Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing graphene by bipolar electrochemical stripping of organic acid ammonium molten salt

A technology of ammonium organic acid and graphene, which is applied in the field of nanomaterials, can solve the problems of no intercalation and limited stripping efficiency, and achieve the effects of low price, easy industrialization and environmental friendliness

Pending Publication Date: 2021-10-08
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the exfoliation efficiency is limited because large cations or solvated ions can easily exfoliate graphite into thick sheets, thus, most of the sheets leave graphite cathode without sufficient intercalation

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing graphene by bipolar electrochemical stripping of organic acid ammonium molten salt
  • Method for preparing graphene by bipolar electrochemical stripping of organic acid ammonium molten salt
  • Method for preparing graphene by bipolar electrochemical stripping of organic acid ammonium molten salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) Weigh a certain mass of ammonium formate, heat it to 120°C to melt it and magnetically stir it evenly to obtain its liquid molten salt;

[0054] (2) Take two graphite rod electrodes as the negative and positive poles respectively, use the above-mentioned ammonium formate molten salt as the electrolyte, and insert the graphite rod electrodes into the electrolyte, keeping the distance between the graphite electrodes at 1 cm, insert them into the electrolyte The depth is 1cm;

[0055] (3) connect the cathode and anode of its graphite with its DC power supply, apply a voltage of 1V to electrolyze for 1 minute, collect the expanded graphite in the electrolyte, wash with distilled water, and wash with ethanol;

[0056] (4) The above-mentioned expanded graphite after cleaning is dispersed in N-methylpyrrolidone (NMP), and then ultrasonic cleaner is used for 5 minutes, the dispersion is suction-filtered, washed with ethanol, and dried under normal pressure to obtain graphen...

Embodiment 2

[0058] (1) Ammonium formate and ammonium acetate are weighed according to the mass fraction of 5% and 95% respectively, heated to 130° C. to melt and magnetically stirred to obtain its liquid molten salt;

[0059] (2) Take two graphite foil electrodes as the cathode and anode respectively, use the above-mentioned ammonium formate and ammonium acetate molten salt as the electrolyte, and insert the graphite foil electrodes into the electrolyte, keeping the distance between the graphite electrodes at 2cm, and inserting them into The depth in the electrolyte is 2cm;

[0060] (3) connect the cathode and anode of its graphite with its DC power supply, and apply a voltage of 3V to electrolyze for 5 minutes, collect the expanded graphite in the electrolyte, wash with distilled water, and wash with ethanol;

[0061] (4) Disperse the above-mentioned expanded graphite after cleaning in N-methylpyrrolidone (NMP), then use an ultrasonic breaker to ultrasonicate for 60 minutes, suction filt...

Embodiment 3

[0063] (1) Weigh ammonium formate, ammonium acetate and ammonium propionate according to the mass fractions of 5%, 35% and 60% respectively, heat to 135°C to melt and magnetically stir to obtain its liquid molten salt;

[0064] (2) Take two highly oriented pyrolysis graphite electrodes as the cathode and anode respectively, use the above-mentioned molten salts of ammonium formate, ammonium acetate and ammonium propionate as the electrolyte, and insert the highly oriented pyrolysis graphite electrodes into the electrolyte to keep the graphite The distance between the electrodes is kept at 3cm, and the depth inserted into the electrolyte is 2cm;

[0065] (3) connect the cathode and anode of its graphite with its DC power supply, apply a voltage of 8V and electrolyze for 25 minutes, collect the expanded graphite in the electrolyte, wash with distilled water, and clean with ethanol;

[0066] (4) The above-mentioned expanded graphite after cleaning is dispersed in N-methylpyrrolido...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Sizeaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for preparing graphene by bipolar electrochemical stripping of organic acid ammonium molten salt. The method comprises the steps that an electrochemical reaction system is jointly constructed by using liquid molten salt as electrolyte and graphite electrodes as a cathode and an anode respectively, wherein the electrolyte comprises organic acid ammonium liquid molten salt; and the electrochemical reaction system is electrified for electrolysis, 1-30 V voltage is applied for electrolysis for 1-100 min to obtain expanded graphite, and then ultrasonic treatment is conducted to obtain graphene. The organic acid ammonium liquid molten salt comprises ammonium formate, ammonium acetate, ammonium propionate and the like. According to the method disclosed by the invention, the cathode and the anode can be stripped simultaneously, and the organic acid ammonium can be inserted into the interlayer of the graphite after forming the fused salt and is decomposed into gas under the driving of voltage, so that the interlayer of the graphite expands to generate graphene; and the operation is simple, and the required organic acid ammonium fused salt is environment-friendly, low in price, good in reproducibility and convenient for industrial popularization.

Description

technical field [0001] The invention relates to a method for preparing graphene, in particular to a method for preparing graphene by bipolar electrochemical stripping of organic acid ammonium molten salt, and belongs to the technical field of nanometer materials. Background technique [0002] Graphene is composed of a single layer of carbon atoms and has excellent physical and chemical properties. And it has potential applications in optoelectronic devices, catalysis, biosensing, transparent conductive films, and energy storage. Developing scalable and low-cost production of high-quality graphene is an urgent requirement to realize its commercialization and large-scale applications. However, traditional methods are not competitive in terms of yield, scale, cost-effectiveness, and environmental acceptance. For example, the chemical reduction of graphite oxide requires extensive use of strong acids, strong oxidants, and toxic substances to prepare monolayer and few-layer gra...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C01B32/19
CPCC01B32/19C01B2204/32
Inventor 张学同汪伟
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI