Graphene-based nano iron oxide composite material and preparation method thereof

Abstract

The invention discloses a graphene-based nano iron oxide composite material and a preparation method thereof. By the method, iron oxide nano granules with uniform diameter and controllable shape and components can be loaded on graphene. The method comprises the following steps of: uniformly dispersing graphite oxide into deionized water by adopting an ultrasonic method to obtain graphene oxide solution; adding an iron salt precursor into the obtained solution and mixing the precursor and the solution uniformly, adjusting the pH of the solution, and hydrolyzing the iron salt; putting the mixed solution into a reaction kettle and performing hydrothermal reaction; and finally, cleaning and freeze-drying the obtained product to obtain the graphene-based nano iron oxide composite material. The raw materials are common and easily obtained, the cost is low, and the preparation process is simple, safe and environmentally-friendly; the prepared graphene-based nano iron oxide composite material has good structural stability and monodispersity; when the composite material is used as a lithium iron battery electrode material, the charge/discharge capacity can reach over 1,000mAh/g; and the composite material has good multiplying power performance and cycle life.

Description

Technical field [0001] The invention relates to a graphene-based nano-iron oxide composite material, in particular to a graphene-based nano-iron oxide composite material and a preparation method thereof, belonging to the technical field of new functional composite materials. Background technique [0002] Graphene is a new type of two-dimensional carbon nanomaterial, which consists of a single layer of atoms tightly packed into a two-dimensional honeycomb structure. Studies have shown that graphene has a series of excellent properties such as large specific surface area, super conductivity, good chemical stability and wide electrochemical stability window. In recent years, researchers have found that nanocomposite with graphene can significantly improve the hardness, electrical conductivity and electrochemical capacity of the material. Wang H et al reported on JACS 2010 13978-13980 that a two-step liquid phase reaction was used to prepare Mn 3 o 4 -Graphene composite mater...

AI Technical Summary

Problems solved by technology

At present, the modification of iron oxides is mainly to compound them with carbon materials by chemical methods, and use carbon nanotubes, graphite, acetylene black and other carbon sources to coat and modify iron oxides, but the prepared iron oxides composite Materials generally have low capacity

So far, there are few literature reports on the research work related to the preparation of graphene and iron oxides into nanocomposites.

The current method for preparing graphene-based iron oxide nanocomposites mainly has the following disadvantages: the preparation process is relatively cumbersome, and the preparation of graphene through a reducing agent cannot ensure the effective dispersion of graphene, and even agglomeration and heavy accumulation of graphene may occur. Problem; the use of organic solvents as dispersing solvents not only has high raw material costs, but also has certain toxicity and safety hazards. At the same time, due to the complexity of the reaction, it is difficult to ensure the quality and stability of the product

At present, the research on the preparation of graphene-based iron oxide nanocomposites by hydrothermal method has not been reported.

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