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Boron doped titanic oxide nano tube thin-film photoelectric electrode and preparing method thereof

A technology of titanium dioxide and nanotubes, which is applied in the field of boron-doped titanium dioxide nanotube thin film photoelectrodes and its preparation, can solve the problems of low photoelectric conversion efficiency, immobilization, and inability to use visible light, and achieve the improvement of photoelectric conversion efficiency. The effect of easy control of impurity concentration and high active specific surface area

Inactive Publication Date: 2009-05-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As the core of photocatalytic technology, titanium dioxide has the advantages of high catalytic activity, stable properties, corrosion resistance, and non-toxicity; but there are also some problems in application, such as it can only absorb light with a wavelength of less than 387 nanometers, and cannot use the solar energy. The visible light part of the main energy of light; the photoelectric conversion efficiency is not high; and the immobilization problem in the use of catalysts

Method used

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  • Boron doped titanic oxide nano tube thin-film photoelectric electrode and preparing method thereof
  • Boron doped titanic oxide nano tube thin-film photoelectric electrode and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take NH 4 F2.5 grams, 5 grams of oxalic acid are dissolved in 500 milliliters of water, and the pH value is adjusted to 3.7 to obtain an electrolyte; the treated titanium sheet is used as an anode, and the cathode is a nickel plate, and anodic oxidation is carried out for 120 minutes at a voltage of 20V. Obtain an amorphous titanium dioxide nanotube structure; then use chemical vapor deposition to do boron doping, where the precursor solution is 50g / L H at 50°C 3 BO 3 solution; nitrogen as carrier gas, flow rate 0.015m / s; deposition at 700°C for 2 hours; after the deposition, continue to flow nitrogen to remove the residual precursor in the deposition chamber, and then calcined at 700°C for 1 hour under the protection of nitrogen, and cooled naturally .

[0023] figure 2 (a) is a scanning electron micrograph of the surface and cross section of the nanotube film, the tube length of the nanotube is about 1 micron, and the tube diameter is about 50 nanometers. figure...

Embodiment 2

[0025] Take NH 4 F2.5 grams, 5 grams of oxalic acid are dissolved in 500 milliliters of water, and the pH value is adjusted to 4.9 to obtain an electrolyte; the treated titanium sheet is used as an anode, and the cathode is a nickel plate, and anodic oxidation is carried out for 30 minutes at a voltage of 15V. Obtain an amorphous titanium dioxide nanotube structure; then use chemical vapor deposition to do boron doping, where the precursor solution is 50g / L H at 50°C 3 BO 3 solution; nitrogen as carrier gas, flow rate 0.002m / s; deposit at 700°C for 100 minutes, continue to flow nitrogen after the deposition to remove residual precursors in the deposition chamber, then calcinate at 700°C for 2 hours under nitrogen protection, and cool naturally .

[0026] The nanotube has a length of 323 nanometers, a pipe diameter of 35 nanometers, and a boron doping concentration of 0.46 at.%.

Embodiment 3

[0028] Take NH 4 F2.5 grams, 5 grams of oxalic acid are dissolved in 500 milliliters of water, and the pH value is adjusted to 2.7 to obtain an electrolyte; the treated titanium sheet is used as an anode, and the cathode is a nickel plate, and anodic oxidation is carried out for 100 minutes at a voltage of 25V. Obtain an amorphous titanium dioxide nanotube structure; then use chemical vapor deposition to do boron doping, where the precursor solution is 50g / L H at 50°C 3 BO 3 Solution, nitrogen as the carrier gas, flow rate 0.02m / s; deposition at 700°C for 150 minutes; after the deposition, continue to flow nitrogen to remove the residual precursor in the deposition chamber, and then calcined at 700°C for 3 hours under the protection of nitrogen, and cooled naturally .

[0029] The nanotube has a length of 867 nanometers, a pipe diameter of 75 nanometers, and a boron doping concentration of 1.42 at.%.

[0030] The photoelectrode in the embodiment of the present invention is ...

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Abstract

The invention discloses a boron-doped titanium dioxide nanotube film photoelectrode which comprises a titanium sheet substrate and a boron-doped titanium dioxide nanotube film layer that grows in situ on the titanium sheet substrate, and the boron-doped concentration is 0.46at.percent to 1.42at.percent by atomic percent. A preparation method of the photoelectrode comprises the following steps: a titanium dioxide nanotube grows on the titanium sheet substrate through adopting an anode oxidation method; and the boron is then doped into the titanium dioxide nanotube layer through adopting a chemical vapor deposition method. Compared with the conventional titanium dioxide film, the titanium dioxide nanotube has larger specific surface area and stronger absorption capacity, thereby the photocatalysis performance and the photoelectric conversion efficiency of the titanium dioxide film electrode are greatly improved, the photoresponse of the film electrode is further improved through doping the nonmetal boron, more particularly the photoresponse range of materials is expanded. The invention can be applied in the fields of solar energy utilization, photoelectric conversion, photocatalysis, photoelectrocatalysis degradation of organic matters, and the like.

Description

technical field [0001] The invention relates to a boron-doped titanium dioxide nanotube film photoelectrode and a preparation method thereof, belonging to the technical field of semiconductor photoelectric catalysis. Background technique [0002] In recent years, research on photocatalysis of semiconductor nanomaterials has received extensive attention. Especially in the field of environmental pollution control, because nano-titanium dioxide has a significant photocatalytic degradation effect on many environmental pollutants, photocatalysis has developed into a new type of environmental pollution control technology. As the core of photocatalytic technology, titanium dioxide has the advantages of high catalytic activity, stable properties, corrosion resistance, and non-toxicity; but there are also some problems in application, such as it can only absorb light with a wavelength of less than 387 nanometers, and cannot use solar energy. The visible part of the main energy of li...

Claims

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Application Information

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IPC IPC(8): H01G9/20H01G9/04H01M14/00
Inventor 雷乐成张兴旺韩松苏雅玲
Owner ZHEJIANG UNIV
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