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Preparation method of porous folded graphene with high specific surface area

A high specific surface area, graphene technology, applied in the chemical industry, can solve the problems of low specific surface area and loss of wrinkled structure of porous wrinkled graphene, and achieve the effect of facilitating ultrasonic atomization treatment

Active Publication Date: 2018-05-15
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, directly activating the wrinkled graphene with a pore-forming agent, although a high specific surface area is obtained, it completely loses its wrinkled structure.
Porous wrinkled graphene can be prepared by spraying graphene oxide and pore-forming agents simultaneously, but the commonly used pore-forming agents are usually reducing and can partially reduce graphene oxide, thus changing the solvent water and graphite oxide in the spray-drying process. At the same time, the reduced graphene oxide will be partially stacked, and the specific surface area of ​​the prepared porous wrinkled graphene is relatively low, generally lower than 1000m 2 / g, therefore, the preparation of porous wrinkled graphene with high specific surface area is of great practical significance for broadening the practical application of graphene

Method used

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  • Preparation method of porous folded graphene with high specific surface area
  • Preparation method of porous folded graphene with high specific surface area
  • Preparation method of porous folded graphene with high specific surface area

Examples

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Embodiment 1

[0019] Take 400ml of 1mg / ml graphene oxide solution, first add 30ml of ammonia water with a concentration of 25% by mass, react at 30°C for 5h, then add sodium hydroxide, the mass ratio of sodium hydroxide to graphene oxide is 2:1, mix well , ultrasonic atomization treatment, the drying temperature is 500 ° C, the collected samples are heat-treated at 800 ° C for 1 hour under the protection of nitrogen, and washed until neutral. Finally, porous wrinkled graphene is obtained with a specific surface area of ​​1100m 2 / g. The morphology of porous and wrinkled graphene is as follows: figure 1 shown.

Embodiment 2

[0021] Take 200ml of 3mg / ml graphene oxide solution, first add 6g of anhydrous ethylenediamine, react at 80°C for 12h, then add potassium hydroxide, the mass ratio of potassium hydroxide to graphene oxide is 4:1, mix well, and ultrasonically Chemical treatment, the drying temperature is 300°C, and the collected samples are heat-treated at 700°C for 2 hours under the protection of nitrogen, and washed until neutral. Finally, porous wrinkled graphene is obtained with a specific surface area of ​​1636m 2 / g. The morphology of porous and wrinkled graphene is as follows: figure 2 shown.

Embodiment 3

[0023] Take 300ml of 2mg / ml graphene oxide solution, first add 30g of tetraethylenepentamine, react at 100°C for 20h, then add potassium carbonate, the mass ratio of potassium carbonate to graphene oxide is 3:1, mix evenly, and conduct ultrasonic atomization treatment, The drying temperature is 600°C, and the collected samples are heat-treated at 1000°C for 2 hours under the protection of nitrogen, and washed until neutral. Finally, porous wrinkled graphene is obtained with a specific surface area of ​​1218m 2 / g. The morphology of porous and wrinkled graphene is as follows: image 3 shown.

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Abstract

The invention provides a preparation method of porous folded graphene with high specific surface area. A oxidized graphene solution and a water-soluble nitrogenous compound are mixed; after reaction is performed for certain time at certain temperature, pore forming agents are added and are uniformly mixed to obtain mixed liquid; the mixed liquid is subjected to ultrasonic atomization; heating is performed at certain temperature, so that the solvent in the mixed liquid is volatilized; oxidized graphene / pore forming agent powder particles are obtained; the obtained oxidized graphene / pore forming agent powder particles are collected and are subjected to heat treatment under the inert gas protection; a folded graphene product with high specific surface area is obtained, wherein the heat treatment temperature is 600 to 1100 DEG C; the pore forming agents are NaOH, KOH, K2CO3 and the like; the specific surface area of the obtained product is 1000 to 2000m<2> / g. The appearance of the foldedgraphene is maintained; meanwhile, high specific surface area can be obtained.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to graphene, in particular to a method for preparing porous wrinkled graphene with high specific surface area. Background technique [0002] Graphene is based on sp 2 A two-dimensional honeycomb crystal composed of hybridized carbon atoms. In theory, two-dimensional graphene has ultra-high specific surface area, good electrical conductivity, high carrier mobility, high mechanical strength, etc., making it attract much attention in the application of two-dimensional materials. At present, an obstacle to the industrial application of graphene materials is the van der Waals force between graphene sheets, which makes it easy to aggregate between layers, which greatly reduces its specific surface area and limits its performance. application. A feasible method is to transform the two-dimensional nanosheet structure into a three-dimensional wrinkled cluster structure. Unlike flat sheets, ...

Claims

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Application Information

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IPC IPC(8): C01B32/184
CPCC01B2204/32
Inventor 唐志红赵劲林杨俊和
Owner UNIV OF SHANGHAI FOR SCI & TECH
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