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Molybdenum diselenide/nitrogen-doped carbon composite nano material, and preparation method and application thereof

A composite nanomaterial and nitrogen-doped carbon technology, which is applied in the field of molybdenum diselenide/nitrogen-doped carbon composite nanomaterials and the preparation thereof, can solve the problems of unstable structure, poor conductivity of molybdenum diselenide and the like, and achieves the preparation method. Simple, uniform morphology and size, high yield effect

Active Publication Date: 2019-01-29
LINGNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention provides a method for preparing molybdenum diselenide / nitrogen-doped carbon composite nanomaterials in order to overcome the defects of poor electrical conductivity and unstable structure of molybdenum diselenide described in the prior art. Molybdenum diselenide / nitrogen-doped carbon composite nanomaterials make molybdenum diselenide more conductive and more stable in structure

Method used

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  • Molybdenum diselenide/nitrogen-doped carbon composite nano material, and preparation method and application thereof
  • Molybdenum diselenide/nitrogen-doped carbon composite nano material, and preparation method and application thereof
  • Molybdenum diselenide/nitrogen-doped carbon composite nano material, and preparation method and application thereof

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Experimental program
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Embodiment 1

[0058] S1. Dissolve 3 mmol of selenium powder in 10 mL of hydrazine hydrate to obtain a hydrazine hydrate solution of selenium.

[0059] S2. Dissolve 8.37 mmol of galactosamine in 50 mL of deionized water to form a solution, adjust the pH value of the solution to 5 with concentrated hydrochloric acid, add 1.5 mmol of sodium molybdate under stirring, and then add 10 mL of selenium hydrazine hydrate solution. After all dissolved, the molar ratio of galactosamine and sodium molybdate in the solution was 5.6:1, the molar ratio of selenium and sodium molybdate was 2:1, and the concentration of galactosamine was 0.14 mol / L.

[0060] S3. Transfer the solution obtained in step S2. to a 100 mL stainless steel reactor lined with polytetrafluoroethylene. Placed in a dry box, hydrothermally reacted at 240°C for 24 hours. Then cool naturally to room temperature, rinse with deionized water and absolute ethanol three times respectively, centrifuge and vacuum dry at 60°C for 12 hours to obt...

Embodiment 2

[0063] The difference between embodiment 2 and embodiment 1 is that the concentration of galactosamine in the solution of embodiment 2 is 0.28 mol / L;

[0064] Other conditions and operation steps are identical with embodiment 1.

Embodiment 3~7

[0066] The difference between Examples 3-7 and Example 1 is that the mol ratios of galactosamine and sodium molybdate in the solutions of Examples 3-7 are respectively 9.3:1, 3:1, 7:1, 10:1 and 15 : 1, the concentration of galactosamine is 0.23 mol / L;

[0067] Other conditions and operation steps are identical with embodiment 1.

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Abstract

The invention discloses a molybdenum diselenide / nitrogen-doped carbon composite nano material, and a preparation method and application thereof. The preparation method of the molybdenum diselenide / nitrogen-doped carbon composite nano material comprises the following steps: S1, dissolving a selenium source in hydrazine hydrate to obtain a solution A; S2, preparing an acidic galactosamine solution,and adding a molybdenum source to obtain a solution B, wherein the molar ratio of galactose amine to molybdenum atoms in the molybdenum source is (3-15):1; S3, uniformly mixing the solution A and thesolution B, then carrying out a hydrothermal reaction, and carrying out post-treatment to obtain a solid product; and S4, carrying out heat treatment on the solid product in an inert atmosphere to obtain the molybdenum diselenide / nitrogen-doped carbon composite nano material. According to the invention, the galactose amine is used as a carbon source and a nitrogen source, and the molybdenum diselenide / nitrogen-doped carbon composite nano material is prepared by adopting a hydrothermal method and a heat treatment technology. The molybdenum diselenide / nitrogen-doped carbon composite nano material improves conductivity and structural stability of molybdenum diselenide.

Description

technical field [0001] The invention relates to the field of inorganic micro-nano materials, more specifically, to a molybdenum diselenide / nitrogen-doped carbon composite nano-material and its preparation method and application. Background technique [0002] In contemporary society, energy issues have undoubtedly become one of the major global issues and have attracted widespread attention. Finding new materials that can have special effects in energy storage and use has become one of the important tasks of scientists. In terms of lithium-ion battery anode materials, graphite-based carbon materials are still the preferred anode materials for lithium-ion batteries in the future due to their good cycle stability, ideal charge and discharge platform and the highest cost performance. However, the charge-discharge specific capacity of carbon materials is low, and the volume specific capacity has no advantage. Therefore, it is necessary to develop new negative electrode materials ...

Claims

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Application Information

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IPC IPC(8): C01B19/00C01B32/05
CPCC01B19/007C01B32/05C01P2002/72C01P2004/03C01P2006/40
Inventor 马琳许丽梅徐旭耀周晓平唐晓山凌妍
Owner LINGNAN NORMAL UNIV
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