Nitrogen-cobalt-doped hollow carbon nanofiber, preparation method and application thereof and metal-air battery

A metal-air battery and carbon nanofiber technology, applied in battery electrodes, fiber processing, fuel cell-type half-cells and primary battery-type half-cells, etc., can solve the application limitations of zinc-air batteries, limit the wide range of applications, and reserve Scarcity and other issues, to achieve excellent electrochemical performance, good internal channels, improve electrochemical performance and cycle stability

Active Publication Date: 2019-10-15
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the application of Zn-air batteries is greatly limited due to the slow kinetic progress of electrocatalytic reduction reaction (ORR) and oxygen evolution reaction (OER).
Although noble metals such as platinum, iridium, and ruthenium have high activity in catalyzing ORR and OER, their high cost, scarce reserves, and single catalyst also limit their wider application.

Method used

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  • Nitrogen-cobalt-doped hollow carbon nanofiber, preparation method and application thereof and metal-air battery
  • Nitrogen-cobalt-doped hollow carbon nanofiber, preparation method and application thereof and metal-air battery
  • Nitrogen-cobalt-doped hollow carbon nanofiber, preparation method and application thereof and metal-air battery

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preparation example Construction

[0032] The present invention also provides a method for preparing nitrogen-cobalt-doped hollow carbon nanofibers described in the above technical solution, comprising the following steps:

[0033] (1) Polymethyl methacrylate solution is used as the electrospinning inner layer solution; the mixed solution of polyacrylonitrile, cobalt acetate, polyvinylpyrrolidone and organic solvent is used as the electrospinning outer layer solution;

[0034] (2) subjecting the electrospinning inner layer solution and the electrospinning outer layer solution to coaxial electrospinning to form a fiber film on the receiving plate;

[0035] (3) leave standstill after mixing 2-methylimidazole, cobalt nitrate, fiber membrane and organic solvent, grow ZIF-67 crystal on the fiber membrane surface;

[0036] (4) The fiber membrane grown with ZIF-67 crystals was pre-oxidized and carbonized sequentially to obtain nitrogen-cobalt-doped hollow carbon nanofibers.

[0037] In the invention, the polymethyl m...

Embodiment 1

[0054] (1) Dissolve 2.2g polymethyl methacrylate (PMMA) into 8mL N,N-dimethylformamide (DMF) as the inner layer solution for electrospinning; 1.05g polyacrylonitrile (PAN), 0.315g cobalt acetate (Co(Ac) 2 ) and 0.6g polyvinylpyrrolidone (PVP) were dissolved in 9mL N,N-dimethylformamide (DMF) as the electrospinning outer layer solution, and the above inner layer and outer layer solutions were stirred at room temperature for 12h until The solute is completely dissolved.

[0055] (2) Pour the above-mentioned inner layer and outer layer electrospinning solution stirred at room temperature for 12 hours into a disposable syringe with a capacity of 10 mL, and place it in a propulsion pump. The aluminum foil was used as the receiver, and the voltage was set to 21kV; the temperature was maintained at 20°C; the humidity was maintained at 30%; the needle used was a coaxial electrospinning needle, and the inner and outer diameters were 0.86 and 1.66mm respectively; between the needle and...

Embodiment 2

[0060] (1) Dissolve 2.2g polymethyl methacrylate (PMMA) into 8mL N,N-dimethylformamide (DMF) as the inner layer solution for electrospinning; 1.05g polyacrylonitrile (PAN), 0.315g cobalt acetate (Co(Ac) 2 ) and 0.6g polyvinylpyrrolidone (PVP) were dissolved in 9mL N,N-dimethylformamide (DMF) as an electrospinning outer layer solution, and the above inner layer and outer layer solutions were stirred at room temperature for 12h until The solute is completely dissolved.

[0061] (2) Pour the above-mentioned inner layer and outer layer electrospinning solution into a disposable syringe with a capacity of 10mL, and place it in the propulsion pump. During the electrospinning process, use the aluminum foil fixed on the receiving plate as the receiver , the voltage was set to 21kV; the temperature was maintained at 20°C; the humidity was maintained at 30%; the needle used was a coaxial electrospinning needle with an inner diameter and an outer diameter of 0.86 and 1.66mm respectively...

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Abstract

The invention provides a nitrogen-cobalt-doped hollow carbon nanofiber, a preparation method and application thereof and a metal-air battery. In the nitrogen-cobalt-doped hollow carbon nanofiber provided by the invention, nitrogen and cobalt are dispersed inside and on the surface of hollow carbon nanofiber. The nitrogen-cobalt-doped hollow carbon nanofiber provided by the invention has good ORR and OER performance, and has a half-wave potential of 0.785-0.809V, a limiting current density of 4.58-5.20mA / cm2 at 0.2V, and an overpotential of 473mV to 512mV when the current density is 10mA / cm2. Moreover, the zinc-air battery assembled from the nitrogen-cobalt-doped hollow carbon nanofiber of the invention has good charge-discharge cycle stability, and has no significantly increased voltage gap after 270hours of circulation.

Description

technical field [0001] The invention relates to the field of metal-air batteries, in particular to a nitrogen-cobalt-doped hollow carbon nanofiber, a preparation method and application thereof, and a metal-air battery. Background technique [0002] With the increasing demand for electricity in transportation, industry, and daily life, on the one hand, fossil energy sources such as coal, natural gas, and oil are being depleted at a faster rate; on the other hand, the use of these energy sources has also had a very large impact on the environment and climate influences. In view of the limited fossil energy resources, it is particularly urgent to develop sustainable green energy. [0003] Metal-air batteries have attracted extensive attention due to their high energy density, low cost, and environmental safety and friendliness. However, the application of Zn-air batteries is greatly limited due to the slow kinetic progress of electrocatalytic reduction reaction (ORR) and oxyg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/96H01M12/06D04H1/728D04H1/4382D01D5/00
CPCD01D5/0069D04H1/4382D04H1/728H01M4/90H01M4/9041H01M4/96H01M12/06
Inventor 李光彭威杨晓晓金俊弘杨胜林
Owner DONGHUA UNIV
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