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Photoelectrochemical anti-corrosion protection composite photo-anode and preparation method and application of photoelectrochemical anti-corrosion protection composite photo-anode

A photoelectrochemical and composite light technology, applied in the field of metal anti-corrosion, can solve the problems of limited application and development of photocatalytic materials, high carrier recombination rate, and can only function under light, so as to achieve high-efficiency photoelectrochemical cathodic protection, improve Photoelectric properties, the effect of reducing the carrier recombination rate

Pending Publication Date: 2020-08-28
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a photoelectrochemical anti-corrosion protection composite photoanode and its preparation method and application, aiming at solving the problem of high carrier recombination rate, limited visible light absorption and only The shortcomings of photocatalytic materials such as being able to function under light have limited the application and development of photocatalytic materials in practical environments

Method used

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  • Photoelectrochemical anti-corrosion protection composite photo-anode and preparation method and application of photoelectrochemical anti-corrosion protection composite photo-anode
  • Photoelectrochemical anti-corrosion protection composite photo-anode and preparation method and application of photoelectrochemical anti-corrosion protection composite photo-anode
  • Photoelectrochemical anti-corrosion protection composite photo-anode and preparation method and application of photoelectrochemical anti-corrosion protection composite photo-anode

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Co(OH) 2 / WO 3 Modified TiO 2 Preparation of composite photoanode:

[0047] 1) Preparation of TiO by anodic oxidation 2 For the nanotube sample, take out the Ti sheet from the absolute ethanol solution, dry it and connect it to the anode of the DC power supply, and the platinum sheet as the cathode, apply a potential in the electrolyte for anodic oxidation, and use a muffle furnace to test the material at 500 °C heat treatment to obtain TiO 2 nanotube film;

[0048] 2), using an electrochemical workstation, the TiO prepared in step (1) 2 As the working electrode, the platinum sheet and the SCE are respectively the counter electrode and the reference electrode, deposited at a constant -0.5V for 80s. The electrolyte is 5mmol / L Na 2 WO 4 2H 2 O and 15mmol / L H 2 o 2 The mixed solution was adjusted to pH 1.5 with concentrated nitric acid. After electrodeposition, the sample was washed with deionized water and dried, and calcined in a muffle furnace at 500 °C for ...

Embodiment 2

[0055] 1), use conductive glue to unmodify TiO 2 One end of the photoanode material is connected to the copper wire as the research electrode, and the other end is connected to the aluminum alloy. The coupling electrode composed of the two is used as the working electrode, the platinum sheet is used as the counter electrode, and the SCE is used as the reference electrode. The electrolyte is 3.5% NaCl solution ; Use the electrochemical workstation to test the change curve of the open circuit potential (OCP) with time under light and dark conditions, and study its photochemical protection performance on the metal auxiliary electrode;

[0056] 2) Use the noise (EN) module of the electrochemical workstation to test and study the change of the photogenerated current density generated by the electrode under light and dark conditions with time;

[0057] 3), through the copper wire TiO 2 Connect the photoanode to the aluminum alloy, place it in 3.5% NaCl solution, and use 12h light / 1...

Embodiment 3

[0059] 1), use conductive glue to make WO 3 Modified TiO 2One end of the photoanode material is connected to the copper wire as the research electrode, and the other end is connected to the aluminum alloy. The coupling electrode composed of the two is used as the working electrode, the platinum sheet is used as the counter electrode, and the SCE is used as the reference electrode. The electrolyte is 3.5% NaCl solution ; Use the electrochemical workstation to test the change curve of the open circuit potential (OCP) with time under light and dark conditions, and study its photochemical protection performance on the metal auxiliary electrode;

[0060] 2) Use the noise (EN) module of the electrochemical workstation to test and study the change of the photogenerated current density generated by the electrode under light and dark conditions with time;

[0061] 3), through the copper wire to WO 3 Modified TiO 2 Connect the photoanode to the aluminum alloy, place it in 3.5% NaCl s...

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Abstract

The invention discloses a photoelectrochemical anti-corrosion protection composite photo-anode and a preparation method and application of the photoelectrochemical anti-corrosion protection compositephoto-anode. The method comprises the steps that Co (OH) 2 and WO3 are creatively loaded on a traditional photocatalytic material TiO2 nanotube film through an electro-deposition method, the photoelectrochemical anti-corrosion protection composite photo-anode is prepared, the Co (OH) 2 can effectively promote photo-induced charge separation, so that the carrier recombination rate of the compositephoto-anode is reduced, and the WO3 has the capacity of storing charges, so that the composite photo-anode can realize photoelectric cathode protection under a dark state condition. According to the photoelectrochemical anti-corrosion protection composite photo-anode and the preparation method and application thereof, the photoelectric property of the traditional photocatalytic material is improved by carrying out proper surface modification treatment on the TiO2 nanotube film, and efficient photoelectrochemical cathodic protection of TiO2 on metals such as Q235 carbon steel in the marine environment is realized, so that corrosion of the metals such as the carbon steel in the marine environment is efficiently inhibited.

Description

technical field [0001] The invention relates to the field of metal anticorrosion, in particular to a photoelectrochemical anticorrosion protection composite photoanode and its preparation method and application. Background technique [0002] The corrosion of metals in the marine environment is very serious, and there are countless economic losses and safety problems caused by material corrosion every year. Sacrificial anode protection has developed into a cheap and large-scale protection method, and the protection current density generated by it can meet the protection requirements of most metal materials. Photoelectrochemical cathodic protection of photocatalytic materials is a very potential metal protection method, which can generate electronic transitions under light, and then transfer electrons to the surface of metal materials to inhibit metal corrosion. The characteristics of reaction consumption and environmental friendliness have attracted extensive attention of re...

Claims

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Application Information

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IPC IPC(8): C23F13/12C23F13/20C25D9/04
CPCC23F13/12C23F13/20C25D9/04
Inventor 骆静利刘素云王学万向雄志符显珠
Owner SHENZHEN UNIV
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