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Method for preparing high-specific-surface-area graphene under conditions of normal pressure and low temperature

A technology with high specific surface area and low temperature conditions, applied in the field of graphene, can solve the problems of difficulty in graphene collection, unsuitable large-scale production, and high production costs, achieve broad market application prospects, overcome the limitations of vacuum or low pressure conditions, and promote peeling. Effect

Active Publication Date: 2012-04-25
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the auxiliary effect of vacuum or low-pressure environment reduces the expansion temperature of graphite oxide on the one hand, but on the other hand, because graphene is a fluffy fluffy substance with low density, vacuum or low-pressure conditions cause difficulty in the collection of graphene, and also There is a problem that the production cost is high and it is not suitable for mass production

Method used

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  • Method for preparing high-specific-surface-area graphene under conditions of normal pressure and low temperature
  • Method for preparing high-specific-surface-area graphene under conditions of normal pressure and low temperature

Examples

Experimental program
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Embodiment 1

[0020] Step 1: The reaction vessel is placed in an ice-water bath. Before the reaction begins, high-purity nitrogen gas is used to remove the air in the vessel; then 90ml of concentrated nitric acid and 175ml of concentrated sulfuric acid are added, and stirred evenly to obtain a mixed acid solution; after the mixed acid solution is cooled, 10g of graphite is added, Stir evenly, then slowly add 110g potassium chlorate powder, react for 120 hours; After the reaction finishes, the solid intermediate product obtained is washed with a large amount of deionized water to remove residual sulfate ions, and then neutralized with 1% aqueous sodium hydroxide solution, Adjust the pH of the mixed solution to 7 to obtain a neutral solution of graphite oxide.

[0021] Step 2: adding an aqueous solution of hydrochloric acid to the neutral solution of graphite oxide to adjust the pH value of the mixed solution to 0, then filtering the mixed solution, and drying at 80° C. to obtain acidified gra...

Embodiment 2

[0037]This embodiment is basically the same as Embodiment 1, the difference is:

[0038] In step 2, an aqueous solution of hydrochloric acid is added to adjust the pH value of the mixed solution to 1;

[0039] In step 3, the acidified graphite oxide was put into a beaker preheated to 160° C. in atmospheric air and kept for 10 minutes.

[0040] Other operations are exactly the same as in Example 1.

[0041] The acidified graphite oxide undergoes expansion and exfoliation under this condition to obtain a fluffy and fluffy graphene material. The test of nitrogen adsorption and desorption method shows that the specific surface area of ​​the prepared graphene is 720m 2 / g.

Embodiment 3

[0043] This embodiment is basically the same as Embodiment 1, the difference is:

[0044] In step 2, an aqueous solution of hydrochloric acid is added to adjust the pH value of the mixed solution to 2;

[0045] In step 3, the acidified graphite oxide was put into a beaker preheated to 140° C. in atmospheric air and kept for 30 minutes.

[0046] Other operations are exactly the same as in Example 1.

[0047] The acidified graphite oxide undergoes expansion and exfoliation under this condition to obtain a fluffy and fluffy graphene material. The test of nitrogen adsorption and desorption method shows that the specific surface area of ​​the prepared graphene is 654m 2 / g.

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Abstract

The invention discloses a method for preparing graphene under the conditions of normal pressure and low temperature, which comprises the following steps that: firstly, volatile acid is used for treating graphite oxide so that volatile acid molecules are adsorbed between sheet layers of the graphite oxide, acidized graphite oxide is obtained, then, a heat treatment expansion method is adopted for preparing the graphene, experiments prove that the acidized graphite oxide generates a large amount of acid gas in the heat expansion process, and the peeling of the graphite oxide is prompted, so thegraphite oxide can generate the expansion peeling in the normal-pressure and low-temperature atmosphere, the graphene can be obtained, and in addition, the obtained graphene has high specific surfacearea. Therefore, the preparation method provided by the invention is simple, is easy to implement and overcomes the defect of vacuum or low-pressure condition limitation required during the graphene preparation in the prior art, the assurance is provided for the large-scale production of the graphene, and wide market application prospects are realized.

Description

technical field [0001] The invention relates to the technical field of graphene, in particular to a method for preparing graphene with a high specific surface area by a thermal expansion method under normal pressure and low temperature conditions. Background technique [0002] Graphene is an emerging carbon material with a special two-dimensional structure in recent years. Excellent thermal, mechanical and electrical properties, as well as ultra-high aspect ratio and specific surface area make graphene have broad potential application prospects in many fields such as electronic devices, microwave absorption, and conductive plastics. How to prepare graphite at low cost and on a large scale Oxygen nanocarbon materials are one of the focuses of researchers at present. [0003] The disclosed graphene preparation methods include chemical methods, such as documents: STANKOVICH S, DIKIN D A, DOMMETT G H B, et al.Nature, 2006,442,282; mechanical exfoliation methods, such as documen...

Claims

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Application Information

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IPC IPC(8): C01B31/04B82Y40/00
Inventor 郑文革卢叮叮翟文涛陈操
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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