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Preparation method of two-dimensional VyCr (2-y) CSx nanosheet

A nanosheet and chemical formula technology, applied in the field of preparation of two-dimensional VyCr2-yCSx nanosheets, can solve the problems of structural damage and cumbersomeness of two-dimensional materials, and achieve the effects of simple method, mild reaction conditions and good electrochemical energy storage performance.

Active Publication Date: 2022-06-03
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is not only cumbersome, but also easily leads to the destruction of the structure of the two-dimensional material during the annealing process.

Method used

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  • Preparation method of two-dimensional VyCr (2-y) CSx nanosheet

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A two-dimensional V 2 CS x The preparation method of nanosheets comprises the following steps:

[0026] (1) Mix 51 grams of vanadium powder, 32.4 grams of aluminum powder and 12 grams of carbon powder into the self-propagating reaction tank;

[0027] (2) Add a tungsten wire with a length of 15 cm, ignite under the protection of argon, and react to obtain V 2 AlC MAX bulk material;

[0028] (3) Set V 2 The AlC MAX bulk material is crushed and passed through a 300-400 mesh sieve to obtain V 2 AlC MAX powder;

[0029] (4) Set V 2 AlC MAX powder, ZnS and Na 2 S / K 2 S mixed salt according to 1:9:54 (the Na 2 S / K 2 S mixed salt, Na 2 S and K 2 The mass ratio of S is 1:1) and the mass ratio is uniformly mixed to obtain mixed powder;

[0030] (5) The mixed powder of step (4) was annealed at 950° C. for 10 h under the protection of argon, then washed with 1 mol / L sulfuric acid solution, and then washed with water until neutral to obtain two-dimensional V 2 CS x Nano...

Embodiment 2

[0034] A two-dimensional V 1 Cr 1 CS x The preparation method of nanosheets comprises the following steps:

[0035] (1) Mix 25.5 grams of vanadium powder, 26 grams of chromium powder, 21.6 grams of aluminum powder and 12 grams of carbon powder into the self-propagating reaction tank;

[0036] (2) Add a 5 cm long tungsten wire, ignite under nitrogen protection, and react to obtain V 1 Cr 1 AlC MAX bulk material;

[0037] (3) Set V 1 Cr 1 The AlC MAX bulk material is crushed and passed through a 300-400 mesh sieve to obtain V 1 Cr 1 AlC MAX powder;

[0038] (4) Set V y Cr 2-y AlC MAX powder, ZnS and Na 2 S / K 2 S mixed salt according to 1:3:3 (the Na 2 S / K 2 S mixed salt, Na 2 S and K 2 The mass ratio of S is 1:1) and the mass ratio is uniformly mixed to obtain mixed powder;

[0039] (5) The mixed powder in step (4) was annealed at 700° C. for 3 h under nitrogen protection, then washed with 1 mol / L hydrochloric acid solution, and then washed with water to make i...

Embodiment 3

[0042] A two-dimensional V 1.5 Cr 0.5 CS x The preparation method of nanosheets comprises the following steps:

[0043] (1) Mix 38.25 grams of vanadium powder, 13 grams of chromium powder, 27 grams of aluminum powder and 12 grams of carbon powder into the self-propagating reaction tank;

[0044] (2) Add 10 cm long tungsten wire, ignite under nitrogen protection, and react to obtain V 1.5 Cr 0.5 AlC MAX bulk material;

[0045] (3) Set V 1.5 Cr 0.5 The AlC MAX bulk material is crushed and passed through a 300-400 mesh sieve to obtain V 1.5 Cr 0.5 AlC MAX powder;

[0046] (4) Set V 1.5 Cr 0.5 AlC MAX powder, ZnS and Na 2 S / K 2 S mixed salt according to 1:6:18 (the Na 2 S / K 2 S mixed salt, Na 2 S and K 2 The mass ratio of S is 1:1) and the mass ratio is uniformly mixed to obtain mixed powder;

[0047] (5) The mixed powder in step (4) was annealed at 800° C. for 6 h under argon protection, then washed with 1 mol / L hydrochloric acid solution, and washed with water ...

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Abstract

The invention relates to a preparation method of a two-dimensional VyCr (2-y) CSx nanosheet, which comprises the following steps: uniformly mixing vanadium powder, chromium powder, aluminum powder and carbon powder according to the stoichiometric ratio in a chemical formula VyCr (2-y) AlC, then adding into a self-propagating reaction tank, adding a tungsten filament of 5-15 cm, carrying out ignition reaction under the protection of inert gas to obtain a VyCr (2-y) AlCMAX block material, crushing, sieving with a 300-400-mesh sieve to obtain VyCr (2-y) AlCMAX powder, and finally carrying out vacuum drying to obtain the two-dimensional VyCr (2-y) CSx nanosheet. Uniformly mixing with ZnS and Na2S / K2S mixed salt, performing annealing treatment under the protection of inert gas, and finally performing acid pickling and water washing until the solution is neutral, so as to obtain the ZnS / Na2S / K2S composite material. The method is simple, high-risk reactants such as hydrofluoric acid are not involved, the reaction condition is mild, the adopted mixed salt solvent can be recycled, the requirements of sustainable development and environmental protection are met, and the prepared two-dimensional VyCr2-yCSx nanosheet has good electrochemical energy storage performance.

Description

technical field [0001] The present invention relates to a two-dimensional V y Cr 2-y CS x The invention relates to a preparation method of nanosheets, belonging to the technical field of low-dimensional nanomaterials. Background technique [0002] MXenes is a general term for a new type of two-dimensional transition metal carbides or carbonitrides. In 2011, the research group of Gogotsi and Barsoum of Drexel University used hydrofluoric acid to selectively etch Ti 3 AlC 2 A layer in MAX phase yields a new type of 2D Ti 3 C 2 Nanosheets. In the process of etching the A layer, it will be synchronized in the two-dimensional Ti 3 C 2 A large number of functional groups are introduced into the surface of nanosheets, therefore, its structural formula is usually written as Ti 3 C 2 T x (T=F, OH or O). MAX is M n+1 AX n Abbreviation for phase (n=1, 2 or 3), where M is an early transition metal element, A is a third or fourth main group element, and X is C or N. Due t...

Claims

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Application Information

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IPC IPC(8): C01B32/90
CPCC01B32/90C01P2004/03C01P2004/20C01P2006/40Y02E60/13
Inventor 姚为张孝蒋丽陈志伟王金山许剑光
Owner YANCHENG INST OF TECH