Two-dimensional transition metal carbonitride as well as preparation method and application thereof

A technology of transition metals and carbonitrides, applied in the field of two-dimensional materials, can solve the problems of the influence of electrochemical properties of materials, production equipment and high environmental safety requirements, and achieve high specific capacitance, good rate performance and broad prospects

Active Publication Date: 2020-08-07
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods inevitably involve the use of hydrofluoric acid or the use of a mixture of alkali metal fluoride and strong acid, the latter generates hydrofluoric acid upon mixing, and hydrofluoric acid is very corrosive, and its use and post-processing may cause safety production and environmental protection factors; in addition, the surface of MXene prepared by these methods has more F functional groups, which has a negative impact on the electrochemical performance of the material
In addition, patent CN110540236 discloses a kind of MAX phase is etched by transition metal bromide or transition metal iodide molten salt to prepare MXene whose surface functional group is Br or I, and patent CN109437177 discloses that by transition metal chloride molten salt The method of etching and preparing MXene whose surface functional group is Cl; these two methods need to be carried out at a high temperature above 400 degrees and under an inert gas protection atmosphere, and have high requirements for production equipment and environmental protection and safety

Method used

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  • Two-dimensional transition metal carbonitride as well as preparation method and application thereof
  • Two-dimensional transition metal carbonitride as well as preparation method and application thereof
  • Two-dimensional transition metal carbonitride as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1 g MAX phase material Ti 3 AlC 2 Adding 40ml mass fraction is 40wt% HBF 4In the aqueous solution, stir at 80° C. at a speed of 400 rpm for 24 hours, then repeatedly centrifuge and wash with water until the pH of the solution is greater than 5, and obtain an etching product;

[0037] Subsequently, the etching product was added to 10 mL of tetramethylammonium hydroxide (TMAOH) aqueous solution (25 wt %), stirred at 25 °C at a speed of 500 rpm for 24 h, then repeatedly washed with water until the pH of the solution was less than 9, and 100 g of water was added Afterwards, Ti was stably dispersed in water by shaking by hand. 3 C 2 T s ; take the upper black uniform liquid vacuum filtration, after natural air-drying, separate from the filter membrane to obtain Ti 3 C 2 T s film.

[0038] During the reaction Ti 3 AlC 2 and HBF 4 The intermediate etching product (80°-HBF 4 ) XRD spectrum and Ti obtained after TMAOH post-treatment 3 C 2 T s The XRD spectrum of t...

Embodiment 2

[0042] Same as Example 1, but HBF 4 The temperature of the aqueous solution is changed to 50°C, and the other steps are the same, and a stable dispersed two-dimensional Ti can also be obtained. 3 C 2 T s Dispersion, the dispersion is freeze-dried to obtain Ti 3 C 2 T s Powder; the dispersion can be obtained by suction filtration 3 C 2 T s film. HBF in this example 4 Material after aqueous treatment (50°-HBF 4 ) XRD patterns and freeze-dried Ti 3 C 2 T s The XRD spectrum of the powder is shown in Figure 4 . Ti 3 C 2 T s The scanning electron microscope image of the thin film is shown in Figure 5 . From the obtained XRD spectra, SEM images and the fact that a black dispersion liquid stably dispersed in water can be obtained, it can be confirmed that the two-dimensional Ti 3 C 2 T s Material.

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Abstract

The invention discloses a two-dimensional transition metal carbonitride and a preparation method and application thereof, and belongs to the technical field of two-dimensional materials. The method comprises the following steps: adding an MAX phase material into a fluoroboric acid aqueous solution for normal-pressure etching; then washing and adding the MXene into an aqueous solution of tetraalkylammonium hydroxide for post-treatment, then washing a treatment product to obtain a two-dimensional transition metal carbonitride (MXene) material; and dispersing the material into water through handcranking, oscillation, stirring, high-speed dispersion or ultrasonic dispersion to form a stable dispersion liquid. According to the method, without use of hydrofluoric acid, the method is safer and more environmentally friendly compared with hydrofluoric acid etching; and the obtained MXene material has good application in the fields of supercapacitors, lithium ion batteries, electromagnetic shielding and electro-catalysis.

Description

technical field [0001] The invention belongs to the technical field of two-dimensional materials, and in particular relates to a two-dimensional transition metal carbonitride and its preparation method and application. Background technique [0002] Since the discovery of graphene in 2004, two-dimensional materials have become a research hotspot in academia due to their large specific surface area, unique electronic structure, and high aspect ratio. Two-dimensional transition metal carbonitride (MXene), as a new type of two-dimensional transition metal carbonitride material, has both metal conductivity and surface hydrophilicity. It is only a few atoms thick, but its surface has many active sites and is conductive. Excellent performance, has excellent application prospects in supercapacitors, lithium-ion batteries, lithium-sulfur batteries, electromagnetic shielding, conductive printing, electrocatalysis and adsorption, and is considered to be one of the most potential two-di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/921C01B32/90C01B21/076B01J27/24B01J37/06
CPCB01J27/24B01J35/0033B01J37/06C01B21/076C01B21/0768C01P2006/40C01B32/90C01B32/921
Inventor 王利魁刘竞石刚姚伯龙张佳瑜
Owner JIANGNAN UNIV
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