A kind of Fe3O4/graphene composite material and preparation method thereof

A composite material, graphene technology, applied in the manufacture of hybrid/electric double-layer capacitors, hybrid capacitor electrodes, electrical components, etc., can solve problems such as high requirements for synthesis equipment, increase production costs, and difficulty in industrialization, and achieve high power The effect of density, high energy density

Active Publication Date: 2018-08-17
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to prepare Fe 3 o 4 Composite materials that are uniformly and stably dispersed on the surface of graphene, and the reported preparation methods are complex in process, high in energy consumption, and require high synthesis equipment, thereby increasing production costs and making it difficult to realize industrialization

Method used

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  • A kind of Fe3O4/graphene composite material and preparation method thereof
  • A kind of Fe3O4/graphene composite material and preparation method thereof
  • A kind of Fe3O4/graphene composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Fe in this example 3 o 4 / The preparation method of graphene composite material, comprises the steps:

[0046] 1) Prepare an aqueous ferric chloride solution with a concentration of 0.01mol / L, prepare an aqueous urea solution with a concentration of 0.02mol / L, add 20mL of urea aqueous solution to 100mL of ferric chloride solution dropwise, and perform magnetic force during the dropping process Stir, let stand at room temperature for 1 h after the dropwise addition, and then react for 5 h under the condition of heating in a water bath at 80 ° C to obtain bright reddish-brown Fe(OH) 3 Sol, wherein the surface of ferric hydroxide colloidal particles is positively charged;

[0047] Weigh 2g of graphite powder and 2g of sodium nitrate, and add 100mL of concentrated sulfuric acid with a concentration of 98%, and stir for 15min in an ice bath at 0°C to make them evenly mixed, then add 12g of potassium permanganate, Leave to cool in an ice bath for 30 minutes, then stir and ...

Embodiment 2

[0050] Fe in this example 3 o 4 / The preparation method of graphene composite material, comprises the steps:

[0051] 1) Prepare an aqueous ferric chloride solution with a concentration of 0.2mol / L, prepare an aqueous urea solution with a concentration of 0.5mol / L, add 10mL of urea aqueous solution to 100mL of ferric chloride solution dropwise, and perform magnetic force during the dropping process Stir, let stand at room temperature for 5h after the dropwise addition, and then react for 10h under the condition of heating in a water bath at 70°C to obtain bright reddish-brown Fe(OH) 3 Sol, wherein the surface of ferric hydroxide colloidal particles is positively charged;

[0052] Weigh 2g of graphite powder and 2g of sodium nitrate, and add 100mL of concentrated sulfuric acid with a concentration of 98%, and stir for 15min in an ice bath at 0°C to make them evenly mixed, then add 12g of potassium permanganate, Leave to cool in an ice bath for 30 minutes, then stir and react...

Embodiment 3

[0055] Fe in this example 3 o 4 / The preparation method of graphene composite material, comprises the steps:

[0056] 1) Prepare an aqueous ferric chloride solution with a concentration of 0.5mol / L, prepare an aqueous urea solution with a concentration of 1mol / L, add 12.5mL of urea aqueous solution to 100mL of ferric chloride solution dropwise, and perform magnetic force during the dropping process Stir, let stand at room temperature for 10h after the dropwise addition, and then react for 0.5h under the condition of heating in a water bath at 90°C to obtain bright reddish-brown Fe(OH) 3 Sol, wherein the surface of ferric hydroxide colloidal particles is positively charged;

[0057] Weigh 2g of graphite powder and 2g of sodium nitrate, and add 100mL of concentrated sulfuric acid with a concentration of 98%, and stir for 15min in an ice bath at 0°C to make them evenly mixed, then add 12g of potassium permanganate, Leave to cool in an ice bath for 30 minutes, then stir and rea...

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Abstract

The invention relates to a Fe3O4 / graphene composite material and a preparation method thereof, belonging to the technical field of electrode materials for energy storage devices. The preparation method of Fe3O4 / graphene composite material of the present invention comprises the steps: graphene oxide emulsion is mixed with Fe(OH) sol uniformly, and solid-liquid separation is obtained Fe(OH)3 / graphene oxide composite material; The prepared Fe(OH)3 / graphene oxide composite material is heated at 200-500°C for 1-5h under the protection of an inert gas to obtain the obtained product. The preparation method of the present invention realizes the close combination between Fe(OH)3 colloidal particles and GO sheets through the electrostatic force between the colloidal particles, and the bonding of Fe(OH)3 nanoparticles to graphene can be realized only by simple mixing. Effective coverage. Then, by heat-treating the nanocomposite, Fe(OH)3 was transformed into Fe3O4, while the morphology of the sandwich structure was preserved.

Description

technical field [0001] The present invention relates to a kind of Fe 3 o 4 The invention discloses a graphene composite material and a preparation method thereof, belonging to the technical field of electrode materials for energy storage devices. Background technique [0002] In recent years, with the rapid development of the green energy industry, electrochemical energy storage technology has played an increasingly important role in human society and life. Various electrochemical energy storage devices are used in electric vehicles, energy storage, communication power supplies and electronic products. and other fields are becoming more and more widely used. Among them, lithium-ion batteries and supercapacitors have many advantages such as high energy density, high power density, long cycle life, low self-discharge rate and "green" environmental protection, and have become hot spots for application. [0003] As the application fields of lithium-ion batteries and supercapa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/36H01G11/46H01G11/86H01M4/36H01M4/525H01M4/587
CPCH01G11/24H01G11/36H01G11/46H01G11/86H01M4/366H01M4/525H01M4/587Y02E60/10
Inventor 方华王力臻吴诗德李晓峰张爱勤王利霞
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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