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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
  • Claims
  • 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 composites are liquid phase methods, such as hydrothermal method, co-precipitation method, etc.
However, the chemical reactions of these liquid-phase methods are complex, difficult to control, and require complicated follow-up purification and impurity removal processes.

Method used

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

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preparation example Construction

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

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

[0032] (2) MoO 3 Powder and absolute ethanol are mixed according to the ratio of (5-70g): (50-100ml), and fully stirred to form a uniform suspension; then the pre-oxidized polyacrylonitrile fiber is placed in it and soaked for 10-60min; then aired Dry and set aside.

[0033] (3) In the vacuum tube furnace, place the alumina ceramic crucible with sulfur powder on the top of the air flow at a distance of 10-40 cm from the central heating area of ​​the furnace, and fill the crucible soaked with MoO 3 The suspension of pre-oxidized polyacrylonitrile fibers on a quartz substrate is placed in the central heating zone of the ...

Embodiment 1

[0039] Example 1: In a vacuum tube furnace, place an alumina ceramic crucible with 3g of sulfur powder on the top of the airflow at a distance of 20cm from the central heating zone of the furnace. 3 Powder and 10ml of absolute ethanol prepared by soaking and drying the pre-oxidized polyacrylonitrile fiber quartz substrate placed in the central heating area of ​​the furnace.

[0040] Before heating, first use a vacuum pump to evacuate the whole system to below 0.01Pa, then feed high-purity argon gas of more than 99.99vol.% into the system, and repeat 3 times to remove the air in the system. Then the temperature was raised to 400° C. at a rate of 20° C. / min, kept at a temperature of 10 minutes, then raised to 1100° C. at a rate of 25° C. / min, and kept at a temperature of 2 hours. During the heating process, under the premise that the vacuum system continued to work, argon gas was introduced and the flow rate of the carrier gas was kept at 100 standard cubic centimeters per minut...

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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
CPCC25B1/04B01J27/051B01J35/00B01J35/30B01J35/39Y02E60/36
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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