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Preparation method of ordered graphene porous membrane

A graphene film and graphene technology, applied in the manufacture of hybrid/electric double layer capacitors, etc., can solve the problems of lack of graphene dispersion system pretreatment and pre-orientation, poor product structure order, complicated operation, etc., and achieve regular structure. , high degree of order, quick and easy operation

Active Publication Date: 2014-12-24
ZHEJIANG TANGUSHANGXI MATERIAL SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical vapor deposition method is highly dependent on the three-dimensional structure of the metal template, the steps are cumbersome, and the operation is complicated; other methods lack the pretreatment and preorientation of the graphene dispersion system, and the obtained product structure is poor
The facile and rapid preparation of highly ordered graphene porous membranes remains a great challenge

Method used

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  • Preparation method of ordered graphene porous membrane
  • Preparation method of ordered graphene porous membrane
  • Preparation method of ordered graphene porous membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Treat 1 part by weight of graphene and 5 parts by weight of water at 20° C. with 10 KHz ultrasound for 1 hour to obtain a graphene dispersion.

[0024] 2) Extrude the graphene dispersion at a speed of 500 mL / h in a straight die preparation device, and then stay in liquid nitrogen for 50 seconds to solidify into a film, and then further freeze-dry or critical freeze-dry After 30 hours, a graphene porous ordered film was finally obtained.

[0025] Such as Figure 4 As shown, the obtained graphene ordered porous film has a good orientation arrangement structure and a regular pore structure. The graphene sheets are arranged and piled up in the axial direction to form through holes along the film extrusion direction, and the density is 0.03-0.04g / cm 3 , the tensile strength is 10-15MPa, the compressive strength is 2-4MPa, the thickness of the film is 100-500 microns, the width is 0.1-100 cm, the elongation at break is 8-10%, the conductivity is greater than 1000S / m, the ...

Embodiment 2

[0027] 1) Treat 1 part by weight of graphene and 100 parts by weight of water at 60° C. for 10 hours with a 5 KHz ultrasonic wave to obtain a graphene dispersion.

[0028] 2) The graphene dispersion was continuously extruded at a speed of 300 mL / h in the preparation device of the inline die, and then stayed in liquid nitrogen for 20 seconds to solidify into a film, and then further critically freeze-dried for 24 hours, and finally A graphene porous ordered film is obtained.

[0029] The obtained graphene ordered porous membrane, the graphene sheets are arranged and stacked along the axial direction to form through holes along the extrusion direction of the membrane, and the density is 0.03-0.04g / cm 3 , the tensile strength is 10-15MPa, the compressive strength is 2-4MPa, the thickness of the film is 100-500 microns, the width is 0.1-100 cm, the elongation at break is 8-10%, the conductivity is greater than 1000S / m, the porosity The rate is 99%. This large-porosity conductive...

Embodiment 3

[0031] 1) Treat 1 part by weight of graphene oxide and 30 parts by weight of water at 40° C. with 10 KHz ultrasound for 5 hours to obtain a graphene oxide dispersion.

[0032] 2) The graphene oxide dispersion was continuously extruded at a speed of 1000 mL / h in a preparation device with a straight die, and then stayed in liquid nitrogen for 100 seconds to solidify to form a film, and then further freeze-dried for 40 hours, Finally, an ordered porous graphene oxide porous membrane is obtained.

[0033] 3) The ordered porous graphene oxide membrane obtained in step (2) was placed in a 30% vitamin C aqueous solution for reduction for 48 hours, washed and dried to obtain a graphene porous ordered membrane.

[0034] The obtained graphene ordered porous membrane, the graphene sheets are arranged and stacked along the axial direction to form through holes along the extrusion direction of the membrane, and the density is 0.03-0.04g / cm 3 , the tensile strength is 10-15MPa, the compres...

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Abstract

The invention discloses a preparation method of an ordered graphene porous membrane. The preparation method comprises the following steps: mixing 1 part by weight of graphene or graphene oxide with 10-1000 parts by weight of water to obtain a mixture; then, squeezing the mixture in a preparation device with a straight outlet, freezing the mixture in liquid nitrogen, performing freeze-drying or supercritical drying on the frozen mixture to obtain the ordered graphene porous membrane. The obtained graphene porous membrane has low density, high porosity, a controllable pore size, excellent mechanical performances and good toughness, and can be used for a plurality of different fields such as energy devices, water treatment, loading of various catalysts and electrochemical sensors.

Description

technical field [0001] The invention relates to a preparation method of a graphene film, in particular to a preparation method of a graphene ordered porous film. Background technique [0002] In 2010, two professors of the University of Manchester, Andre Geim and Konstantin Novoselov, won the Nobel Prize in Physics for the first successful separation of stable graphene, which set off a worldwide wave of research on graphene. Graphene is a two-dimensional monolayer crystal with the highest strength among known materials (Science, 2008, 321 , 385-388) and excellent electrical and thermal conductivity, is currently the most ideal two-dimensional nanomaterials. Macroscopically assembled graphene is the main application form of nanoscale graphene. Two-dimensional nanoscale graphene can be assembled into one-dimensional fibers, two-dimensional films and three-dimensional macroscopic materials. Because of the large surface area and high strength of graphene, three-dimensional gra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04H01G11/84
Inventor 高超刘峥黄铁骑孙海燕夏芝香
Owner ZHEJIANG TANGUSHANGXI MATERIAL SCI & TECH
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