Tungsten disulfide/molybdenum disulfide/ graphene composite material with layered structure and preparation method and application thereof

A molybdenum disulfide, tungsten disulfide technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problems of unsatisfactory catalytic performance, high cost, and cumbersome, and achieve excellent hydrogen evolution catalysis. Performance, high cost, effect of high active surface area

Active Publication Date: 2021-11-09
海科技术创新服务(江苏)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although WS 2 It is a highly active catalyst for stable HER, but further improvement is needed, especially for WS prepared by traditional methods 2 , but the catalytic performance is not ideal. Many researchers improve its catalytic performance by constructing special structures and compounding with other materials.
However, the traditional methods for preparing composite catalysts mainly include step-by-step solvothermal method, CVD method, high-temperature calcination method and other methods and processes, which are costly, complicated and cumbersome.

Method used

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  • Tungsten disulfide/molybdenum disulfide/ graphene composite material with layered structure and preparation method and application thereof
  • Tungsten disulfide/molybdenum disulfide/ graphene composite material with layered structure and preparation method and application thereof
  • Tungsten disulfide/molybdenum disulfide/ graphene composite material with layered structure and preparation method and application thereof

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preparation example Construction

[0095] The present invention also provides a preparation method of tungsten disulfide / molybdenum disulfide / graphene composite material, comprising the following steps:

[0096] 1) After dispersing the molybdenum disulfide powder, the first surfactant and water, a dispersion liquid is obtained, and then centrifuged and ground to obtain molybdenum disulfide micro-nano sheets;

[0097]Dispersing and mixing the expanded graphite, the second surfactant and water to obtain a dispersion, and then centrifuging and grinding to obtain graphene micro-nano sheets;

[0098] After mixing tungsten hexachloride, ammonium tungstate and water, a mixed solution A is obtained;

[0099] 2) After redispersing the molybdenum disulfide micro-nanosheets, graphene micro-nanosheets, sulfur source, third surfactant and water obtained in the above steps, the mixed solution B is obtained;

[0100] 3) Mix the mixed solution B obtained in the above steps with the mixed solution A again, adjust the pH value,...

Embodiment 1

[0141] Add a certain amount of molybdenum disulfide powder and sodium lauryl sulfate into deionized water. The mass ratio of molybdenum disulfide powder and deionized water is 1:100 to form a mixed solution. After ultrasonic dispersion for 120 minutes, a dispersion solution is formed; then First, centrifuge at a low speed of 500rmp / min for 5min, take the upper layer solution, and then centrifuge at a high speed at a rate of 5000r / min for 10min, remove the lower layer solution and wash; then dry and grind in a vacuum drying room at 60°C overnight to form molybdenum disulfide Micro-nanosheets.

[0142] Add a certain amount of expanded graphite and octadecyltrimethylammonium chloride into deionized water, the mass ratio of expanded graphite to deionized water is 1:100 to form a mixed solution, which is dispersed by ultrasonic for 120 minutes to form a dispersion; then First centrifuge at a low speed of 500rmp / min for 5min, take the upper layer solution, and then centrifuge at a h...

Embodiment 2

[0151] Add a certain amount of molybdenum disulfide powder and sodium lauryl sulfate into deionized water. The mass ratio of molybdenum disulfide powder and deionized water is 1:100 to form a mixed solution. After ultrasonic dispersion for 120 minutes, a dispersion solution is formed; then First, centrifuge at a low speed of 500rmp / min for 5min, take the upper layer solution, and then centrifuge at a high speed at a rate of 5000r / min for 10min, remove the lower layer solution and wash; then dry and grind in a vacuum drying room at 60°C overnight to form molybdenum disulfide Micro-nanosheets.

[0152]Add a certain amount of expanded graphite and octadecyltrimethylammonium chloride into deionized water, the mass ratio of expanded graphite to deionized water is 1:100 to form a mixed solution, which is dispersed by ultrasonic for 120 minutes to form a dispersion; then First centrifuge at a low speed of 500rmp / min for 5min, take the upper layer solution, and then centrifuge at a hi...

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Abstract

The invention provides a tungsten disulfide/ molybdenum disulfide/graphene composite material. The composite material has a layered structure. Flaky tungsten disulfide, flaky molybdenum disulfide and graphene sheets are compounded to form a layered structure. According to the tungsten disulfide composite material provided by the invention, tungsten disulfide, molybdenum disulfide and graphene are compounded through electrostatic adsorption, and the composite material has a specific layered structure and can provide more active sites and a higher active surface area, so that the catalytic activity of tungsten disulfide is greatly improved, the HER performance is improved, and the composite material shows excellent catalytic hydrogen evolution performance. The preparation method is simple, mild in condition, easy to operate and low in cost, and commercial application of the tungsten disulfide composite catalyst can be better promoted. The invention not only provides an excellent catalyst for the field of hydrogen evolution, but also provides a new thought for synthesis of a composite two-dimensional catalyst.

Description

technical field [0001] The invention belongs to the technical field of tungsten disulfide HER catalyst materials, and relates to a tungsten disulfide / molybdenum disulfide / graphene composite material and its preparation method and application, especially to a layered structure of tungsten disulfide / molybdenum disulfide / Graphene composite material and its preparation method and application. Background technique [0002] Hydrogen energy is an ideal, clean and efficient secondary energy source. Electrocatalytic and photoelectric catalytic water splitting are one of the important sources of hydrogen, and high-performance electrocatalysts are the core of electrolytic water splitting and photoelectric splitting of water. At present, the widely used catalysts for water electrolysis mainly use noble metal Pt and its alloys as HER catalysts. However, the high cost and resource scarcity of Pt-based HER catalysts severely restrict their wide application as HER catalysts. Searching fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/051C25B1/04C25B11/091
CPCB01J27/051B01J35/0033C25B1/04Y02E60/36
Inventor 杨亚东吴炳辉
Owner 海科技术创新服务(江苏)有限公司
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