Method for multidimensional preparation of graphene-based MXene nanoflowers

A technology of graphene nanosheets and nanoflowers, which is applied in the direction of graphene, nanocarbon, nanotechnology, etc., can solve the problems of conductivity and stability constraints, affecting energy storage performance, etc., and achieve high specific capacity and fast ion conduction Sexual and repeatable effect

Active Publication Date: 2021-07-23
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, as an emerging two-dimensional material, MXene has great potential and advantages in electrochemical energy storage as a supercapacitor electrode material, and has been widely studied and concerned by people. However, a single MXene flower-shaped material is limited by its conductivity. and stability constraints, affecting its role in energy storage performance
Secondly, there is no report on the synthesis of MXene nanoflower composites

Method used

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  • Method for multidimensional preparation of graphene-based MXene nanoflowers
  • Method for multidimensional preparation of graphene-based MXene nanoflowers
  • Method for multidimensional preparation of graphene-based MXene nanoflowers

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Adopt the method for preparing supercapacitor of MXene nano flower composite material, comprise the steps:

[0033]Step 1. Take 50ml of 10mg / ml MXene nanosheets and press them into block targets, then place them in the middle of a 2*2cm glass vessel, pour 20ml of graphene oxide nanosheet dispersion, and disperse The liquid will completely immerse the MXene target, and at the same time, insert the air tube of the gas blowing device into the solution, and make it continuously blow in stable argon gas, so as to promote the continuous circulation of the liquid;

[0034] Step 2. Use the femtosecond laser light source to generate the initial Gaussian laser. After passing through the pulse shaper (PULSESHAPER), two sub-pulse lasers with a pulse delay of 10ps are successfully obtained, and then the two sub-pulse lasers with a time delay of 10ps pass through two The aperture is collimated, and then the laser energy is adjusted to 150mw through the attenuation wheel, and then tra...

Embodiment 2

[0038] The method for preparing supercapacitor with MXene nanometer flower composite material, comprises the steps:

[0039] Step is as embodiment 1;

[0040] Step 2. Use the femtosecond laser light source to generate the initial Gaussian laser. After passing through the pulse shaper (PULSESHAPER), two sub-pulse lasers with a pulse delay of 10ps are successfully obtained, and then the two sub-pulse lasers with a time delay of 10ps pass through two The aperture is collimated, and then the laser energy is adjusted to 100mw through the attenuation wheel, and then transported and collimated by two mirrors and two apertures, and finally injected into the self-built T-shaped lens, passing through the T-shaped lens After the space shaping, the Gaussian pulse sequence is shaped into a spatially shaped pulse sequence distributed in the Z-axis direction under the focus of the 10x objective lens. The focal depth distance in the Z-axis direction is 3.5cm, and finally the position of the s...

Embodiment 3

[0044] The method for preparing supercapacitor with MXene nanometer flower composite material, comprises the steps:

[0045] Step is as embodiment 1;

[0046] Step 2. Use the femtosecond laser light source to generate the initial Gaussian laser. After passing through the pulse shaper (PULSESHAPER), two sub-pulse lasers with a pulse delay of 10ps are successfully obtained, and then the two sub-pulse lasers with a time delay of 10ps pass through two The aperture is collimated, and then the laser energy is adjusted to 50mw through the attenuation wheel, and then transported and collimated by two mirrors and two apertures, and finally injected into the self-built T-shaped lens, passing through the T-shaped lens After the space shaping, the Gaussian pulse sequence is shaped into a spatially shaped pulse sequence distributed in the Z-axis direction under the focus of the 10x objective lens. The focal depth distance in the Z-axis direction is 3.5cm, and finally the position of the sp...

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Abstract

The invention relates to a method for multidimensional preparation of graphene-based MXene nanoflowers, and belongs to the field of negative electrode materials of supercapacitors. According to the method, the unique advantages of space-time regulated femtosecond laser are utilized, and a MXene target material is processed in a graphene oxide nano dispersion liquid, so that the MXene nanoflower growing on the reduced graphene oxide substrate is synthesized by a one-step method. The size and morphology of the nanoflower can be regulated and controlled, the nanoflower has an extremely high specific surface area, and when the nanoflower is used as an electrode material of a supercapacitor, the nanoflower shows extremely high specific capacitance and good cycling stability. The method is high in controllability, and large-scale uniform preparation can be achieved. According to the method, a novel composite structure material is synthesized by utilizing space-time regulated femtosecond laser, and a new thought is provided for the field of material synthesis.

Description

technical field [0001] The invention relates to a method for multidimensionally preparing MXene nanoflowers on graphene, in particular to a method for multidimensionally preparing MXene nanoflowers on graphene by using spatiotemporal control of femtosecond lasers, and belongs to the field of negative electrode materials for supercapacitors. Background technique [0002] MXene material is a kind of metal carbon / nitride (transition metalcarbide / nitride) with a two-dimensional layered structure. Its general chemical formula is Mn+1XnTX, where (n=1–3), M represents an early transition metal, such as Ti , Zr, V, Mo, etc.; X represents C or N elements, and Tx is a surface group, usually -OH, -O, -F and -Cl. Because of its similar sheet structure to Graphene, it is named MXene. MXen materials have a large surface area, high adsorption performance, excellent thermal and chemical stability, and good kinetic properties due to their convenient preparation. In terms of electrochemical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184C01B32/90H01G11/24H01G11/30H01G11/36
CPCC01B32/184C01B32/90H01G11/24H01G11/30H01G11/36C01B2204/22C01P2004/03C01P2004/62C01P2006/40Y02E60/13C01P2004/60C01P2004/22B82Y30/00B82Y40/00C01P2004/64
Inventor 姜澜原永玖李欣
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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