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Porous molybdenum carbide and preparation method and application thereof

A technology of molybdenum carbide and molybdenum source, applied in the field of nanomaterials, can solve problems such as complex reaction process, and achieve the effects of good repeatability, convenient operation and simple process

Active Publication Date: 2022-07-29
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method requires hydrothermal reaction and then calcination, the reaction process is complicated, and the mixture of molybdenum carbide and molybdenum oxide is prepared

Method used

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  • Porous molybdenum carbide and preparation method and application thereof
  • Porous molybdenum carbide and preparation method and application thereof
  • Porous molybdenum carbide and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add a small amount of water to dissolve the untreated ammonium molybdate and magnesium chloride (the molar ratio of molybdenum and copper is 1:1), then mix the two solutions evenly, pre-freeze at -40 °C for 3 hours, and then vacuum to below 50pa, Freeze-dry for 12h, put the freeze-dried sample into one side of the effective heating area in the quartz tube in the tube furnace, then pass methane gas, heat up quickly to 1000 °C, and then move the molybdenum source and magnesium source mixture to the tube In the effective heating area in the furnace, the reaction is carried out in a heat preservation state for 10 minutes, cooled to room temperature after the reaction, and washed with 0.5mol / L hydrochloric acid to remove magnesium to obtain porous molybdenum carbide.

[0037] According to the X-ray diffraction pattern (XRD) results ( figure 1 ) characterizes the product obtained in this example as molybdenum carbide.

[0038] Transmission Electron Microscopy (TEM) as figu...

Embodiment 2

[0040] Porous molybdenum carbide prepared according to the method in Example 1. The difference is that the reaction temperature is 1200°C. After the reaction, the tube furnace is closed, cooled to room temperature, and after the magnesium element is removed by acid washing, porous molybdenum carbide is obtained.

[0041] The product obtained in this example is similar to the result of Example 1, and porous molybdenum carbide is also prepared.

Embodiment 3

[0043] Porous molybdenum carbide prepared according to the method in Example 1. The difference is that the reaction temperature is 900°C. After the reaction, the tube furnace is closed, cooled to room temperature, and after the magnesium element is removed by acid washing, porous molybdenum carbide is obtained.

[0044] The product obtained in this example is similar to the result of Example 1, and porous molybdenum carbide is also prepared.

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Abstract

The invention discloses porous molybdenum carbide and a preparation method and application thereof. The preparation method of the porous molybdenum carbide comprises the following steps: respectively dissolving a molybdenum source and a magnesium source with water, then uniformly mixing, and freeze-drying to obtain a freeze-dried substance; and placing the freeze-dried substance in an environment full of carrier gas, heating, carrying out a reaction in a heat preservation state, cooling to room temperature after the reaction, and carrying out acid pickling to obtain the porous molybdenum carbide. The method has the advantages that the method is simple and convenient to operate, low in control precision, good in repeatability and high in efficiency, and high-volume porous molybdenum carbide can be prepared by reducing molybdenum salt, fixing molybdenum oxide at high temperature by magnesium elements, preventing high-temperature sublimation of molybdenum oxide, carbonizing methane at high temperature and removing the magnesium elements after carbonization.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a porous molybdenum carbide and a preparation method and application thereof. Background technique [0002] Efficient technologies for developing clean and sustainable hydrogen energy have been of constant interest. To this end, an efficient method is based on the electrolysis of water to produce hydrogen. Platinum (Pt)-based materials possess excellent electrocatalytic activity and stability, but their widespread application is hindered by their extremely small amounts in nature and their high price. Nanostructured transition metal catalysts are widely studied as the most promising alternative materials for noble metal platinum due to their low price, good electrocatalytic activity and good stability. However, to date, developing catalysts composed of inexpensive and earth-abundant elements and developing highly active catalysts for water electrolysis for hydrogen produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/949C25B11/075C25B1/04
CPCC01B32/949C25B11/075C25B1/04Y02E60/36
Inventor 贾进邓允锲赵莉莉周伟家
Owner UNIV OF JINAN
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