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Web-type three-dimensional perforated macroporous-mesoporous-structure titanium dioxide material, and preparation method and application thereof

A technology of titanium dioxide and mesoporous structure, applied in the direction of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the problems of low photocatalytic efficiency, low high-rate performance, low electronic conductivity, etc., and achieve excellent Cycling performance, less harsh process conditions, and high specific surface area

Inactive Publication Date: 2015-07-22
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electronic conductivity of titanium dioxide is relatively low and titanium dioxide nanoparticles are easy to agglomerate, so its high-rate performance is relatively low
However, due to its wide band gap, it can only be excited in the ultraviolet band, and the photogenerated electron-hole pairs are easy to recombine, and the photocatalytic efficiency is not high, which limits its application in the field of photocatalysis.

Method used

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  • Web-type three-dimensional perforated macroporous-mesoporous-structure titanium dioxide material, and preparation method and application thereof
  • Web-type three-dimensional perforated macroporous-mesoporous-structure titanium dioxide material, and preparation method and application thereof
  • Web-type three-dimensional perforated macroporous-mesoporous-structure titanium dioxide material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Disperse 5 g of rapeseed pollen into 50 ml of absolute ethanol and stir for 24 hours, then filter to obtain 40 ml of supernatant containing pollen film. Add 0.4g (6.9*10 -5 mol) P123, and stirred evenly to obtain a supernatant containing P123. Add 8g of titanium sulfate (0.033mol in mole) into 100ml of absolute ethanol and stir for 24h. Then take 10ml of completely dissolved titanium sulfate ethanol solution and add it dropwise to the supernatant containing P123, and stir for 2h. Then add 40ml of water and stir for 30min to mix evenly, transfer it to a glass watch glass with a diameter of 20cm, place it in an oven at 40°C for 72h, and keep the relative humidity above 60%. Then the obtained gel was crystallized at 60°C for 12 hours, and the product was calcined in air at 500°C to remove the biological template agent and surfactant, and then the three-dimensional through macropore-mesoporous structure titanium dioxide could be obtained. During this process, the surfact...

Embodiment 2

[0064] Disperse 5 g of rapeseed pollen into 50 ml of absolute ethanol and stir for 24 hours, then filter to obtain 40 ml of supernatant containing pollen film. Add 0.4g (6.9*10 -5 mol) P123, and stirred evenly to obtain a supernatant containing P123. A certain amount of tetrabutyl titanate was added dropwise to the above supernatant containing P123, and stirred for 2 h. Then add 40ml of water and stir for 30min to mix evenly, transfer it to a glass watch glass with a diameter of 20cm, place it in an oven at 40°C for 72h, and keep the relative humidity above 60%. Then the obtained gel was crystallized at 60°C for 12 hours, and the product was calcined at 500°C in the air to remove the biological template agent and surfactant, and the three-dimensional macroporous-mesoporous structure titanium dioxide could be obtained. Transfer it to a glass watch glass with a diameter of 20 cm, place it in an oven at 40° C. for 72 h, and keep the relative humidity above 60%. Then the obtain...

Embodiment 3

[0067] Disperse 5 g of lotus pollen in 50 ml of absolute ethanol and stir for 24 hours, and filter to obtain 40 ml of supernatant containing pollen film. Add 0.4g (6.9*10 -5 mol) P123, and stirred evenly to obtain a supernatant containing P123. Add 8g of titanium sulfate (0.033mol in mole) into 100ml of absolute ethanol and stir for 24h. Then take 10ml of completely dissolved titanium sulfate ethanol solution and add it dropwise to the supernatant containing P123, and stir for 2h. Then add 40ml of water and stir for 30min to mix evenly, transfer it to a glass watch glass with a diameter of 20cm, place it in an oven at 40°C for 72h, and keep the relative humidity above 60%. Then the obtained gel was crystallized at 60°C for 12 hours, and the product was calcined in air at 500°C to remove the biological template agent and surfactant, and then the three-dimensional through macropore-mesoporous structure titanium dioxide could be obtained. Transfer it to a glass watch glass wit...

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Abstract

The invention relates to a web-type three-dimensional perforated macroporous-mesoporous-structure titanium dioxide material, and a preparation method and application thereof. The material is formed by regulating the self-assembly of biomolecules; the crystal form is anatase; on the basis of the macroporous structure formed by accumulation of titanium dioxide particles, the embedded mesopores are regulated on the macroporous structure, and the pore wall and particles thereof, thereby forming the three-dimensional perforated macroporous-mesoporous structure; and the pore size of the macropores is 90-100nm, the pore wall thick is 8-10nm, and the pore size of the mesopores distributed in the titanium dioxide particles is 3-5nm. Compared with the prior art, the material provided by the invention has the advantages of simple preparation process and non-severe technological conditions, and can implement large-scale industrial production; and the method is safer and cleaner to operate. The material has the special macroporous-mesoporous perforated pore structure, and thus, is beneficial to transfer and embedment of lithium ions, thereby enhancing the electrochemical properties. The material obtains higher reversible capacity and excellent cycle performance.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic materials, in particular to a "spider web" three-dimensional penetrating macropore-mesoporous structure titanium dioxide material and its preparation method and application. Background technique [0002] Rechargeable lithium-ion batteries with high storage capacity and cycle stability are regarded as a versatile, clean and most promising energy source for rapidly developing portable electronic devices and hybrid electric vehicles. The anode materials used in commercial lithium-ion batteries are basically graphite. However, the electrode potential of graphite is close to that of lithium. When the battery is overcharged, some lithium ions may be deposited on the surface of the graphite electrode, forming lithium dendrites and causing safety problems. In addition, when a lithium-ion battery is charged and discharged for the first time, a solid electrolyte interphase (SEI film) will be formed ...

Claims

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Application Information

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IPC IPC(8): C01G23/047B01J21/06H01M4/485B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 李昱任小宁吴亮毛成龙肖怀远吴旻陈丽华王洪恩苏宝连
Owner WUHAN UNIV OF TECH
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