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Method for preparing graphene dispersion liquid through electrochemically assisted ultrasonic method

A graphene dispersion, ultrasonic method, applied in chemical instruments and methods, graphene, inorganic chemistry and other directions, can solve the problems of graphene sheet thickness, low graphene yield, etc., and achieve low cost and good dispersibility. , Environmentally friendly effect

Inactive Publication Date: 2018-09-07
SHANGHAI HUAMING HI TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the graphene sheets prepared by existing electrochemical methods are relatively thick, and the yield of graphene is relatively low, which cannot well meet the needs of practical applications.

Method used

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  • Method for preparing graphene dispersion liquid through electrochemically assisted ultrasonic method
  • Method for preparing graphene dispersion liquid through electrochemically assisted ultrasonic method
  • Method for preparing graphene dispersion liquid through electrochemically assisted ultrasonic method

Examples

Experimental program
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Effect test

Embodiment example 1

[0030] With 0.5mol / L Na 2 SO 4 100ml of aqueous solution is used as the electrolyte, a graphite rod with a diameter of 6mm and a length of 6cm is used as the anode, and the cathode and the anode are graphite rods, and the two electrodes are placed vertically with a parallel distance of 2cm. The initial temperature of the electrolyte is 20°C, and the anode graphite rod is electrolytically stripped at a constant voltage of 14V until the stripping is completed. After the electrolytic exfoliation is filtered and washed, it is dried and dehydrated in a constant temperature drying oven. In the Erlenmeyer flask, 30ml of N-methylpyrrolidone was added to the dried sample for ultrasonic treatment, the concentration of the sample was controlled to be 31g / L, the ultrasonic frequency was 40KHz, and the ultrasonic time was 8h. The liquid was centrifuged at 2000 rpm for 30 min, and the upper layer was collected to obtain a graphene dispersion. It is calculated that the concentration of th...

Embodiment example 2

[0032] With 0.3mol / L Na 2 SO 4 100ml of aqueous solution is used as the electrolyte, a graphite rod with a diameter of 6mm and a length of 6cm is used as the anode, the anode is a graphite rod, and the cathode is a platinum wire. The two electrodes are placed vertically with a parallel distance of 2cm. The starting temperature of the electrolyte is 25°C, and the anode graphite rod is electrolytically stripped at a constant voltage of 12V until the stripping is completed. After the electrolytic exfoliation is drained and washed with water, it is dried and dehydrated in a constant temperature drying oven. The dried solid is used as the precursor for preparing the graphene dispersion, and 30ml N, N-dimethylformamide is added in the conical flask. The initial concentration of the graphite intercalation compound is 31g / L, and the ultrasonic power is 40KHz. Time 8h. The liquid was centrifuged at 2000 rpm for 30 min, and the upper layer was collected to obtain a graphene dispersio...

Embodiment example 3

[0034] With 0.5mol / L (NH 4 ) 2 HPO 4 100ml of aqueous solution is used as the electrolyte, a graphite rod with a diameter of 6mm and a length of 6cm is used as the anode, and the cathode and the anode are graphite rods, and the two electrodes are placed vertically with a parallel distance of 2cm. The initial temperature of the electrolyte is 28°C, and the anode graphite rod is electrolytically stripped at a constant voltage of 14V until the stripping is completed. After the electrolytic exfoliation is drained and washed with water, it is dried and dehydrated in a constant temperature drying oven. The solid after drying is used as the precursor of preparing graphene dispersion liquid, in Erlenmeyer flask, add 15ml N, N-dimethylformamide and 15ml tetrahydrofuran, the initial concentration of graphite intercalation compound is 40g / L, ultrasonic frequency is 50KHz, ultrasonic time 9h. The liquid was centrifuged at 2000 rpm for 30 min, and the upper layer was collected to obtai...

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Abstract

The invention discloses a method for preparing a high-concentration stable graphene dispersion liquid through an electrochemically assisted ultrasonic method, wherein the method has advantages of costsaving, improved graphene yield and environmental pollution reducing. According to the present invention, the prepared graphene dispersion liquid has the concentration of up to 11.47 g / L and the average graphene size of 0.85 [mu]m, the number of the layers is less, the single layer rate is 18%, and the less-layer rate (1-3 layers) rate is 76%; the preparation method comprises: 1, preparing a certain concentration of an inorganic salt / inorganic acid aqueous solution as an electrolytic solution, carrying out electrolysis stripping on a graphite rod anode under a constant voltage, carrying out suction filtration on the electrolysis stripping product, washing, and drying, and 2, adding the solid material into a solvent, carrying out ultrasonic treatment, carrying out centrifugation, and collecting the upper layer liquid to obtain the graphene dispersion liquid; and the synthesis method has characteristics of simpleness, easy control, environment protection and low cost, and is suitable for industrial production.

Description

technical field [0001] The invention relates to the field of graphene preparation, in particular to a method for preparing a graphene dispersion. Background technique [0002] Graphene is a new type of two-dimensional carbon nanomaterial with ultra-high electrical and thermal conductivity, huge theoretical specific surface area, extremely high Young's modulus and tensile strength. These excellent properties of graphene make it have great potential application prospects in the fields of optoelectronic devices, chemical power sources (such as solar cells, lithium-ion batteries), gas sensors, catalysts and drug carriers, antistatic and heat dissipation materials. Due to the large specific surface area of ​​graphene, aggregation between sheets is easy to occur, which affects the performance of graphene. In order to prevent the occurrence of agglomeration, graphene is usually dispersed in an organic solvent or aqueous surfactant solution, and a high-concentration graphene disper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/19
CPCC01B2204/04C01B2204/28C01B2204/32C01P2002/01C01P2004/04
Inventor 杨景辉杨青汪中进
Owner SHANGHAI HUAMING HI TECH GRP