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Nitrogen-doped graphene/cobalt ferrite nano composite material and preparation method thereof

A technology of nitrogen-doped graphene and nanocomposite materials, which is applied in the fields of nanostructure manufacturing, iron compounds, nanotechnology, etc., can solve the problems of unsatisfactory electrochemical performance, limited application, poor cyclability, etc., and achieve improved electrochemical performance. , improve defects, low production cost effect

Active Publication Date: 2014-06-18
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its poor cycle performance limits its application in energy storage materials. Xia et al. improved its cycle performance by combining cobalt ferrite with graphene, (CoFe2O4-graphene nanocomposite as a high-capacity anode material for lithium-ion batteries.Electrochimica Acta,2012,83,166-174.), but its electrochemical performance (specific capacitance and cycle performance) is still not ideal
[0005] At present, the nitrogen-doped graphite / cobalt ferrite binary nanocomposite has not been reported

Method used

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  • Nitrogen-doped graphene/cobalt ferrite nano composite material and preparation method thereof
  • Nitrogen-doped graphene/cobalt ferrite nano composite material and preparation method thereof
  • Nitrogen-doped graphene/cobalt ferrite nano composite material and preparation method thereof

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Embodiment 1

[0025] Implementation Example 1: The preparation method of a nitrogen-doped graphene / cobalt ferrite nanocomposite material (the mass ratio of graphite oxide to cobalt ferrite is 1:3) with a nitrogen content of 1%, comprising the following steps:

[0026] In the first step, ultrasonically disperse graphite oxide with a content of 100 mg in 50 mL of absolute ethanol to obtain a uniform graphene oxide solution, and the ultrasonic time is 1 h;

[0027] In the second step, dissolve 1.0333g of ferric nitrate and 0.3722g of cobalt nitrate in 20mL of ethanol and stir for 10min;

[0028] In the third step, the above-mentioned dissolved mixed metal salt solution is poured into the graphene oxide solution obtained in the first step, and stirred for 10 minutes to make it evenly mixed;

[0029] In the fourth step, add 10 g of urea into the mixed system obtained in the third step, and stir again for 30 minutes to make it evenly dispersed;

[0030] The fifth step is to transfer the uniforml...

Embodiment 2

[0033] Implementation Example 2: The preparation method of a nitrogen-doped graphene / cobalt ferrite nanocomposite material with a nitrogen content of 1.5% (the mass ratio of graphite oxide to cobalt ferrite is 1:5), comprising the following steps:

[0034] In the first step, ultrasonically disperse graphite oxide with a content of 100 mg in 50 mL of absolute ethanol to obtain a uniform graphene oxide solution, and the ultrasonic time is 2 h;

[0035] In the second step, dissolve 1.7222g of ferric nitrate and 0.6203g of cobalt nitrate in 20mL of ethanol and stir for 30min;

[0036] In the third step, the above-mentioned dissolved mixed metal salt solution is poured into the graphene oxide solution obtained in the first step, and stirred for 30 minutes to make it evenly mixed;

[0037] In the fourth step, 15g of urea was added to the mixed system obtained in the third step, and stirred again for 60 minutes to make it uniformly dispersed;

[0038] The fifth step is to transfer t...

Embodiment 3

[0041] Implementation Example 3: The preparation method of a nitrogen-doped graphene / cobalt ferrite nanocomposite material with a nitrogen content of 2% (the mass ratio of graphite oxide to cobalt ferrite is 1:10), comprising the following steps:

[0042] In the first step, ultrasonically disperse graphite oxide with a content of 100 mg in 50 mL of absolute ethanol to obtain a uniform graphene oxide solution, and the ultrasonic time is 3 h;

[0043] In the second step, dissolve 3.4443g of ferric nitrate and 1.2406g of cobalt nitrate in 20mL of ethanol and stir for 60min;

[0044]In the third step, the above-mentioned dissolved mixed metal salt solution is poured into the graphene oxide solution obtained in the first step, and stirred for 60 minutes to make it evenly mixed;

[0045] In the fourth step, 20 g of urea was added to the mixed system obtained in the third step, and stirred again for 90 minutes to make it uniformly dispersed;

[0046] The fifth step is to transfer th...

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Abstract

The invention discloses a nitrogen-doped graphene / cobalt ferrite nano composite material and a preparation method thereof. The preparation method comprises the following steps: putting graphite oxide into absolute ethyl alcohol and carrying out ultrasonic treatment; adding cobalt nitrate and iron nitrate into the absolute ethyl alcohol; adding a dissolved metal salt solution into a graphene oxide solution to carry out ultrasonic dispersion again; adding urea into the uniformly-dispersed mixed solution; agitating and dissolving; finally, carrying out a hydro-thermal synthesis reaction on the mixed solution; after the reaction is finished, centrifugally washing and drying a product to obtain a composite material. According to the preparation method, the urea is used for reducing graphene oxide; in the reduction process, nitrogen atoms are doped on the surface of graphene; the doping of nitrogen atoms changes the surface chemical properties of the graphene to make up the surface defects formed by preparing the graphene by a chemical method; the alkalinity provided by the urea enables cobalt ferrite to be formed on the surface of the nitrogen-doped graphene; nano particles of the cobalt ferrite can further prevent layers of the graphene from being accumulated and reunited, and the electrochemical performance of the composite mateial is improved.

Description

technical field [0001] The invention belongs to the field of nanocomposite material preparation, in particular to a nitrogen-doped graphene / cobalt ferrite nanocomposite material and its preparation. Background technique [0002] Since the birth of the new carbon material graphene in 2004, its unique structure (larger specific surface area) and photoelectric properties (excellent electrical conductivity) have attracted widespread attention. At present, graphene has been widely used in energy storage Devices (supercapacitors, lithium-ion batteries, fuel cells, etc.) and other fields. At present, there are many methods for the preparation of graphene. Among them, the chemical method of oxidation-reduction to prepare graphene is widely used because of its high production yield. However, the graphene obtained by this method has defects and is easy to agglomerate, which limits the application of graphene. Some researchers overcome the problem of agglomeration between graphene int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B82B1/00B82B3/00C01B31/04C01G49/00B82Y40/00B82Y30/00C01B32/192
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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