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Preparation method of two-dimensional crystal Nb2CTx nano material

A nanomaterial, two-dimensional crystal technology, applied in nanotechnology, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of high risk, difficult to store, strong irritation of hydrofluoric acid, etc. Gentle process, environmentally friendly results

Pending Publication Date: 2019-06-07
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the main preparation method of MXene is to etch the MAX phase by hydrofluoric acid, but hydrofluoric acid has many disadvantages such as strong irritation, difficulty in storage, and high risk.
On the other hand, Ti 3 C 2 It is currently the most widely studied and mature MXene phase, while the intercalation and layering mechanisms of other materials, including how to prepare high-performance single-layer MXene sheets and nanotubes, and expanding MXene members still need a lot of time and effort

Method used

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  • Preparation method of two-dimensional crystal Nb2CTx nano material
  • Preparation method of two-dimensional crystal Nb2CTx nano material

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Weigh 1gLiF into the corrosion bottle, measure 10mL 12mol / L hydrochloric acid, pour it into the corrosion bottle, and then add 1g Nb 2 Slowly add the AlC raw material into it, and after the reaction is stable, place it under magnetic stirring at 50°C for 72 hours, wash and centrifuge the product repeatedly with deionized water until the pH value is greater than or equal to 5, ultrasonically disperse for 1 hour, and add 5mL~100mL of water to obtain a concentration of 1 ~30mg / mL of Nb 2 CT x solution, centrifuged and filtered to obtain a monolayer of Nb 2 CT x Thin film material, take bottom solid and dry, obtain described multi-layer two-dimensional crystal Nb 2 C nanomaterials, measuring 2D crystalline Nb 2 CT x The electrical conductivity is 500~3000S / cm.

Embodiment 2

[0024] Weigh 0.99g LiF into the corrosion bottle, measure 10mL 9mol / L hydrochloric acid, pour it into the corrosion bottle, and then add 1g Nb 2 Slowly add the AlC raw material into it, and after the reaction is stable, place it under magnetic stirring at 50°C for 72 hours, wash and centrifuge the product repeatedly with deionized water until the pH value is greater than or equal to 5, ultrasonically disperse for 1 hour, and add 5mL~100mL of water to obtain a concentration of 0.1 ~30mg / mL of Nb 2 CT x solution, centrifuged and filtered to obtain a monolayer of Nb 2 CT x Thin film material, take bottom solid and dry, obtain described multi-layer two-dimensional crystal Nb 2 CT x Nanomaterials, measuring 2D crystalline Nb 2 CT x The electrical conductivity is 2000~4000S / cm.

[0025] figure 1 two-dimensional crystal Nb 2 CT x Aqueous solutions of nanomaterials and Tyndall phenomenon;

[0026] figure 2 For the two-dimensional nanolayered crystal Nb 2 CT x Prepared ...

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Abstract

The invention provides a preparation method of a two-dimensional crystal Nb2CTx nano material. The preparation method comprises the following steps: adding 1g of sieved ternary layered Nb2AlC ceramicpowder into a mixed solution of 5-25ml of hydrochloric acid and 0.2-2g of lithium fluoride; adding a magnetic rotor and heating and stirring the solution for a period of time in an oil bath; washing the solution with deionized water and centrifuging the solution, and repeating the operations for multiple times until the pH value is greater than 5; ultrasonically layering the solution by utilizingan ultrasonic cleaning machine, centrifuging the solution, taking an upper-layer turbid liquid, and carrying out suction filtration to obtain the single-layer two-dimensional crystal Nb2CTx nano material; drying the bottom-layer solid to obtain the multilayer two-dimensional crystal Nb2CTx nano material. The MAX phase is etched by using hydrofluoric acid and hydrochloric acid, the preparation method is simple, the reaction process is milder, the environment is protected, and the prepared MXene nano material has an obvious graphene-like two-dimensional layered structure and is expected to be applied to the fields of supercapacitors, lithium ion batteries, adsorption and the like.

Description

technical field [0001] The invention belongs to the technical field of new material preparation, in particular to a two-dimensional crystal compound Nb 2 C and its preparation method and use. Background technique [0002] With economic development and social progress, the development and utilization of new energy plays an important role in solving severe environmental problems. As secondary energy storage devices, supercapacitors and lithium-ion batteries have high power density, long cycle life, and light environmental pollution. advantage. In recent years, with the discovery of graphene and its unique physical and chemical properties, there has been an upsurge in the study of two-dimensional crystals. Two-dimensional layered nano-compounds are materials with a graphene-like structure. Due to their high specific surface area, they have a variety of excellent properties. In addition to graphene, there are also transition metal dichalcogenides and metal oxides. In recent y...

Claims

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Application Information

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IPC IPC(8): C01B32/914B82Y40/00
Inventor 应国兵马凤辰张晨宿琳刘璐张凯城
Owner HOHAI UNIV
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