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Fe3O4/graphene composite material and preparation method thereof

A composite material and graphene technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, structural parts, etc., can solve the problems of high requirements for synthesis equipment, increased production costs, high energy consumption, etc., to achieve high power density, The effect of high energy density

Active Publication Date: 2016-12-21
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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  • Fe3O4/graphene composite material and preparation method thereof
  • Fe3O4/graphene composite material and preparation method thereof
  • 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 / Graphene composite material preparation method, including the following steps:

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

[0047] Weigh 2g graphite powder and 2g sodium nitrate, add 100mL of 98% concentrated sulfuric acid, stir for 15min in an ice bath at 0℃ to make it uniform, then add 12g potassium permanganate, Let stand and cool for 30 minutes in an ice bath, then stir and react for 2 hours in an ice bath to obtain a suspensio...

Embodiment 2

[0050] Fe in this example 3 O 4 / Graphene composite material preparation method, including the following steps:

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

[0052] Weigh 2g graphite powder and 2g sodium nitrate, add 100mL of 98% concentrated sulfuric acid, stir for 15min in an ice bath at 0℃ to make it uniform, then add 12g potassium permanganate, Let stand and cool for 30 minutes under ice bath conditions, and then stir and react for 2 hours under ice bath...

Embodiment 3

[0055] Fe in this example 3 O 4 / Graphene composite material preparation method, including the following steps:

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

[0057] Weigh 2g graphite powder and 2g sodium nitrate, add 100mL of 98% concentrated sulfuric acid, stir for 15min in an ice bath at 0℃ to make it uniform, then add 12g potassium permanganate, Let stand and cool for 30 minutes in an ice bath, then stir and react for 2 hours in an ice bath to obtain a ...

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Abstract

The present invention relates to a Fe3O4/graphene composite material and a preparation method thereof and belongs to the technical field of electrode materials of energy storage devices. The preparation method of the Fe3O4/graphene composite material includes the following steps that: an oxidized graphene emulsion and a Fe(OH)3 sol are uniformly mixed, solid-liquid separation is carried out, so that a Fe(OH)3/oxidized graphene composite material can be prepared; and the prepared Fe(OH)3/oxidized graphene composite material is heated at 200-500 DEG C for 1 to 5 hours under the protection of an inert gas, so that the Fe3O4/graphene composite material can be obtained. According to the preparation method of the Fe3O4/graphene composite material, tight binding of Fe(OH)3 colloidal particles and a GO sheet can be realized through electrostatic forces between the colloidal particles, and effective coating of Fe(OH)3 nanoparticles on graphene can be realized by means of simple mixing; and heat treatment is carried out on the nanocomposite, so that the Fe(OH)3 can be transformed into Fe3O4, and at the same time, the shape of a sandwich structure is retained.

Description

Technical field [0001] The present invention relates to a Fe 3 O 4 / Graphene composite material and preparation method thereof belong 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. Applications in other fields are becoming more and more extensive. 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 they have become application hotspots. [0003] As the application fields of lithium ion batteries and supercapacitors become more and more extensiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/36H01G11/46H01G11/86H01M4/36H01M4/525H01M4/587
CPCH01G11/24H01G11/36H01G11/46H01G11/86H01M4/366H01M4/525H01M4/587Y02E60/10
Inventor 方华王力臻吴仕德李晓峰张爱琴王丽霞
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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