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Preparation method of series of novel tungsten rare earth based MAX phases and derivative two-dimensional tungsten-based layered carbides thereof

A series of rare-earth-based technologies, applied in the preparation of new tungsten rare-earth-based MAX phases and their derived two-dimensional tungsten-based carbides, can solve the problems of less research on W-based MXenes and achieve the effect of increasing specific capacity

Active Publication Date: 2021-10-29
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are very few studies on W-based MXenes, and only (W 2 / 3 sc 1 / 3 ) 2 AlC and (W 2 / 3 Y 1 / 3 ) 2 AlC has two MAX phases, so it is of great significance to prepare new W-based MAX phases and MXene

Method used

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  • Preparation method of series of novel tungsten rare earth based MAX phases and derivative two-dimensional tungsten-based layered carbides thereof
  • Preparation method of series of novel tungsten rare earth based MAX phases and derivative two-dimensional tungsten-based layered carbides thereof
  • Preparation method of series of novel tungsten rare earth based MAX phases and derivative two-dimensional tungsten-based layered carbides thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh the powder with a mass ratio of W:R:Al:C=4:2:3.6:2.4, R=Gd, Tb, Dy, Ho, Er, Tm or Lu. Put it into a ball mill pot and mill it for 7 hours. After the powder is uniformly mixed, it is cold-pressed into a tablet, placed in a vacuum sintering furnace, heated to 1400°C at a heating rate of 5°C / min, and kept for 3 hours to obtain (W 2 / 3 R 1 / 3 ) 2 AlC phase.

[0025] Take 1 gram of ground into powder (W 2 / 3 R 1 / 3 ) 2 AlC, placed in a mixed solution of 1 g of LiF and 20 ml of HCl, stirred in a water bath at 35°C for 60 hours, washed with deionized water for 10 times after the reaction, and added deionized water again after the pH value of the resulting mixed solution was neutral , a stable W-based MXene suspension was obtained by ultrasonication for 1 hour.

[0026] After freeze-drying the resulting W-based MXene suspension, weigh the mass ratio of W 1.33 C: Ti 3 C 2 = 2:1 powder, mixed evenly and ultrasonically treated for 2 hours, then vacuum filtered to obtain...

Embodiment 2

[0028] Similar to Example 1, the cold-pressed sheet is heated to 1500°C at a rate of increase of 5°C / min, and kept for 1 hour, and (W 2 / 3 R 1 / 3 ) 2 AlC phase.

[0029] The preparation process of W-based MXene is the same as in Example 1. During the preparation of composite membrane, W 1.33 C and Ti 3 C 2 The ratio can be adjusted when W 1.33 C: Ti 3 C 2 =1:1, it can be obtained from a supporting flexible film.

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Abstract

The invention discloses a preparation method of a series of novel tungsten rare earth based MAX phases and derived two-dimensional tungsten-based layered carbides thereof, and belongs to the field of novel materials. The chemical formula of the tungsten rare earth based MAX phase is (W2 / 3R1 / 3) 2AlC; the material is composed of tungsten, lanthanide rare earth metal, aluminum and carbon, and has a monoclinic crystal structure. Metal carbide layers and aluminum atom layers are alternately arranged along a certain crystal axis, each metal carbide layer is formed by alternately and periodically arranging two W atoms and one rare earth metal atom, the atoms in the metal carbide layers are bonded through relatively strong covalent bonds, and the metal carbide layers and the aluminum atom layers are bonded through relatively weak metal bonds to form a layered structure; the tungsten rare earth based MAX phase has high hardness comparable to that of a traditional hard alloy, and the two-dimensional tungsten-based layered carbide derived from the MAX phase can be further applied to the field of energy storage.

Description

technical field [0001] The invention belongs to the field of new materials, and relates to a series of preparation methods of novel tungsten rare earth-based MAX phases and derived two-dimensional tungsten-based carbides. Background technique [0002] New energy development has become the mainstream of my country's future energy development, including wind energy, water energy, nuclear energy and other energy technologies have been widely used. However, energy storage is an unavoidable subject. The supercapacitor is a new type of energy storage and conversion device, which not only has a high energy density, but also has a high power density. It is a kind of energy that can solve the growing energy demand in the era of energy shortage. Two-dimensional materials represented by graphene are widely used in the field of new energy. [0003] In recent years, a new two-dimensional material MXene has emerged, which is obtained by chemical etching from its three-dimensional MAX ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/622C04B35/645
CPCC04B35/5626C04B35/622C04B35/645C04B2235/3843C04B2235/3817C04B2235/6581C04B2235/96
Inventor 崔伟斌杨家鑫孙淑丽王强
Owner NORTHEASTERN UNIV LIAONING