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MoSxOy/carbon nanometer composite material, and preparation method and application thereof

一种纳米复合材料、复合材料的技术，应用在纳米碳、燃料电池、收集器/分离器等方向，能够解决复合材料催化性能差距等问题，达到良好催化稳定性、增强催化能力、增加数目的效果

Active Publication Date: 2017-08-04
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in these studies, the catalytic performance of composite materials is still far behind that of platinum-based noble metal catalysts.

Method used

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  • MoSxOy/carbon nanometer composite material, and preparation method and application thereof
  • MoSxOy/carbon nanometer composite material, and preparation method and application thereof
  • MoSxOy/carbon nanometer composite material, and preparation method and application thereof

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preparation example Construction

[0035] The present invention also provides the aforementioned nanocomposite preparation method, wherein the method comprises the following steps:

[0036] (1) Dispersing the carbon source in a solvent, preferably ultrasonically dispersing for 30-100 minutes, to obtain a carbon source dispersion;

[0037] In the specific implementation process of step (1), the proportioning of the carbon source and the solvent is 1-10 mg: 1 mL; the carbon source is preferably selected from carbon black, carbon nanotubes, carbon nanohorns, graphite oxide, sulfonated graphite oxide At least one; the solvent is preferably at least one selected from ethylene glycol, glycerol, water, preferably deionized water; in the specific implementation process, ultrasonic dispersion is more preferably 60-100 minutes; ultrasonic power can be 500 -1200W.

[0038] (2) adding the sulfur source and the molybdenum source to the carbon source dispersion to obtain a mixed solution;

[0039] In the specific implement...

Embodiment 1

[0051] Example 1: MoS x o y / Preparation and application of carbon nanocomposites

[0052] Preparation of MoS x o y / Carbon Nanocomposite

[0053] Disperse 80mg of acetylene black into 20ml of ethylene glycol (4mg / mL), and ultrasonically disperse with an ultrasonic processor for 60 minutes at room temperature (ultrasonic power 650W) to obtain the acetylene black dispersion; subsequently, add 40mg of ammonium tetrathiomolybdate , to obtain the mixed solution; transfer it to a radiant tube, feed high-purity nitrogen for 30 minutes, seal it with a rubber stopper, and place it in 60 Irradiation was carried out at room temperature in a Coγ-ray irradiation device with a dose rate of 50Gy / min and an absorbed dose of 50kGy. After the irradiation, the sample was filtered through a polypropylene (PP) membrane with a pore size of 0.45 μm. The filter cake after filtration is rinsed with ethanol, and then washed with deionized water after filtration. Each time it is washed, it is tr...

Embodiment 2

[0063] Example 2: MoS x o y / Preparation of carbon nanocomposites

[0064] Change the acetylene black in embodiment 1 into carbon nanotubes, and other preparation conditions of the composite material are the same as embodiment 1, and prepare MoS under this condition x o y / Carbon Nanocomposite, MoS x o y The mass percentage in the composite material is 17%, x is 2.91, and y is 0.58.

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Abstract

The embodiment of the invention discloses a MoSxOy / carbon nanometer composite material, and a preparation method and application thereof, wherein in the MoSxOy / carbon nanometer composite material, x is greater than or equal to 2.5 but is smaller than or equal to 3.1; y is greater than or equal to 0.2 but is smaller than or equal to 0.7; on the basis of the total mass of the nanometer composite material, the mass percentage of the MoSxOy is 5 to 50 percent. When the prepared MoSxOy / carbon nanometer composite material is used as an electrocatalysis hydrogen evolution reaction catalyst, the current density during the overpotential of 300mV is equal to or higher than 150 mA / cm<2>; the performance has small differences from a commercial 20-percent Pt / C catalyst, or is even identical to that of the commercial 20-percent Pt / C catalyst. The performance is much better than that of the existing MoS2 composite material. In addition, the prepared MoSxOy / carbon nanometer composite material also has good catalysis stability; after the 8000 times of catalysis circulation, the current density is only lowered by 3 percent; excellent catalysis performance and circulation stability are shown.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a MoS x o y / Carbon nanocomposites, their preparation methods and their applications. Background technique [0002] As a clean new energy, hydrogen is of great significance to environmental protection and energy security. How to prepare hydrogen on a large scale is a fundamental problem in the commercial-scale utilization of hydrogen energy. Electrochemical hydrogen evolution reaction (Hydrogen Evolution Reaction, HER) is regarded as a feasible solution for large-scale production of hydrogen, but the reaction has a high cathode overpotential on the cathode, which leads to a significant increase in the energy cost of hydrogen production. As the catalyst of this reaction, platinum group noble metals can reduce the cathode overpotential very well, but due to the limited reserves of platinum group noble metals on the earth, they cannot meet the needs of large-scale applications...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/06C25B1/04C25B11/04H01M4/86H01M4/90
CPCC01G39/06C25B1/04H01M4/86H01M4/9016C01P2004/04C01P2002/72C01P2002/85C01P2006/40C01P2004/80C25B11/051C25B11/091H01M4/90H01M8/1004H01M4/8647H01M4/8825H01M4/9083H01M8/0202Y02E60/36Y02E60/50Y02E60/10C01B32/15H01M4/1397H01M4/5815H01M4/583H01M2004/028H01M2220/30
Inventor 翟茂林曹朋飞彭静李久强
Owner PEKING UNIV
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