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Controllable crystalline form titanium dioxide and graphite alkene composite material with high efficient photoelectricity activity and preparation method thereof

A photoelectric activity, titanium dioxide technology, applied in the direction of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., to achieve the effects of common and easy-to-obtain raw materials, low cost, and simple and safe preparation process

Inactive Publication Date: 2014-04-23
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on the technology of forming mixed crystals of anatase and rutile crystals and utilizing their synergistic effect by changing the system

Method used

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  • Controllable crystalline form titanium dioxide and graphite alkene composite material with high efficient photoelectricity activity and preparation method thereof
  • Controllable crystalline form titanium dioxide and graphite alkene composite material with high efficient photoelectricity activity and preparation method thereof
  • Controllable crystalline form titanium dioxide and graphite alkene composite material with high efficient photoelectricity activity and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Add 3ml of TiCl3 hydrochloric acid solution (volume fraction 15% to 20%) to 30ml of absolute ethanol, add 1.75ml of acetic acid, 1ml of polyethylene glycol 200 (PEG200) and 0.2g of urea in succession under continuous stirring, and make the prepared The reaction solution is put into a hydrothermal reaction kettle, reacted at 150-180°C for 10-12 hours, cooled, the precipitate in the product is separated, washed with water and alcohol, filtered, and dried to obtain the product.

[0043] figure 1 is prepared TiO 2 It can be seen from the XRD pattern of the product that it is mixed crystals of anatase and rutile, of which anatase accounts for about 80% and rutile accounts for about 20%. The product has high crystallinity and purity. figure 2 is prepared TiO 2 The low-magnification field emission scanning electron microscope image of the product shows that the product is composed of a large number of spherical structures, the size of the balls is uniform, and the average d...

Embodiment 2

[0045] 3ml of TiCl3 hydrochloric acid solution (volume fraction 15%~20%) solution is added to alcoholic water, alcoholic water volume ratio is respectively 0: 30 (a), 10: 20 (b), 20: 10 (c) altogether 30ml, Add 1.75ml of acetic acid, 1ml of polyethylene glycol 200 (PEG200) and 0.2g of urea successively under continuous stirring, put the prepared reaction solution into a hydrothermal reaction kettle, react at 150-200°C for 8-24 hours, cool, The precipitate in the product was separated, washed with water and alcohol, filtered, and dried to obtain the product. The sample prepared according to Example 1 is named (d).

[0046] image 3 is prepared TiO 2 The XRD pattern of product, as can be seen from the figure, along with the increase of the amount of ethanol, TiO 2 The crystal form of TiO gradually changes from pure anatase to mixed crystal of anatase and rutile, so that we can control the ratio of alcohol and water to control the TiO 2 The crystal form to get the crystal for...

Embodiment 3

[0048] The amount of Example 1 is scaled up. Add 12ml of TiCl3 hydrochloric acid solution (volume fraction 15% to 20%) to 30ml of absolute ethanol, add 1.7ml of acetic acid, 4ml of polyethylene glycol 200 (PEG200) and 0.8g of urea in succession under continuous stirring, and make the prepared The reaction solution is put into a hydrothermal reaction kettle, reacted at 150-180°C for 8-12 hours, cooled, the precipitate in the product is separated, washed with water and alcohol, filtered, and dried to obtain the product.

[0049] Figure 4 is prepared TiO 2 From the XRD pattern of the product, it can be seen from the figure that when the concentration of titanium source, PEG200, and urea in the system is enlarged, the crystal form changes from mixed crystal to pure anatase and the product has high crystallinity and purity. We can control TiO according to the amount 2 crystal form, so as to obtain the crystal form we need. Figure 5 It is a low-magnification field emission sca...

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Abstract

The invention discloses controllable crystalline form titanium dioxide and a graphite alkene composite material with high efficient photoelectricity activity and a preparation method thereof. The composite material is formed by mixing TiO2 powder and graphite alkene or scattering the TiO2 powder in oxidized graphite alkene dispersing agents to perform hydro-thermal reaction. The mass ratio of TiO2 powder and graphite or graphite alkene is 1:1 to 500:1. The preparation method is simple, low in cost and environmental-friendly. The controllable crystalline form titanium dioxide and a graphite alkene composite material with high efficient photoelectricity activity can control crystalline form of the obtained TiO2 according to the ratio of alcohol and water or amount of titanium sources. When the amount is amplified, the controllable crystalline form titanium dioxide and a graphite alkene composite material with high efficient photoelectricity activity have good performances. After the graphite alkene is composed, photocatalysis is greatly improved. All obtained products are applied to fields of dye sensitization solar cells, catalysts, lithium ion cells, sensing and the like.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and in particular relates to a controllable crystalline titanium dioxide and graphene composite material with specific high-efficiency photoelectric activity. Background technique [0002] TiO 2 Due to its excellent physical and chemical activity, it has been widely interested and studied by people. TiO2 can be used as photovoltaic material and photocatalyst. TiO 2 It is used to prepare dye-sensitized solar cells. The principle of power generation is that dye molecules absorb sunlight energy and transition to an excited state. The excited state is unstable and releases electrons. The electrons are quickly injected into the adjacent TiO 2 conduction band, the electrons lost in the dye are quickly compensated from the electrolyte and enter the TiO 2 Electrons in the conduction band eventually enter the conductive film, and then pass through the outer loop to generate photocurrent. TiO with n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/18C01G23/053H01G9/20H01L51/46
CPCY02E10/542Y02E10/549
Inventor 周幸福涂洛潘浩
Owner NANJING TECH UNIV
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