Graphene composite material and preparation method thereof

Abstract

The invention belongs to the field of materials and discloses a graphene composite material. The graphene composite material comprises a zinc oxide layer, a first graphene layer, a titanium dioxide and zinc oxide mixed layer and a second graphene layer, wherein zinc oxide particles in the zinc oxide layer are evenly distributed on the surface of the titanium dioxide and zinc oxide mixed layer and are 20-50 nm thick, the particle size of the zinc oxide particles ranges from 10 to 20 nm, and the zinc oxide particles with the particle size below 15 nm account for 80wt% or more. The graphene composite material has the benefits as follows: zinc oxide and titanium dioxide are adopted as a three-dimensional structure, graphene is located in the three-dimensional structure, the graphene layers can be effectively opened, the specific surface area of graphene is increased, the high conductive characteristic of graphene can be fully played, and the material can be widely applied to fields of supercapacitors and photocatalysis.

Description

technical field [0001] The invention relates to the field of materials, in particular to a graphene composite material and a preparation method thereof. Background technique [0002] Before the discovery of graphene, it was believed that single atomic layer materials were thermodynamically unstable. In fact, graphene, a single atomic layer material, is not only stable but also has excellent mechanical and electrical properties (carrier mobility at room temperature reaches 2.5×105cm 2 ·V -1 ·S -1 , thermal conductivity up to 5300W·m -1 ·K -1 , the theoretical specific surface area is as high as 2630m 2 g -1 , the resistivity is only about 10 -8 Ω·m), large specific surface area and high electrical conductivity make graphene a material with great application prospects. [0003] At present, researchers at home and abroad have done a lot of research on the compounding and modification of graphene materials. Chinese patent application number: 201210453995 uses graphene oxi...

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Problems solved by technology

[0005] In order to overcome the problems of small specific surface area, insufficient electrical conductivity and photocatalytic performance in the prior art, the invention provides a graphene composite material, comprising a zinc oxide layer, a first graphene layer, a titanium dioxide and zinc oxide mixed layer and The second graphene layer, the zinc oxide particles in the zinc oxide layer are evenly distributed on the surface of the titanium dioxide and zinc oxide mixed layer, the thickness is 20-50nm, and the particle size of the zinc oxide particles is between 10-20nm, wherein the particle size is between 10-20nm Zinc oxide particles below 15nm account for more than 80wt%

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