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A kind of molybdenum dioxide-molybdenum carbide composite material and its preparation method and application

A molybdenum dioxide and composite material technology, applied in the direction of carbides and carbides of molybdenum oxide/molybdenum hydroxide, tungsten/molybdenum, etc., can solve the problems of complex preparation process of composite materials, complex preparation process and difficult industrial application, etc. Achieve the effects of excellent catalytic activity, simple preparation process and short production cycle

Active Publication Date: 2022-07-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, existing molybdenum-based materials generally have problems such as complex preparation process, low yield, high energy consumption, and environmental pollution during the preparation process, making it difficult to truly realize large-scale industrial applications. For example: CN109499592 A discloses a nanorod molybdenum carbide / Molybdenum dioxide composite material is obtained by mixing ammonium molybdate solution and tannic acid solution and then performing high-temperature heat treatment at 800°C to 900°C. The nanorod molybdenum carbide / molybdenum dioxide composite material can be used in the field of catalysis. However, it requires high-temperature heat treatment during the preparation process, which requires high energy consumption and produces waste liquid, which requires subsequent harmless treatment; Gao et al. used oxygen plasma to treat Mo 2 C, in situ generation of MoO on its surface x , got Mo 2 C / MoO x The composite material with heterogeneous structure shows excellent catalytic performance in the test of electrocatalytic hydrolysis, but due to the complex preparation process and low yield of the composite material, it is difficult to realize industrial application (Angew.Chem.Int.Ed. 2020, 59, 3544-3548)

Method used

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  • A kind of molybdenum dioxide-molybdenum carbide composite material and its preparation method and application
  • A kind of molybdenum dioxide-molybdenum carbide composite material and its preparation method and application
  • A kind of molybdenum dioxide-molybdenum carbide composite material and its preparation method and application

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Embodiment 1

[0034] A molybdenum dioxide-molybdenum carbide composite material, the preparation method comprising the following steps:

[0035] Fill the glove box with argon until the pressure in the glove box is 0.1 MPa, and then put molybdenum dioxide, magnesium powder and melamine in the glove box according to the molar ratio of 1:6:0.3 and put them into the ball mill tank, and according to the ball-to-material ratio of 50 : 1 Add the ball milling medium, then add the ball milling tank to the high-energy pendulum ball mill, adjust the ball mill speed to 1230 rpm, ball mill in an argon atmosphere for 2 hours, and then add the ball mill product to a concentration of 1mol / L hydrochloric acid solution, stir, centrifuge , wash the solid obtained by centrifugation until neutral, and then place it in a drying oven to dry overnight to obtain a molybdenum dioxide-molybdenum carbide composite material.

[0036] Performance Testing:

[0037] 1) The X-ray diffraction (XRD) pattern of the molybdenu...

Embodiment 2

[0042] A molybdenum dioxide-molybdenum carbide composite material, the preparation method comprising the following steps:

[0043] Fill the glove box with argon until the pressure in the glove box is 0.1MPa, and then put molybdenum dioxide, magnesium powder and melamine in the glove box according to the molar ratio of 1:8:0.3 and put them into the ball mill tank, and according to the ball-to-material ratio of 50 : 1 Add the ball milling medium, then add the ball milling tank to the high-energy pendulum ball mill, adjust the ball mill speed to 1100 rpm, ball mill in an argon atmosphere for 2 hours, and then add the ball mill product to a concentration of 1mol / L sulfuric acid solution, stir, centrifuge , wash the solid obtained by centrifugation until neutral, and then place it in a drying oven to dry overnight to obtain a molybdenum dioxide-molybdenum carbide composite material.

[0044] After testing, the molybdenum dioxide-molybdenum carbide composite material of this embodim...

Embodiment 3

[0046] A molybdenum dioxide-molybdenum carbide composite material, the preparation method comprising the following steps:

[0047] Fill the glove box with argon until the pressure in the glove box is 0.1 MPa, and then put molybdenum dioxide, magnesium powder and melamine in the glove box according to the molar ratio of 1:9:0.3 and put them into the ball mill tank, and according to the ball-to-material ratio of 10 : 1 Add the ball milling medium, then add the ball milling tank to the high-energy pendulum ball mill, adjust the ball mill speed to 1000 rpm, ball mill in an argon atmosphere for 2 hours, and then add the ball mill product to a mass fraction of 25% phosphoric acid solution, stir, centrifuge , wash the solid obtained by centrifugation until neutral, and then place it in a drying oven to dry overnight to obtain a molybdenum dioxide-molybdenum carbide composite material.

[0048] After testing, the molybdenum dioxide-molybdenum carbide composite material of this embodim...

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Abstract

The invention discloses a molybdenum dioxide-molybdenum carbide composite material and a preparation method and application thereof. The composition of the molybdenum dioxide-molybdenum carbide composite material of the present invention includes MoO 2 and MoC, and can also include Mo 2 C. The preparation method of the molybdenum dioxide-molybdenum carbide composite material of the present invention comprises the following steps: mixing molybdenum dioxide, magnesium powder and carbonitride, performing solid-phase ball milling, pickling and drying to obtain a molybdenum dioxide-molybdenum carbide composite material Material. The molybdenum dioxide-molybdenum carbide composite material of the present invention has good catalytic activity as a catalyst for electrocatalytic hydrogen evolution reaction, and the preparation method is simple, low in energy consumption and low in cost, and is suitable for large-scale production and application.

Description

technical field [0001] The invention relates to the technical field of heterostructured materials, in particular to a molybdenum dioxide-molybdenum carbide composite material and a preparation method and application thereof. Background technique [0002] Electrocatalytic hydrogen evolution is a method for preparing hydrogen by electrolysis of water, which has the advantages of clean and pollution-free, but due to the high reaction energy barrier of the water electrolysis reaction, the cost is high. Therefore, the development of efficient and low-cost catalysts for water electrolysis is of great significance for the hydrogen production industry. [0003] Molybdenum-based materials (such as molybdenum carbide, molybdenum dioxide, molybdenum disulfide, etc.) have good catalytic effects as catalysts for water electrolysis, and have received extensive attention from researchers in recent years. However, the existing molybdenum-based materials generally have problems such as comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G39/02C01B32/949C25B1/04C25B11/091
CPCC01G39/02C01B32/949C25B1/04C25B11/091C01P2004/80Y02E60/36
Inventor 欧阳柳章陈沛荣王辉朱敏
Owner SOUTH CHINA UNIV OF TECH