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Graphene-based hierarchical porous carbon material as well as preparation method and application thereof

A graphene, graphene suspension technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of large specific surface area, high porosity, high energy consumption, avoid overlapping agglomeration, high thermal conductivity performance effect

Active Publication Date: 2015-04-01
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the product obtained by this process has high porosity, large specific surface area, and excellent electrochemical performance, it also has high energy consumption, and graphene oxide is difficult to produce on a large scale as a raw material.

Method used

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  • Graphene-based hierarchical porous carbon material as well as preparation method and application thereof
  • Graphene-based hierarchical porous carbon material as well as preparation method and application thereof
  • Graphene-based hierarchical porous carbon material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Adopt application number 201310659172.5, named as a method for preparing graphene by electrochemically swelling graphite. The carbon / oxygen atomic ratio of the graphene sample obtained in Example 2 in the patent is 71%, and the graphene unit reaches 200 microns × 200 microns, 70% of the sample The number of graphene layers is 2-3 atomic layers. Commercial microcrystalline cellulose (particle size 10 μm) was used as raw material. Disperse the graphene powder in the water solvent, under ultrasonic conditions: power 60 watts (60 W), time 5 minutes (5 min), temperature maintained at 25 degrees Celsius (25 degrees Celsius), to prepare a uniformly dispersed graphene suspension, Its concentration is 0.3 mg / mL. Disperse the microcrystalline cellulose powder in the water solvent, under ultrasonic conditions: power 50 watts (50 W), time 5 minutes (5 min), temperature maintained at 25 degrees Celsius (25 degrees Celsius), to prepare a uniformly dispersed cellulose suspension sol...

Embodiment 2

[0067] Adopt application number 201310659172.5, named as a method for preparing graphene by electrochemically swelling graphite. The carbon / oxygen atomic ratio of the graphene sample obtained in Example 3 in the patent is 70%, and the graphene unit reaches 200 microns × 200 microns, 67% in the sample. The number of graphene layers is 2-3 atomic layers. Commercial cellulose fibers (particle size 60 microns) were used as raw materials. Disperse graphene powder in ethanol solvent, under ultrasonic conditions: power 80 watts (80 W), time 10 minutes (10 min), temperature maintained at 30 degrees Celsius (30 degrees Celsius), to prepare a uniformly dispersed graphene suspension, Its concentration is 1.0 mg / mL. Disperse the cellulose powder in ethanol solvent, under ultrasonic conditions: power 80 watts (80 W), time 10 minutes (10 min), temperature maintained at 30 degrees Celsius (30 degrees Celsius), to prepare a uniformly dispersed cellulose suspension, Its concentration is 100 ...

Embodiment 3

[0070] Adopt application number 201310659172.5, named as a method for preparing graphene by electrochemically swelling graphite. The carbon / oxygen atomic ratio of the graphene sample obtained in Example 4 in the patent is 70% (XPS detection), and the graphene unit reaches 200 microns × 200 microns. 80% of the graphene layers in the sample are 2-3 atomic layers. Commercial natural cellulose (particle size 100 microns) was used as raw material. Disperse graphene powder in N,N-dimethylformamide (DMF) solvent, under ultrasonic conditions: power 100 watts (100 W), time 30 minutes (30 min), temperature maintained at 40 degrees Celsius (40°C) , prepared into a uniformly dispersed graphene suspension with a concentration of 7.5 mg / mL. Disperse cellulose (particle size: 100 μm) powder in propanol solvent, under ultrasonic conditions: power 100 watts (100 W), time 30 minutes (30 min), temperature maintained at 40 degrees Celsius (40 ℃), prepared into a uniform Dispersed cellulose susp...

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Abstract

The invention relates to a graphene-based hierarchical porous carbon material. The graphene-based hierarchical porous carbon material comprises, but not limited to, a graphene structure and an activated carbon structure at the same time, wherein the graphene composition is between 3.3% in percentage by mass and 40% in percentage by mass and the carbon material has a specific surface area of 200-1600m<2> / g, a pore size continuously distributed between 0.5nm and 10 microns, an average pore diameter between 2.5nm and 12nm, a pore volume between 0.3-1.1ml / g, a carbon content of 70-97%, a compaction density between 0.8 and 1.3g / ml and the contents in percentage by mass of two elements, namely, carbon and oxygen are 85-98%. The graphene-based hierarchical porous carbon material has the advantages that the cost is low, the process and the device are simple, the porosity is developed and the scale production can be achieved.

Description

technical field [0001] The invention belongs to a graphene-based hierarchical porous carbon material prepared by using graphene and cellulose as raw materials, a preparation method and an application. Background technique [0002] In recent years, the research on graphene-based porous carbon materials has developed rapidly, mainly because this type of material has the unique characteristics of graphene (such as excellent electrical conductivity, thermal conductivity, good mechanical strength, flexibility, chemical stability, etc. ), at the same time, it can overcome the defects of graphene’s easy self-agglomeration and underdeveloped porosity, improve its specific surface area and pore size distribution range, and endow it with new structural features, so that this type of emerging carbon materials can be used in nanoelectronic devices, gas sensors, super Capacitors, energy storage materials, and many fields such as light, electricity, and heat have great potential applicati...

Claims

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Application Information

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IPC IPC(8): C01B31/02C01B31/08H01G11/24H01G11/44H01G11/84
CPCY02E60/13
Inventor 王俊中黄建林吕春祥王俊英王法星
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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