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Graphene with porous structure and preparation method of graphene

A porous structure, multi-layer graphene technology, applied in the field of graphene and its preparation, can solve the problems of unsuitable large-scale and low-cost production of graphene, high process control requirements, loss of physical and chemical properties, etc., to achieve convenience The effect of low-cost mass production

Inactive Publication Date: 2011-07-06
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the micromechanical exfoliation method has high requirements for equipment and process control, and is not suitable for large-scale and low-cost production of graphene; although the two methods of graphite intercalation and graphite oxide reduction can directly use graphite to prepare graphene in large quantities, due to Some toxic reagents or other functional groups need to be introduced in the preparation process, and insufficient reduction of graphite oxide will lead to the loss of some physical and chemical properties, especially electrical conductivity; vapor phase chemical deposition is the most widely used large-scale industrial preparation The method of semiconductor thin film material, its production process is very perfect, but the current related research work mostly uses metal substrates to prepare graphene, this method is not suitable for the development of large-scale and low-cost preparation of graphene products
Therefore, there are still some difficulties in obtaining high-quality graphene products in large quantities

Method used

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  • Graphene with porous structure and preparation method of graphene
  • Graphene with porous structure and preparation method of graphene
  • Graphene with porous structure and preparation method of graphene

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0023] In the present embodiment, adopt MgO / Mg(OH) respectively 2 and Al 2 o 3 / Al(OH) 3 As a catalyst, hydrothermal treatment is used to make the morphology of the catalyst into a porous sheet, and the adsorption of the porous structure of the catalyst is used to catalyze the cracking of carbon-containing hydrocarbons, thereby generating porous graphene.

[0024] With MgO / Mg(OH) 2 The preparation of the catalyst is taken as an example. The initial MgO powder used is a light MgO commodity, which mainly contains particles with a diameter of tens of nanometers. For the transmission electron microscope pictures, please refer to figure 1 Middle (a). Disperse MgO powder in deionized water, boil (about 100° C.) and reflux for 24 hours in a flask connected to a condensation column, and then filter and dry with suction after cooling to obtain boiled catalyst powder. After hydrothermal treatment, MgO combines with water to form Mg(OH) 2 , the catalyst consists of granular ( figu...

Embodiment 2

[0032] In this example, MgO was used as the carrier to support Fe components to prepare the catalyst, and the Fe / MgO catalyst prepared by the impregnation method was hydrothermally treated to obtain a catalyst with excellent performance with a sheet-like porous structure, and the catalyst was used to prepare porous Graphene.

[0033] First prepare Fe / MgO catalyst by impregnation method, then disperse Fe / MgO catalyst powder in deionized water, carry out hydrothermal treatment at 80-300°C for 2h, then heat and boil the obtained mixture in a beaker (about 100°C), about 20 The water is evaporated to dryness in 10 minutes, and the catalyst powder after hydrothermal treatment is obtained. The XRD analysis of the catalyst obtained by the above method shows that MgO combines with water to form Mg(OH) 2 , the catalyst consists of granular ( Figure 6 In (a)) transformed into flakes ( Figure 6 In (b)), the iron component is very uniformly dispersed in the flake-like Mg(OH) 2 In , n...

Embodiment 3

[0036] In this example, porous graphene products were prepared by using hydrotalcite compounds with different components.

[0037] Taking the FeCoMo / MgAl hydrotalcite compound as an example, a lamellar catalyst with a ratio of Fe: Co: Mo: Mg: Al = 0.2: 0.2: 0.02: 3: 1 was prepared by the urea method ( Figure 8 middle (a)). The preparation method is as follows: Weigh Fe(NO 3 ) 3 9H 2 O, Co(NO 3 ) 2 .6H 2 O, (NH 4 ) 6 Mo 7 o 24 .4H 2 O, Mg(NO 3 ) 2 ·6H 2 O, Al(NO 3 ) 3 9H 2 O and a certain amount of urea are dissolved in water, the concentration of urea is 3mol / L, and the total concentration of metal ions is 0.08mol / L. Heat the obtained solution to 95-105°C while stirring, keep reflux for 12h, and then statically crystallize at 95°C for 20h, filter and dry the obtained precipitate to obtain FeCoMo / MgAl hydrotalcite compound, which can be decomposed by calcination at 500°C In addition to OH - and CO 3 2- The oxide structure is formed, and a more porous struc...

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Abstract

The invention discloses a graphene with a porous structure and a preparation method of the graphene. The porous grapheme consists of a single-layer or multi-layer graphene structure unit, the single-layer or multi-layer grapheme structure unit has a pore-shaped structure (pore diameter is 0.1-200 nm) and a large specific surface area (300-2000 m<2> / g), thus the graphene has potential application value in the aspects of super-capacitors, conductive filling materials and the like. The preparation method of the porous grapheme is characterized in that MgO, Mg(OH)2, Al2O3, Al(OH)3, hydrotalcite compounds and / or corresponding calcined products of the substances are used as catalysts, or MgO, Mg(OH)2, Al2O3, Al(OH)3, hydrotalcite compounds and / or corresponding calcined products of the substances are used as carriers so as to further load one or more active components of Fe, Co, Ni and Mo and then the obtained substance is used as the catalyst ( the pore diameter of the catalyst is 1-200 nm, and the specific surface area is 10-300 m<2> / g); and then at the temperature of 300-1000 DEG C, the graphene is prepared by using inert gases such as nitrogen, argon, helium and the like and using a hydrocarbon chemical gas phase deposition method.

Description

technical field [0001] The invention relates to a graphene with a porous structure and a preparation method thereof. The graphene belongs to the technical field of new materials, and the preparation method of the graphene covers the technical fields of catalyst preparation and process. Background technique [0002] Graphene, as a new two-dimensional carbon material, was first discovered by Novoselov et al. in 2004 (Novoselov, K.S.; Geim, A.K.; Morozov, S.V.; Jiang, D.; Zhang, Y.; Dubonos, S.V. ; Grigorieva, I.V.; Firsov, A.A. Science 2004, 306, 666-9). Graphene is the thinnest and strongest material known so far. It has excellent electrical conductivity, can withstand current densities six orders of magnitude higher than copper, has record thermal conductivity, and has high hardness and good ductility at the same time. (Geim, A.K. Science 2009, 324, 1530-4). In addition, if graphene, a typical two-dimensional planar structure material, can be tailored at will, graphene mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/00C01B31/04
Inventor 宁国庆高金森王刚
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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