Preparation method of zinc-iron-aluminum hydrotalcite/titanium dioxide composite film photo-anode for photoproduction cathode protection

A technology of photogenerated cathodic protection and titanium dioxide, applied in the direction of electrolytic coating, surface reaction electrolytic coating, coating, etc., can solve the problems of unrealized development, lower utilization efficiency of visible light, high recombination rate of photogenerated carriers, etc., and achieve improvement The effect of photogenerated carrier yield, increased light absorption range, and cheap and easy-to-obtain raw materials

Active Publication Date: 2018-02-16
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, TiO 2 It is a wide bandgap (3.2eV) conductor, it can only absorb ultraviolet light with a wavelength less than 380nm, which reduces the utilization efficiency of visible light, and TiO 2 The recombination rate of photogenerated carriers is high, so there is a big deficiency in photogenerated cathodic protection
[0003] Hydrotalcite is a layered multi-metal hydroxide. Due to its special interlayer structure and ion exchange properties, hydrotalcite has been widely used in the fields of catalysis, photochemistry, and electrochemistry. However, due to development limitations, it has not achieved better results. develop

Method used

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  • Preparation method of zinc-iron-aluminum hydrotalcite/titanium dioxide composite film photo-anode for photoproduction cathode protection
  • Preparation method of zinc-iron-aluminum hydrotalcite/titanium dioxide composite film photo-anode for photoproduction cathode protection
  • Preparation method of zinc-iron-aluminum hydrotalcite/titanium dioxide composite film photo-anode for photoproduction cathode protection

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Embodiment 1

[0038] A method for preparing a zinc-iron-aluminum hydrotalcite / titanium dioxide composite film photoanode for photogenerated cathodic protection, comprising the following steps:

[0039] A titanium sheet with a size of 40*10*0.2mm is cut from a titanium foil with a purity greater than 99.9% as the substrate, ultrasonically cleaned in absolute ethanol and deionized water in sequence, and dried in the air for use.

[0040] 1.80g NH 4 F dissolved in 10.0 mL H 2 O, then add 24.0mL H 2 o 2and 24.0mL 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.

[0041] Weigh 0.44g NH 4 Dissolve F in 8mL deionized water, add 80mL ethylene glycol and stir evenly as electrolyte. At room temperature, the above-mentioned treated titanium substrate was used as the anode, and the platinum sheet was used as the cathode, and anodized at 20V...

Embodiment 2

[0050] A method for preparing a zinc-iron-aluminum hydrotalcite / titanium dioxide composite film photoanode for photogenerated cathodic protection, comprising the following steps:

[0051] A titanium sheet with a size of 40*10*0.2mm is cut from a titanium foil with a purity greater than 99.9% as the substrate, ultrasonically cleaned in absolute ethanol and deionized water in sequence, and dried in the air for use.

[0052] 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.

[0053] Weigh 0.44g NH 4 Dissolve F in 8mL deionized water, add 80mL ethylene glycol and stir evenly as electrolyte. At room temperature, the above-mentioned treated titanium substrate was used as the anode, and the platinum sheet was used as the cathode, and anodized at 20V in the...

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Abstract

The invention discloses a preparation method of a zinc-iron-aluminum hydrotalcite / titanium dioxide composite film photo-anode for photoproduction cathode protection and relates to composite film photo-anodes. The zinc-iron-aluminum hydrotalcite / titanium dioxide composite film photo-anode is prepared by loading a titanium dioxide nanotube with zinc-iron-aluminum hydrotalcite of a unique interlayerstructure. The visible light adsorbing performance of titanium dioxide is enhanced by loading the zinc-iron-aluminum hydrotalcite, and the separation efficiency of photoproduction electrons and electron holes can be improved due to the unique interlayer structure. Compared with pure titanium dioxide nanotubes, the composite film photo-anode prepared through the method has higher photocurrent density and potential fall and can effectively relieve corrosion to stainless steel.

Description

technical field [0001] The invention relates to a composite film photoanode, in particular to a method for preparing a zinc-iron-aluminum hydrotalcite / titanium dioxide composite film photoanode for photogenerated cathodic protection. Background technique [0002] Titanium dioxide (TiO 2 ) has good photocatalytic and photosensitizing properties, and is a promising optoelectronic material. At present, titanium dioxide has been widely used in conductive materials, sensors, photocatalytic materials and other fields, and its photogenerated cathodic protection for stainless steel has also attracted extensive attention of scholars at home and abroad. However, TiO 2 It is a wide bandgap (3.2eV) conductor, which can only absorb ultraviolet light with a wavelength less than 380nm, which reduces the utilization efficiency of visible light, and TiO 2 The recombination rate of photogenerated carriers is high, so there are great deficiencies in photogenerated cathodic protection. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F13/12C25D11/26
CPCC23F13/12C25D11/26
Inventor 王秀通宁晓波雷婧李红李鑫冉南有博邵静黄彦良
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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