A kind of photoanode material and its preparation and application

A photoanode, anodizing technology, applied in metal material coating process, nanotechnology for material and surface science, electrolytic coatings, etc. The problem of fast recombination rate and hole recombination can achieve the effect of widening the absorption range, improving the utilization rate, excellent and stable anti-corrosion.

Active Publication Date: 2019-11-22
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However TiO 2 The bandgap width is wide (3.2eV), and the utilization efficiency of visible light is low. Only ultraviolet light with a wavelength of less than 380nm can be used, but ultraviolet light only accounts for about 5% of sunlight, and the recombination rate of photogenerated electrons and holes is fast, making TiO 2 Does not provide effective protection for metals in the dark state
Therefore, there is an urgent need to solve the problem of TiO 2 A method for solar light utilization and low photoelectric efficiency and photogenerated cathodic protection effect in dark state

Method used

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  • A kind of photoanode material and its preparation and application
  • A kind of photoanode material and its preparation and application
  • A kind of photoanode material and its preparation and application

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Experimental program
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Effect test

Embodiment 1

[0040] The preparation of photoanode comprises the following steps:

[0041] Pretreatment of titanium substrate: Cut a titanium sheet with a size of 20*15mm from a 0.1mm thick titanium foil (purity greater than 99.9%) as the substrate, and then ultrasonically clean it in acetone, absolute ethanol and deionized water for 1min, and then wash it with ethanol , blow dry with a hair dryer for later use. Weigh 0.45g NH 4 Dissolve F in 2.5mL deionized water, then add 6mL H 2 o 2 and 6mL of 65-68% commercial concentrated HNO 3 Make a polishing solution, put the cleaned titanium sheet into the polishing solution and polish it for 1 min, then wash it with deionized water and ethanol respectively, and dry it for later use.

[0042] TiO 2 Preparation of nanotube array film: weigh 0.22g NH 4 F, dissolved in 4mL deionized water, sonicated until it was completely dissolved, then added 40mL of ethylene glycol, and then sonicated until the two phases were completely dissolved, as a worki...

Embodiment 2

[0050] The preparation of photoanode comprises the following steps:

[0051] Pretreatment of titanium substrate: Cut a titanium sheet with a size of 20*15mm from a 0.1mm thick titanium foil (purity greater than 99.9%) as the substrate, and then ultrasonically clean it in acetone, absolute ethanol and deionized water for 1min, and then clean it with ethanol , blow dry with a hair dryer for later use. Weigh 0.45g NH 4 Dissolve F in 2.5mL deionized water, then add 6mL H 2 o 2 and 6mL of 65-68% commercial concentrated HNO 3 Make a polishing solution, put the cleaned titanium sheet into the polishing solution and polish it for 1 min, then wash it with deionized water and ethanol respectively, and dry it for later use.

[0052] TiO 2 Preparation of nanotube array film: weigh 0.22g NH 4 F, dissolved in 4mL deionized water, sonicated until it was completely dissolved, then added 40mL of ethylene glycol, and then sonicated until the two phases were completely dissolved, as a work...

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Abstract

The invention relates to a nanotube array photo anode, in particular to a BiVO4 / TiO2 nanotube array photo anode material which is stably used for photo-induced cathodic protection and preparation andapplication thereof. A preparation method of the material comprises the steps that firstly, an anodic oxidation method is adopted, Pt serves as a counter electrode, a titanium sheet substrate serves as a working electrode, and an NH4F and ethylene glycol solution serves as electrolyte; then, a titanium sheet is calcinated, so that a TiO2 nanotube array thin film is prepared on the surface of the titanium sheet; then, a hydrothermal method is adopted, and reaction solutions with Bi(NO)3 and NH4VO3 as a bismuth source and a vanadium source correspondingly are compounded; the TiO2 nanotube arraythin film is completely immersed into the reaction solutions; and after the TiO2 nanotube array thin film is put into a drying box to be subjected to constant-temperature hydrothermal treatment, calcination treatment is conducted, so that a BiVO4 / TiO2 composite film is obtained. The BiVO4 / TiO2 composite film serves as the photo anode for photo-induced cathodic protection, the utilization rate of visible light can be increased; the corrosion potential of 304 stainless steel is obviously lowered; and the good cathodic protection corrosion-resistant effect can still be achieved in the dark state.

Description

technical field [0001] The present invention relates to a nanotube array photoanode, especially a BiVO stabilized for photogenerated cathodic protection 4 / TiO 2 Nanotube array photoanode material and its preparation and application. Background technique [0002] Metal corrosion refers to the damage and deterioration of metals under various environmental conditions. At room temperature, corrosion caused by electrochemical pathways accounts for the vast majority of metal corrosion. It is estimated that one-tenth of the world's metal materials that cannot be recovered due to corrosion account for one-tenth of the total each year. Metal corrosion pervades all fields of the national economy, which may lead to some vicious accidents such as damage to pipelines and equipment, product pollution, etc., causing serious losses and harm to the economy and society. 304 stainless steel (304SS) is widely used in many fields due to its excellent mechanical, corrosion resistance and wel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F13/12C25D11/26C23C18/12B82Y30/00B82Y40/00
Inventor 王秀通李鑫冉宁晓波雷婧王文成李红玲黄彦良
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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