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Method for preparing nanotube composite membrane photo-anode through hydrothermal method

A composite film and photoanode technology, which is applied in the field of Ag2S/TiO2 composite film photoanode preparation by hydrothermal method, can solve the problems of ineffective use of visible light, etc., and achieve the effects of saving raw materials, easy control of conditions, and simple operation

Active Publication Date: 2017-05-31
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the influence of a wide band gap (3.2eV), it can only absorb ultraviolet light with a wavelength less than 380nm, and cannot effectively utilize most of the visible light, and TiO 2 The photogenerated electron-hole pairs are easy to recombine, so there are great defects in photogenerated cathodic protection

Method used

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  • Method for preparing nanotube composite membrane photo-anode through hydrothermal method
  • Method for preparing nanotube composite membrane photo-anode through hydrothermal method
  • Method for preparing nanotube composite membrane photo-anode through hydrothermal method

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Embodiment 1

[0041] A kind of hydrothermal method prepares Ag 2 S / TiO 2 The method for composite film photoanode, comprises the following steps:

[0042] A titanium sheet with a size of 20*20*0.1mm was cut from a titanium foil with a purity of more than 99.9% as the substrate, cleaned ultrasonically in acetone, absolute ethanol, and deionized water in sequence, and dried in the air for use.

[0043] 0.45g NH 4 F dissolved in 2.5mL H 2 O, then add 6mL H 2 o 2 and 6mL HNO 3 Make it into a polishing solution, put the cleaned titanium sheet into the polishing solution and polish it for 30 seconds, then wash it with a large amount of distilled water and dry it for later use.

[0044] Weigh 0.22g NH 4 Dissolve F in 1.5mL deionized water, add 40mL ethylene glycol and stir evenly as electrolyte. At room temperature, the treated titanium substrate was used as the anode, and the platinum sheet was used as the cathode, anodized at 20V in the electrolyte for 0.5 hours, ultrasonically cleaned, ...

Embodiment 2

[0055] A kind of Ag for photogenerated cathodic protection 2 S / TiO 2 The preparation of composite film photoanode comprises the following steps:

[0056] A titanium sheet with a size of 20*20*0.1mm was cut from a titanium foil with a purity of more than 99.9% as the substrate, cleaned ultrasonically in acetone, absolute ethanol, and deionized water in sequence, and dried in the air for use.

[0057] 0.45g NH 4 F is dissolved in 2.5m LH 2 O, then add 6mL H 2 o 2 and 6mL HNO 3 Make it into a polishing solution, put the cleaned titanium sheet into the polishing solution and polish it for 30 seconds, then wash it with distilled water and dry it for later use.

[0058] Weigh 0.22g NH 4F, dissolved in 1.5mL deionized water, added 40mL ethylene glycol and stirred evenly as the working solution. At room temperature, the treated titanium substrate is used as the anode, and the platinum sheet is used as the cathode. After anodizing at 20V for 0.5 hours in electrolysis, ultrasoni...

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Abstract

The invention relates to a composite membrane photo-anode used for photo-production cathode protection, in particular to a method for preparing an Ag2S / TiO2 composite membrane photo-anode through a hydrothermal method. The method comprises the steps that ammonium fluoride is dissolved in ultrapure water, ethylene glycol is added, an electrolytic solution is prepared after uniform mixing, a cleaned titanium substrate serves as an anode, a platinum sheet serves as a counter electrode, the cleaned titanium substrate is cooled to the room temperature after being subjected to two-step anodic oxidation in the electrolytic solution and calcination in a muffle furnace, and then, a TiO2 nanotube can be obtained on the surface of the titanium substrate; and the obtained TiO2 nanotube is subjected to hydrothermal treatment under the action of a sulfur source and a silver source, so that Ag2S is loaded on the TiO2 nanotube, and the Ag2S / TiO2 composite membrane photo-anode is obtained. The composite membrane photo-anode prepared through the method has an excellent photo-production cathode protection effect and can enable the electric potential of 304 stainless steel connected with the composite membrane photo-anode to be reduced to 700 mv or lower through visible light irradiation in a 0.1 mol / L Na2S solution.

Description

technical field [0001] The invention relates to a composite film photoanode for photogenerated cathodic protection, in particular to a hydrothermal method for preparing Ag 2 S / TiO 2 Composite film photoanodes approach. Background technique [0002] Stainless steel is one of the most widely used materials in the world today, and its corrosion protection has always been a widely concerned issue. Although stainless steel has a certain degree of corrosion resistance compared to steel, the corrosion of stainless steel is still very serious in many harsh environments, so further research and development is still needed for the corrosion protection technology of stainless steel. [0003] TiO 2 With good photocatalytic and photosensitive properties, it is a promising optoelectronic material. However, due to the influence of a wide band gap (3.2eV), it can only absorb ultraviolet light with a wavelength less than 380nm, and cannot effectively utilize most of the visible light, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F13/08
CPCC23F13/08
Inventor 王秀通宁晓波雷婧韦秦怡李红李鑫冉
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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