Fluorinated graphene with large surface area and high thermal stability and preparation method thereof

A technology of fluorinated graphene and high thermal stability, which is applied in the direction of graphene, chemical instruments and methods, carbon fluoride, etc., can solve the problems of low thermal stability and low real specific surface area of ​​fluorinated graphene, and achieve specific surface area Improvement, easy thermal stability, and the effect of reducing energy consumption

Active Publication Date: 2017-05-17
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, due to the characteristics of the two-dimensional nanosheet structure, fluorinated graphene also has the problem of other two-dimensional nanomaterials such as graphene, that is, the stacking between sheets leads to the real specific surface area o

Method used

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  • Fluorinated graphene with large surface area and high thermal stability and preparation method thereof
  • Fluorinated graphene with large surface area and high thermal stability and preparation method thereof

Examples

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Example Embodiment

[0029] Example 1

[0030] The graphene and potassium hydroxide are mixed uniformly at a ratio of 1:4, and then the mixture is treated at 600°C for 5 hours under a nitrogen atmosphere to obtain activated graphene; the activated graphene is placed in a closed vacuum reactor, and the reactor is replaced with nitrogen The air in the air is vacuumed three times, and then filled with a mixture of fluorine and nitrogen, and the initial partial pressure of the fluorine is controlled to 30KPa, and then the temperature is raised to 30°C at a heating rate of 3°C / min and kept for 60 minutes, and cooled naturally At room temperature, fluorinated graphene is obtained.

[0031] The fluorine content in the fluorinated graphene is 20%, and the specific surface area is 1800m 2 / g, the peak temperature of weight loss is 560℃.

Example Embodiment

[0032] Example 2

[0033] The graphene and potassium hydroxide are mixed uniformly at a ratio of 1:7, and then the mixture is treated at 800°C under a nitrogen atmosphere for 1 h to obtain activated graphene; the activated graphene is placed in a closed vacuum reactor and replaced with argon. The air in the device is evacuated three times and then filled with a mixture of fluorine and argon, and the initial partial pressure of fluorine is controlled to 40KPa, and then the temperature is raised to 150°C at a temperature rise rate of 10°C / min and kept for 150 minutes. Naturally cool to room temperature to obtain fluorinated graphene.

[0034] The fluorine content in the fluorinated graphene is 34%, and the specific surface area is 1600m 2 / g, the peak temperature of weight loss is 565℃.

Example Embodiment

[0035] Example 3

[0036] The graphene, magnesium citrate and potassium citrate were mixed uniformly at a ratio of 1:4:4, and then the mixture was treated at 800°C for 0.5h under nitrogen and argon atmosphere to obtain activated graphene; the activated graphene was placed in a sealed In the vacuum reactor, replace the air in the reactor with argon for three times, then evacuate, then fill with a mixture of fluorine and argon, and control the initial partial pressure of fluorine to 50KPa, and then increase the temperature at 10°C / min The rate is increased to 100°C and kept for 300 minutes, and then naturally cooled to room temperature to obtain fluorinated graphene.

[0037] The fluorine content in the fluorinated graphene is 43%, and the specific surface area is 1600m 2 / g, the peak temperature of weight loss is 575℃.

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Abstract

The invention discloses fluorinated graphene with large surface area and high thermal stability. Firstly, graphene or graphene oxide is mixed with an activator, and high-temperature activation treatment is carried out in an inert gas atmosphere to obtain activated graphene, then a fluorine mixed gas is taken as a fluorinating reagent to carry out direct fluorination on the activated graphene so as to obtain the fluorinated graphene, wherein fluoride atoms and carbon atoms are covalently bonded, the fluorine content is 10 to 70%, the weight loss peak temperature is greater than 550 DEG C, and the specific surface area is more than 1000m<2>/g. The fluorinated graphene is prepared by using a new method of firstly carrying out activation and then fluorination, the fluoridation activity of the activated graphene and fluorine is obviously improved, the fluorinated graphene of which the fluorine content is 20 to 50% can be further formed at low temperature, and the new method is higher in process safety and capable of lowering the energy consumption and production cost, thereby being suitable for mass production, and further being capable of obtaining the fluorinated graphene with the large surface area and high thermal stability.

Description

technical field [0001] The invention belongs to the technical field of graphene derivatives and their preparation, in particular to a fluorinated graphene with a large specific surface area and high thermal stability and a preparation method thereof. Background technique [0002] Graphene is a new type of two-dimensional nanomaterial that has been found to be the thinnest, hardest, and has many advantages such as the strongest electrical and thermal conductivity. Therefore, graphene and its derivatives have not only become one of the revolutionary new materials in the field of materials. First, and the effective modification of graphene to prepare its multifunctional derivatives has also become the focus of research in the field of graphene. At present, graphene derivatives mainly include graphene oxide, graphane, semihydrogenated graphene, hydroxyl-modified hydrated graphene, chlorinated graphene, and fluorinated graphene. Among these graphene derivatives, in addition to t...

Claims

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Application Information

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IPC IPC(8): C01B32/10C01B32/184
CPCC01B2204/24C01B2204/32C01P2004/04
Inventor 王旭刘向阳陈腾刘洋赖文川李玉龙
Owner SICHUAN UNIV
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