ZnFe2O4Nitrogen-doped carbon nanofiber composite electrode material and preparation method thereof

ZnFe2O4Nitrogen-doped carbon nanofiber composite electrode material and preparation method thereof

  • CN 107,705,994 B
  • Filed: 09/06/2017
  • Issued: 04/17/2020
  • Est. Priority Date: 09/06/2017
  • Status: Active Grant
First Claim
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1. ZnFe2O4The preparation method of the nitrogen-doped carbon nanofiber composite electrode material is characterized by comprising the following steps of:

  • (1) sequentially dissolving ferric salt, zinc salt and polyacrylonitrile into a dimethylformamide solution, and fully and uniformly mixing to obtain an electrostatic spinning solution, wherein the ferric salt is one of ferric chloride and ferric nitrate, and the zinc salt is one of zinc acetate and zinc nitrate;

    the ferric salt and the zinc salt are prepared according to the molar ratio of 2;

    1, the weight percentage of polyacrylonitrile in dimethylformamide is 5-15%, and the concentration of the ferric salt in the dimethylformamide is 0.05-0.1 mol/L;

    (2) filling the electrostatic spinning solution into an injector, and connecting a metal needle of the injector with a high-voltage direct-current power supply;

    the diameter of the metal needle of the injector is 0.2-0.6 mm;

    (3) setting the voltage, the injection speed and the distance between the needle head and the receiving device of the electrostatic spinning, and carrying out the electrostatic spinning preparation under the conditions to obtain ZnFe2O4A precursor of the nitrogen-doped carbon nanofiber;

    the electrostatic spinning voltage is 10-20 kV, the injection speed is 0.5-1.5 mL/min, and the distance between the needle head and the receiver is 10-20 cm;

    (4) stabilizing, carbonizing and inducing the obtained precursor at low temperature to obtain ZnFe2O4The nitrogen-doped carbon nanofiber composite electrode material is characterized in that the stabilizing treatment is heating to 250-300 ℃

    in air, the heat preservation time is 2-4 hours, the carbonization is heating to 500-800 ℃

    in argon, the heat preservation time is 2-4 hours, the low-temperature induction treatment is heating to 250-350 ℃

    in air, and the heat preservation time is 2-4 hours;

    the ZnFe2O4The nitrogen-doped carbon nanofiber composite electrode material is prepared from nitrogen-doped carbon nanofibers and ZnFe2O4Composition of ultrafine nanoparticles of said ZnFe2O4Ultrafine nanoparticles are uniformly embedded in the nitrogen-doped carbon nanofibers, the diameter of the nitrogen-doped carbon nanofibers is 50-120 nm, and ZnFe2O4The diameter of the ultrafine nanoparticles is 10-30 nm.

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