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Co-Fe alloy/graphene compound material, as well as preparation method and application thereof

A composite material and graphene technology, applied in the field of electrochemistry, can solve the problems of difficult to obtain uniform composite materials in composite state, easy agglomeration of nanoparticles, etc., and achieve the effect of improving electrochemical performance and broad development prospects.

Active Publication Date: 2017-05-31
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the first two methods, the mechanical mixing method is simple to implement, but it is not easy to obtain a composite material with a uniform composite state; while the in-situ growth method has high requirements on operating conditions, and the prepared nanoparticles are also easy to agglomerate

Method used

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  • Co-Fe alloy/graphene compound material, as well as preparation method and application thereof
  • Co-Fe alloy/graphene compound material, as well as preparation method and application thereof
  • Co-Fe alloy/graphene compound material, as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Graphene oxide was prepared by the improved Hummers method, 300mg graphene oxide was mixed with 400mL deionized water, and the mixture obtained by the two was ultrasonically dispersed for 6 h, and the solution was irradiated with a flashlight beam, and no Obvious particle aggregates indicate that graphene oxide is well dispersed in aqueous solution, thereby obtaining a uniformly dispersed yellow-brown graphene oxide dispersion;

[0026] (2) Dissolve 1g of yellow-brown 1,1'-ferrocenecarboxylic acid powder and 1g of pink cobalt acetate tetrahydrate powder in the graphene oxide dispersion obtained in step (1) at room temperature, stir, Until all the solids are dissolved, the solution turns from yellowish brown to black red;

[0027] (3) Put the yellow-brown solution obtained in step (2) into a constant temperature magnetic stirring water bath, control the constant temperature of the water bath at 70°C, turn on the magnetic stirring, and add sodium hydroxide solution (0...

Embodiment 2

[0039] (1) Prepare graphene oxide by the improved Hummers method, mix 0.2mg graphene oxide with 300mL deionized water, and ultrasonically disperse the resulting mixture for 4 h. Obvious particle aggregates are found, indicating that graphene oxide is well dispersed in aqueous solution, thereby obtaining a uniformly dispersed yellow-brown graphene oxide dispersion;

[0040] (2) Dissolve 1g of yellow-brown 1,1'-ferrocenecarboxylic acid powder and 5g of pink cobalt acetate tetrahydrate powder in the graphene oxide dispersion obtained in step (1) at room temperature, stir, Until all the solids are dissolved, the solution turns from yellowish brown to black red;

[0041] (3) Put the yellow-brown solution obtained in step (2) into a constant temperature magnetic stirring water bath, control the constant temperature of the water bath at 30°C, turn on the magnetic stirring, and add sodium hydroxide solution (0.3M) dropwise during the stirring process to adjust the pH of the solution ...

Embodiment 3

[0045] (1) Prepare graphene oxide by the improved Hummers method, mix 0.7mg graphene oxide with 400mL deionized water, and ultrasonically disperse the resulting mixture for 8 h. Obvious particle aggregates are found, indicating that graphene oxide is well dispersed in aqueous solution, thereby obtaining a uniformly dispersed yellow-brown graphene oxide dispersion;

[0046] (2) Dissolve 1g of yellow-brown 1,1'-ferrocenecarboxylic acid powder and 9g of pink cobalt acetate tetrahydrate powder in the graphene oxide dispersion obtained in step (1) at room temperature, stir, Until all the solids are dissolved, the solution turns from yellowish brown to black red;

[0047] (3) Put the yellow-brown solution obtained in step (2) into a constant temperature magnetic stirring water bath, control the constant temperature of the water bath at 50°C, turn on the magnetic stirring, and add sodium hydroxide solution (0.5M) dropwise during the stirring process to adjust the pH of the solution ...

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Abstract

The invention belongs to the technical field of electrochemistry, and discloses a Co-Fe alloy / graphene compound material, as well as a preparation method and application thereof. The method comprises the following steps: ultrasonically dispersing graphene oxide into water; stirring and dissolving 1,1'-ferrocenecarboxylic acid and cobalt acetate tetrahydrate in the graphene oxide dispersion liquid at room temperature; controlling the temperature to be 20-80 DEG C, adding alkali into the prepared solution under a stirring state, adjusting the pH value of the solution to be 4-12, and stirring for 2-10 hours; transferring the obtained system into a hydrothermal reactor, performing hydrothermal treatment for 48-72 hours at 40-200 DEG C, cooling to room temperature, taking out the reaction liquid, separating to obtain precipitate, and drying the precipitate; grinding, and calcining the ground powder under nitrogen atmosphere at 400-600 DEG C for 2-8 hours to obtain the Co-Fe alloy / graphene compound material. The Co-Fe alloy / graphene compound material prepared by the method is used as an electrode material of a super capacitor, and the electrochemical performance of the capacitor is greatly promoted, so that the Co-Fe alloy / graphene compound material has a wide development prospect.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a Co-Fe alloy / graphene composite material and a preparation method and application thereof. Background technique [0002] Graphene is a two-dimensional sheet material with high specific surface area and excellent electrical conductivity. It has a wide range of applications in the field of electrochemistry. The combination of Co-Fe alloy and graphene greatly improves its electrochemical performance. At present, the methods for composite metal alloys based on graphene mainly include: mechanical mixing method, in-situ growth method, etc. For the first two methods, the mechanical mixing method is simple to implement, but it is not easy to obtain a composite material with a uniform composite state; while the in-situ growth method has high requirements on operating conditions, and the prepared nanoparticles are also easy to agglomerate. [0003] Supercapacitors (o...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/24H01G11/30
CPCY02E60/13H01G11/86H01G11/24H01G11/30
Inventor 刘玉山陈宁李昱东丁洁刘源吴晗苏玉伟李保军刘仲毅卢思宇
Owner ZHENGZHOU UNIV
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