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Electrocatalytic material loaded with vanadium-cobalt alloy nanoparticles and preparation method of electrocatalytic material

A technology of electrocatalytic materials and nanoparticles, applied in the direction of catalyst activation/preparation, chemical instruments and methods, nanotechnology, etc., can solve the problems of low catalytic activity, poor electrical conductivity, and low cost, and achieve improved catalytic activity and good stability , Efficient hydrogen evolution effect

Active Publication Date: 2019-05-03
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the problems of low catalytic activity, poor stability and poor conductivity of catalytic materials in the prior art.
[0008] The object of the present invention is to provide a kind of electrocatalytic material and preparation method thereof of loading vanadium-cobalt alloy nano-particle, overcome the difficult problem such as low catalytic activity, poor stability, poor electrical conductivity of precious metal or transition metal oxide material in the prior art, this method The cost is low, and the prepared electrocatalyst has high hydrogen evolution activity and good stability under both acidic and alkaline conditions

Method used

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  • Electrocatalytic material loaded with vanadium-cobalt alloy nanoparticles and preparation method of electrocatalytic material
  • Electrocatalytic material loaded with vanadium-cobalt alloy nanoparticles and preparation method of electrocatalytic material
  • Electrocatalytic material loaded with vanadium-cobalt alloy nanoparticles and preparation method of electrocatalytic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Add 0.25g of cobalt nitrate and 0.1g of vanadium acetylacetonate to 30g of polyacrylonitrile / N,N-dimethylformamide solution with a mass fraction of 15wt%, stir evenly by magnetic force, and then use electrospinning method The solution is spun, the spinning voltage is controlled to be 15kV, the distance from the receiving device to the pillow is 15cm, and the flow rate of the solution is 0.01mL / min to obtain a mixed nanofiber membrane;

[0041] (2) Put 0.5g of the prepared mixed nanofiber membrane into a corundum boat, place it in the middle of the tube furnace, first raise the temperature to 230°C at a heating rate of 5°C / min, and keep it warm for 3 hours in an air atmosphere; After the heat preservation is over, in a mixed atmosphere of 150sccm argon and 3sccm ammonia, the temperature is raised to 800°C at a rate of 5°C / min, and the carbonization is carried out at 800°C for 3 hours. That is, the prepared Co 3 V / CNFs catalytic material.

[0042] figure 1 a is Co ...

Embodiment 2

[0048] (1) Take 0.25g of cobalt nitrate and 0.2g of vanadium acetylacetonate and add it to 30g of polyacrylonitrile / N,N-dimethylformamide solution with a mass fraction of 8wt%, stir evenly by magnetic force, and then use electrospinning method The solution is spun, the spinning voltage is controlled to be 10kV, the distance from the receiving device to the pillow is 10cm, and the flow rate of the solution is 0.01mL / min to obtain a mixed nanofiber membrane;

[0049] (2) Put 0.5g of the prepared mixed nanofiber membrane into a corundum boat, place it in the middle of the tube furnace, first raise the temperature to 340°C at a heating rate of 5°C / min, and keep it warm for 3 hours in an air atmosphere; After the heat preservation is over, in a mixed atmosphere of 150sccm argon and 2sccm ammonia, the temperature is raised to 900°C at a rate of 5°C / min, and the carbonization is carried out at 900°C for 3 hours. That is, the catalytic material is prepared.

[0050] (3) will Co 3 V / ...

Embodiment 3

[0052] (1) Add 0.25g of cobalt nitrate and 0.48g of vanadium acetylacetonate to 30g of polyacrylonitrile / N,N-dimethylformamide solution with a mass fraction of 18wt%, stir evenly by magnetic force, and then use electrospinning method The solution is spun, the spinning voltage is controlled to be 10kV, the distance from the receiving device to the pillow is 10cm, and the flow rate of the solution is 0.01mL / min to obtain a mixed nanofiber membrane;

[0053] (2) Put 0.5g of the prepared mixed nanofiber membrane into a corundum boat, place it in the middle of the tube furnace, first raise the temperature to 230°C at a heating rate of 5°C / min, and keep it warm for 3 hours in an air atmosphere; After the heat preservation is over, in a mixed atmosphere of 200sccm argon and 2sccm ammonia, the temperature is raised to 800°C at a rate of 5°C / min, and the carbonization is carried out at 800°C for 3 hours. That is, the catalytic material is prepared.

[0054] (3) will Co3 V / CNFs for ele...

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Abstract

The invention discloses an electrocatalytic material loaded with vanadium-cobalt alloy nanoparticles and a preparation method of the electrocatalytic material, and belongs to the technical field of composite material preparation. The carbon nanofiber-supported vanadium-cobalt alloy nanoparticle catalytic material for water electrolysis is prepared by loading a vanadium source and a cobalt source onto an ultrafine fiber carbon precursor by utilizing an electrospinning method, performing pre-oxidation, and performing reduction; and the catalytic material for the water electrolysis is composed ofreaction active matter and a carrier, wherein the reaction active matter is a vanadium-cobalt alloy nanoparticles, and the carrier is a carbon nanofiber material prepared by the electrospinning method. The catalytic material for the water electrolysis prepared by the method has a high specific surface area, thereby facilitating electrolyte diffusion and gas desorption; hydrogen evolution can be performed under acidic and alkaline conditions, and the hydrogen production speed under large voltage is much higher than that of a commercial Pt / C electrode; and in addition, the catalytic material for the water electrolysis prepared by the method does not need to coat an electrode, and can be directly used as an electrode for electrolyzing water.

Description

technical field [0001] The invention relates to an electrocatalytic material loaded with vanadium-cobalt alloy nanoparticles and a preparation method thereof, in particular to a carbon nanofiber loaded vanadium-cobalt alloy nanoparticle electrocatalytic material and a preparation method thereof, belonging to the technical field of composite material preparation. Background technique [0002] Energy is an important material basis for human survival and the development of civilization. The depletion of fossil fuels such as oil, coal, and natural gas forces people to look for a renewable new energy with abundant reserves. Hydrogen energy is considered to be one of the most promising green energy in the 21st century because of its high combustion calorific value, non-polluting combustion products, and recyclable utilization. Therefore, the development of hydrogen energy has become one of the hotspots in the field of new energy research. Although hydrogen is the most common eleme...

Claims

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Application Information

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IPC IPC(8): B01J23/847B01J35/06B01J37/08B82Y30/00B82Y40/00C25B1/04C25B11/06
CPCY02E60/36
Inventor 杜明亮朱罕陆双龙张颂歌郝嘉策段芳
Owner JIANGNAN UNIV
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