A highly preferentially oriented anatase-type tio 2 Nanotube array film and its preparation method

A nanotube array and preferred orientation technology, which is applied in the field of anatase TiO2 nanotube array film and its preparation, can solve the problems of reducing photocatalytic or photoelectrochemical performance, and achieve low photogenerated electron-hole recombination probability and high photocatalysis , the effect of high photoelectric conversion efficiency

Active Publication Date: 2017-04-05
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods are to improve TiO from external modification 2 properties of nanomaterials, while TiO 2 The structure of the nanotube itself is also a key factor affecting its performance. For example, TiO prepared by anodic oxidation combined with heat treatment crystallization 2 Nanotube arrays have anatase polycrystalline structure, and their grain boundaries are often defect recombination centers during the migration of photogenerated electron-hole pairs, which will reduce their photocatalytic or photoelectrochemical performance

Method used

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  • A highly preferentially oriented anatase-type tio <sub>2</sub> Nanotube array film and its preparation method
  • A highly preferentially oriented anatase-type tio <sub>2</sub> Nanotube array film and its preparation method
  • A highly preferentially oriented anatase-type tio <sub>2</sub> Nanotube array film and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Anatase-type TiO with highly preferred orientation in this example 2 Nanotube array film, its preparation process is:

[0018] (1) Cold-rolling high-purity titanium foil (Ti purity 99.5%) to obtain titanium foil with surface texture

[0019] figure 1 The X-ray diffraction patterns of the raw material high-purity titanium foil in the annealed state (a) and cold-rolled state (b), it can be seen from the figure that the relative intensities of the diffraction peaks of the annealed titanium foil are consistent with the standard spectrum (44-1294). , the (002) diffraction peak of the cold-rolled titanium foil is enhanced, indicating that the preferential orientation of Ti grains appears on the surface.

[0020] (2) After thoroughly cleaning the surface of the titanium foil with surface texture, perform anodization treatment to form TiO on the surface of the titanium foil substrate 2 Nanotube array membrane, the electrolyte used is ethylene glycol solution containing 0.3mo...

Embodiment 2

[0028] The preparation method of this example is the same as that of Example 1, except that the calcination and crystallization time in step (3) is changed to 5h.

[0029] TiO prepared in this example 2 The nanotube array film has a (004) crystal plane preferential orientation, which is tested at 36mW / cm 2 The photocurrent density was 337.6 μA / cm under UV light irradiation 2 , which is about the same as that of ordinary TiO 2 2.6 times the photocurrent density of NTAs.

Embodiment 3

[0031] The preparation method of this example is the same as that of Example 1, except that the calcination and crystallization time in step (3) is changed to 7h.

[0032] TiO prepared in this example 2 The nanotube array film has a (004) crystal plane preferential orientation, which is tested at 36mW / cm 2 Under the irradiation of ultraviolet light, the photocurrent density was 370 μA / cm 2 , which is about the same as that of ordinary TiO 2 2.9 times the photocurrent density of NTAs.

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Abstract

The invention discloses a highly preferred orientation anatase type TiO2 nanotube array membrane and a preparation method thereof. The TiO2 nanotube array membrane is characterized in that: the anatase phase in the TiO2 nanotube array membrane has strong preferred orientation, and the (004) crystal plane is roughly parallel to the array membrane surface. The highly preferred orientation TiO2 nanotube is similar to a quasi-single crystal structure, and compared with the conventional polycrystalline TiO2 nanotube has a low defect recombination center and low photoinduced electron hole recombination probability, thereby having higher photoelectric conversion efficiency and higher photocatalytic and photoelectrochemical activity.

Description

technical field [0001] The invention relates to the technical fields of nanomaterials, photocatalysis and photoelectric conversion, in particular to anatase type TiO with a highly preferred orientation 2 Nanotube array film and preparation method thereof. Background technique [0002] TiO 2 The good stability and photoelectric conversion properties of nanomaterials make them have good application prospects in the fields of photo-splitting water for hydrogen production, solar cells, photoelectrochemical detection of organic concentration, and photocatalysis. However, due to the limitation of its own structure and physicochemical properties, nano-TiO 2 There are also problems of wide band gap and high recombination probability of photogenerated electron-hole pairs, which seriously limit the improvement of its photoelectric conversion and photocatalytic performance. In response to these existing problems, researchers have carried out a lot of related research work, such as t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06B01J35/02
Inventor 徐光青王金文张旭吕珺吴玉程
Owner HEFEI UNIV OF TECH
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