Self-annealing graphene self-supporting high-temperature electrothermal film and preparation method thereof

A graphene film, self-supporting technology, applied in graphene, electric heating device, ohmic resistance heating and other directions, can solve the problems of complex process, complicated preparation process of electric heating film and high cost, and achieve simple processing process, short response time and cost. low effect

Active Publication Date: 2021-01-29
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high degree of oxidation of graphene oxide prepared by the chemical oxidation exfoliation method, a suitable self-annealed graphene self-supporting high-temperature electrothermal film is required to be prepared by high-temperature heat treatment at 3000 ° C. Secondly, the preparation process of the electrothermal film is relatively complicated, and it needs to be frozen before heat treatment. After heat treatment, high-pressure pressing or cutting and winding are required, the process is complicated and the cost is high. Therefore, it is urgent to find a self-annealed graphene self-supporting high-temperature electrothermal film with simple process, low cost and easy large-scale application. Preparation method

Method used

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  • Self-annealing graphene self-supporting high-temperature electrothermal film and preparation method thereof
  • Self-annealing graphene self-supporting high-temperature electrothermal film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A kind of preparation method of self-annealing graphene self-supporting high temperature electric heating film, specifically comprises the following steps:

[0039] (1) Immerse the graphite paper as the positive electrode in 98wt% concentrated sulfuric acid, intercalate for 20min under the condition of constant current 0.1A; wrap the graphite paper electrode with PE film after taking out and then completely immerse it in 50wt% sulfuric acid as the positive electrode, at a constant voltage of 10V The exfoliation was complete under the condition of condition; then the electrochemically exfoliated graphene containing functional groups on the surface was obtained by negative pressure filtration, washing with deionized water and drying at room temperature.

[0040] (2) Disperse the electrochemically exfoliated graphene containing functional groups on the surface in deionized water, and ultrasonically disperse it for 60 min to obtain a graphene dispersion with a concentration ...

Embodiment 2

[0045] A kind of preparation method of self-annealing graphene self-supporting high temperature electric heating film, specifically comprises the following steps:

[0046] (1) Immerse the graphite paper as the positive electrode in 98wt% concentrated sulfuric acid, and intercalate for 10 minutes at a constant current of 0.2A; wrap the graphite paper electrode with a PE film after taking it out, and then completely immerse it in 40wt% sulfuric acid as the positive electrode, under a constant current of 12V The exfoliation was complete under the condition of condition; then the electrochemically exfoliated graphene containing functional groups on the surface was obtained by negative pressure filtration, washing with deionized water and drying at room temperature.

[0047] (2) Disperse the electrochemically exfoliated graphene containing functional groups on the surface in deionized water, and ultrasonically disperse for 5 minutes to obtain 0.5 mg / mL graphene dispersion; then filt...

Embodiment 3

[0051] A kind of preparation method of self-annealing graphene self-supporting high temperature electric heating film, specifically comprises the following steps:

[0052] (1) The graphite paper was immersed in 98wt% concentrated sulfuric acid as the positive electrode, and intercalated for 30 minutes at a constant current of 0.1A; after taking out, the graphite paper electrode was wrapped with a PE film and then completely immersed in 60wt% sulfuric acid as the positive electrode, and the constant voltage was 8V. The exfoliation was complete under the condition of condition; then the electrochemically exfoliated graphene containing functional groups on the surface was obtained by negative pressure filtration, washing with deionized water and drying at room temperature.

[0053] (2) The electrochemically exfoliated graphene containing functional groups on the surface was dispersed in deionized water, and ultrasonically dispersed for 90 min to obtain a 5 mg / mL graphene dispersio...

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Abstract

The invention discloses a self-annealing graphene self-supporting high-temperature electrothermal film and a preparation method thereof. The preparation method comprises the following steps: ultrasonically dispersing electrochemical stripping graphene containing functional groups on the surface to obtain graphene dispersion liquid; carrying out suction filtration, blade coating or printing on thegraphene dispersion liquid to form a graphene film, and drying to obtain a self-supporting graphene film; carrying out heat treatment on the self-supporting graphene film to obtain a self-supporting graphene film subjected to heat treatment; and adding an electrode to the self-supporting graphene film subjected to heat treatment to obtain an electrothermal film, and electrifying to heat the electrothermal film to 350-400 DEG C to obtain the self-annealing graphene self-supporting high-temperature electrothermal film. The prepared self-annealing graphene self-supporting high-temperature electrothermal film is uniform in heating temperature, high-temperature cyclic heating shows good stability, the preparation method is simple in procedure and low in cost, and large-scale industrial preparation and application are easy.

Description

technical field [0001] The invention relates to the field of electric heating films, in particular to a self-annealing graphene self-supporting high temperature electric heating film and a preparation method thereof. Background technique [0002] Electrothermal materials have attracted increasing attention due to their wide application in wearable electronics, smart glass, medical devices, and transportation. [0003] Traditional electrothermal materials such as iron-chromium alloys have the disadvantages of large mass, high stiffness and low thermal efficiency; indium tin oxide cannot be used as flexible electronic device components due to its brittleness and cannot meet market demand; metals with nanostructures are also potential candidates. , the electrothermal film based on this material can work at a lower voltage, but for the metal nanowire electrothermal film, the preparation process of the metal nanowire film is quite complicated, and it is prone to oxidation and dam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B3/14H05B3/34H05B3/06C01B32/19C01B32/194
CPCH05B3/145H05B3/34H05B3/06C01B32/19C01B32/194
Inventor 拜永孝陈钦佳
Owner LANZHOU UNIVERSITY
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