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Carbon-coated MoSe2/graphene electrospun nanofibers and preparation method thereof

A technology of electrospinning nanofibers and nanofibers, applied in circuits, electrical components, battery electrodes, etc., can solve the problems of graphene agglomeration, affecting electrochemical performance, etc., and achieve the effect of inhibiting volume expansion

Active Publication Date: 2017-09-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some research groups improve the conductivity of the material by doping graphene, their graphene is simply doped and not well dispersed, resulting in the agglomeration of graphene, which affects the electrochemical performance
Currently about MoSe 2 The preparation of nanofibers is rarely reported, therefore, the development of a MoSe 2 Nanofibers and their simple and effective preparation methods are particularly important

Method used

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  • Carbon-coated MoSe2/graphene electrospun nanofibers and preparation method thereof
  • Carbon-coated MoSe2/graphene electrospun nanofibers and preparation method thereof
  • Carbon-coated MoSe2/graphene electrospun nanofibers and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Weigh 0.5297gH 24 Mo 7 N 6 o 24 4H 2 O was dissolved in 1mL of deionized water solution and 1mL of ethylene glycol mixed solution, stirred for use, weighed 0.6114g PVP powder was dissolved in 2mL of deionized water solution and stirred in a 60°C water bath for half an hour to form a transparent sol, Add the molybdenum salt solution, weigh 5 mg of graphene and place it in 2 mL of deionized water, stir at high speed for 5 minutes, add it to the sol solution, stir at room temperature for 6 hours to make an electrospinning solution, put it into a 10 mL syringe, and prepare it by electrospinning Nanofiber, electrospinning parameters: the voltage is 30KV, the distance between the needle and the collecting plate is 20cm, and the advancing speed is 0.3mL / h. The obtained spun fibers were dried in a vacuum oven at 60°C for 12h, and then vacuum sintered with 2g of selenium powder at a temperature of 650°C for 2h and a heating rate of 10°C / min to obtain a carbon coating with a ...

Embodiment 2

[0055] Weigh 0.5297gH 24 Mo 7 N 6 o 24 4H 2 O was dissolved in 1mL of deionized water solution and 1mL of ethylene glycol mixed solution, stirred for use, weighed 0.6114g PVP powder was dissolved in 2mL of deionized water solution and stirred in a 60°C water bath for half an hour to form a transparent sol, Add the molybdenum salt solution, weigh 5 mg of graphene and place it in 2 mL of deionized water, stir at high speed for 5 minutes, add it to the sol solution, stir at room temperature for 6 hours to make an electrospinning solution, put it into a 10 mL syringe, and prepare it by electrospinning Nanofiber, electrospinning parameters: the voltage is 25KV, the distance between the needle and the collecting plate is 20cm, and the advancing speed is 0.3mL / h. The obtained spun fibers were dried in a vacuum oven at 60°C for 12h, and then vacuum sintered with 2g of selenium powder at a temperature of 650°C for 2h at a heating rate of 10°C / min to obtain a carbon coating with a d...

Embodiment 3

[0057] Weigh 0.5297gH 24 Mo 7 N 6 o 24 4H 2O was dissolved in 1mL of deionized water solution and 1mL of ethylene glycol mixed solution, stirred for use, weighed 0.6114g PVP powder was dissolved in 2mL of deionized water solution and stirred in a 60°C water bath for half an hour to form a transparent sol, Add the molybdenum salt solution, weigh 1 mg of graphene and place it in 2 mL of deionized water, stir at high speed for 5 minutes, add it to the sol solution, stir at room temperature for 6 hours to make an electrospinning solution, put it into a 10 mL syringe, and prepare it by electrospinning Nanofiber, electrospinning parameters: the voltage is 30KV, the distance between the needle and the collecting plate is 20cm, and the advancing speed is 0.3mL / h. The obtained spun fibers were dried in a vacuum oven at 60°C for 12h, and then vacuum sintered with 2g of selenium powder at a temperature of 650°C for 2h and a heating rate of 10°C / min to obtain a carbon coating with a d...

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Abstract

The invention relates to carbon-coated MoSe2 / graphene nanofibers prepared by electrospining and a preparation method thereof. The nanofibers are composed of coated carbon, MoSe2 and graphene. The preparation method comprises the following steps: dissolving water soluble molybdenum salt and a high polymer in a mixed solution of deionized water and ethylene glycol, heating the mixed solution till a stable transparent sol is formed, adding the graphene into the molybdenum salt solution to form an electrospining solution; electrospining the electrospining solution to obtain hybridized fibers; and then vacuum sintering the hybridized fibers obtained in the step 2 and zero valent selenium powder in a tubular furnace to obtain a carbon-coated MoSe2 / graphene nanofiber material. The fibers are uniform in shape and length, and MoSe2 crystals are uniformly distributed in the fibers and are coated by amorphous carbon; and the graphene as a conductive network is uniformly distributed in the fibers. According to the carbon-coated MoSe2 / graphene nanofibers provided by the invention, the raw materials are easily available, the preparation process is simple and controllable reaction conditions are mild, and the obtained product has a relatively high specific surface area, excellent conductivity and structural stability and can be used as an ideal lithium / sodium ion battery cathode material and a high performance electrocatalytic material.

Description

technical field [0001] The invention relates to the field of nanomaterials, in particular to a carbon-coated MoSe prepared by electrospinning 2 / Graphene nanofiber and preparation method thereof. Background technique [0002] Currently, the world is facing serious pressure from global warming and energy crisis, and rechargeable batteries, such as lithium-ion batteries and sodium-ion batteries, have attracted great attention as alternative energy storage devices for fossil fuels. Although lithium-ion batteries have achieved commercial success, the scarcity of lithium and its high cost are difficult to meet the needs of future development. Due to the high content of sodium in the earth's crust, low cost, and a similar working mechanism are considered to be the next generation of rechargeable batteries. However, the larger sodium ion radius Na + with Li + (0.102 vs 0.076nm) may cause a large volume expansion effect and poor kinetic performance, resulting in unsatisfactory ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62
CPCH01M4/364H01M4/625Y02E60/10
Inventor 陈立宝崔超周钢韦伟峰李成超
Owner CENT SOUTH UNIV
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