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Method for preparing nitrogen-doped graphene and nickel sulfide quantum dot nanometer composite material

A technology of nitrogen-doped graphene and nanocomposite materials, which is applied in the direction of nanotechnology, nanotechnology, metal material coating technology, etc., can solve the problems of failure to achieve material compounding and failure to introduce second phase components, and achieve The effect of cheap experimental equipment, high yield, and controllable reaction conditions

Inactive Publication Date: 2016-02-03
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the carbon source used in this technology is citric acid, and the final product is functionalized graphene quantum dots, which failed to introduce the second phase components and failed to realize the recombination of materials.

Method used

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  • Method for preparing nitrogen-doped graphene and nickel sulfide quantum dot nanometer composite material
  • Method for preparing nitrogen-doped graphene and nickel sulfide quantum dot nanometer composite material
  • Method for preparing nitrogen-doped graphene and nickel sulfide quantum dot nanometer composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment includes the following steps:

[0029] 1) adopt Hummers method to prepare graphene oxide powder;

[0030] 2) 3 mmol of nickel nitrate hexahydrate, namely N i (NO 3 ) 2 ·6H 2 O and 3 mmol of L-cysteine ​​were dissolved in 75 mL of H 2 O, then add 5 mL of NH 3 ·H 2 O (20wt%), stirred for 45 minutes, added the graphene oxide powder obtained in 140mg step 1 to the above solution, further stirred and ultrasonicated for 45 minutes;

[0031] 3) Add the product obtained in step 2 to the reaction kettle, heat-treat at 160°C for 12 hours, centrifuge the obtained product, wash it repeatedly with deionized water and absolute ethanol three times, and dry it in a drying oven at 60°C to obtain nitrogen-doped Graphene and nickel sulfide quantum dot nanocomposites.

[0032] Such as figure 1 and figure 2 As shown, it is a TEM image of the composite material obtained in this embodiment, and it can be seen that the nickel sulfide quantum dots are very uniformly d...

Embodiment 2

[0035] This embodiment includes the following steps:

[0036] 1) adopt Hummers method to prepare graphene oxide powder;

[0037] 2) 2 mmol of nickel nitrate hexahydrate, namely N i (NO 3 ) 2 ·6H 2 O and 2 mmol of L-cysteine ​​were dissolved in 75 mL of H 2 O, then add 5 mL of NH 3 ·H 2 O (20wt%), stirred for 45 minutes, added 120mg graphene oxide powder in the above solution, stirred and ultrasonicated for 45 minutes;

[0038] 3) Put the product obtained in step 2 into the reaction kettle, heat-treat at 170°C for 12 hours, centrifuge the obtained product, wash it repeatedly with deionized water and absolute ethanol three times, and dry it in a drying oven at 60°C to obtain nitrogen-doped Graphene and nickel sulfide quantum dot nanocomposites.

[0039] Compared with the product prepared in Example 1, the electrical conductivity of the composite material is slightly lower.

Embodiment 3

[0041] This embodiment includes the following steps:

[0042] 1) adopt Hummers method to prepare graphene oxide powder;

[0043] 2) 3 mmol of nickel nitrate hexahydrate, namely N i (NO 3 ) 2 ·6H 2 O and 4 mmol of L-cysteine ​​were dissolved in 75 mL of H 2 O, then add 6 mL of NH 3 ·H 2 O (20wt%), stirred for 45 minutes, added 120mg graphene oxide powder in the above solution, stirred and ultrasonicated for 45 minutes;

[0044]3) The product obtained in step 2 was added to the reaction kettle, heat-treated at 180°C for 8 hours, the obtained product was centrifuged, washed repeatedly with deionized water and absolute ethanol for 3 times, and dried in a drying oven at 60°C to obtain nitrogen-doped Graphene and nickel sulfide quantum dot nanocomposites.

[0045] Compared with the product prepared in Example 1, the nickel sulfide quantum dots are more uniformly distributed on the nitrogen-doped graphene sheet in the product prepared in this example.

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Abstract

The invention discloses a method for preparing a nitrogen-doped graphene and nickel sulfide quantum dot nanometer composite material; the nitrogen-doped graphene and nickel sulfide quantum dot nanometer composite material consists of nitrogen-doped graphene and nickel sulfide quantum dots; oxidized graphene powder is prepared through a hummers method; ammonia water serves as a nitrogen source; nickel salt is added as a nickel source; L-cysteine serves as a sulfur source; the oxidized graphene powder is added in the solution for stirring and ultrasonic processing to uniformly mix the solution; the solution is transferred into a hydrothermal reaction kettle for sealing; through a hydrothermal chemical reaction, on the one hand, the graphene is converted to the nitrogen-doped graphene through the effect of ammonia; and on the other hand, the nickel salt and the L-cysteine are reacted to generate the nickel sulfide quantum dots for uniform growing on the nitrogen-doped graphene. The nickel sulfide quantum dots are successfully synthesized through a hydrothermal method, and are uniformly compounded with the nitrogen-doped graphene; and meanwhile, the nitrogen-doped graphene and nickel sulfide quantum dot nanometer composite material is high in electric conductivity, high catalysis and high stability, and can be widely applied to supercapacitor electrode materials, the photo, electric and chemical catalysis and electrodes of solar batteries and new energy batteries.

Description

technical field [0001] The invention relates to nanotechnology in the field of new energy materials, in particular to a method for preparing nitrogen-doped graphene and nickel sulfide quantum dot nanocomposite materials. Background technique [0002] Nanocomposites can concentrate the excellent properties of individual materials. Based on this idea, the rational design of the structure and morphology of materials has an important impact on the performance and application of nanomaterials. More importantly, the uniform distribution of nanomaterials is important for other materials. It is of great significance in the fields of energy environment, such as supercapacitors, solar cells, photocatalysis, etc., so the control and synthesis of nanocomposites are getting more and more attention. [0003] Metal sulfides (Ni, Co, Fe, etc.) have attracted interest due to their good catalytic and reactive properties. This type of material has more diverse physical properties, such as cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/32H01G11/30H01M4/36B82Y30/00
CPCY02E60/10Y02E60/13
Inventor 冀浩金军陈汉毕恩兵杨旭东韩礼元
Owner SHANGHAI JIAO TONG UNIV
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