Preparation method of two-dimensional molybdenum carbide/graphene nanosheet composite material

A technology of graphene nanosheets and composite materials, which is applied in the field of preparation of two-dimensional molybdenum carbide/graphene nanosheet composite materials, achieving the effects of easy control of process parameters, convenient operation, and reduced preparation costs

Active Publication Date: 2019-12-17
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for preparing a two-dimensional molybdenum carbide / graphene nanosheet composite material, which is prepared by a simple method to obtain a two-dimensional molybdenum carbide / graphene nanosheet composite material to solve the problem that the molybdenum carbide active site is less exposed , the problem of low activity, improve the catalytic performance of molybdenum carbide materials

Method used

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  • Preparation method of two-dimensional molybdenum carbide/graphene nanosheet composite material
  • Preparation method of two-dimensional molybdenum carbide/graphene nanosheet composite material

Examples

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Effect test

Embodiment 1

[0025] Weigh 1.23g of ammonium molybdate and add it into 40mL of distilled water, fully dissolve to form a uniform aqueous solution.

[0026] Dissolve 1.3 g of cetyltrimethylammonium bromide (CTAB) in 10 mL of ethanol, add 5 mL of 4.2 g / L graphene oxide ethanol dispersion, and ultrasonically disperse for 30 min to form an ethanol dispersion.

[0027] Pour the above ethanol dispersion into the aqueous solution, stir well for 0.5h, transfer to the reaction kettle, seal it, heat to 120°C for hydrothermal reaction for 12h, take out the product, wash with distilled water, and centrifugally dry, repeat the treatment 1-2 times.

[0028] The washed and dried product was heated at 800° C. for 2 h in an air atmosphere to prepare a two-dimensional molybdenum carbide / graphene nanosheet composite material.

[0029] figure 1 The XRD pattern of the two-dimensional structured molybdenum carbide / graphene nanosheet composite prepared above is given. Comparing it with the standard spectrum of ...

Embodiment 2

[0033] Weigh 1.23g of ammonium molybdate and add it into 40mL of distilled water, fully dissolve to form a uniform aqueous solution.

[0034] Dissolve 0.2 g of cetyltrimethylammonium bromide (CTAB) in 15 mL of ethanol, add 21 mg of graphene oxide, and ultrasonically disperse for 30 min to obtain an ethanol dispersion.

[0035] Pour the above ethanol dispersion into the aqueous solution, stir well for 0.5h, transfer to the reaction kettle, seal it, heat to 120°C for hydrothermal reaction for 12h, take out the product, wash with distilled water, and centrifugally dry, repeat the treatment 1-2 times.

[0036] The washed and dried product was heated at 800° C. for 2 h in an air atmosphere to prepare a two-dimensional molybdenum carbide / graphene nanosheet composite material.

[0037] The composite material prepared above is used as the cathode material, coated on the surface of the electrode, and exhibits high electrocatalytic activity in the hydrogen evolution reaction of electrol...

Embodiment 3

[0039] Weigh 1.23g of ammonium molybdate and add it into 25mL of distilled water, fully dissolve to form a uniform aqueous solution.

[0040] Dissolve 1.0 g of cetyltrimethylammonium bromide (CTAB) in 10 mL of ethanol, add 5 mL of 4.2 g / L graphene oxide ethanol dispersion, and ultrasonically disperse for 30 min to obtain an ethanol dispersion.

[0041] Pour the above ethanol dispersion into the aqueous solution, stir well for 0.5h, transfer to the reaction kettle, seal it, heat to 120°C for hydrothermal reaction for 12h, take out the product, wash with distilled water, and centrifugally dry, repeat the treatment 1-2 times.

[0042] The washed and dried product was heated at 800° C. for 2 h in an air atmosphere to prepare a two-dimensional molybdenum carbide / graphene nanosheet composite material.

[0043] The composite material prepared above is used as the cathode material, coated on the surface of the electrode, and exhibits high electrocatalytic activity in the hydrogen evol...

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Abstract

The invention discloses a preparation method of a two-dimensional molybdenum carbide / graphene nanosheet composite material, wherein the preparation method comprises the steps: adding a graphene oxideethanol dispersion solution dissolved with hexadecyl trimethyl ammonium bromide into a soluble molybdenum source aqueous solution, carrying out a hydrothermal reaction, and carbonizing the reaction product to obtain the two-dimensional molybdenum carbide / graphene nanosheet composite material. The two-dimensional molybdenum carbide / graphene nanosheet composite material is prepared by a simple method, the problems of less exposure of molybdenum carbide active sites and low activity are solved, and the catalytic performance of the molybdenum carbide material is improved. The two-dimensional molybdenum carbide / graphene nanosheet composite material prepared by the method is used as a catalyst material to be applied to water electrolysis hydrogen production reaction, and shows relatively high activity.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and relates to a preparation method of a two-dimensional molybdenum carbide / graphene nano sheet composite material. Background technique [0002] Metal carbides are a new class of functional materials with high hardness, high melting point, good thermal stability and corrosion resistance, and have been applied in many fields. In the 1990s, Ledoux et al. reported that metal carbides have noble metal-like properties and are expected to become a substitute for noble metals and a new type of catalytic material. Among them, molybdenum carbide has attracted widespread attention. [0003] Molybdenum carbide has shown good catalytic performance in catalytic reactions such as cyclohexane dehydrogenation and electrolytic water hydrogen evolution. However, molybdenum carbide itself has the problems of small specific surface area and few active sites, which restrict its full expression of ...

Claims

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Application Information

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IPC IPC(8): B01J27/22B01J37/08C25B1/04C25B11/06
CPCB01J27/22B01J37/0009B01J37/084C25B1/04C25B11/091B01J35/33Y02E60/36
Inventor 杜建平刘璐李生虎杜宇轩商阳阳
Owner TAIYUAN UNIV OF TECH
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