Method for repairing graphite structure in reduced graphene oxide and application of nitrogen-doped reduced graphene oxide

Abstract

The invention belongs to the field of preparation of graphene oxide, and particularly relates to a method for repairing a graphite structure in reduced graphene oxide, wherein the method comprises thefollowing steps: (1) oxidizing graphite to prepare graphene oxide; and (2) mixing the graphene oxide prepared in the step (1) with pyridine to prepare a mixed solution, adding a predetermined amountof nickel ions into a mixed solution, carrying out a hydrothermal reaction on the mixed solution, carrying out freeze drying on the product after the reaction is completed, calcining at a predetermined temperature for a predetermined time, and washing and drying the calcined solid to obtain the target product. Compared with a vapor deposition method, the implementation conditions of the technologyfor repairing the graphite structure in the reduced graphene oxide and introducing a nitrogen-containing functional group do not need specific complex equipment and harsh conditions; the preparationmethod is simple to operate, low in cost, mild in condition and beneficial to large-scale production; and meanwhile, the prepared nitrogen-doped reduced graphene oxide has excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the field of preparation of graphene oxide, and in particular relates to a method for repairing graphite structure in reduced graphene oxide and the application of nitrogen-doped reduced graphene oxide. Background technique [0002] Due to its excellent physical and chemical properties, graphene is widely used in the fields of electronic devices, optoelectronic devices, energy storage, biomaterials and probes; and the methods of preparing graphene mainly include chemical vapor deposition, mechanical or liquid phase exfoliation , reduced graphene oxide method, etc.; compared with chemical vapor deposition and mechanical or liquid phase exfoliation, graphene prepared by reduced graphene oxide method has advantages such as simple operation, no need for overly complicated instruments and equipment, and mild conditions. Good application prospects; but because a large number of oxygen-containing functional groups and many defects are...

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Problems solved by technology

[0002] Due to its excellent physical and chemical properties, graphene is widely used in the fields of electronic devices, optoelectronic devices, energy storage, biomaterials and probes; and the methods of preparing graphene mainly include chemical vapor deposition, mechanical or liquid phase exfoliation , reduced graphene oxide method, etc.; compared with chemical vapor deposition and mechanical or liquid phase exfoliation, graphene prepared by reduced graphene oxide method has advantages such as simple operation, no need for overly complicated instruments and equipment, and mild conditions. Good application prospects; but because a large number of oxygen-containing functional groups and many defects are introduced, the physical and chemical properties of the prepared graphene are affected; for example: the thermal conductivity, electron mobility, and mechanical properties of reduced graphene oxide are far away lower than that of graphene prepared by mechanical exfoliation; in recent years, reduced graphene oxide has been widely used as an electrode material for supercapacitors, but its specific capacitance is far lower than its theoretical specific capacitance; by introducing nitrogen atoms into reduced graphene oxide , can greatly improve the specific capacitance of reduced graphene oxide; but the amorphous carbon formed by the nitrogen-containing substance introduced will destroy the integrity of the graphite structure; in the existing technology, through different small molecules (such as pyridine, Benzene, etc.) as precursors on base catalysts (copper, platinum, palladium, etc.) conditions; therefore, it is still a challenge to introduce nitrogen atoms into graphene at lower temperatures and form graphitic nitrogen-doped carbon

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