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A kind of mxene nanosheet with large size and oxygen-rich functional group and its preparation method and application

A technology of oxygen functional groups and nanosheets, which is applied to large-sized, oxygen-rich MXene nanosheets and their preparation and application fields, which can solve the problems of small lateral size of MXene nanosheets and achieve good electrochemical performance.

Active Publication Date: 2022-02-11
HARBIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the lateral dimensions of the MXene nanosheets prepared by the existing method are small, and provide a large-size, oxygen-rich MXene nanosheet and its preparation method and application

Method used

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  • A kind of mxene nanosheet with large size and oxygen-rich functional group and its preparation method and application
  • A kind of mxene nanosheet with large size and oxygen-rich functional group and its preparation method and application
  • A kind of mxene nanosheet with large size and oxygen-rich functional group and its preparation method and application

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specific Embodiment approach 1

[0041] Embodiment 1: This embodiment is a large-sized, oxygen-rich MXene nanosheet composed of a plurality of few-layer MXene nanosheets stacked, with nano-scale pores between two adjacent few-layer MXene nanosheets structure, wherein the number of layers of the few-layer MXene nanosheets is 1-5 layers, and the thickness is 1nm-6nm; the lateral size of the large-sized, oxygen-rich MXene nanosheets is 50μm or more, and the thickness is 10nm-30nm .

specific Embodiment approach 2

[0042] Specific embodiment 2: This embodiment is a preparation method of large-sized, oxygen-rich MXene nanosheets, which is completed according to the following steps:

[0043] 1. Centrifuge the two-dimensional MXene nanosheet suspension, pour off the supernatant, and obtain a muddy precipitate;

[0044] 2. First, add deionization to the mud-like sediment and stir evenly to obtain a viscous MXene nanosheet slurry; then put the viscous MXene nanosheet slurry into an ultra-low temperature refrigerator of minus 80 degrees to freeze for 2h~3h, and finally put it in Freeze-drying in a freeze dryer to obtain a freeze-dried product;

[0045] 3. Put the lyophilisate in a solvent for ultrasound to obtain large-sized, oxygen-rich MXene nanosheets dispersed in the solvent;

[0046] The mass ratio of the lyophilizate described in the step 3 to the volume of the solvent is (1mg~5mg): (1mL~10mL).

[0047] This embodiment has the following beneficial effects:

[0048] 1. The lateral size...

specific Embodiment approach 3

[0058] Embodiment 3: The difference between this embodiment and Embodiment 2 is that the preparation method of the two-dimensional MXene nanosheet suspension described in step 1 is completed according to the following steps:

[0059] 1. Add lithium fluoride into the hydrochloric acid with a concentration of 6mol / L~12mol / L, and then magnetically stir for 5min~10min at a stirring speed of 300r / min~500r / min to obtain a lithium fluoride hydrochloric acid solution;

[0060] The quality and concentration of the lithium fluoride described in step 1. are that the volume ratio of the hydrochloric acid of 6mol / L~12mol / L is (1g~3g): 20mL;

[0061] ②. Add the ternary layered compound MAX powder to the lithium fluoride hydrochloric acid solution in 3 to 15 times under the conditions of an ice-water bath and a stirring speed of 200r / min to 1000r / min, and stir until the ternary layered compound MAX powder Disperse evenly into the lithium fluoride hydrochloric acid solution, and then magnetic...

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Abstract

An MXene nanosheet with a large size and rich in oxygen functional groups and its preparation method and application, which relates to an MXene nanosheet and its preparation method and application. The purpose of the present invention is to solve the problem that the lateral size of the MXene nanosheets prepared by the existing method is small. A large-sized, oxygen-functional group-rich MXene nanosheet is stacked by multiple few-layer MXene nanosheets. Preparation method: 1. Centrifuge the suspension of two-dimensional MXene nanosheets to obtain a muddy precipitate; 2. Add deionized water to the muddy precipitate, stir, and then put it in a minus 80-degree ultra-low temperature refrigerator to freeze, and finally Putting it into a freeze dryer for freeze-drying to obtain a freeze-dried product; 3. placing the freeze-dried product in a solvent for ultrasonication. A large-scale MXene nanosheet is used as an electrode material for supercapacitors or lithium-ion batteries. The invention can obtain a large-sized MXene nanosheet rich in oxygen functional groups.

Description

technical field [0001] The present invention relates to an MXene nanosheet and a preparation method and application thereof. Background technique [0002] MXene is a novel two-dimensional graphene-like crystal material with two-dimensional layered structure. It is exfoliated from the ternary layered compound MAX, where M represents the pre-transition group metals (Ti, Nb, Ta, V, Mo, Cr, Zr), A is mainly IIIA and IVA group elements, and X is carbon or nitrogen. . The X atoms are located in the octahedral center of the densely arranged M layers, and the M layers are alternately arranged with the A layers to form the MAX phase. The researchers etched away the A layer with a hydrofluoric acid reaction, leaving the M n+1 X n Floor. M n+1 X n The layer is a two-dimensional planar structure with a thickness of only a few atomic layers, and is named MXene in order to emphasize the similar structure to graphene (Graphene). MXene includes a huge number of transition metal carb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/921B82Y30/00
CPCC01B32/921B82Y30/00C01P2004/20C01P2006/40C01P2004/61
Inventor 武立立杨月张喜田于海玲李璐
Owner HARBIN NORMAL UNIVERSITY
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