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Graphene three-dimensional material as well as preparation method and application thereof

A graphene and structure technology, applied in the field of graphene, to achieve the effects of good electrical conductivity and strength, adjustable shape and size, and easy operation

Active Publication Date: 2011-03-02
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Graphene has many peculiar properties, but graphene alone is only a few nanometers thick, and there are many inconveniences in practical applications

Method used

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  • Graphene three-dimensional material as well as preparation method and application thereof
  • Graphene three-dimensional material as well as preparation method and application thereof
  • Graphene three-dimensional material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Weigh 100mg of graphite oxide powder material into a 150mL beaker, add 100mL of deionized water, ultrasonically disperse for 2 hours, and ultrasonic power is 100W, to obtain a well-dispersed graphene oxide solution. Then, 5 mL of ammonia water was added under stirring condition to adjust the pH to 10. Then add 5 mL of potassium permanganate solution with a mass concentration of 40%, and continue to sonicate for 20 min to make it evenly mixed. Under ultrasonic conditions, 60 μL of 80% hydrazine hydrate solution was added, and stirring was continued for 2 h after the addition was completed to obtain a uniformly dispersed solution. The above solution was moved into a drying oven at a temperature of 70° C. for 12 hours, and finally freeze-dried to obtain a three-dimensional macroscopic material composed of graphene self-assembly. Instructions attached figure 1 The photo of the graphene three-dimensional structure material prepared for the present embodiment, figure 2 It...

Embodiment 2

[0021] Weigh 50mg of graphite oxide powder material into a 100mL beaker, add 80mL of water, ultrasonically disperse for 2h, ultrasonic power 200W, to obtain a well-dispersed graphene oxide solution. Then, 1 mL of ammonia water was added under stirring condition to adjust the pH to 11. Then add 10 mL of nickel nitrate solution with a mass concentration of 80%, and continue to sonicate for 50 min to make it evenly mixed. Under ultrasonic conditions, 5 μL of 80% hydrazine hydrate solution was added, and stirring was continued for 2 h after the addition was completed to obtain a uniformly dispersed solution. The above solution was moved into a drying oven at 70° C. for 18 hours, and finally freeze-dried to obtain a three-dimensional macroscopic material composed of graphene self-assembly. According to the method for preparing a supercapacitor as described in Example 1, the supercapacitor of the graphene three-dimensional bulk material prepared in this embodiment is prepared, and ...

Embodiment 3

[0023] Weigh 150mg of graphite oxide powder material into a 200mL beaker, add 150mL of water, ultrasonically disperse for 2h, ultrasonic power 150W, to obtain a well-dispersed graphene oxide solution. Then, 10 mL of ammonia water was added under stirring condition to adjust pH=8. Then add 20 mL of manganese acetate solution with a mass concentration of 20%, and continue to sonicate for 50 min to make it evenly mixed. Under ultrasonic conditions, add 100 μL of 80% hydrazine hydrate solution, and continue ultrasonication for 20 h after addition to obtain a uniformly dispersed solution. The above solution was transferred into a hydrothermal reaction kettle and reacted at 120°C for 24h. Finally, a macroscopic material with a three-dimensional structure composed of graphene self-assembly is obtained by vacuum drying. According to the method for preparing supercapacitors described in Example 1, the supercapacitor of the graphene three-dimensional structure material prepared in thi...

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Abstract

The invention discloses a graphene three-dimensional material as well as a preparation method and an application thereof. The material consists of 10 to 99% of graphene and 1 to 90% of the oxide of manganese, nickel, iron or cobalt. The preparation method comprises the following steps: performing ultrasonic dispersion on graphite oxide to prepare a graphite oxide solution; adding a metal salt solution while stirring or under ultrasonic conditions, and adding a hydrazine hydrate solution; conducting reaction in a drying oven or a hydro-thermal reaction kettle; and then drying to obtain the graphene three-dimensional material. The graphene three-dimensional material is applied to a super capacitor with the capacity of 200 to 800 F / g, or used for making the cathode of a lithium ion battery with the capacity of 300 to 1,400 mAh / g. According to the invention, the preparation process is simple; the prepared graphene three-dimensional macroscopic material has high conductivity and strength; and when being used for the cathode of the lithium ion battery and the super capacitor, the material has high performance.

Description

technical field [0001] The invention relates to a graphene three-dimensional structure material and a preparation method and application thereof, belonging to graphene technology. Background technique [0002] Graphene is a two-dimensional carbonaceous crystal discovered in recent years, and it is one of the research hotspots in the field of carbonaceous materials and condensed matter physics. Graphene is the construction of zero-dimensional fullerene, one-dimensional carbon nanotubes, three-dimensional bulk graphite and other sp 2 The basic structural unit of hybrid carbon. Graphene has many peculiar properties, but graphene alone is only a few nanometers thick, and there are many inconveniences in practical applications. Assembling materials with nanostructures into bulk materials is a key step in the application of nanomaterials and an important way for the large-scale application of nanomaterials. When nanomaterials are assembled into bulk materials, the peculiar prop...

Claims

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Application Information

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IPC IPC(8): C01B31/04
CPCY02E60/122Y02E60/10Y02E60/13
Inventor 杨全红吕伟周志倪旺郭煦昀
Owner TIANJIN UNIV
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