  • Nitrogen plasma modified three-dimensional graphene powder, and preparation and application of graphene powder
  • Nitrogen plasma modified three-dimensional graphene powder, and preparation and application of graphene powder
  • Nitrogen plasma modified three-dimensional graphene powder, and preparation and application of graphene powder

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Effect test

Embodiment 1

[0049] This embodiment provides a method for growing a three-dimensional graphene powder with a large specific surface area by using a vertical fluidized bed vapor-phase chemical deposition method, which includes the following steps:

[0050] Under normal pressure, feed Ar (1000 sccm / min), raise the temperature of the heating furnace in the fluidized bed to 950 ° C, and the heating rate is 5 ° C / min; after reaching the reaction temperature, feed CH 4 Gas (800sccm / min);

[0051] At the same time, add 20g of magnesium oxide template from the top of the fluidized bed, and the reaction time is 20min;

[0052] After reaching the reaction time, stop feeding CH 4 gas, stop heating and cool to room temperature naturally. Open the furnace, take out the black product, pickle and purify to remove the template, filter it, put it in a vacuum oven and dry it at 50°C for 10 hours to completely remove water; thus obtain a large specific surface area three-dimensional graphene powder raw mat...

Embodiment 2

[0056] The present embodiment provides a kind of preparation method of three-dimensional graphene powder modified by nitrogen plasma, which comprises the following steps:

[0057] (1), the three-dimensional graphene powder with large specific surface area prepared in Example 1 is placed in a vacuum oven and dried at 40° C. for 2 hours to completely remove moisture;

[0058] (2), place the three-dimensional graphene powder with large specific surface area after drying in the plasma equipment (the schematic diagram is as follows Figure 15 (shown) on the bottom electrode in the chamber, adjust the top electrode so that the distance between the bottom electrode and the top electrode is 6 mm, then use a vacuum pump to first drain the air in the chamber, then pass nitrogen to normal pressure, and then pump the nitrogen Dry, and finally feed nitrogen with a flow rate of 170sccm / min until the pressure in the chamber is 470Pa;

[0059] (3) After the pressure in the chamber of the pla...

Embodiment 3

[0062] The present embodiment provides a kind of preparation method of three-dimensional graphene powder modified by nitrogen plasma, which comprises the following steps:

[0063] (1), the three-dimensional graphene powder with large specific surface area prepared in Example 1 is placed in a vacuum oven and dried at 40° C. for 2 hours to completely remove moisture;

[0064] (2), place the dried large specific surface area three-dimensional graphene powder on the bottom electrode in the chamber of the plasma equipment, adjust the top electrode so that the distance between the bottom electrode and the top electrode is 6 mm, and then use a vacuum pump to first The air in the chamber is drained, then nitrogen is introduced to normal pressure, then the nitrogen is drained, and finally nitrogen is introduced at a flow rate of 170 sccm / min until the pressure in the chamber is 470Pa;

[0065] (3) After the pressure in the chamber of the plasma equipment is stabilized, turn on the high...

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Abstract

The invention provides nitrogen plasma modified three-dimensional graphene powder, and a preparation method and an application of the graphene powder. The preparation method comprises the following steps that (1) dried three-dimensional graphene powder with a large specific surface area is placed on a bottom electrode in a chamber of plasma equipment; a top electrode is adjusted to allow that an appropriate spacing is kept between the bottom electrode and the top electrode; air in the chamber is removed; and nitrogen is supplied to the chamber; and (2) after the pressure in the chamber of the plasma equipment is stable, a high voltage direct current power supply is opened to stably generate a nitrogen plasma atmosphere; and nitrogen plasma modification treatment of the three-dimensional graphene powder is performed in the atmosphere to obtain the nitrogen plasma modified three-dimensional graphene powder. The nitrogen plasma modified three-dimensional graphene powder prepared by the method serves as a counter electrode material for assembling a dye-sensitized solar cell, and further replaces the traditional electrode material Pt, so that the photovoltaic efficiency of the cell can be obviously improved, and the production cost of the cell can be lowered.

Description

technical field [0001] The invention relates to a three-dimensional graphene powder modified by nitrogen plasma and its preparation and application, and belongs to the technical field of graphene materials and its preparation and application. Background technique [0002] Three-dimensional graphene powder has good conductivity, large specific surface area, low cost and electrocatalytic activity to a certain extent, it is considered to be an ideal material for the counter electrode of dye-sensitized solar cells, but if it wants to provide Better catalytic activity requires a larger thickness of the counter electrode, which is not conducive to the subsequent packaging and practical application of the battery, and will increase the cost of the battery. Therefore, it is necessary to modify the graphene powder to enhance the catalytic ability of graphene. [0003] Therefore, providing a three-dimensional graphene powder modified by nitrogen plasma has become an urgent technical p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/194H01G9/20H01G9/042
Inventor 李永峰杨旺杨帆
Owner 江苏华永烯科技有限公司
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