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Method for preparing graphene through electrochemical anode stripping

A graphene and electrochemical technology, applied in the field of electrochemical anode exfoliation to prepare graphene, can solve the problems such as failure to achieve uniform dispersion of graphene, large dispersion concentration of graphene, and the quality of graphene needs to be improved, and achieve good water solubility and Stability, low price, low cost effect

Pending Publication Date: 2021-11-19
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The safety of the electrolyte in this method is better, but the dispersion concentration of the obtained graphene in the organic solvent DMF is relatively large, and the uniform dispersion of graphene in water cannot be realized, and the quality of graphene still needs to be improved.

Method used

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  • Method for preparing graphene through electrochemical anode stripping
  • Method for preparing graphene through electrochemical anode stripping
  • Method for preparing graphene through electrochemical anode stripping

Examples

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Effect test

Embodiment 1

[0046] This embodiment adopts the following steps to prepare graphene by electrochemical exfoliation in turn:

[0047] (1) Weigh 2.4195g of sodium molybdate dihydrate and dissolve it in 100mL of deionized water with stirring to obtain a 0.1M sodium molybdate electrolyte.

[0048] (2) The thickness of the graphite paper used is 0.05cm. Cut out two pieces with a length of 5cm and a width of 2cm. Use anhydrous alcohol to wipe and clean the surface of the graphite paper, and then use it as the anode and cathode respectively, and connect them to the two poles of the DC power supply. Then these two graphite paper electrodes are put into the electrolytic solution of step (1) in parallel, make the distance between two graphite papers be 4cm, and the length that two graphite paper parts are immersed in the electrolytic solution is 4cm, and the width is equal to 4cm. It is 2cm.

[0049] (3) Turn on the DC power supply, the voltage used is +10V, start the electrochemical anode stripping...

Embodiment 2

[0057] This embodiment adopts the following steps to prepare graphene by electrochemical exfoliation in turn:

[0058] (1) Weigh 2.4195g of sodium molybdate dihydrate and dissolve it in 100mL of deionized water with stirring to obtain a 0.1M sodium molybdate electrolyte.

[0059] (2) The thickness of the graphite paper used is 0.05cm. Cut out two pieces with a length of 5cm and a width of 2cm. Use anhydrous alcohol to wipe and clean the surface of the graphite paper, and then use it as the anode and cathode respectively, and connect them to the two poles of the DC power supply. Then these two graphite paper electrodes are put into the electrolytic solution of step (1) in parallel, make the distance between two graphite papers be 4cm, and the length that two graphite paper parts are immersed in the electrolytic solution is 4cm, and the width is equal to 4cm. It is 2cm.

[0060] (3) Turn on the DC power supply, the voltage used is +9V, start the electrochemical anode peeling an...

Embodiment 3

[0063] This embodiment adopts the following steps to prepare graphene by electrochemical exfoliation in turn:

[0064] (1) Weigh 1.2098g of sodium molybdate dihydrate and dissolve it in 100mL of deionized water with stirring to obtain a 0.05M sodium molybdate electrolyte.

[0065] (2) The thickness of the graphite paper used is 0.05cm. Cut out two pieces with a length of 5cm and a width of 2cm. Use anhydrous alcohol to wipe and clean the surface of the graphite paper, and then use it as the anode and cathode respectively, and connect them to the two poles of the DC power supply. Then these two graphite paper electrodes are put into the electrolytic solution of step (1) in parallel, make the distance between two graphite papers be 4cm, and the length that two graphite paper parts are immersed in the electrolytic solution is 4cm, and the width is equal to 4cm. It is 2cm.

[0066] (3) Turn on the DC power supply, the voltage used is +10V, start the electrochemical anode strippin...

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Abstract

The invention provides a method for preparing graphene through electrochemical anode stripping, which comprises the following steps: taking a molybdate aqueous solution as an electrolyte, respectively taking two pieces of graphite paper as an anode and a cathode, connecting the two pieces of graphite paper with two poles of a direct-current power supply, placing the anode and the cathode in the electrolyte, electrifying and carrying out electrochemical anode stripping, and obtaining an electrolytic solution containing a graphene precursor; and purifying the electrolytic solution containing the graphene precursor to obtain the graphene dispersion liquid. The invention provides a novel method for preparing graphene through electrochemical anode stripping, the molybdate aqueous solution is introduced as the electrolyte for electrochemical stripping for the first time, and the method has the advantages of simplicity and convenience in operation, few steps, safety, controllability, environmental friendliness, low cost, high repeatability and the like, and is suitable for large-scale production. Moreover, the number of obtained graphene sheets is not more than 76% and not more than five, and the graphene sheets can be uniformly dispersed in water and have good water solubility and stability.

Description

technical field [0001] The invention relates to the technical field of graphene preparation, in particular to a method for preparing graphene by electrochemical anode stripping. Background technique [0002] Graphene is a two-dimensional carbon material composed of sp 2 The hybridized carbon atoms are arranged in a planar hexagonal pattern. Since its discovery in 2004, graphene has been widely used in transistors, batteries and supercapacitors, biomedicine, biosensors, electrothermal films and catalysis due to its excellent electrical, thermal and mechanical properties. Graphene is a two-dimensional carbon nanomaterial. In the research work on it, how to prepare graphene well has become the primary problem on the road to its application. [0003] After continuous attempts and explorations, the existing graphene preparation methods include mechanical exfoliation, chemical vapor deposition (CVD), epitaxial growth, chemical redox and liquid phase exfoliation. Among them, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/19C01B32/196
CPCC01B32/19C01B32/196C01B2204/04
Inventor 闫立峰吴娟
Owner UNIV OF SCI & TECH OF CHINA
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