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Preparation method for graphene with three-dimensional porous structure

A three-dimensional porous and graphene technology, applied in the field of materials, can solve the problems of low Coulombic efficiency, fast attenuation, and low specific surface area, and achieve the effect of firm pore structure, avoiding toxic chemical reagents and graphene agglomeration, and simple steps

Active Publication Date: 2015-01-07
FUZHOU UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, two-dimensional graphene materials have limitations as supercapacitor electrode materials, such as low initial Coulombic efficiency, fast attenuation during charge and discharge, and graphene is easy to agglomerate and stack, and the actual specific surface area is much lower than the theoretical specific surface area. It is necessary to effectively design its microstructure at the molecular scale

Method used

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  • Preparation method for graphene with three-dimensional porous structure
  • Preparation method for graphene with three-dimensional porous structure
  • Preparation method for graphene with three-dimensional porous structure

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Effect test

Embodiment 1

[0026] (1) Firstly, the improved Hummers method was used to prepare graphite oxide; then, 90 mL of deionized water and 9 mL of styrene monomer were added to the three-neck flask, and the air in the solution was continuously vented with nitrogen, and magnetically stirred for 30 minutes; the temperature was gradually raised to 70 ℃, add 0.03g / mL potassium persulfate 10mL; continue to react for 24h, centrifuge and dry to obtain polystyrene pellets;

[0027] (2) Ultrasonically exfoliate the graphite oxide prepared above into graphene oxide at room temperature, the concentration is 5g / L, polystyrene pellets and graphene oxide are added to the above solution at a mass ratio of 3:1 and mixed by ultrasonic for 2 hours to form colloidal particles , adjust pH=8, polystyrene nanospheres are evenly dispersed in graphene oxide, after suction filtration and drying, thermally decompose polystyrene beads in a nitrogen environment and thermally reduce graphene oxide to obtain a three-dimensiona...

Embodiment 2

[0029] No polystyrene pellet template was added as a comparative test, and graphene was prepared by thermal reduction method using the same steps. First, the improved Hummers method was used to prepare graphite oxide, and then the graphite oxide was ultrasonically exfoliated into graphene oxide at room temperature with a concentration of 5g / L, and then ultrasonicated for 2h to adjust the pH to 8. After suction filtration and drying, it is calcined at a high temperature in a nitrogen atmosphere, and the graphene oxide is thermally reduced to obtain graphene.

[0030] In the experiment, we compared the effects of not using template method and using template method on graphene specific surface area, pore size and specific capacitance, and found that after using template method, graphene specific surface area and specific capacitance were significantly improved, and the average pore size distribution also occurred. changed a lot.

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Abstract

The invention provides a preparation method for graphene with a three-dimensional porous structure. An even dispersion liquid is formed under the electrostatic interaction of a polystyrene template and graphene oxide, then the polystyrene template is removed through high-temperature calcination, and graphene with the three-dimensional porous structure is obtained after thermal reduction. According to the method, polystyrene spheres are taken as the template, and the pore size in graphene can be effectively controlled through controlling the particle size of the polystyrene spheres; and graphene is prepared through a calcination reduction method, so that problems of poisonous chemical reagent application and graphene agglomeration in a chemical reduction process can be avoided, and meanwhile the poriform structure of graphene after calcination is firmer.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for preparing graphene with a three-dimensional porous structure. Background technique [0002] Graphene, as another new carbon allotrope following the discovery of fullerene and carbon nanotubes, has a unique atomic structure and electronic structure, making it exhibit a variety of extraordinary properties that traditional materials do not have, such as super large The theoretical specific surface area, good electrical and thermal conductivity, excellent mechanical properties and optical properties, etc., have become the choice of electrode materials for a new generation of supercapacitors. However, two-dimensional graphene materials have limitations as supercapacitor electrode materials, such as low initial Coulombic efficiency, fast attenuation during charge and discharge, and graphene is easy to agglomerate and stack, and the actual specific surface are...

Claims

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Application Information

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IPC IPC(8): C01B31/04
CPCC01B32/20
Inventor 郑玉婴汪晓莉
Owner FUZHOU UNIVERSITY
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