Carbon fiber@molybdenum disulfide nanosheet core-shell composite structure and preparation method thereof

A molybdenum disulfide, composite structure technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve difficult molybdenum disulfide-carbon composite materials, complex chemical reactions, complex purification and impurity removal and other problems, to achieve the effect of controllable morphology, high purity, and nanoscale order.

Inactive Publication Date: 2016-12-21
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] However, due to the low temperature resistance of carbon materials such as graphene, it is difficult to directly synthesize molybdenum disulfide-carbon composites by traditional high-temperature methods; therefore, the traditional preparation methods of such co

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  • Carbon fiber@molybdenum disulfide nanosheet core-shell composite structure and preparation method thereof
  • Carbon fiber@molybdenum disulfide nanosheet core-shell composite structure and preparation method thereof
  • Carbon fiber@molybdenum disulfide nanosheet core-shell composite structure and preparation method thereof

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Example Embodiment

[0030] The preparation method of the carbon fiber@molybdenum disulfide nanosheet core-shell composite structure provided by the present invention includes the following steps and contents:

[0031] (1) Using commercially available analytical pure sulfur powder, MoO 3 Powder and chemically pure pre-oxidized polyacrylonitrile fiber as raw materials.

[0032] (2) Put MoO 3 Mix the powder with absolute ethanol according to the ratio of (5-70g):(50-100ml), stir thoroughly to make a uniform suspension; then place the pre-oxidized polyacrylonitrile fiber in it and soak for 10-60min; then air Dry and set aside.

[0033] (3) In a vacuum tube furnace, place an alumina ceramic crucible containing sulfur powder at a distance of 10-40 cm from the heating area in the center of the furnace above the airflow. 3 The quartz substrate of the suspension pre-oxidized polyacrylonitrile fiber is placed in the central heating zone of the furnace.

[0034] (4) Before heating, use a vacuum pump to vacuum the e...

Example Embodiment

[0039] Example 1: In a vacuum tube furnace, an alumina ceramic crucible containing 3g of sulfur powder is placed above the airflow at a distance of 20cm from the central heating zone of the furnace, and the concentration of MoO is 6g. 3 The quartz substrate of pre-oxidized polyacrylonitrile fiber immersed in a suspension prepared by powder and 10 ml of absolute ethanol and dried is placed in the central heating area of ​​the furnace.

[0040] Before heating, use a vacuum pump to evacuate the entire system to below 0.01 Pa, and then pass high purity argon gas above 99.99vol.% into the system, and repeat 3 times to remove the air in the system. Then the temperature was increased to 400°C at a rate of 20°C / min, and the temperature was kept for 10 minutes, and then the temperature was increased to 1100°C at a rate of 25°C / min, and the temperature was kept for 2 hours. During the heating process, under the premise of continuous operation of the vacuum system, argon gas is introduced an...

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Abstract

The invention relates to a carbon fiber@molybdenum disulfide nanosheet core-shell composite structure and a preparation method thereof, and belongs to the technical field of material preparation. Carbon fibers serve as an inner core of the composite structure, and molybdenum disulfide nanosheets which are arranged in an array mode serve as a shell of the composite structure. The preparation method comprises the steps that in a vacuum tubular furnace, sulfur powder is directly evaporated through a thermal evaporation technique to serve as a sulfur source, pre-oxidized polyacrylonitrile fibers soaked with MoO3 turbid liquid are fumigated at high temperature under the action of carrier gas, simultaneous synthesis of the carbon fibers and the molybdenum disulfide nanosheets is achieved, and the carbon fiber@molybdenum disulfide nanosheet core-shell composite structure can be prepared at high yield. The product prepared through the method is high in yield, density and purity and controllable in morphology and does not need aftertreatment; the method has the advantages that equipment and the process are simple, the synthesis growth conditions are strict and controllable, the product yield is high, the cost is low, and the production process is clean and environmentally friendly; the obtained material is an excellent visible light catalyst, hydrogen desulfurization catalyst, electrocatalyst, lithium ion battery electrode material and the like.

Description

technical field [0001] The invention relates to a carbon fiber@molybdenum disulfide nanosheet core-shell composite structure and a preparation method thereof, belonging to the technical field of material preparation. Background technique [0002] Molybdenum disulfide (MoS 2 ) is a transition metal sulfide with a sheet structure, and the basic unit constituting the sheet is Mo-S octahedron. Among them, Mo and S atoms are combined by strong covalent bonds, and there are only weak van der Waals forces between layers. Based on this lamellar structure, molybdenum disulfide is widely used in solid lubricants and antiwear agents. At the same time, molybdenum disulfide also has excellent optical, electrical and catalytic properties, so this material has broad application prospects in the fields of photocatalysts, photoelectric conversion devices, field effect transistors and hydrodesulfurization and denitrification catalysts. [0003] Although the band gap of molybdenum disulfide...

Claims

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Application Information

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IPC IPC(8): B01J27/051B01J35/02C25B1/04
CPCB01J27/051B01J35/004B01J35/02C25B1/04Y02E60/36
Inventor 彭志坚李汉青钱静雯李宏王猛申振广符秀丽
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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