Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Molybdenum disulfide-based nanometer material for efficiently producing hydrogen by decomposing water through photocatalysis and preparation method thereof

A molybdenum disulfide-based, nanomaterial technology, which is applied in the field of catalysis, can solve the problems of limited research on precious metal nanoparticles/molybdenum disulfide composite materials, independent light absorption and interface engineering, and difficulty in improving at the same time, so as to achieve wide application of propulsion technology. , the effect of promoting electron transfer and low cost

Active Publication Date: 2018-08-24
NORTHWESTERN POLYTECHNICAL UNIV
View PDF4 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The photocatalytic performance can be improved by forming P-type semiconductors and N-type semiconductors into heterojunctions and introducing metal nanoplasmons to form composite nanomaterials. However, light absorption and interface engineering are generally relatively independent and difficult to improve simultaneously.
For example, noble metal nanoparticles / molybdenum disulfide composites, loaded noble metal nanomaterials can enhance the visible light absorption of the material through the plasmon resonance effect, (Qi K, Yu S, Wang Q, et al. Decoration of the inert basal plane of defect-rich MoS2 with Pd atoms for achieving Pt-similar HER activity[J].Journal of Materials Chemistry A,2016;4(11):4025-4031.) However, the recombination of photogenerated carriers is still serious, and the cost of noble metals in composite materials is high
Therefore, the research on noble metal nanoparticles / molybdenum disulfide composites is limited.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Molybdenum disulfide-based nanometer material for efficiently producing hydrogen by decomposing water through photocatalysis and preparation method thereof
  • Molybdenum disulfide-based nanometer material for efficiently producing hydrogen by decomposing water through photocatalysis and preparation method thereof
  • Molybdenum disulfide-based nanometer material for efficiently producing hydrogen by decomposing water through photocatalysis and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Polyvinyl alcohol (7wt%) was dissolved in dimethylformamide and stirred overnight at 60°C, and then 1.5g of ammonium molybdate was added to obtain a uniform electrospinning solution. A syringe with a needle tip diameter of 0.5mm and a volume of 20ml was used, the electric field voltage was set to 16KV, and the flow rate was controlled at 0.7ml / h for electrospinning, and then calcined in air at 280°C for 3h to obtain molybdenum trioxide nanomaterials. Take 2.0mmol sodium molybdate and 4.0mmol cysteine ​​dissolved in deionized water to obtain solution A, take 0.5g of molybdenum oxide nanomaterials dissolved in deionized water to obtain solution B, add solution B drop by drop to solution A and ultrasonically 20min, and then carry out a hydrothermal reaction at 180°C for 12h. After the reaction is finished, it is centrifuged and washed at 4500 rpm, and then dried at 65° C. to obtain a molybdenum disulfide / molybdenum trioxide nanocomposite material.

[0021] Characterizatio...

Embodiment 2

[0023] Polyvinyl alcohol (7wt%) was dissolved in dimethylformamide and stirred overnight at 55°C, and then 2g of ammonium molybdate was added to obtain a homogeneous electrospinning solution. A syringe with a needle tip diameter of 0.5mm and a volume of 20ml was used, the electric field voltage was set to 17KV, and the flow rate was controlled at 0.8ml / h for electrospinning, and then calcined in air at 300°C for 2h to obtain molybdenum trioxide nanomaterials. Take 2.5mmol sodium molybdate and 4.0mmol cysteine ​​dissolved in deionized water to obtain solution A, take 0.6g of molybdenum oxide nanomaterials dissolved in deionized water to obtain solution B, add solution B drop by drop to solution A and sonicate 25min, and then conduct a hydrothermal reaction at 190°C for 9h. After the reaction is finished, it is centrifuged and washed at 5000 rpm, and then dried at 60° C. to obtain a molybdenum disulfide / molybdenum trioxide nanocomposite material.

[0024] Characterization: Take...

Embodiment 3

[0026] Polyvinyl alcohol (7wt%) was dissolved in dimethylformamide and stirred overnight at 65°C, and then 1 g of ammonium molybdate was added to obtain a uniform electrospinning solution. A syringe with a needle tip diameter of 0.5mm and a volume of 20ml was used, the electric field voltage was set to 17KV, and the flow rate was controlled at 0.9ml / h for electrospinning, and then calcined in air at 320°C for 1.5h to obtain molybdenum trioxide nanomaterials. Take 3.0mmol sodium molybdate and 4.5mmol cysteine ​​dissolved in deionized water to obtain solution A, take 0.8g of molybdenum oxide nanomaterials dissolved in deionized water to obtain solution B, add solution B drop by drop to solution A and sonicate 30min, and then carry out a hydrothermal reaction at 200°C for 16h. After the reaction is finished, it is centrifuged and washed at 5500 rpm, and then dried at 70° C. to obtain a molybdenum disulfide / molybdenum trioxide nanocomposite material.

[0027] Characterization: Ta...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a molybdenum disulfide-based nanometer material for efficiently producing hydrogen by decomposing water through photocatalysis and a preparation method thereof. The material is structurally characterized in that molybdenum trioxide is used as a core; molybdenum disulfide is used as a shell. Nonmetal semiconductors of molybdenum trioxide are added; the absorption range of visible light can be expanded through the plasmons effects; in addition, through the energy level structure of the molybdenum trioxide, the regulation and control can be realized through hydrogen ion doping, so that the better energy level matching with the molybdenum disulfide to promote photoproduction exciton separation can be thus realized; more importantly, an interface of molybdenum disulfideand molybdenum trioxide can be effectively regulated and controlled; the electron transfer can be promoted. Meanwhile, the preparation process is simple and convenient; the cost is low; the wide application of the hydrogen production by decomposing water through photocatalysis can be further promoted.

Description

technical field [0001] The invention belongs to the field of catalysis, and relates to a molybdenum disulfide-based high-efficiency photocatalytic decomposition of water to produce hydrogen and a preparation method. Background technique [0002] Photocatalytic hydrogen production technology can well deal with the current energy crisis and environmental pollution problems, and it is a technology with great development potential. At present, molybdenum disulfide and its composite materials have been extensively studied in the field of photocatalytic hydrogen production. In the photocatalytic process, semiconductors absorb light to generate excitons, which are subsequently separated at the interface. Light absorption and interface engineering are two key factors for materials to exhibit high photocatalytic performance. The photocatalytic performance can be improved by forming P-type semiconductors and N-type semiconductors into heterojunctions and introducing metal nanoplasmo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/051B01J37/34B01J37/08B01J37/10B82Y30/00B82Y40/00C01B3/04
CPCB82Y30/00B82Y40/00C01B3/042B01J27/051B01J37/088B01J37/10B01J37/341B01J37/343C01B2203/1088C01B2203/0277B01J35/397B01J35/39Y02E60/36
Inventor 李炫华郭绍晖宋亚茹杨琳
Owner NORTHWESTERN POLYTECHNICAL UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com