A nitrogen-doped graphene/manganese ferrite nanocomposite material and its preparation

A nitrogen-doped graphene, manganese ferrite nanotechnology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of limited application of specific capacitance, harsh reaction conditions, and high production costs , to achieve the effect of facilitating low-cost large-scale production, excellent electrochemical performance, and improving electrochemical performance

Active Publication Date: 2017-02-08
NANJING UNIV OF SCI & TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the lower specific capacitance limits its application in supercapacitors. In order to improve the performance, the corresponding modification, doping and compounding of graphene has become a research hotspot.
People such as Klaus Müllen doped nitrogen and boron simultaneously on the surface of graphene by hydrothermal method (Three-Dimensional Nitrogen and Boron Co-doped Graphenefor High-Performance All-Solid-State Supercapacitors.Advanced Materials2012,24(37):5130 -5135.); Chinese patents (CN103274393A, CN102760866A, CN103359708A, CN103359711A and CN102167310A, etc.) introduce nitrogen sources through different chemical methods, and prepare nitrogen-doped graphene. Complicated equipment, harsh reaction conditions, and low yield; although the obtained nitrogen-doped graphene has improved its electrical conductivity compared with graphene, its electrochemical properties (such as Capacitance) is far from meeting the requirements of practical applications
[0004] As a kind of metal oxide, manganese ferrite has high specific capacitance, but its poor cycle stability limits its application. In order to improve its stability, it is compounded with carbon materials, but the obtained binary The electrochemical performance of the material still cannot be applied in high-performance energy storage elements
[0005] So far, nitrogen-doped graphene / manganese ferrite binary electrode materials have not been reported

Method used

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  • A nitrogen-doped graphene/manganese ferrite nanocomposite material and its preparation
  • A nitrogen-doped graphene/manganese ferrite nanocomposite material and its preparation
  • A nitrogen-doped graphene/manganese ferrite nanocomposite material and its preparation

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Embodiment 1

[0024] Embodiment 1: the preparation method of nitrogen-doped graphene / manganese ferrite nanocomposite material (mass ratio of graphite oxide and manganese ferrite is 1:1) with nitrogen doping amount of 1%, comprising the following steps:

[0025] The first step is to ultrasonically disperse 50 mg of graphite oxide in 100 mL of absolute ethanol to obtain a uniform graphene oxide solution, and the ultrasonic time is 1 h;

[0026] In the second step, pour the weighed 0.1752g ferric nitrate and 0.0542g manganese nitrate into the above-mentioned uniformly dispersed mixed solution, and stir for 10min;

[0027] In the third step, 5g of urea was added to the obtained mixed system, and stirred again for 30min to make it evenly dispersed;

[0028] In the fourth step, the obtained mixed solution was transferred into a flask and reacted under the condition of 200°C for 12h;

[0029] The fifth step: the obtained product is centrifuged, washed and dried to obtain a nitrogen-doped graphene...

Embodiment 2

[0031] Embodiment 2: The preparation method of nitrogen-doped graphene / manganese ferrite nanocomposite material with nitrogen doping amount of 1.5% (mass ratio of graphite oxide and manganese ferrite is 1:5), comprising the following steps:

[0032] The first step is to ultrasonically disperse 80 mg of graphite oxide in 100 mL of absolute ethanol to obtain a uniform graphene oxide solution, and the ultrasonic time is 2 h;

[0033] In the second step, pour the weighed 1.4015g ferric nitrate and 0.4336g manganese nitrate into the above-mentioned uniformly dispersed mixed solution, and stir for 20min;

[0034] In the third step, 15g of urea was added to the obtained mixed system, and stirred again for 40min to make it evenly dispersed;

[0035] In the fourth step, the obtained mixed solution was transferred into a flask and reacted at 180°C for 16h;

[0036] The fifth step: the obtained product is centrifuged, washed and dried to obtain a nitrogen-doped graphene / manganese ferrit...

Embodiment 3

[0038] Example 3: The preparation method of the nitrogen-doped graphene / manganese ferrite nanocomposite material with a nitrogen doping amount of 2% (the mass ratio of graphite oxide to manganese ferrite is 1:10) includes the following steps:

[0039] The first step is to ultrasonically disperse 100 mg of graphite oxide in 100 mL of absolute ethanol to obtain a uniform graphene oxide solution, and the ultrasonic time is 3h;

[0040] In the second step, pour the weighed 3.5036g ferric nitrate and 1.0840g manganese nitrate into the above-mentioned uniformly dispersed mixed solution, and stir for 30min;

[0041] In the third step, 20g of urea was added to the obtained mixed system, and stirred again for 60min to make it evenly dispersed;

[0042] In the fourth step, the obtained mixed solution was transferred into a flask and reacted at 120°C for 20h;

[0043] The fifth step: the obtained product is centrifuged, washed and dried to obtain a nitrogen-doped graphene / manganese ferr...

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Abstract

The invention discloses a preparation method of a nanocomposite material of nitrogen doped with graphene / manganese ferrite. The method comprises the steps that prepared graphite oxides are put in absolute ethyl alcohol for conducting ultrasonic dispersion; afterwards, weighed manganous nitrate and ferric nitrate are added into the above dispersion solution and stirred until the manganous nitrate and the ferric nitrate are completely dissolved; at last, a certain amount of urea is added in the mixed solution, after the urea is stirred and dissolved, the mixed solution is moved into a flask, and the nanocomposite material of the nitrogen doped with the grapheme / manganese ferrite can be obtained after reaction. According to the nanocomposite material of the nitrogen doped with the graphene / manganese ferrite and the preparation method thereof, the urea is used for reduction of the graphite oxides, in the reduction process, nitrogen atoms are doped on the surface of graphene, the doping of the nitrogen atoms changes the surface chemical property of the graphene, and the alkalinity of the urea enables the manganese ferrite to be formed on the surface of the nitrogen doped with the graphene while the surface defect of the graphene prepared through a chemical method is overcome. Manganese ferrite nano particles can further prevent graphene from being piled up together between layers, and the electrochemical property of the nanocomposite material of the nitrogen doped with the graphene / manganese ferrite is improved.

Description

technical field [0001] The invention belongs to the field of nanocomposite material preparation, in particular to a nitrogen-doped graphene / manganese ferrite nanocomposite material and preparation thereof. Background technique [0002] Due to environmental pollution and loss of fossil energy, it is urgent to invent an environmentally friendly high-performance energy storage element. Supercapacitor is a new type of energy storage element with high energy density, long cycle life and environmental friendliness, in which the electrode material is the most important factor determining the energy storage performance of supercapacitor. [0003] Graphene is a new type of two-dimensional planar carbonaceous nanomaterials discovered and synthesized in recent years. Due to its novel physical and chemical properties, graphene has become a high-profile scientific star and a major research hotspot in the field of nanomaterials. However, the low specific capacitance limits its applicati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/46B82Y30/00B82Y40/00
Inventor 郝青丽王文娟夏锡锋雷武汪信姚超
Owner NANJING UNIV OF SCI & TECH
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