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Nitrogen-doped and carbon-coated molybdenum carbide as well as preparation method and application thereof

A technology of carbon-coated molybdenum carbide and nitrogen doping, which is applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., to achieve the effects of simple and controllable process, stable performance and novel structure

Active Publication Date: 2019-04-26
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation of carbon-coated nanomolybdenum carbide electrocatalysts is still a big challenge.

Method used

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  • Nitrogen-doped and carbon-coated molybdenum carbide as well as preparation method and application thereof
  • Nitrogen-doped and carbon-coated molybdenum carbide as well as preparation method and application thereof
  • Nitrogen-doped and carbon-coated molybdenum carbide as well as preparation method and application thereof

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Experimental program
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Embodiment 1

[0043] A method for preparing nano-molybdenum carbide coated with nitrogen-doped carbon in this embodiment, the specific preparation steps are as follows:

[0044] Dissolve 12.2g of soluble sodium molybdate in deionized water, then add 12.2g of diammonium hydrogen citrate, add 3.7g of hydrazine hydrochloride after the dissolution is complete, then adjust the pH of the above solution to 6.0 with ammonia water, and react the above solution at 40°C 6h, then stirred and evaporated to dryness at 70°C for 12 hours to obtain a gel, and then dehydrated the gel at 120°C for 12 hours to obtain a xerogel. Grind the xerogel evenly, put it into a tube furnace for carbon reduction at 600°C for 2 hours, and inject 5% (v / v) H 2 H 2 / Ar mixed gas, the target product nitrogen-doped carbon-coated nano-molybdenum carbide can be obtained after the reaction.

[0045] The XRD figure of the nano-molybdenum carbide coated with nitrogen-doped carbon obtained in the present embodiment is as follows f...

Embodiment 2

[0047] A method for preparing nano-molybdenum carbide coated with nitrogen-doped carbon in this embodiment, the specific preparation steps are as follows:

[0048] Dissolve 12.2g of soluble ammonium molybdate in deionized water, then add 12.2g of diammonium hydrogen citrate, add 3.7g of hydrazine hydrochloride after the dissolution is complete, then adjust the pH of the above solution to 6.5 with ammonia water, and react the above solution at 40°C 4h, then stirred and evaporated to dryness at 70°C for 12 hours to obtain a gel, and then dehydrated the gel at 140°C for 12 hours to obtain a xerogel. Grind the xerogel evenly, put it in a tube furnace for carbon reduction at 700°C for 2 hours, and pass 5% (v / v) H 2 H 2 / Ar mixed gas, the target product nitrogen-doped carbon-coated nano-molybdenum carbide can be obtained after the reaction.

[0049] The XRD figure of the nano-molybdenum carbide coated with nitrogen-doped carbon obtained in the present embodiment is as follows fi...

Embodiment 3

[0051] A method for preparing nano-molybdenum carbide coated with nitrogen-doped carbon in this embodiment, the specific preparation steps are as follows:

[0052] Dissolve 12.2g of soluble ammonium molybdate in deionized water, then add 24.4g of diammonium hydrogen citrate, add 5.4g of hydrazine hydrochloride after the dissolution is complete, then adjust the pH of the above solution to 6.5 with ammonia water, and react the above solution at 40°C 4h, then stirred and evaporated to dryness at 80°C for 12 hours to obtain a gel, and then dehydrated the gel at 160°C for 12 hours to obtain a xerogel, ground the xerogel evenly, put it into a tube furnace at 800°C for carbon reduction 4 Hours, during the reaction, 10% (v / v) H 2 H 2 / Ar mixed gas, the target product nitrogen-doped carbon-coated nano-molybdenum carbide can be obtained after the reaction.

[0053] The XRD figure of the nano-molybdenum carbide coated with nitrogen-doped carbon obtained in the present embodiment is as ...

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Abstract

The invention belongs to the technical field of nano material preparation and discloses nitrogen-doped and carbon-coated molybdenum carbide as well as a preparation method and an application thereof.Diammonium hydrogen citrate is used as a complexing agent and a carbon source, soluble molybdenum salt is used as a molybdenum source, hydrazine hydrochloride is used as a coordination aid, molybdenum / diammonium hydrogen citrate gel is firstly prepared with a sol-gel method, and then, nitrogen-doped and carbon-coated nano molybdenum carbide is obtained through high-temperature carbonization and reduction in an argon atmosphere. Atomic-scale mixing of molybdenum elements and carbon elements can be realized with the sol-gel method, so that agglomeration and growth of molybdenum carbide nanoparticles during high-temperature reduction reactions can be inhibited, and a nitrogen-doped and carbon-coated nano molybdenum carbide electrocatalytic material with uniform structure and distribution is obtained and has excellent performance of electrocatalytic decomposition of water for hydrogen production.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to nitrogen-doped carbon-coated molybdenum carbide and its preparation method and application. Background technique [0002] The large-scale production of hydrogen by electrochemical methods has the advantages of low energy consumption, high purity, and environmental friendliness, so it has broad application prospects. Currently, the noble metal platinum (Pt) is the best electrocatalytic hydrogen evolution (HER) catalyst, but its high cost and instability in electrolytic hydrogen production devices are still the main challenges for using Pt catalysts. Therefore, the development of electrocatalysts to replace Pt is still at the forefront of technological research. In recent years, researchers at home and abroad have carried out a large number of related studies on electrocatalysts composed of transition metal bases (Ni, Fe, Co, W, Mo, etc.). In order to ...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/02C25B1/04C25B11/06
CPCC25B1/04C25B11/04B01J27/24B01J35/33B01J35/396B01J35/40Y02E60/36
Inventor 方岳平周训富蔡欣
Owner SOUTH CHINA AGRI UNIV
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