Molybdenum carbide/ graphene/carbon nanofiber composite material, and preparation method thereof

A technology of carbon nanofibers and composite materials, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, electrical components, etc., can solve the problems of reducing the exposure of electrochemical active sites, reducing catalytic properties, etc., and achieve easy operation , The preparation process is simple, the effect of good flexibility

Inactive Publication Date: 2016-10-26
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, pure molybdenum carbide is easy to agglomerate, which will reduce the exposure of its electrochemical active sites, thereby reducing its catalytic properties.

Method used

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  • Molybdenum carbide/ graphene/carbon nanofiber composite material, and preparation method thereof
  • Molybdenum carbide/ graphene/carbon nanofiber composite material, and preparation method thereof
  • Molybdenum carbide/ graphene/carbon nanofiber composite material, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1, the present embodiment comprises the following steps:

[0039] (1) Add 1 g polyacrylonitrile powder to 10 mL N , N - In the dimethylformamide solvent, keep stirring to prepare a uniform viscous dispersion;

[0040] (2) The obtained polyacrylonitrile dispersion was subjected to electrospinning, and the adjustment process parameters were: electrostatic field voltage 20 kV, spinning speed 0.3 mm min -1 , the receiving distance is 20 cm, and the polyacrylonitrile nanofiber membrane is prepared;

[0041] (3) The obtained polyacrylonitrile spun 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 preoxidation time is 1h, and the preoxidized polyacrylonitrile nanofiber membrane is prepared;

[0042] (4) The obtained pre-oxidized polyacrylonitrile nanofiber membrane was mixed with 2 mg mL -1 Soak in graphene oxide solution for 12 h to prepare polyacrylonitrile nanofiber / graphene ox...

Embodiment 2

[0048] Example 2. Change the mass of ammonium heptamolybdate in Example 1 to 200 mg, and the mass of glucose to 50 mg, and the rest are the same as in Example 1. The composite material finally obtained is denoted as GCNF@Mo 2 C-2.

Embodiment 3

[0049] Example 3. Change the mass of ammonium heptamolybdate in Example 1 to 400 mg, and the mass of glucose to 100 mg, and the rest are the same as in Example 1. The composite material finally obtained is denoted as GCNF@Mo 2 C-3.

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Abstract

This invention belongs to the technical field of transition metal carbide-carbon material, and specifically provides a molybdenum carbide/ graphene/carbon nanofiber composite material, and a preparation method thereof. The preparation method comprises the following steps: preparing and obtaining a polyacrylonitrile nanofiber film through electrostatic spinning; coating the oxidized graphene on the polyacrylonitrile nanofiber film through a solution immersion method; preparing a graphene/carbon nanofiber composite film through high-temperature carbonization; acidizing the obtained composite film; at last, in-situ growing molybdenum carbide nanospheres on the graphene/carbon nanofiber composite film through a one-step hydrothermal method and the high-temperature carbonization. The molybdenum carbide/ graphene/carbon nanofiber composite material prepared by this method has a controllable shape, has the higher specific surface area and excellent conductivity, and can be used as an ideal high-performance electro-catalysis material, and the electrode material of the new-energy devices, such as the lithium ion battery, the super capacitor, and so on.

Description

technical field [0001] The invention belongs to the technical field of transition metal carbide-carbon materials, and in particular relates to a molybdenum carbide / graphene / carbon nanofiber composite material and a preparation method thereof. Background technique [0002] Graphene is a two-dimensional material composed of carbon atoms with a thickness of only one atom. It has excellent physical and chemical properties, such as high internal carrier mobility (200000 cm 2 V -1 the s -1 ), good thermal conductivity (~5000 W m -1 K -1 ), high transmittance (~ 97.7%) and theoretical specific surface area (2630 m 2 g -1 ), as well as excellent mechanical strength, is considered to be one of the most promising nanomaterials today. Carbon nanofibers, as a one-dimensional carbon nanomaterial, have the advantages of good mechanical properties, large specific surface area and good chemical stability. These special properties make them widely used in catalyst supports, polymer na...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/34H01G11/36H01G11/86H01M4/36
CPCH01G11/34H01G11/36H01G11/86H01M4/362H01M4/364Y02E60/10Y02E60/13
Inventor 刘天西郜伟施贻琴樊玮左立增鲁恒毅
Owner FUDAN UNIV
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