Three-dimensional mesoporous carbon-loaded molybdenum carbide and preparation method and application thereof

A three-dimensional mesoporous and molybdenum carbide technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve problems such as increased d energy band density, and achieve prevention of agglomeration and multiple reactive active sites , the effect of excellent electrocatalytic performance

Active Publication Date: 2019-04-16
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This increase in the metal-to-metal atomic spacing causes the d-band shrinkage of the molybdenum atoms, resulting in an increase in the d-band density of molybdenum

Method used

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  • Three-dimensional mesoporous carbon-loaded molybdenum carbide and preparation method and application thereof
  • Three-dimensional mesoporous carbon-loaded molybdenum carbide and preparation method and application thereof
  • Three-dimensional mesoporous carbon-loaded molybdenum carbide and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A preparation method of a three-dimensional mesoporous carbon-supported molybdenum carbide in this embodiment, the specific preparation steps are as follows:

[0050] Dissolve 6.0 g of soluble ammonium molybdate in deionized water, then add 15.0 g of diammonium hydrogen citrate, and add 40 g of silicon dioxide dispersion (silicon dioxide content 40wt%, silicon dioxide particle size 15 ± 5nm) after the dissolution is complete , then use ammonia water to adjust the pH of the above solution to 6.0, then stir and evaporate to dryness at 70°C for 12 hours to obtain a gel, then dehydrate the gel at 200°C for 12 hours to obtain a xerogel, grind the xerogel evenly, and put Put into a tube furnace at 900°C for carbon reduction for 2 hours, and feed 5% (v / v) H during the reaction process 2 / Ar mixed gas, soak and stir with excess 4.0wt% hydrofluoric acid for 4 hours after the reaction, filter, and dry naturally to obtain the target product three-dimensional mesoporous carbon-supp...

Embodiment 2

[0054] A preparation method of a three-dimensional mesoporous carbon-supported molybdenum carbide in this embodiment, the specific preparation steps are as follows:

[0055] Soluble sodium molybdate 6.0g is dissolved in deionized water, then add 20.0g cyanamide, add 40g silicon dioxide dispersion liquid (40wt% of silicon dioxide content, silicon dioxide particle diameter 15 ± 5nm) after dissolving completely, use Adjust the pH of the above solution to 7 with nitric acid, then stir and evaporate to dryness at 70°C for 12 hours to obtain a gel, then put the gel into a tube furnace for carbonization and reduction at 700°C for 2 hours, and feed 5% (v / v) H 2 / Ar mixed gas, soak and stir with excess 2.0wt% hydrofluoric acid for 8 hours after the reaction, filter, and dry naturally to obtain the target product three-dimensional mesoporous carbon-supported molybdenum carbide.

[0056] The XRD pattern of the three-dimensional mesoporous carbon supported molybdenum carbide obtained in...

Embodiment 3

[0059] A preparation method of a three-dimensional mesoporous carbon-supported molybdenum carbide in this embodiment, the specific preparation steps are as follows:

[0060] Dissolve 6.0 g of soluble ammonium molybdate in deionized water, then add 18.0 g of dicyandiamide, and add 40 g of silica dispersion (40 wt % silica content, 15 ± 5 nm in silica particle size) after dissolving completely, Use nitric acid to adjust the pH of the above solution to 4.5, then stir and evaporate to dryness at 80°C for 12 hours to obtain a gel, then dehydrate the gel at 180°C for 12 hours to obtain a xerogel, grind the xerogel evenly, and put it in a tube 900°C carbonization and reduction in a type furnace for 2 hours, and 10% (v / v) H was introduced during the reaction. 2 / Ar mixed gas, soak and stir with excess 4.0wt% hydrofluoric acid for 2 hours after the reaction, filter, and dry naturally to obtain the target product three-dimensional mesoporous carbon-supported molybdenum carbide.

[0061...

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Abstract

The invention belongs to the field of preparation of nanomaterials and discloses three-dimensional mesoporous carbon-loaded molybdenum carbide and a preparation method and application thereof. The preparation method comprises the following steps of dissolving a soluble molybdenum salt in water, adding an organic carbon source and a template agent, adjusting the pH value of the solution to be 0-7.0, stirring and evaporating the solution to obtain gel, further dehydrating the gel to obtain xerogel, and calcining the xerogel at the high temperature in the atmosphere of inert gas or reducing gas;carbonizing the organic carbon source to obtain carbon, reducing and carbonizing molybdenum through reducing substances generated in the carbonization process of the organic carbon source to obtain nano molybdenum carbide, soaking nano molybdenum carbide in dilute acid to remove impurities, and then obtaining a target product. Compared with a bulk molybdenum carbide material, the three-dimensionalmesoporous carbon-loaded molybdenum carbide has the advantages that a conductive three-dimensional carbon network structure is obtained, the specific surface area is greater, more reactive sites aregenerated, a carbon-loaded structure prevents molybdenum carbide from agglomerating during high-temperature calcination, and therefore three-dimensional mesoporous carbon-loaded molybdenum carbide hasexcellent electrocatalytic performance.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a three-dimensional mesoporous carbon-supported molybdenum carbide and its preparation method and application. Background technique [0002] With the development of hydrogen production technology by electrolysis of water, the demand for electrode catalysts used in low-cost and high-efficiency electrolysis of water for hydrogen production is becoming more and more obvious. Due to the high cost and low reserves of precious metals such as Pt as catalysts for electrolysis of water, the development of a new type of non-precious metal catalyst has become a research hotspot. Among them, transition metal carbides have attracted extensive attention in the process of electrolysis of water. focus on. Transition metal carbides are formed by embedding carbon atoms in the transition metal lattice and forming chemical bonds. Transition metal carbides can exhibit v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/22C25B1/04C25B11/06
CPCB01J27/22B01J35/0033C25B1/04C25B11/04Y02E60/36
Inventor 方岳平周训富蔡欣
Owner SOUTH CHINA AGRI UNIV
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