Electrochemical high-efficiency exfoliation method for preparing high-quality graphene
A graphene, high-quality technology, applied in the field of electrochemical high-efficiency exfoliation to prepare high-quality graphene, can solve the problems of high resistance, lower production costs, and damage to the honeycomb lattice structure, and achieve high conductivity, good effect, The effect of small resistance value
Active Publication Date: 2016-02-03
杭州金马新能源科技有限公司
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Problems solved by technology
However, graphene prepared by mechanical exfoliation and epitaxial growth has high quality, but it is not suitable for large-scale production
Recent research on chemical vapor deposition using catalytic metal substrates has made great progress to show that large-area graphene can increase the capacity and expand its application in highly transparent and flexible conductive films, but the preparation is expensive and must Efforts to reduce production costs
The preparation of graphene by chemical or thermal reduction oxidation chemical exfoliation method has attracted people's attention due to the potential low cost and the advantages of liquid phase processing and manufacturing. However, the honeycomb lattice structure of graphene is severely damaged during the oxidation process. The obtained film resistance is from 1K to 70KΩ / □ (<80% light transmittance), the resistance value is too high, much higher than the requirements of ITO
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[0030] Embodiment: the electrochemical high-efficiency exfoliation of this example prepares the method for high-quality graphene, and its steps are:
[0031] 1. In this embodiment, natural flake graphite (NGF) (average size between 5 and 20 mm) is used as the positive electrode and the raw material for preparing graphene. The end face of the strip graphite is first drilled with Φ1 mm, and the tungsten wire is inserted into the hole after cleaning. Silver welding is used to weld the tungsten wire firmly, and it is integrated with the strip graphite, such as figure 1 , and then inserted into the ion solution as the anode, only the graphite is impregnated into the solution, the platinum wire is used as the ground electrode (negative electrode), placed parallel to the graphite sheet, and 50mm away from the strip graphite, take (2.4-4.8 g) of H 2 SO 4 (98%) into 100mL of deionized water and 11mL of 30% KOH solution as the electrolyte, the pH value is 10-12 and added into the react...
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Abstract
The invention relates to a preparation method for graphene, especially to a method for preparing high-quality graphene through electrochemical high-efficiency exfoliation. The method mainly overcomes the technical problems that the honeycomb lattice structure of graphene is severely destroyed in the process of oxidation, an obtained membrane resistance is 1 K to 70 K omega / square (wherein light transmittance is less than 80%), the resistance is too high and much higher than requirements of ITO, etc. The method comprises the following steps: with graphite as a positive electrode and a platinum filament as a negative electrode, repeatedly applying high offset voltage and negative offset voltage on the graphite electrode, which enables graphite to be rapidly disassociated and decomposed into double-layer graphene floating on the surface of an electrolyte; collecting graphene and then filtering and drying graphene; dispersing obtained powder of a graphene film in a DMF solution; and carrying out water-bath ultrasonic treatment and centrifugation so as to obtain desired 1.5-nm-grade graphene flakes.
Description
technical field [0001] The invention relates to a method for preparing graphene, in particular to a method for preparing high-quality graphene by electrochemical efficient exfoliation. Background technique [0002] Graphene is an atomic graphite due to its two-dimensional structure and unique physical properties, such as high intrinsic electron mobility (~20000cm 2 / / v 3s) 2 , excellent mechanical strength, flexible elasticity, and good electrical conductivity, have attracted extensive attention. Existing graphene preparation methods include mechanical exfoliation, epitaxial growth, vapor deposition, and redox methods. However, graphene prepared by mechanical exfoliation and epitaxial growth has high quality, but it is not suitable for large-scale production. Recent research using chemical vapor deposition on catalytic metal substrates has made great progress to show that large-area graphene can increase capacity and expand its application in highly transparent and flexib...
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IPC IPC(8): C01B31/04C01B32/19
Inventor 石小英王叶滔王伯良沈乐王汉杰
Owner 杭州金马新能源科技有限公司