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Graphene-loaded activated carbon composite material and preparation method thereof

A composite material, activated carbon technology, applied in graphene, chemical instruments and methods, hybrid/electric double layer capacitor manufacturing, etc. Increased conductivity, good repeatability

Active Publication Date: 2017-08-18
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Invention patent application CN104576086A discloses the application of a graphene / lignin-based activated carbon. In the material preparation method, the reducing gas mixed with 1%~20% inert gas is used to reduce 1~5 h To obtain graphene / lignin-based activated carbon composite materials, this method is prepared under high temperature conditions and uses a reducing gas, which is costly, time-consuming, and has potential safety hazards

Method used

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  • Graphene-loaded activated carbon composite material and preparation method thereof
  • Graphene-loaded activated carbon composite material and preparation method thereof
  • Graphene-loaded activated carbon composite material and preparation method thereof

Examples

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Embodiment 1

[0037] The preparation method of the activated carbon composite material loaded with graphene comprises the following steps: a) Grinding the activated carbon to 1000 mesh, washing and drying the activated carbon with deionized water, adding it to 1 M hydrochloric acid solution for soaking for 24 h, and then washing until the pH is low change, pH = 6.5, dried in an oven at 105 °C for 24 h; b) according to the mass ratio of activated carbon to graphene oxide of 10:1, ultrasonically dispersed in 100 mL ultrapure water for 4 h, the concentration was 0.3 mg / mL, then add 0.3 g of activated carbon to the solution, and stir for 12 h; c) Slowly add 100 mL of ethylenediamine solution with a concentration of 9 mg / mL, so that the mass of ethylenediamine is 30 times that of graphene oxide, React in a water bath at 80°C for 8 h, and pass N 2 ; d): The product of step c) was dialyzed for 24 hours until the conductivity of the dialysate dropped to the required value and dropped to 18 us / cm, ...

Embodiment 2

[0043] The preparation method of the activated carbon composite material loaded with graphene comprises the following steps: a) Grinding the activated carbon to 1000 mesh, washing and drying the activated carbon with deionized water, adding it to 1 M hydrochloric acid solution for soaking for 24 h, and then washing until the pH is low Change, pH = 6.5, dry in an oven at 105°C for 24 h; b) According to the mass ratio of activated carbon and graphene oxide at 5:1, ultrasonically disperse in 100 mL ultrapure water for 4 h, and the prepared concentration is 0.6 mg / mL, then add 0.3 g of activated carbon to the solution, and stir for 12 h; c) Slowly add 100 mL of ethylenediamine solution with a concentration of 18 mg / mL, so that the mass of ethylenediamine is 30 times that of graphene oxide , reacted in a water bath at 80°C for 8 h, and passed N 2 ; d): The product of step c) was dialyzed for 24 h until the conductivity of the dialysate dropped to the required value, then filtered ...

Embodiment 3

[0049] The application of the activated carbon composite material of loaded graphene comprises the following steps: the composite material prepared in embodiment one and two, add the sodium carboxymethyl cellulose of composite material quality 0.5%, then add a small amount of deionized water and mix , pressed into tablets with a tablet press, and dried at a constant temperature in a desiccator; the conductivity of the compressed tablets was tested using the four-probe method.

[0050] The results show that the resistivity of the sample prepared in Example 1 is 48.09 Ω cm, and the conductivity is 2.08 S m -1 ; The resistivity of the sample prepared in embodiment two is 20.55 Ω cm, and the conductivity is 4.87 S m -1 . Compared with the conductivity of coconut shell activated carbon itself (0.05 S·m -1 ), the resistivity of the sample in Example 1 increased by about 42 times, and the conductivity of the sample in Example 2 increased by nearly 100 times. It shows that the elec...

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Abstract

The invention relates to a graphene-loaded activated carbon composite material and a preparation method thereof. The preparation process of the material comprises the following steps of crushing activated carbon to be 1,000 meshes, carrying out acidification treatment on the activated carbon, and then cleanly washing and drying the activated carbon; carrying out ultrasonic treatment on a graphene oxide solution, so as to form a homogeneous solution; afterwards, immerging the acidified activated carbon into the solution, sufficiently agitating an obtained first mixture, then adding an ethylenediamine solution into the obtained first mixture, making an obtained second mixture react at a temperature of 80 DEG C in a water bath, and after a reaction is terminated, subjecting graphene loaded activated carbon to dialysis treatment; finally, washing and filtering the graphene-loaded activated carbon, and subjecting the graphene-loaded activated carbon to vacuum drying, so that the material is made. The method provided by the invention is simple in technique, and is simple and convenient to operate; by utilizing the excellent electric conduction performance of graphene, the graphene-loaded activated carbon composite material which is higher in conductivity and lower in cost is prepared; not only is the agglomeration phenomenon, which is generated due to surface electrostatic action, of the graphene overcome, but also the self electric conduction performance of the activated carbon is promoted; the conductivity of the composite material is increased by approximately 100 times.

Description

technical field [0001] The invention relates to the field of activated carbon-based composite materials, in particular to an activated carbon composite material loaded with graphene and a preparation method thereof. Background technique [0002] The rapid development of electronic information technology has prompted the reform of power supply technology. The standard design capabilities of batteries have been unable to meet the power density requirements of energy storage devices in many application fields. Generally, higher energy density or power density per unit volume or unit weight is desired. Supercapacitor is an energy storage device between ordinary capacitors and batteries. Its superior performance makes it have unique application advantages in many occasions, and the conductivity of electrode materials restricts electrochemical capacitors from obtaining high power density. one of the key issues. [0003] Commonly used electrode materials such as metal oxides and...

Claims

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Application Information

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IPC IPC(8): C01B32/354C01B32/184H01G11/32H01G11/38H01G11/86
CPCY02E60/13H01G11/32C01P2002/72C01P2002/82C01P2004/03C01P2006/40H01G11/38H01G11/86
Inventor 汪印刘学蛟
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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