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Graphene porous membrane and preparation method thereof

A graphene and porous membrane technology, applied in the field of graphene porous membrane and its preparation, can solve the problems of difficult migration, difficult to obtain graphene self-supporting structure, low specific surface area of ​​ions, etc., to achieve rich ion transmission channels and excellent electronic conductivity Network, the effect of simplifying the preparation process

Active Publication Date: 2018-11-13
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the graphene film has high electrical and thermal conductivity, the stacking of graphene sheets is relatively dense, so that the active material loading is extremely low and electrolyte ions are difficult to migrate in the graphene film, especially in the vertical direction, and the ions can reach a ratio of Low surface area; this leads to low mass-specific capacity and poor rate performance as an energy storage material
[0004] Chinese patent CN107416814A discloses "a method for preparing graphene with solid-phase assisted microwave", but it only discloses a reduction process with external heating, so it is difficult to obtain a self-supporting structure of graphene with pores, and the equipment is relatively complicated
Chinese patent CN 107500271A discloses "a method for preparing a flexible graphene membrane". Although the obtained graphene membrane has certain pores inside, its pore size distribution is extremely irregular and does not have a connected pore structure.

Method used

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  • Graphene porous membrane and preparation method thereof
  • Graphene porous membrane and preparation method thereof
  • Graphene porous membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A preparation method for a graphene porous membrane, comprising the following steps:

[0033] (1) Preparation of graphene oxide-based aqueous dispersion

[0034] Add graphite oxide into deionized water, adjust the pH to 9 with ammonia water, and stir mechanically for 72 hours to obtain a graphene oxide colloidal dispersion, and control the concentration of graphene oxide to 2 mg / mL;

[0035] Then add polyvinylpyrrolidone and easily dispersible graphene prepared by cobalt-60 gamma ray radiation reduction, mechanically stir and mix at room temperature (25°C) for 1 hour, and control graphene oxide: polyvinylpyrrolidone: via cobalt-60 The mass ratio of the easily dispersible graphene prepared by gamma ray radiation reduction is 100:30:0.5, and the graphene oxide-based aqueous dispersion is obtained.

[0036] (2) Preparation of graphene oxide-based composite film

[0037] Using a polyvinylidene fluoride filter membrane with a pore size of 0.45 microns, the graphene oxide-b...

Embodiment 2

[0062] A preparation method for a graphene porous membrane, comprising the following steps:

[0063] (1) Preparation of graphene oxide-based aqueous dispersion

[0064] Add graphite oxide into deionized water, adjust the pH to 10 with ammonia water, and stir mechanically for 72 hours to obtain a graphene oxide colloidal dispersion, and control the concentration of graphene oxide to 5 mg / mL;

[0065] Then add poly(ethylene oxide-propylene oxide) block copolymer and easily dispersible graphene obtained by chemical reduction with hydrazine hydrate, mechanically stir and mix at room temperature (25°C) for 0.5 hour, and control graphene oxide:poly(ethylene oxide -propylene oxide) block copolymer: the mass ratio of the easily dispersible graphene obtained through chemical reduction with hydrazine hydrate is 100:10:5 to obtain a graphene oxide-based aqueous dispersion.

[0066] (2) Preparation of graphene oxide-based composite film

[0067] Using a polycarbonate filter membrane wit...

Embodiment 3

[0071] A preparation method for a graphene porous membrane, comprising the following steps:

[0072] (1) Preparation of graphene oxide-based aqueous dispersion

[0073] Add graphite oxide into deionized water, adjust the pH to 9 with ammonia water, and stir mechanically for 72 hours to obtain a graphene oxide colloidal dispersion, and control the concentration of graphene oxide to 0.5 mg / mL;

[0074] Then add polyvinyl alcohol and easily dispersible graphene obtained through sodium borohydride chemical reduction, mechanically stir and mix at room temperature (25°C) for 1 hour, and control graphene oxide: polyvinyl alcohol: easily dispersible graphene obtained through sodium borohydride chemical reduction The mass ratio of the dispersed graphene is 100:50:2 to obtain a graphene oxide-based aqueous dispersion.

[0075] (2) Preparation of graphene oxide-based composite film

[0076] Using a polytetrafluoroethylene filter membrane with a pore size of 0.22 microns, the graphene o...

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Abstract

The invention relates to a graphene porous membrane. The internal part of the graphene porous membrane has a communicating hole structure with hole diameter which can be adjusted within the range of 20 to 200 nm, the specific surface area is 1000 to 1750 m<2> / g and the conductivity is 15 to 100 S / cm. The preparation method of the graphene porous membrane comprises the following steps: (1) preparing graphene oxide-based aqueous dispersion; (2) preparing a graphene oxide-based composite membrane; and (3) preparing the graphene porous membrane. Graphene easy to disperse serves as a microwave absorbent, so that the microwave treatment uniformity is improved and the preparation flow of the graphene porous membrane is simplified; a water-soluble polymer serves as a structure regulation and control component, so that regulation of the hole structure of the graphene porous membrane and the orientation degree is realized; and the prepared graphene porous membrane has the adjustable communicating hole structure, has good effective surface area and high conductivity, has excellent electronic conductive networks and rich ion transmission channels, can be further compounded with other materials, and is expected to be widely applied in the fields of energy storage and conversion, catalysis and the like.

Description

technical field [0001] The invention relates to the technical field of graphene materials, in particular to a graphene porous membrane with a connected pore structure and a high specific surface area and a preparation method thereof. Background technique [0002] Graphene is a flexible two-dimensional material with high electrical conductivity and high specific surface area, which has broad application prospects in electrochemical energy storage, sensors, catalysis and other fields. Graphene can load various electrochemically active substances to build self-supporting electrodes, which is very suitable for energy storage components of electronic devices that have been continuously developed in the direction of miniaturization, light weight, flexible and foldable in recent years. [0003] At present, graphene self-supporting structures can be mainly divided into graphene aerogels and graphene membranes. The graphene airgel is generally obtained by reducing graphene oxide sel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184
CPCC01B32/184
Inventor 王庚超王文强金洁
Owner EAST CHINA UNIV OF SCI & TECH