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Molybdenum selenide/porous carbon nanofiber composite material and preparation method and application thereof

A technology of nanofibers and composite materials, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problem of affecting catalytic properties and energy storage cycle stability, and insufficient electrochemical active sites Exposure and other problems, to achieve the effect of effective and fast preparation method, ingenious experimental design, and simple preparation process

Inactive Publication Date: 2016-05-25
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Molybdenum selenide is widely used in the fields of catalytic hydrogen evolution and lithium-ion batteries, but pure molybdenum selenide is easy to agglomerate, and the electrochemical active sites cannot be fully exposed, which seriously affects its catalytic properties and cycle stability of energy storage.

Method used

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  • Molybdenum selenide/porous carbon nanofiber composite material and preparation method and application thereof
  • Molybdenum selenide/porous carbon nanofiber composite material and preparation method and application thereof
  • Molybdenum selenide/porous carbon nanofiber composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This embodiment includes the following steps:

[0039] (1) Add 0.8g polyacrylonitrile powder and 0.2g polystyrene to 10mL N,N- In dimethylformamide solvent, stirring continuously, a uniform viscous dispersion was prepared.

[0040] (2) Electrospin the obtained polyacrylonitrile / polystyrene dispersion, and adjust the process parameters as follows: electrostatic field voltage 20kV, spinning speed 0.3mmmin -1 , the receiving distance is 20cm, and the polyacrylonitrile / polystyrene nanofiber membrane is prepared.

[0041](3) The obtained polyacrylonitrile / polystyrene nanofiber spinning membrane was pre-oxidized in an air atmosphere, the pre-oxidation temperature was 250 °C, and the heating rate was 1 °C min -1 , the pre-oxidation time is 1 h, and the pre-oxidized polyacrylonitrile / polystyrene nanofiber membrane is prepared.

[0042] (4) The obtained pre-oxidized fiber membrane was subjected to high-temperature carbonization in high-purity nitrogen gas, the high-temperatur...

Embodiment 2

[0049] The quality of the selenium powder in embodiment 1 becomes 18mg, and the quality of sodium molybdate becomes 27.58mg, and all the other are the same as embodiment 1, and the composite material finally obtained is denoted as PCNFMoSe 2 -2. figure 2 It is the XRD figure of the molybdenum selenide / porous carbon nanofiber composite material of embodiment 2. image 3 is the linear sweep voltammetry curve (LSV) of the molybdenum selenide / porous carbon nanofiber composite material of Example 2 and pure molybdenum selenide.

Embodiment 3

[0051] The quality of the selenium powder in embodiment 1 becomes 30mg, and the quality of sodium molybdate becomes 45.96mg, and all the other are the same as embodiment 1, and the composite material finally obtained is denoted as PCNFMoSe 2 -3.

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Abstract

The present invention belongs to the technical field of transition metal sulfur group compound-carbon materials, and in particular relates to a molybdenum selenide / porous carbon nanofiber composite material and a preparation method and application thereof. The preparation process is as follows: porous carbon nanofiber is obtained by electrostatic spinning and high temperature carbonization of polystyrene as a pore-forming agent, and a one-step hydrothermal method is used for situ growth of molybdenum selenide nano chips on the porous carbon nanofiber. The prepared porous carbon nanofiber has the advantages of large specific surface area, chemical stability, good conductivity, excellent mechanical properties, and the like, the prepared molybdenum selenide / porous carbon nanofiber composite material is controllable in morphology, the molybdenum selenide nano chips are uniformly grown on the carbon nanofiber, and a unique base structure and a high specific surface area of the porous carbon nanofiber are fully used. The molybdenum selenide / porous carbon nanofiber composite material can be used as an ideal high-performance electro-catalytic material and an electrode material of lithium-ion batteries and solar cells and other new energy devices.

Description

technical field [0001] The invention belongs to the technical field of transition metal chalcogenide-carbon materials, and in particular relates to a molybdenum selenide / porous carbon nanofiber composite material and a preparation method thereof. technical background [0002] Carbon nanofibers have excellent physical and chemical properties, such as high electrical conductivity, excellent mechanical properties, high specific surface area, and good chemical stability. They are used in catalyst supports, polymer nanocomposites, and energy conversion and storage devices. Flexible substrate materials and other fields have a wide range of applications. Electrospinning is a simple and effective technology for preparing carbon nanofibers. Polymer solutions or melts are spun by high-voltage electrostatics to form polymer fibers, and then pre-oxidized and high-temperature carbonized to prepare carbon nanofibers with three-dimensional high ratio. Surface area and high conductivity of...

Claims

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Application Information

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IPC IPC(8): B01J27/057B01J35/10B01J35/06C25B11/06C25B1/04
CPCC25B1/04C25B11/04B01J27/0573B01J35/58B01J35/60Y02E60/36Y02P20/133
Inventor 刘天西顾华昊左立增黄云鹏樊玮郜伟
Owner FUDAN UNIV
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