Titanium dioxide/graphene nanocomposite material and preparation method and application thereof

A nanocomposite material, titanium dioxide technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of low initial efficiency, low volume energy density, etc., and achieve large specific surface area, high photocatalytic activity, excellent rate performance and cycle performance Effect

Inactive Publication Date: 2014-06-25
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its low initial efficiency (<60%) and low volume energy density, it is the main factor that limits this material directly as the negative electrode material of lithium-ion batteries.

Method used

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  • Titanium dioxide/graphene nanocomposite material and preparation method and application thereof
  • Titanium dioxide/graphene nanocomposite material and preparation method and application thereof
  • Titanium dioxide/graphene nanocomposite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add 5ml of concentrated sulfuric acid (98wt%) to 100ml of graphene aqueous solution with a concentration of 0.5g / L, stir evenly, weigh 5g of titanium sulfate powder into the above solution and stir for 30 minutes, put the solution in a sealed bottle, React at 100°C for 6 hours. The obtained black precipitate is washed three times with clean water and dried at 80° C. to obtain a titanium dioxide and graphene composite material. [TiO] produced by hydrolysis of titanium source in this process 2+ The groups diffuse into the graphene layers through electrostatic attraction, and under certain conditions, heterogeneous nucleation growth, graphene acts as a structure inducer, no template is required to prepare anatase phase mesoporous titanium dioxide nanospheres and graphite Ene composite nanocomposite, mesoporous titanium dioxide spheres with a size of 100 nm are uniformly distributed on the graphene, with an average pore diameter of 4.6 nm and a specific surface area of ​​170...

Embodiment 2

[0044] The difference from Example 1 is that 5ml of concentrated sulfuric acid (98wt%) was added to 100ml of graphene aqueous solution with a concentration of 0.3g / L, and stirred evenly, and 3.5g of titanium sulfate powder was weighed into the above solution and stirred for 30 minutes , Put the solution in a sealed bottle and react at 80°C for 2 hours. Then the obtained black precipitate was centrifuged, washed with deionized water 3 times, and dried in vacuum at 80°C to obtain anatase phase titanium dioxide nanometer composite nanocomposite with graphene, in which the particle size of the composite material is 50nm small titanium dioxide The particles are uniformly dispersed on the surface of the graphene with a pore size distribution of 2-50nm and a specific surface area of ​​110m 2 / g.

[0045] In the titanium dioxide / graphene nanocomposite material of this embodiment, graphene accounts for 14% by weight, and the rest is titanium dioxide.

Embodiment 3

[0047] The difference from Example 1 is that 4.6ml of hydrochloric acid (37wt%) was added to 100ml of graphene aqueous solution with a concentration of 0.3g / L, stirred for 10 minutes, the resulting solution was ultrasonically dispersed for 2 hours, and the tetrabutyl titanate solution was added Add dropwise to the prepared solution and stir for half an hour, and then place the resulting solution in a sealed bottle for reaction at 80°C for 12 hours. Then the obtained black precipitate is centrifuged, washed with deionized water 3 times, and dried in vacuum at 80°C to obtain a nanocomposite of anatase phase mesoporous titanium dioxide nanospheres and graphene. The particle size of the composite is Titanium dioxide particles of 200~300nm are uniformly dispersed on the surface of graphene, pore size distribution is 5~100nm, specific surface area is 69m 2 / g.

[0048] In the titanium dioxide / graphene nanocomposite material of this embodiment, the proportion of graphene is 9 wt%, and t...

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Abstract

The invention relates to a titanium dioxide / graphene nanocomposite material, a preparation method of the nanocomposite material and application of the nanocomposite material in the field of energy source and cleaning environment. The graphene accounts for 1-25wt% and the balance is titanium dioxide. Morphology of the titanium dioxide is a mesoporous structure or a structure with a dominant high energy surface, and titanium dioxide is scattered uniformly on the surface of graphene. According to the invention, by adopting a titanium source and graphene as initial materials, and water or organic solvents as reaction solvents, the nanocomposite material with titanium dioxide with the mesoporous structure or a titanium dioxide nano sheet with the dominant high energy surface compounded with graphene can be obtained through hydrothermal synthesis or a hydrolysis reaction. The invention can be carried out in an aqueous solution system and the crystallinity of the product is high. The composite material can be applied to a cathode material of a power ion battery, has a higher charge-discharge capacity, is excellent in high current charge and discharge, stable in circulating performance, has very good photocatalytic performance and can be used to light degradation of organic pollutants and water photolysis for preparing hydrogen.

Description

Technical field [0001] The invention relates to a titanium dioxide / graphene composite material, a preparation method thereof, and application in the fields of energy and clean environment, in particular to the application of the composite material in the fields of power lithium ion batteries and photocatalysis. Background technique [0002] Environmental pollution and energy crisis have aroused widespread concern in countries all over the world. At present, automobiles consume about 45% of crude oil production and release a large amount of greenhouse gas carbon dioxide; automobile exhaust also contains other polluting gases such as sulfur dioxide and nitrogen oxides. The development of low-emission and low-polluting electric vehicles has become an urgent task recognized by all countries in the world. Many car manufacturers, battery manufacturers, chemical reagent companies and government departments of various countries have invested a lot of money and manpower to accelerate the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 成会明李娜李峰刘岗甄超
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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