Large-size MXene nanosheet rich in oxygen functional groups as well as preparation method and application thereof

An oxygen functional group and nanosheet technology 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 and good stability. Effect

Active Publication Date: 2019-12-27
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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  • Large-size MXene nanosheet rich in oxygen functional groups as well as preparation method and application thereof
  • Large-size MXene nanosheet rich in oxygen functional groups as well as preparation method and application thereof
  • Large-size MXene nanosheet rich in oxygen functional groups as well as preparation method and application thereof

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specific Embodiment approach 1

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

specific Embodiment approach 2

[0042] Specific embodiment two: the present embodiment is a kind of preparation method of the MXene nanosheet of large size, rich in oxygen functional group is finished 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 muddy sediment, stir evenly to obtain a viscous MXene nanosheet slurry; then put the viscous MXene nanosheet slurry in a minus 80-degree ultra-low temperature refrigerator for 2h to 3h, and finally put Freeze drying in a freeze dryer to obtain a freeze-dried product;

[0045] 3. Place the lyophilized product in a solvent for ultrasonication to obtain large-sized, oxygen-rich MXene nanosheets dispersed in the solvent;

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

[0047] This embodiment has the following beneficial effects:

...

specific Embodiment approach 3

[0058] Specific embodiment three: the difference between this embodiment and specific embodiment two is: the preparation method of the two-dimensional MXene nanosheet suspension described in step one is completed in the following steps:

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

[0060] The mass of lithium fluoride described in step 1. and the concentration 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 condition of an ice-water bath and a stirring speed of 200r / min to 1000r / min, and stir until the ternary layered compound MAX powder Uniformly disperse in the lithium fluoride hydrochloric acid solution, then magnetical...

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Abstract

The invention discloses a large-size MXene nanosheet rich in oxygen functional groups as well as a preparation method and an application thereof, and relates to an MXene nanosheet as well as a preparation method and an application of the MXene nanosheet. The invention aims to solve the problem that the transverse size of the MXene nanosheet prepared by the existing method is small. The large-sizeMXene nanosheet being rich in oxygen functional groups is formed by stacking a plurality of few-layer MXene nanosheets. The preparation method comprises the following steps: 1, centrifuging a two-dimensional MXene nanosheet suspension to obtain a muddy precipitate; 2, adding deionized water into the muddy precipitate, stirring the slurry, freezing the slurry in an ultra-low temperature refrigerator at -80 DEG C, and finally freeze-drying in a freeze dryer to obtain a freeze-dried product; and 3, placing the freeze-dried product into a solvent for carrying out ultrasonic treatment. The invention discloses applications of the large-size MXene nanosheet as an electrode material of a supercapacitor or a lithium ion battery. According to the preparation method, the large-size MXene nanosheet rich in oxygen functional groups can be obtained.

Description

technical field [0001] The present invention relates to a kind of MXene nano sheet and its preparation method and application. Background technique [0002] MXene is a novel two-dimensional graphene-like crystal material with a two-dimensional layered structure. It is stripped from the ternary layered compound MAX, where M represents the former transition group metal (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 closely arranged M layers, and the M layers and A layers are alternately arranged to form the MAX phase. The researchers used hydrofluoric acid to etch away the A layer, leaving the M n+1 x n layer. m n+1 x n A layer is a two-dimensional planar structure with a thickness of only a few atomic layers, and it is named MXene to emphasize its similar structure to graphene. MXene includes a large number of transition metal carbides and nitrides, and more th...

Claims

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Application Information

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Patent Type & Authority Applications(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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