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ZnFe2O4/C composite nanometer fiber super capacitor electrode material and preparation method thereof

A technology of composite nanofibers and supercapacitors, which is applied in the fields of hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, nanotechnology, etc., can solve the problems of poor rate performance and cycle stability, and easy falling off of electrode materials, and achieves a simple preparation method easy effect

Inactive Publication Date: 2017-10-10
UNIV OF JINAN
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although researchers have prepared nano-ZnFe with good specific capacitance performance 2 o 4 electrode material, but nano ZnFe 2 o 4 The electrode material is easy to fall off during the redox reaction, resulting in poor rate performance and cycle stability, which limits its application in supercapacitors

Method used

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  • ZnFe2O4/C composite nanometer fiber super capacitor electrode material and preparation method thereof
  • ZnFe2O4/C composite nanometer fiber super capacitor electrode material and preparation method thereof
  • ZnFe2O4/C composite nanometer fiber super capacitor electrode material and preparation method thereof

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Effect test

Embodiment 1

[0029] 0.4 mmol ferric chloride hexahydrate, 0.2 mmol anhydrous zinc chloride, 0.5 g PAN and 10 mL DMF were mixed and stirred evenly to fully dissolve the solid matter to obtain the precursor sol. The above precursor sol was placed in a syringe connected to a high-voltage DC power supply. The diameter of the pinhole nozzle was 0.5 nm, the applied voltage was set to 15 kV, and the injection speed was set to 0.04 mm / min. Electrospinning was started to prepare PAN / ZnCl 2 / FeCl 3Precursor composite nanofiber mat, drying. The dried samples were placed in a tube furnace to undergo three steps of pre-oxidation treatment, calcination in a low-temperature air atmosphere, and calcination in a high-temperature Ar atmosphere: the first step was pre-oxidation heat treatment, and the temperature was kept at 250 °C for 4 h in an air atmosphere. 5 ℃ / min; the second step is calcination in low-temperature air atmosphere, 400 ℃ for 4 h, and the heating rate is 5 ℃ / min; the third step is calci...

Embodiment 2

[0031] 0.4 mmol ferric chloride hexahydrate, 0.2 mmol anhydrous zinc chloride, 1 g PAN and 10 mL DMF were mixed and stirred evenly to fully dissolve the solid matter to obtain the precursor sol. The above precursor sol was placed in a syringe connected to a high-voltage DC power supply. The diameter of the pinhole nozzle was 0.6 nm, the applied voltage was set to 16 kV, and the injection speed was set to 0.07 mm / min. Electrospinning was started to prepare PAN / ZnCl 2 / FeCl 3 Precursor composite nanofiber mat, drying. The dried samples were placed in a tube furnace and gradually underwent three-step heat treatment: pre-oxidation treatment, calcination in a low-temperature air atmosphere, and calcination in a high-temperature Ar atmosphere: the first step was pre-oxidation heat treatment, and the temperature was kept at 270 °C for 3 h in an air atmosphere. 5 ℃ / min; the second step is calcination in low-temperature air atmosphere, 450 ℃ for 3 h, and the heating rate is 5 ℃ / min;...

Embodiment 3

[0033] 0.4 mmol ferric chloride hexahydrate, 0.2 mmol anhydrous zinc chloride, 1.5 g PAN and 10 mL DMF were mixed and stirred evenly to fully dissolve the solid matter to obtain the precursor sol. The above precursor sol was placed in a syringe connected to a high-voltage DC power supply. The diameter of the pinhole nozzle was 0.7 nm, the applied voltage was set to 17 kV, and the injection speed was set to 0.1 mm / min. Electrospinning was started to prepare PAN / ZnCl 2 / FeCl 3 Precursor composite nanofiber mat, drying. The dried samples were placed in a tube furnace and gradually underwent three-step heat treatment: pre-oxidation treatment, calcination in a low-temperature air atmosphere, and calcination in a high-temperature Ar atmosphere: the first step was pre-oxidation heat treatment, and the temperature was kept at 300 °C for 2 h in an air atmosphere. 5 ℃ / min; the second step is calcination in low-temperature air atmosphere, holding at 500 ℃ for 2 h, and the heating rate...

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Abstract

The invention discloses a ZnFe2O4 / C composite nanometer fiber super capacitor electrode material and a preparation method thereof; the preparation method comprises the following steps: using a magnetic stirring method to evenly spread ferric chloride hexahydrate, waterless zinc chloride and PAN into a DMF solution; then using a static spinning technology to prepare a PAN / Znl2 / FeCl3 precursor composite nanometer fibrofelt, and drying same; finally, carrying out three steps of heat treatments for the dried sample so as to obtain the ZnFe2O4 / C composite nanometer fiber super capacitor electrode material, wherein the heat treatments comprise pre-oxidation treatment, low temperature air atmosphere calcining, and high temperature Ar atmosphere calcining. The prepared ZnFe2O4 / C composite nanometer fiber is an ultrafine continuous fiber with a stable frame structure, the fiber diameter is controlled as dozens of nanometer to hundreds of nanometer, and the ZnFe2O4 / C nanometer particles embedded in the fiber are evenly distributed. The ZnFe2O4 / C composite nanometer fiber structure is good in stability and conductivity, can fast discharge electricity, and has excellent electrochemistry performance.

Description

technical field [0001] The invention relates to the field of nanomaterial preparation, in particular to a ZnFe 2 o 4 / C composite nanofiber supercapacitor electrode material and preparation method thereof. Background technique [0002] With the deteriorating energy crisis and environmental pollution, the research and development of new energy storage materials and energy storage devices has become a hot research topic today. Supercapacitors, with their high power density, fast charging and discharging, and long cycle life, are considered to be able to partially replace traditional chemical batteries for traction power and starting power of vehicles. Electrode materials, as the focus of supercapacitors, can be divided into electric double layer electrode materials and pseudocapacitive electrode materials according to the principle of energy storage. Metal oxide electrode materials have become the most concerned pseudocapacitive electrode materials due to their higher elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/36H01G11/46H01G11/24D01F9/08B82Y30/00
CPCY02E60/13H01G11/86B82Y30/00D01F9/08H01G11/24H01G11/36H01G11/46
Inventor 韩臻臻杨树华曹丙强孙靖
Owner UNIV OF JINAN
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