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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  • Summary
  • 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 e

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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Example Embodiment

[0025] Example 1

[0026] (1) First, use the modified Hummers method to prepare graphite oxide; then add 90mL of deionized water and 9mL of styrene monomer to a three-necked flask, continue to pass nitrogen to remove the air in the solution, and magnetically stir for 30min; gradually increase the temperature to 70 ℃, add 10mL of 0.03g / mL potassium persulfate; continue the reaction for 24h, centrifuge and dry to obtain polystyrene pellets;

[0027] (2) The graphite oxide prepared above was ultrasonically peeled into graphene oxide at room temperature, and the concentration was 5g / L. Polystyrene beads and graphene oxide were added to the above solution at a mass of 3:1 and mixed with ultrasonic for 2h to form colloidal particles. , Adjust the pH=8, the polystyrene nanospheres are uniformly dispersed in the graphene oxide, after suction filtration and drying, the polystyrene pellets are calcined at a high temperature in a nitrogen environment and the graphene oxide is thermally reduc...

Example Embodiment

[0028] Example 2

[0029] The template without polystyrene beads was used as a comparative test, and graphene was prepared by the thermal reduction method using the same steps. First, the modified Hummers method was used to prepare graphite oxide, and then the graphite oxide was ultrasonically stripped into graphene oxide at room temperature with a concentration of 5g / L, and then ultrasonicated for 2h to adjust pH=8. After suction filtration and drying, it is calcined at high temperature in a nitrogen environment, and the graphene oxide is thermally reduced to obtain graphene.

[0030] In the experiment, we compared the effects of no template method and template method on the specific surface area, pore size and specific capacitance of graphene. We found that after using the template method, the specific surface area and specific capacitance of graphene were significantly increased, and the average pore size distribution also occurred. Has 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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