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Preparation method and application of carbon nanofiber-based electrocatalyst

A technology of carbon nanofibers and catalysts, applied in the field of electrocatalysis, can solve problems such as hindering efficient conversion of energy, small number of active sites, unfavorable performance, etc., achieve excellent electrocatalytic performance and cycle stability, and the preparation method is simple and convenient. Effect of improving stability and conductivity

Active Publication Date: 2021-04-02
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] However, although a lot of work has been devoted to the research of carbon-based non-noble metal electrocatalysts and some progress has been made, there are still several problems to be solved urgently regarding the design and preparation of new non-noble metal catalysts: First, the non-noble metal catalysts The conductivity of the catalyst is poor, which is not conducive to the process of charge and mass transfer; second, most of the non-noble metal electrocatalysts studied have poor stability, which greatly increases the practical cost; third, the exposed active sites of the prepared catalysts The number of points is small, which is not conducive to the further improvement of performance; Fourth, the electrochemical reaction kinetics at the interface is slow, which hinders the efficient conversion of energy

Method used

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  • Preparation method and application of carbon nanofiber-based electrocatalyst
  • Preparation method and application of carbon nanofiber-based electrocatalyst
  • Preparation method and application of carbon nanofiber-based electrocatalyst

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preparation example Construction

[0035] In some embodiments of the present invention, the preparation method of the carbon nanofiber-based electrocatalyst comprises the following steps:

[0036] Disperse candle ashes in an organic solvent, then add high molecular polymer, dibenzyl disulfide (BDS), after stirring, add cobalt salt and nickel salt, and continue stirring to obtain a precursor solution;

[0037] Electrospinning the precursor solution, collecting the fiber precursor, and drying;

[0038] The dry fiber precursor is air-fired at 150-300° C. for 1-3 hours, and then carbonized at high temperature in an inert atmosphere to obtain a carbon nanofiber-based electrocatalyst.

[0039] The preparation method of carbon nanofiber-based electrocatalyst of the present invention is as follows figure 1 Shown: put the glass piece in the candle flame, after burning for a period of time, scrape off the soot collected on the glass piece is the candle ashes, the candle ashes are carbon nanoparticles; put the candle ash...

Embodiment 1

[0049] The preparation method of carbon nanofiber-based electrocatalyst in this embodiment is:

[0050] Put the glass piece in the candle flame, and scrape off the soot collected on the glass piece as candle ash; dissolve 0.323g of candle ash particles in 5ml of N,N-dimethylformamide solution, and perform ultrasonic dispersion treatment for 3h, Then 0.323g of polyacrylonitrile (MW=150000) and 0.257g of dibenzyl disulfide were dissolved into the above solution and stirred for 12h, and finally 0.75mmol of cobalt nitrate hexahydrate and 0.75mmol of nickel nitrate hexahydrate were added to the solution and stirred for 12h .

[0051] Package the successfully prepared precursor solution above into a 10ml syringe, set the distance between the needle tip and the receiver to 13cm, set the voltage applied between the positive and negative electrodes during the spinning process to 18kV, and set the injection speed of the syringe to 0.2ml / h, the spinning temperature is 30°C, and the hum...

Embodiment 2

[0056] The difference between the preparation method of the carbon nanofiber-based electrocatalyst of Example 2 and Example 1 is that Example 2 is subjected to high-temperature carbonization at 700° C. for 2 hours, and the others are the same as Example 1.

[0057] Use scanning electron microscope to characterize the morphology of the carbon nanofiber-based electrocatalyst that embodiment 2 makes, its SEM figure is as follows Figure 4 As shown, a small amount of nanoparticles were loaded on the fiber surface.

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Abstract

The invention provides a preparation method of a carbon nanofiber-based electrocatalyst. The preparation method comprises the following steps: dispersing candle ash in an organic solvent, adding a high-molecular polymer and dibenzyl disulfide, stirring, adding a cobalt salt and a nickel salt, and continuing stirring to obtain a precursor solution; carrying out electrostatic spinning on the precursor solution, collecting a fiber precursor, and drying; and carrying out air burning on the dried fiber precursor at 150-300 DEG C for 1-3 hours, and then carrying out high-temperature carbonization inan inert atmosphere to obtain the carbon nanofiber-based electrocatalyst. The carbon nanofiber-based electrocatalyst prepared by the method has excellent electrocatalytic performance and cycling stability.

Description

technical field [0001] The invention belongs to the technical field of electrocatalysis, and relates to a preparation method and application of a carbon nanofiber-based electrocatalyst. Background technique [0002] The depletion of fossil energy has become a major problem for human survival and sustainable development in the future, and finding a clean, efficient and sustainable new energy system to replace traditional non-renewable fossil energy has become an imminent challenge. Since 2009, Gong K et al. (Gong, K.; Du, F.; Xia, Z.; Durstock, M.; Dai, L. Nitrogen-doped carbon nanotube arrays with high electrocatalytic activity for oxygen reduction. Science 2009, 323( 5915), 760-4) found that vertically grown N-doped carbon nanotubes have good catalytic properties, and more and more researchers have begun to turn their attention to doped modified carbon materials, such as carbon nanotubes , carbon nanofibers, carbon nanospheres, carbon nanosheets, etc. [0003] Electrocata...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/96D01F9/21D01F9/22B82Y30/00B82Y40/00
CPCH01M4/96D01F9/225D01F9/21B82Y40/00B82Y30/00Y02E60/50
Inventor 陈善亮余浩张东东杨为佑
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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