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Method for preparing RGO/MXene-sulfuric acid supercapacitor flexible electrode with compact structure in one step and application of RGO/MXene-sulfuric acid supercapacitor flexible electrode

A technology of supercapacitors and flexible electrodes, applied in the field of electrochemistry, can solve the problems of low volume energy density of capacitors, reduced energy density of capacitors, poor wettability of electrode materials, etc. Effect

Active Publication Date: 2020-04-10
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For traditional supercapacitors, binders and current collectors are essential parts, but considering the electrochemical performance of the entire device, their existence has also become a major drawback of traditional capacitors
At the same time, the capacitance of the additive is small, which will inevitably lead to a decrease in the energy density of the entire capacitor
Not only that, because the electrodes of supercapacitors of graphene and its derivatives are generally porous structures obtained by disordered arrangement of graphene, this disordered porous structure leads to a series of structural defects and at the same time causes the whole capacitor to be low. volumetric energy density
In addition, in order to improve the flexibility of supercapacitors, solid or quasi-solid electrolytes are generally used. Due to the hydrophobicity of graphene and the low fluidity of solid or quasi-solid electrolytes, the wettability of the electrode materials is poor, which makes full contact between the electrolyte and the electrode materials. become an important problem to be solved

Method used

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  • Method for preparing RGO/MXene-sulfuric acid supercapacitor flexible electrode with compact structure in one step and application of RGO/MXene-sulfuric acid supercapacitor flexible electrode
  • Method for preparing RGO/MXene-sulfuric acid supercapacitor flexible electrode with compact structure in one step and application of RGO/MXene-sulfuric acid supercapacitor flexible electrode
  • Method for preparing RGO/MXene-sulfuric acid supercapacitor flexible electrode with compact structure in one step and application of RGO/MXene-sulfuric acid supercapacitor flexible electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Preparation of MXene aqueous dispersion:

[0048] Etching: Put the plastic beaker into a water bath, add 10ml deionized water and 10ml concentrated hydrochloric acid (12mol / L) to the beaker, stir magnetically for 10 minutes, continue to add 1g lithium fluoride to the beaker, continue to stir for 10 minutes, After stirring evenly, slowly add 1g Ti 3 AlC 2 After all the materials are uniformly stirred, the beaker is sealed with plastic wrap, and heated in a water bath at 55°C for 24 hours. The whole process is operated in a fume hood.

[0049] Dispersion: After the etching is completed, the etched solution is centrifuged and washed at a speed of 8000r / min until it is neutral. Disperse the washed precipitate in 200ml of deionized water, stir for 24 hours, ultrasonicate for 30 minutes, centrifuge at 3500r / min, and discard the precipitate to obtain an aqueous dispersion of layered MXene.

[0050] (2) Preparation of graphene oxide aqueous dispersion:

[0051] In a 500ml beaker,...

Embodiment 2

[0057] (1) Preparation of MXene aqueous dispersion:

[0058] Etching: Put the plastic beaker into the water bath, add 5ml deionized water and 8ml concentrated hydrochloric acid (12mol / L) to the beaker, magnetically stir for 10 minutes, continue to add 0.8g lithium fluoride to the beaker, continue to stir for 15 minutes , After stirring evenly, slowly add 0.8g Ti 3 AlC 2 After all the materials are evenly stirred, the beaker is sealed with plastic wrap and heated in a water bath at 45°C for 18 hours. The whole process is operated in a fume hood.

[0059] Dispersion: After the etching is completed, the etched solution is centrifuged and washed at a speed of 7500r / min until it is neutral. Disperse the washed precipitate in 180ml of deionized water, stir for 20 hours, ultrasonicate for 20 minutes, centrifuge at 3000r / min, and discard the precipitate to obtain an aqueous dispersion of MXene.

[0060] (2) Preparation of graphene oxide aqueous dispersion:

[0061] In a 500ml beaker, add 70...

Embodiment 3

[0067] (1) Preparation of MXene aqueous dispersion:

[0068] Etching: Put the plastic beaker into the water bath, add 6ml deionized water and 9ml concentrated hydrochloric acid (12mol / L) into the beaker, stir magnetically for 15 minutes, continue to add 0.9g lithium fluoride to the beaker, continue stirring for 10 minutes , After stirring evenly, slowly add 0.9g Ti 3 AlC 2 After all the materials are uniformly stirred, the beaker is sealed with plastic wrap, and heated in a water bath at 50°C for 20 hours. The whole process is operated in a fume hood.

[0069] Dispersion: After the etching is completed, the etched solution is centrifuged and washed at a speed of 7700r / min until it is neutral. Disperse the washed precipitate into 190ml of deionized water, stir for 21 hours, ultrasonicate for 30 minutes, centrifuge at 3500r / min, and discard the precipitate to obtain an aqueous dispersion of MXene.

[0070] (2) Preparation of graphene oxide aqueous dispersion:

[0071] In a 500ml beake...

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Abstract

The invention belongs to the field of electrochemistry, and particularly relates to a method for preparing a graphene / MXene-sulfuric acid supercapacitor flexible electrode with a compact structure inone step and an application of the graphene / MXene-sulfuric acid supercapacitor flexible electrode. The preparation method comprises the following steps of mixing a graphene oxide aqueous dispersion with an MXene aqueous dispersion, adding sulfuric acid, and uniformly mixing; and soaking a metal zinc sheet into the uniformly mixed solution, standing to obtain a composite film on the surface of themetal zinc sheet, and stripping to obtain the RGO / MXene-H2SO4 composite film. According to the invention, the RGO / MXene-H2SO4 composite film with an orderly arranged compact structure is prepared by adopting a layer-by-layer assembly method, and the non-volatile liquid electrolyte molecules are synchronously and horizontally distributed on the surface of an electrode material in the self-assemblyprocess of the film, so that the full contact between the electrode material and the electrolyte is realized. The method has the advantages of being simple, high in designability, wide in applicability, good in electrochemical performance and the like, and has the wide application prospects in the fields of electrochemical materials and the like.

Description

Technical field [0001] The invention belongs to the field of electrochemistry, and specifically relates to a method for preparing a compact structure RGO / MXene-sulfuric acid supercapacitor flexible electrode in one step and its application. Background technique [0002] Energy and environmental issues are two major issues that humanity needs to solve urgently. Today, when fossil energy is depleted, environmental pollution is increasingly serious, and global climate is warming, it is particularly urgent to seek renewable green energy to replace traditional fossil energy and to seek harmony between humans and the environment. New types of renewable energy, such as the use of wind and solar energy, the gradual marketization of electric vehicles and hybrid electric vehicles, and the rapid development of various portable electrical devices require efficient, practical, and "green" energy storage and transportation systems. . For new "green" energy storage devices, while paying atten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/24H01G11/30H01G11/36
CPCH01G11/24H01G11/30H01G11/36H01G11/86Y02E60/13
Inventor 杨东平曹俊孟波王怡
Owner SHANDONG UNIV OF TECH
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