Green efficient electrochemical preparation method of high-quality water-soluble graphene

Abstract

A green efficient electrochemical preparation method of high-quality water-soluble graphene comprises the following steps: (a) taking the water solution of aromatic carboxylic acid and metal hydroxideas an electrolyte, a graphite material as an anode material and a platinum sheet as a cathode material, and enabling two electrodes to be connected with a DC (direct current) voltage-stabilized powersupply; (b) switching on supply voltage to perform electrolytic reaction to obtain preliminarily dispersed water-soluble dispersion matter; (c) enabling the dispersion matter obtained in step b to besuccessively subjected to ultrasonic treatment and centrifugal washing to obtain high solid content graphene slurry; and (d) enabling the high solid content graphene slurry obtained in step c to be ultrasonically dispersed in water to obtain stable graphene dispersion liquid. The method has the advantages that the raw materials are easy to prepare and obtain, the technological process is simple,the post-treatment is simple and convenient, the cost is low, and the efficiency and yield are high. The prepared graphene has excellent conductive, heat-conducting and mechanical properties, and meanwhile can be stably dispersed in water for 6 months or more under the condition of not adding a dispersing agent.

Description

technical field [0001] The invention relates to the technical field of graphene material preparation, in particular to a green and efficient electrochemical preparation method of high-quality water-soluble graphene. Background technique [0002] Graphene is composed of single layer sp 2 Honeycomb-like hexagonal planar two-dimensional crystals formed by the arrangement of hybridized carbon atoms. On the two-dimensional plane, sp 2 The hybridized carbon atoms are connected to the adjacent three carbon atoms through strong σ bonds, and the remaining P electron orbitals are perpendicular to the graphene plane, forming large π bonds with the surrounding atoms, so that graphene has good electrical and thermal conductivity and mechanical properties. performance. Graphene has always attracted great interest in scientific research and industry because of its excellent special properties. However, graphene with a complete structure is a two-dimensional crystal composed of six-member...

AI Technical Summary

Problems solved by technology

However, graphene prepared by existing electrochemical techniques is basically dissolved in organic solvents and cannot be dissolved in water.

The main reason why electrochemically prepared graphene is difficult to dissolve in water is that under the action of an electric field, although graphite is at the anode, there is an electric field-assisted oxidation process, but due to the rapid peeling of the electric field, once it is peeled off the surface of the electrode to form an independent graphite ene, it will not be oxidized by the electric field, and the oxidation benefit of the electrolyte itself is extremely weak

Images