Method for preparing graphene energy storing material through electrochemical cathodic disbonding

A technology of cathodic stripping and energy storage materials, which is applied in the field of new materials, can solve the problems of high cost, reduce the conductivity of graphene materials, and oxidize the surface of graphene, and achieve the effects of low cost, easy industrialization and application, and easy control of the process

Active Publication Date: 2013-02-13
CENT SOUTH UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although anodic oxidation can obtain graphene quickly, the anodic process easily causes the surface of graphene to be partially oxidized, making it contain some oxygen-containing functional groups and have certain structural defects, which greatly reduces the conductivity of graphene materials and limits its further application
Recently, Professor Loh et al. [J.Am.Chem.Soc.2011(133)8888] successfully synthesized multilayer graphene sheets by lithium ion intercalation and high-power u

Method used

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  • Method for preparing graphene energy storing material through electrochemical cathodic disbonding
  • Method for preparing graphene energy storing material through electrochemical cathodic disbonding
  • Method for preparing graphene energy storing material through electrochemical cathodic disbonding

Examples

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Example Embodiment

[0027] Example 1: Cathode in acetonitrile (AN) solution-10V exfoliated graphite rod to prepare graphene

[0028] With the Pt sheet as the anode and the high-purity graphite rod as the cathode, in a 0.5mol / L tetrabutylammonium hexafluorophosphate solution in acetonitrile, a constant voltage of –10V, a strong direct current polarized the cathode for 2h, and then the product obtained from the cathode was used without Washed with water and ethanol for 5 times, dispersed by ultrasonic (99W, 30kHz, 5h), centrifuged at a low speed of 1500 rpm, and then centrifuged the obtained supernatant at a high speed of 13,300 rpm, and finally the solid product obtained was vacuum dried at 40°C to obtain the product . TEM showed that the graphite was exfoliated, forming a graphene material. The dried product is ultrasonically dispersed in N,N-dimethylformamide (DMF) to obtain a uniformly dispersed sol.

Example Embodiment

[0029] Example 2: Cathode in N,N-dimethylformamide (DMF) solution – 10V exfoliated graphite rod to prepare graphene

[0030] With Pt sheet as anode and high-purity graphite rod as cathode, in a DMF solution of 0.5mol / L tetrabutylammonium hexafluorophosphate, a constant voltage of -10V strong cathode polarization for 2h, and then the product obtained from the cathode is used absolute ethanol Wash 5 times, ultrasonic (95W, 30kHz, 5h) dispersion, low-speed 1500rpm centrifugation, then centrifuge the obtained supernatant at high-speed 13,300rpm, and finally the solid product obtained by vacuum drying at 40°C to obtain the product. TEM showed that the graphite was exfoliated, forming a graphene material.

Example Embodiment

[0031] Example 3: Preparation of graphene from cathode -10V exfoliated graphite rod in propylene carbonate (PC) solution

[0032] Using Pt sheet as anode and high-purity graphite rod as cathode, in a PC solution of 0.5mol / L tetrabutylammonium hexafluorophosphate, a constant voltage of -30V strong cathode polarization for 0.5h, and then the product obtained from the cathode is anhydrous Washed with ethanol for 5 times, dispersed by ultrasonic (90W, 30kHz, 3h), centrifuged at a low speed of 1500 rpm, then centrifuged the obtained supernatant at a high speed of 13,300 rpm, and finally the solid product obtained was vacuum dried at 40°C to obtain the product. TEM showed that the graphite was exfoliated, forming a graphene material.

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Abstract

The invention relates to the field of new materials, and in particular to a preparation method of graphene, which is the method for preparing a graphene energy storing material through electrochemical cathodic disbanding. The method comprises steps as follows: getting noble electrode as anode, high-purity graphite as cathode, a quaternary ammonium salt organic solvent as electrolyte, and voltage adjustable direct current power as the power supply; carrying out high cathodic disbanding under a constant voltage of -5 to -100V; inserting the solvated quaternary ammonium salt into laminated graphite under an effect of a high cathode voltage so as to generate expansion on a surface of the graphite electrode in a single layer or a plurality of layers; and decomposing the solvent to obtain gas under an electric potential effect of the high cathode, so as to further strip the graphite to obtain the graphene. The method is carried out under a direct current stabilized power supply without other special equipment; the method for preparing the graphene is simple, convenient and easy to carry, a process is easy to control, cost is low, no pollution is generated, and convenience is provided for industrial popularization and application; and prepared graphene can be widely applied to fields such as an energy storage field, an energy conversion field, an electronic device field and a biosensing field.

Description

technical field [0001] The invention relates to the field of new materials, in particular to a method for preparing graphene energy storage materials by electrochemical cathode stripping. Background technique [0002] Graphene is a single layer of carbon atoms through sp 2 Graphene is a new two-dimensional honeycomb carbon-based nanomaterial with a thickness of only 0.335nm that is hybridized and closely packed. Since its discovery in 2004, graphene has attracted widespread attention from the scientific and industrial circles. Graphene's unique two-dimensional structure makes it have excellent electrical properties, excellent chemical stability and thermodynamic stability, as well as physical and mechanical properties, and has been widely studied in sensor devices, optoelectronics, energy conversion and storage materials and apply. Especially graphene's high conductivity (64mS / cm) and high theoretical specific surface (2675m 2 / g), graphene has been considered as an ideal...

Claims

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Application Information

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IPC IPC(8): C01B31/04H01G11/86C01B32/19
Inventor 纪效波杨应昌宋维鑫朱裔荣陈启元李叙
Owner CENT SOUTH UNIV
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