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Preparation method of three-dimensional-structure graphene/carbon nanotube hybrid carbon material

A technology of carbon nanotubes and three-dimensional structures, applied in the direction of carbon nanotubes, graphene, nanocarbon, etc., can solve problems such as large contact resistance and limited application fields, and achieve reduced junction resistance, no environmental pollution, and low cost Effect

Active Publication Date: 2017-05-10
JIANGHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above method requires graphene and carbon nanotubes to be synthesized separately, and then assembled to form a three-dimensional structure. Carbon nanotubes are not grown directly from the surface of graphene, and the two are only physically recombined by electrostatic interaction rather than by chemical bonds. Therefore, this composite structure of graphene / carbon nanotubes will have a large contact resistance in some applications, especially in the field of electrochemical energy storage, which limits its application fields.

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  • Preparation method of three-dimensional-structure graphene/carbon nanotube hybrid carbon material
  • Preparation method of three-dimensional-structure graphene/carbon nanotube hybrid carbon material
  • Preparation method of three-dimensional-structure graphene/carbon nanotube hybrid carbon material

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Embodiment 1

[0044] Dissolve 0.005mol of nickel chloride, 0.015mol of hexamethylenetetramine and 0.02mol of resorcinol in 30mL of water to obtain a mixed solution; Stand for reaction for 18 hours, and after cooling to room temperature, obtain the suspension; centrifuge and wash the above suspension, dry at room temperature for 24 hours, take the dried powder precursor and melamine according to the mass ratio of 1:5 and mix them into In a tube furnace, under the protection of nitrogen (nitrogen flow rate 50mL / min), the temperature was raised from room temperature to 700 °C at 2 °C / min, and kept at this temperature for 3 h; naturally cooled to room temperature, a black powder was obtained; the black Put the powder into a 100mL beaker, add 50mL of hydrochloric acid with a molar concentration of 8mol / L, and stir at 60°C for 48h; after that, filter with suction and wash with distilled water several times until the pH of the solution is 6.8-7.2, and the obtained precipitate is cooled at 80°C Aft...

Embodiment 2

[0048] Dissolve 0.005mol nickel acetate, 0.015mol urea and 0.01mol glucose in 30mL distilled water to obtain a mixed solution; then transfer the mixed solution to a 50mL polytetrafluoroethylene reactor, conduct a hydrothermal reaction at 180°C for 12 hours, and cool to room temperature , to obtain a suspension; the suspension was centrifuged and washed at room temperature for 24 hours, and the dried powder precursor and melamine were mixed according to a mass ratio of 1:4, put into a tube furnace, and heated in an argon atmosphere. (Argon gas flow 50mL / min), the temperature was raised from room temperature to 800 °C at 2 °C / min, and kept at this temperature for 2 hours; after natural cooling to room temperature, a black powder was obtained; put the black powder into a 100 mL beaker, Add 50 mL of hydrochloric acid with a molar concentration of 6 mol / L, and stir at 50°C for 48 hours; after that, centrifuge and wash with distilled water several times until the pH of the solution i...

Embodiment 3

[0052] Dissolve 0.005 mol of nickel sulfate, 0.015 mol of potassium hydroxide and 0.015 mol of sucrose in 35 mL of distilled water to obtain a mixed solution; then transfer the mixed solution to a 50 mL polytetrafluoroethylene reactor, and conduct a hydrothermal reaction at 180°C for 24 hours; cool to After room temperature, the suspension was obtained; the suspension was centrifuged and washed at room temperature for 24 hours, and the dried powder precursor and dicyandiamide were mixed according to the mass ratio of 1:4, and put into a tube furnace. Under nitrogen atmosphere (nitrogen flow rate: 50mL / min), raise the temperature from room temperature to 900°C at 2°C / min, and keep it at this temperature for 1h; after naturally cooling to room temperature, a black powder is obtained; put the black powder into a 100mL beaker Add 50 mL of hydrochloric acid with a molar concentration of 6 mol / L, and stir at 80°C for 36 hours; after that, centrifuge and wash with distilled water seve...

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Abstract

The invention discloses a preparation method of a three-dimensional-structure graphene / carbon nanotube hybrid carbon material. The preparation method comprises the following steps: sufficiently dissolving a divalent metal salt, a carbon source precursor and a precipitant in water to obtain a mixed solution; carrying out hydrothermal reaction on the mixed solution to obtain a suspension; sequentially carrying out centrifugation, washing and drying, and taking the dried brown powdery precursor; mixing and grinding the precursor and a cyanamide compound, and carrying out carbonization to obtain the black powder; and finally, carrying out pickling treatment on the black powder to obtain the three-dimensional-structure graphene / carbon nanotube hybrid carbon material. According to the preparation method, the self-template in-situ carbonization catalytic technique is adopted to prepare the three-dimensional-structure graphene / carbon nanotube hybrid carbon material. The carbon nanotubes directly grow out of the graphene surface, and the carbon nanotubes and graphene are connected through sp2 covalent carbon bonds instead of simple physical mixing. The method is simple, is low in cost, and is suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a method for preparing a three-dimensional structure graphene / carbon nanotube hybrid carbon material. Background technique [0002] Carbon nanomaterials have always been a hot spot in scientific research. There are many kinds of carbon materials, which can be divided into zero-dimensional, one-dimensional, two-dimensional and three-dimensional carbon materials according to their dimensions. For example, fullerenes with a zero-dimensional structure were discovered in 1985; in 1991, Japanese scientist SumioIijima discovered carbon nanotubes with a one-dimensional structure; in 2004, two Russian physicists, Andrei Geim and Kostya Novoselov obtained two dimensional single-layer graphene. Graphene is a carbon atom SP 2 Hybridization forms a planar film with a hexagonal honeycomb lattice, only one carbon atom thick 2D carbon material, and other dimensional carbon materials such...

Claims

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Application Information

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IPC IPC(8): C01B32/162C01B32/184
CPCC01B2202/34C01B2204/32C01P2004/03
Inventor 梁济元闫继曹元成汤舜
Owner JIANGHAN UNIVERSITY
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