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ZnFe2O4 nitrogen-doped nanometer fiber composite electrode material and preparation method thereof

A technology of nanofibers and composite electrodes, which is applied in the field of ZnFe2O4 nitrogen-doped carbon nanofiber composite electrode materials and its preparation, can solve the problems that the preparation technology of nitrogen-doped carbon nanofiber composite electrode materials has not been reported, etc., to improve the electrochemical performance, The process is simple, the effect of increasing conductivity and stability

Inactive Publication Date: 2018-02-16
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although considerable progress has been made, regarding ZnFe 2 o 4 Nitrogen-doped carbon nanofiber composite electrode materials and their preparation techniques have not been reported yet

Method used

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  • ZnFe2O4 nitrogen-doped nanometer fiber composite electrode material and preparation method thereof
  • ZnFe2O4 nitrogen-doped nanometer fiber composite electrode material and preparation method thereof
  • ZnFe2O4 nitrogen-doped nanometer fiber composite electrode material and preparation method thereof

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Embodiment 1

[0029] Add ferric chloride, zinc acetate, and polyacrylonitrile in a molar ratio of 2:1 to 10 mL of dimethylformamide solution in sequence, the weight percentage of polyacrylonitrile in dimethylformamide is 10%, and iron salt The concentration in dimethylformamide is 0.05mol / L. The homogeneously mixed precursor solution was filled into a syringe with a metal needle with a diameter of 0.2 mm. Then, spinning was carried out under the conditions of electrospinning at a voltage of 10 kV, a bolus injection speed of 0.5 mL / min, and a distance of 10 cm between the needle and the receiver to obtain ZnFe 2 o 4 Precursors of nitrogen-doped carbon nanofibers. Finally, the obtained precursor was heated to 250 °C in air for 4 h, heated to 800 °C in argon, carbonized for 2 h, and heated to 250 °C in air for 4 h to obtain ZnFe 2 o 4 Nitrogen-doped carbon nanofiber composite electrode material.

[0030] The prepared ZnFe 2 o 4 The SEM and TEM images of the nitrogen-doped carbon nanofib...

Embodiment 2

[0033]Add ferric chloride, zinc acetate, and polyacrylonitrile in a molar ratio of 2:1 to 10 mL of dimethylformamide solution in turn, the weight percentage of polyacrylonitrile in dimethylformamide is 5%, and the iron salt The concentration in dimethylformamide is 0.1 mol / L. The homogeneously mixed precursor solution was filled into a syringe with a metal needle with a diameter of 0.6 mm. Then, the electrospinning was carried out under the electrospinning conditions of a voltage of 20 kV, a bolus injection speed of 1.5 mL / min, and a distance of 20 cm between the needle and the receiver to obtain ZnFe 2 o 4 Precursors of nitrogen-doped carbon nanofibers. Finally, the obtained precursor was heated to 300 °C in air for 2 h, heated to 500 °C in argon, carbonized for 4 h, and heated to 350 °C in air for 2 h to obtain ZnFe 2 o 4 Nitrogen-doped carbon nanofiber composite electrode material.

Embodiment 3

[0035] Add ferric chloride, zinc acetate, and polyacrylonitrile at a molar ratio of 2:1 to 10 mL of dimethylformamide solution in turn, the weight percentage of polyacrylonitrile in dimethylformamide is 15%, and the iron salt The concentration in dimethylformamide is 0.07mol / L. The homogeneously mixed precursor solution was filled into a syringe with a metal needle with a diameter of 0.4 mm. Then, the electrospinning was carried out under the electrospinning conditions of a voltage of 15 kV, a bolus injection speed of 1 mL / min, and a distance of 15 cm between the needle and the receiver to obtain ZnFe 2 o 4 Precursors of nitrogen-doped carbon nanofibers. Finally, the obtained precursor was heated to 270 °C in air for 3 h, heated to 600 °C in argon, carbonized for 3 h, and heated to 300 °C in air for 3 h to obtain ZnFe 2 o 4 Nitrogen-doped carbon nanofiber composite electrode material.

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Abstract

The invention discloses a ZnFe2O4 nitrogen-doped nanometer fiber composite electrode material and a preparation method thereof. The composite material comprises nitrogen-doped carbon nanometer fiber and ZnFe2O4 ultramicro nanoparticles embedded into the nitrogen-doped carbon nanometer fiber. The preparation method is an in-situ growth process and comprises the steps of firstly, mixing a ferric salt, a zinc salt and polyacrylonitrile in a dimethyl formamide solution according to different proportions; secondly, preparing a ZnFe2O4 / nitrogen-doped carbon nanometer fiber precursor by an electrospinning technology; and finally, performing stabilization, carbonization and low-temperature induction on the precursor to obtain the ZnFe2O4 nitrogen-doped nanometer fiber composite electrode material.The ZnFe2O4 / nitrogen-doped nanometer fiber composite electrode material prepared by the method shows high specific capacity, long cycle lifetime and favorable rate performance when used as a supercapacitor electrode material. The method has the characteristics of simple process, low cost, high controllability, industrial production on a large scale and the like.

Description

technical field [0001] The invention relates to a nanocomposite electrode material and a preparation method, in particular to a ZnFe 2 o 4 Nitrogen-doped carbon nanofiber composite electrode material and preparation method thereof. Background technique [0002] As supercapacitor electrode materials, metal oxides are favored by researchers because of their high theoretical specific capacity, rich oxidation states and sufficient raw materials. Among them ZnFe 2 o 4 Due to its relatively high conductivity, environmental friendliness, high specific capacity, and abundant raw materials, it shows great potential as an electrode material for supercapacitors. However, in the application of supercapacitors, in order to achieve good rate performance and long cycle life, ZnFe 2 o 4 The electrical conductivity and stability need to be further improved. [0003] Recently Jiang et al. (ACS Nano 2016, 10 , 2728) reported a ZnFe 2 o 4 A composite material in which nanoparticles are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/36H01G11/86D01D5/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00D01D5/003D01D5/0069D01D5/0092H01G11/24H01G11/30H01G11/36H01G11/86Y02E60/13
Inventor 杨树华韩臻臻孙靖曹丙强
Owner UNIV OF JINAN
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