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Method for preparing laminar MXenes material by utilizing ternary MAX material

A layered and corrosive liquid technology, applied in nanotechnology, chemical instruments and methods, non-metallic elements, etc. for materials and surface science, can solve problems such as uneven corrosion, prolonged corrosion time, incomplete erosion, etc., to achieve Achieve good results, strong operability, and good microscopic appearance

Active Publication Date: 2018-11-13
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small interlamellar spacing of the original MAX, which will hinder the poor contact between the reactant and HF of the A layer, the corrosion and stripping speed of MAX is slow, which will lead to low corrosion yield and uneven corrosion in the process. , Incomplete denudation and other issues
However, if the corrosion time is prolonged blindly, the M-C structure will be destroyed and M-C fragments will be formed, resulting in failure to obtain layered MXenes materials with good morphology.

Method used

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  • Method for preparing laminar MXenes material by utilizing ternary MAX material
  • Method for preparing laminar MXenes material by utilizing ternary MAX material
  • Method for preparing laminar MXenes material by utilizing ternary MAX material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) Ti, Al, C, Nb 2 o 5 And the compound K salt is mixed evenly with wet ball milling to obtain a mixture; the specific raw material ratio is shown in Table 1 below, KCl in the compound potassium salt: K 2 SO 4 The molar ratio of the compound potassium salt is 2:1, and the dosage of the compound potassium salt is twice the total weight of all other raw materials.

[0036] The weight percentage of each raw material of table 1 embodiment 1

[0037]

[0038]

[0039] The mixed material was prepared into a slurry with absolute ethanol, and the absolute ethanol:mixed material (mass ratio) was 2.2:1; the slurry was mixed uniformly by ball milling for 2.5 hours. Put the mixed raw materials into a drying oven at a drying temperature of 40°C to prevent oxidation of the raw materials when the temperature is too high. After the ethanol is completely volatilized, the raw materials are ground and pulverized and put into a corundum crucible. In a vacuum furnace, keep warm at ...

Embodiment 2

[0047] 1) Combine Cr, Al, C, Nb 2 o 5 And the compound K salt is mixed evenly with wet ball milling to obtain a mixture, and the specific raw material ratio is shown in Table 2 below. In the compound potassium salt, KCl: K 2 SO 4 The molar ratio of the compound potassium salt is 1.8:1, and the dosage of the compound potassium salt is twice the total weight of other raw materials.

[0048] The weight percent of each raw material of table 2 embodiment 2

[0049]

[0050]

[0051] The mixed material was prepared into a slurry with absolute ethanol, and the absolute ethanol:mixed material (mass ratio) was 2.2:1; the slurry was mixed uniformly by ball milling for 2.5 hours. Put the mixed raw materials into a drying oven at a drying temperature of 40°C to prevent oxidation of the raw materials when the temperature is too high. After the ethanol is completely volatilized, the raw materials are ground and pulverized and put into a corundum crucible. In a vacuum furnace, keep ...

Embodiment 3

[0055] 1) Ti, Mo, Al, C, Al 2 o 3 And the compound K salt is mixed evenly with wet ball milling to obtain a mixture, and the specific raw material ratio is shown in Table 3 below. In the compound potassium salt, KCl: K 2 SO 4 The molar ratio of the compound potassium salt is 4:1, and the dosage of the compound potassium salt is twice the total weight of other raw materials.

[0056] The weight percent of each raw material of table 3 embodiment 3

[0057]

Ti

Mo

Al

C

Al 2 o 3

total

wt.%

24

32.5

27

12

4.5

100

[0058] The mixed material was prepared into a slurry with absolute ethanol, and the absolute ethanol:mixed material (mass ratio) was 2.2:1; the slurry was mixed uniformly by ball milling for 2.5 hours. Put the mixed raw materials into a drying oven at a drying temperature of 40°C to prevent oxidation of the raw materials when the temperature is too high. After the ethanol is completely volatilized, the ra...

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Abstract

The invention provides a method for preparing a laminar MXenes material by utilizing a ternary MAX material. The method comprises the following steps: taking strong acid or strong alkali as corrosionliquid and putting the corrosion liquid into a reaction container; putting MAX powder into the corrosion liquid; then adding soluble mixed salt while stirring; continuously corroding for 0.5 to 48h; then centrifuging and separating; washing and drying to obtain the laminar MXenes material. According to the method provided by the invention, the soluble mixed salt of metal with metal activity whichis weaker than that of layer-A metal is added into the corrosion liquid by utilizing a galvanic battery principle, so that the soluble mixed salt is reduced by the layer-A metal to obtain the metal with the metal activity which is weaker than that of the layer-A metal; the metal is combined with the layer-A metal to form a corroded couple; reaction is promoted to be carried out rightward and the corrosion of the layer-A metal is accelerated, so that a single-layer two-dimensional nano material which is completely peeled and corroded is obtained. The method is simple and has strong operabilityand a good realization result; the MXenes material, which has a relatively high peeling degree and a relatively good microcosmic shape, can be obtained.

Description

technical field [0001] The invention relates to a preparation process of a special layered material, in particular to a method for preparing a layered MXenes material by using a ternary MAX material. Background technique [0002] MAX material is a new type of three-dimensional layered crystal with layered structure, and its general chemical formula is M n+1 AX n (n=1~6), referred to as MAX. Among them, M is a transition metal element, A is a group III and IV main group element, and X is a C or N element. All kinds of atoms are covalently bonded in the plane to form atomic-thick sheets, and van der Waals is used between the sheets. force combined. The exfoliation of the material is to use the difference in bond energy between M-A and M-C to break the chemical bond between M-A while maintaining the M-C structure, so that the A layer is separated from the MAX matrix, thereby obtaining a two-dimensional layered nanomaterial. Materials are also known as MXenes materials. Thi...

Claims

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Application Information

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IPC IPC(8): C01B32/921C01B32/914C01B32/90B82Y30/00
CPCB82Y30/00C01B32/90C01B32/914C01B32/921C01P2004/03C01P2002/72
Inventor 张佩马宁方媛方园赵婷秦毅武清王雷
Owner SHAANXI UNIV OF SCI & TECH
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