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A kind of graphene porous film and preparation method thereof

A graphene and porous film technology, applied in the field of graphene porous film and its preparation, can solve the problems of lack of connected pore structure, complex equipment, poor rate performance, etc.

Active Publication Date: 2021-09-14
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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  • A kind of graphene porous film and preparation method thereof
  • A kind of graphene porous film and preparation method thereof
  • A kind of graphene porous film 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=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: 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 μm, transfer the graphene oxide-base...

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 hours, and control graphene oxide:poly(ethylene oxide -propylene oxide) block copolymer: the mass ratio of easily dispersible graphene obtained by chemical reduction with hydrazine hydrate is 100:10:5, and the graphene oxide-based aqueous dispersion is obtained.

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

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

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 by 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 by 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, transfer the graphene ...

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Abstract

A graphene porous membrane of the present invention has a connected pore structure with an adjustable pore diameter in the range of 20-200nm, and its specific surface area is 1000-1750m 2 / g, electrical conductivity is 15~100S / cm; The preparation method of described graphene porous membrane comprises the following steps: (1) prepares graphene oxide-based aqueous dispersion; (2) prepares graphene oxide-based composite membrane; (3) prepares graphene porous membrane ; The present invention uses easily dispersible graphene as microwave absorber, improves the uniformity of microwave treatment, simplifies the preparation process of graphene porous film; Adjustment of structure and degree of orientation; the prepared graphene porous membrane has an adjustable interconnected pore structure, good effective specific surface area and electrical conductivity, excellent electronic conductive network and abundant ion transport channels, and can be further combined with other materials It is expected to be widely used in energy storage and conversion, catalysis and other fields.

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