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Preparation method of boron doped graphene

A technology of graphene and boron doping, applied in the direction of graphene, nano-carbon, etc., can solve the problem of low boron content in boron-doped graphene

Inactive Publication Date: 2014-05-14
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Application Information

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Problems solved by technology

At present, the method of preparing boron-doped graphene generally adopts high-temperature thermal doping method, and the problem with this method is that the boron-doped graphene prepared has a low boron content.

Method used

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  • Preparation method of boron doped graphene

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preparation example Construction

[0028] see figure 1 , the preparation method of the boron-doped graphene of an embodiment comprises the following steps:

[0029] S101, oxidize the graphite to obtain graphite oxide.

[0030] The specific steps are: add graphite to the mixed solution of concentrated sulfuric acid and concentrated nitric acid, stir in an ice-water mixing bath while keeping the temperature at about 0°C; then slowly add potassium permanganate to the mixed solution In the process, because potassium permanganate has strong oxidizing properties under acidic conditions, graphite can be oxidized; then the mixed solution is heated to 85°C for reaction and kept for 30 minutes. During the heat preservation process, graphite can be further oxidized ; Add deionized water, continue to maintain 85 ° C temperature for 30 minutes; then add hydrogen peroxide to the mixed solution, remove excessive potassium permanganate, obtain graphite oxide solution; graphite oxide solution is suction filtered to obtain a so...

Embodiment 1

[0043] (1) Preparation of graphite oxide: Weigh 1 g of graphite with a purity of 99.5%, add 90 mL of concentrated sulfuric acid with a mass fraction of 98% and 25 mL of concentrated nitric acid with a mass fraction of 65%, and place the mixed solution in Stir in an ice-water mixed bath for 20 minutes; then slowly add 6g of potassium permanganate to the mixed solution and stir for 1 hour; then heat the mixed solution to 85°C and keep it for 30 minutes; then add 92mL of deionized water Continue to keep at 85°C for 30 minutes; then add 10mL hydrogen peroxide solution with a mass fraction of 30%, and stir for 10 minutes; filter the mixed solution with suction, and then use 100mL dilute hydrochloric acid and 150mL deionized water to treat the solids successively. Washing, a total of three washings, one of the washing process is to first place the solid in dilute hydrochloric acid, suction filtration, after the filtrate is drained, pour it into deionized water for suction filtration....

Embodiment 2

[0048] (1) Preparation of graphite oxide: Weigh 1 g of graphite with a purity of 99.5%, add 90 mL of concentrated sulfuric acid with a mass fraction of 98% and 25 mL of concentrated nitric acid with a mass fraction of 65%, and place the mixed solution in Stir in an ice-water mixed bath for 20 minutes; then slowly add 6g of potassium permanganate to the mixed solution and stir for 1 hour; then heat the mixed solution to 85°C and keep it for 30 minutes; then add 92mL of deionized water Continue to keep at 85°C for 30 minutes; finally add 10mL hydrogen peroxide solution with a mass fraction of 30%, and stir for 10 minutes; filter the mixed solution with suction, and then use 100mL dilute hydrochloric acid and 150mL deionized water to treat the solids successively. Washing, washing three times in total, finally the solid was dried in a vacuum oven at 60° C. for 12 hours to obtain graphite oxide.

[0049] (2) Preparation of graphene oxide: disperse the graphite oxide obtained in (1...

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Abstract

A preparation method of boron doped graphene comprises the steps of: oxidizing graphite to obtain the graphite oxide; dispersing the graphite oxide in deionized water, conducting ultrasonic treatment for 1-3 h, filtering and drying to obtain the graphene oxide; mixing the graphene oxide with potassium hydroxide, placing the mixture in an inert gas atmosphere, heating to 800-1000 DEG C, insulating for 1-2 h, and cooling to room temperature to obtain a first mixture; removing oxides of potassium, washing and drying to obtain graphene; mixing the graphene with boron trioxide, placing the mixture in an inert gas atmosphere, heating to 800-1300 DEG C, insulating for 0.5-3 h and cooling to room temperature to obtain a second mixture; and removing residual boron trioxide, washing and drying to obtain boron doped graphene. By adopting the preparation method, boron doped graphene with high boron content can be obtained.

Description

technical field [0001] The invention relates to the field of graphene composite materials, in particular to a preparation method of boron-doped graphene. Background technique [0002] Graphene as a new type of carbon material, since its discovery in 2004, due to its two-dimensional monolayer structure and excellent physical properties, such as high theoretical specific surface area, excellent mechanical strength, good flexibility and high electrical conductivity Efficiency, etc., have brought great changes to materials in fields such as energy. [0003] Because graphene is very easy to derivatize, its derivatives have also attracted extensive attention from researchers. At present, graphene derivatives mainly include nitrogen-doped graphene and boron-doped graphene. Among them, in boron-doped graphene, because the boron atom has one electron less than the outer layer of the carbon atom, it is P-type doped, which has better energy storage performance than graphene, and the b...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/19
Inventor 周明杰钟辉王要兵袁新生
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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