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N-doped graphene/nickel ferrite nanometer compound material and preparation thereof

A nitrogen-doped graphene, nanocomposite material technology, applied in nanotechnology, nanotechnology, hybrid/electric double layer capacitor manufacturing and other directions, can solve the problem that the electrochemical performance cannot meet the requirements of practical applications, the electrochemical performance is not ideal, The equipment required for the reaction is complex and other problems, so as to improve the electrochemical performance, facilitate low-cost large-scale production, and achieve the effect of excellent electrochemical performance.

Inactive Publication Date: 2014-06-18
NANJING UNIV OF SCI & TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] 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 Graphene for 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. Complex equipment, harsh reaction conditions, and low output are required; although the obtained nitrogen-doped graphene has improved its electrical conductivity compared with graphene, its electrochemical properties (such as Specific capacitance) is far from meeting the requirements of practical applications
Nickel ferrite is one of the ferrite metal oxides. It has been widely concerned because of its unique properties. However, nickel ferrite alone also has corresponding defects. In order to improve its performance, it is also necessary to combine it with carbon materials. It has become a research hotspot (Synthesis of graphene-NiFe 2 o 4 nanocomposites and their electrochemical capacitive behavior, Journal of Materials Chemistry A, 2013, 6393-6399.), but its electrochemical performance (specific capacitance and cycle performance) is still not ideal
[0004] Combining modified carbon materials with nickel ferrite to prepare nitrogen-doped graphene / nickel ferrite binary nanocomposites has not been reported yet

Method used

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  • N-doped graphene/nickel ferrite nanometer compound material and preparation thereof
  • N-doped graphene/nickel ferrite nanometer compound material and preparation thereof
  • N-doped graphene/nickel ferrite nanometer compound material and preparation thereof

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Embodiment 1

[0022] Implementation example 1: the preparation method of a nitrogen-doped graphene / nickel ferrite nanocomposite material (the mass ratio of graphite oxide to nickel ferrite is 1:1) with a nitrogen content of 1%, comprising the following steps:

[0023] In the first step, ultrasonically disperse graphite oxide with a content of 100mg in 200mL deionized water to obtain a uniform graphene oxide solution, and the ultrasonic time is 2h;

[0024] In the second step, 0.3453g of ferric nitrate and 0.1243g of nickel nitrate were added to the uniformly dispersed solution, and stirred for 30min;

[0025] In the third step, add 10 g of urea into the mixed system obtained in the second step, and stir again for 30 minutes to make it evenly dispersed;

[0026] Step 4: Transfer the uniformly mixed solution above to a three-necked flask, the temperature of the oil bath is 150°C, and the reaction time is 16 hours;

[0027] Step 5: Centrifuge the reacted product, wash it with deionized water ...

Embodiment 2

[0029] Implementation example 2: the preparation method of a nitrogen-doped graphene / nickel ferrite nanocomposite material (the mass ratio of graphite oxide to nickel ferrite is 1:10) with a nitrogen content of 2%, comprising the following steps:

[0030] In the first step, ultrasonically disperse graphite oxide with a content of 50 mg in 100 mL of deionized water to obtain a uniform graphene oxide solution, and the ultrasonic time is 1 h;

[0031] In the second step, 1.7266g of ferric nitrate and 0.6214g of nickel nitrate were added to the uniformly dispersed solution, and stirred for 10min;

[0032] In the third step, add 10 g of urea into the mixed system obtained in the second step, and stir again for 60 minutes to make it evenly dispersed;

[0033] Step 4: Transfer the above-mentioned homogeneously mixed mixed solution to a three-necked flask, the temperature of the oil bath is 100°C, and the reaction time is 20h;

[0034] Step 5: Centrifuge the reacted product, wash it ...

Embodiment 3

[0036] Implementation example 3: the preparation method of a nitrogen-doped graphene / nickel ferrite nanocomposite material (the mass ratio of graphite oxide to nickel ferrite is 1:5) with a nitrogen content of 1.5%, comprising the following steps:

[0037] In the first step, ultrasonically disperse graphite oxide with a content of 100mg in 100mL deionized water to obtain a uniform graphene oxide solution, and the ultrasonic time is 4h;

[0038] In the second step, 1.7266g of ferric nitrate and 0.6214g of nickel nitrate were added to the uniformly dispersed solution, and stirred for 60min;

[0039] In the third step, 15g of urea was added to the mixed system obtained in the second step, and stirred again for 90 minutes to make it uniformly dispersed;

[0040] Step 4: Transfer the uniformly mixed solution above to a three-necked flask, the temperature of the oil bath is 200°C, and the reaction time is 12 hours;

[0041] Step 5: Centrifuge the reacted product, wash it with deion...

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Abstract

The invention discloses an N-doped graphene / nickel ferrite nanometer compound material and a preparation method thereof. The preparation method comprises the following steps: performing ultrasonic dispersion on graphite oxide in water, thereby acquiring a graphite oxide solution; adding ferric nitrate and nickel nitrate into the graphite oxide solution and continuing to perform ultrasonic dispersion; adding urea into the mixed solution; transferring the mixed solution into a three-neck flask; after oil-bath heating reaction, centrifugally washing and drying a product, thereby acquiring the N-doped graphene / nickel ferrite nanometer compound material. According to the method, the urea is adopted for reducing the graphite oxide; while reducing, nitrogen atoms are doped on the surface of the graphene; the surface chemical property of the graphene is changed and the surface defect of a chemical method for preparing the graphene is overcome by the doping of the nitrogen atoms; alkalinity is supplied through the urea hydrolysis, so that nickel ferrite is formed on the surface of the N-doped graphene; the accumulation and agglomeration of the graphene in layers can be further stopped by the nanometer particles of the nickel ferrite, so that the electrochemical property of the compound material is increased.

Description

technical field [0001] The invention belongs to the field of nanocomposite material preparation, in particular to a nitrogen-doped graphene / nickel ferrite nanocomposite material and its preparation. Background technique [0002] After mankind entered the 21st century, due to economic and population growth, the demand for energy has increased sharply, but traditional fossil energy is on the verge of disappearing, so some sustainable and renewable new energy is urgently needed to solve the current problem. New energy materials are key materials to realize energy conversion and application, which mainly include energy conversion materials, energy storage materials, etc. Among the commonly used energy storage materials are carbon materials, metal oxides and conductive polymers. Graphene is a kind of carbon material, which has aroused an upsurge of research because of its unique properties. However, graphene alone has limited performance and cannot meet the requirements of new ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/42H01G11/32H01G11/36H01G11/30H01G11/86B82Y30/00B82Y40/00
Inventor 郝青丽王文娟夏锡锋雷武姚超汪信
Owner NANJING UNIV OF SCI & TECH
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