Method for controlling morphology of graphene coated nano-titanium dioxide, product prepared by the method and application of the method

A nano-titanium dioxide, graphene coating technology, applied in the direction of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the problems of reducing the performance of lithium storage and sodium storage, complicated experimental steps, and limiting long-term development, etc. Achieve the effect of high capacity, low cost and high application value

Active Publication Date: 2016-12-07
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few reports on carbon quantum dots as their structural modulators
[0004] Titanium dioxide is a semiconductor metal oxide with a conductivity of 10 -12 S cm -1 , greatly reducing its lithium storage and sodium storage performance, limiting its long-term development in the energy field
In addition, graphene / titanium dioxide composites prepared by traditional methods are prepared by adding graphene oxide as a raw material, which has disadvantages such as high reaction cost, complicated and cumbersome experimental steps, and long experimental cycle.

Method used

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  • Method for controlling morphology of graphene coated nano-titanium dioxide, product prepared by the method and application of the method
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  • Method for controlling morphology of graphene coated nano-titanium dioxide, product prepared by the method and application of the method

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Experimental program
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Effect test

Embodiment 1

[0042]Add 0.58g of cetyltrimethylammonium bromide (CTAB) into a mixed solvent composed of 60ml of n-hexane and 10ml of n-pentanol, seal it with a parafilm, and dissolve it with magnetic stirring in a water bath at 60°C. After the uniform colorless solution, add 20 mg of carbon quantum dots, stir for 2-5 minutes to form a uniform bright yellow solution, and then drop into 1.0 ml of titanium chloride solution (15% titanium trichloride dilute hydrochloric acid solution) to form a brownish purple uniform solution , continue to stir for 2-5min, transfer all the solution into the reaction kettle, and carry out solvothermal reaction, the reaction temperature is 200°C, the reaction time is 6h, and naturally cool to room temperature after the reaction. A yellow homogeneous solution was obtained, and the excess organic solvent was evaporated with a rotary evaporator, and then the product was dried in a vacuum oven at 100° C. for 24 hours to obtain a yellow paste-like substance. The yell...

Embodiment 2

[0044] Embodiment 2 (without adding carbon quantum dots)

[0045] Add 0.58g of cetyltrimethylammonium bromide (CTAB) into a mixed solvent composed of 60ml of n-hexane and 10ml of n-pentanol, seal it with a parafilm, and dissolve it with magnetic stirring in a water bath at 60°C. After the uniform colorless solution, drop 1.0ml of titanium chloride solution (15% titanium trichloride dilute hydrochloric acid solution) to form a uniform solution of brownish purple, continue to stir for 2-5min, transfer all the solutions to the reaction kettle, and carry out the solvent Thermal reaction, the reaction temperature is 200°C, the reaction time is 6h, and naturally cooled to room temperature after the reaction. A white homogeneous solution was obtained, and the excess organic solvent was evaporated with a rotary evaporator, and then the product was dried in a vacuum oven at 100° C. for 24 hours to obtain a white paste-like substance. The white paste substance was calcined at 800°C for...

Embodiment 3

[0046] Embodiment 3 (adding a small amount of carbon quantum dots)

[0047] Add 0.58g of cetyltrimethylammonium bromide (CTAB) into a mixed solvent composed of 60ml of n-hexane and 10ml of n-pentanol, seal it with a parafilm, and dissolve it with magnetic stirring in a water bath at 60°C. After the uniform colorless solution, add 10 mg of carbon quantum dots and stir for 2-5 minutes to form a uniform bright yellow solution, then drop in 1.0 ml of titanium chloride solution (15% titanium trichloride dilute hydrochloric acid solution) to form a brownish purple uniform solution , continue to stir for 2-5min, transfer all the solution into the reaction kettle, and carry out solvothermal reaction, the reaction temperature is 200°C, the reaction time is 6h, and naturally cool to room temperature after the reaction. A yellow homogeneous solution was obtained, and the excess organic solvent was evaporated with a rotary evaporator, and then the product was dried in a vacuum oven at 100...

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Abstract

The invention relates to a method for controlling morphology of graphene coated nano-titanium dioxide, a product prepared by the method and an application of the method, and belongs to the new technical field of a carbon quantum dot application and the technical field of a chemical power supply. The graphene coated nano-titanium dioxide of different morphological structures is obtained through control according to different carbon quantum dot concentrations, carbon quantum dots are taken as a morphological additive for inducing titanium dioxide nanocrystalline to grow into a one-dimensional nanoneedle structure, and further the titanium dioxide nanocrystalline is self-assembled into three-dimensional nano-flower-shaped structure. According to the graphene coated titanium dioxide of the nano-flower-shaped structure obtained by the method, the specific capacity of the titanium dioxide is increased, moreover, the conductivity of the graphene coated nano-titanium dioxide is greatly improved, high energy density and good cycling stability are presented in a sodium storage aspect, the graphene coated nano-titanium dioxide is characterized in simple preparation technology and low raw material cost and is applicable to commercial production.

Description

technical field [0001] The present invention relates to a method for controlling the morphology of graphene-coated nano-titanium dioxide by using carbon quantum dots as a shape-regulating additive, especially obtaining graphene-coated nano-flower structure titanium dioxide, which belongs to the new application of carbon quantum dots. Technical field; Furthermore, the application as an electrochemical energy storage device also belongs to the technical field of chemical power supply. Background technique [0002] Zero-dimensional carbon quantum dots, due to their unique physical and chemical properties, are regarded as a rising star in carbon-based materials and have attracted widespread attention. However, the application of carbon quantum dots is more focused on improving the conductivity of energy storage materials. For example, some researchers reported that carbon quantum dots modified ruthenium dioxide (RuO 2 )[Energy Environ.Sci.,6(2013)] and graphene quantum dots coa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/054C01G23/053B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G23/0536C01P2002/72C01P2004/04C01P2004/30C01P2004/62H01M4/366H01M4/48H01M4/625H01M10/054Y02E60/10
Inventor 纪效波张艳侯红帅邱晓清
Owner CENT SOUTH UNIV
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