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Preparation method of graphene/CdTe-TiO2 composite membrane photo-anode

A technology of graphene and composite film, which is applied in the direction of electrolytic inorganic material coating, electrolytic coating, surface reaction electrolytic coating, etc., can solve the problems of low photoelectric efficiency, visible light cannot be effectively used, and visible light utilization rate is not high, so as to avoid The effect of corrosion

Active Publication Date: 2015-01-07
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 There are some technical problems in the actual application process: (1) When the light is illuminated, the TiO 2 Due to the limitation of wide bandgap (3.2eV), it can only absorb ultraviolet light with a wavelength less than 380nm, and most of the visible light cannot be effectively used, and the photoelectric efficiency is low
(2) When the light turns into a dark state, the generated photogenerated electron-hole pairs recombine quickly, which cannot provide long-term cathodic protection for metals
However, simply using graphene-modified TiO 2 material, namely graphene-TiO 2 Composite materials, which do not have a high utilization rate of visible light

Method used

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  • Preparation method of graphene/CdTe-TiO2 composite membrane photo-anode
  • Preparation method of graphene/CdTe-TiO2 composite membrane photo-anode
  • Preparation method of graphene/CdTe-TiO2 composite membrane photo-anode

Examples

Experimental program
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Effect test

Embodiment 1

[0055] Take a rectangular pure titanium foil with a thickness of 0.1 mm as a sample, which is 15 mm long and 10 mm wide. The surface of the sample was sequentially polished with 400-1500 grit sandpaper, and then ultrasonically cleaned in acetone, absolute ethanol and deionized water for 10 minutes.

[0056] Measure 1 mL of hydrofluoric acid into 100 mL of deionized water to make a hydrofluoric acid solution. At room temperature, with the cleaned titanium foil substrate as the anode and the platinum sheet as the cathode, anodize at 30V for 30min in the above mixed solution. Then the sample was placed in a muffle furnace and calcined at 450 °C for 2 hours, and then cooled to room temperature with the furnace, that is, TiO was prepared on the surface of the titanium foil substrate. 2 nanotube array film.

[0057] Using cyclic voltammetry deposition method, first on TiO 2 Graphene quantum dots are deposited on the surface of the nanotube array film. 0.1 g of graphite oxide was...

Embodiment 2

[0063] Graphene / CdTe-TiO 2 Preparation method of composite film photoanode:

[0064] Take a rectangular pure titanium foil with a thickness of 0.1 mm as a sample, which is 15 mm long and 10 mm wide. The surface of the sample was sequentially polished with 400-1500 grit sandpaper, and then ultrasonically cleaned in acetone, absolute ethanol and deionized water for 10 minutes.

[0065] Measure 1 mL of hydrofluoric acid into 100 mL of deionized water to make a hydrofluoric acid solution. At room temperature, with the cleaned titanium foil substrate as the anode and the platinum sheet as the cathode, anodize at 30V for 30min in the above mixed solution. Then the sample was placed in a muffle furnace and calcined at 450 °C for 2 hours, and then cooled to room temperature with the furnace, that is, TiO was prepared on the surface of the titanium foil substrate. 2 nanotube array film.

[0066] Using cyclic voltammetry deposition method, first on TiO 2 Graphene quantum dots are d...

Embodiment 3

[0072] Graphene / CdTe-TiO 2 Preparation method of composite film photoanode:

[0073] Take a rectangular pure titanium foil with a thickness of 0.1 mm as a sample, which is 15 mm long and 10 mm wide. The surface of the sample was sequentially polished with 400-1500 grit sandpaper, and then ultrasonically cleaned in acetone, absolute ethanol and deionized water for 10 minutes.

[0074] Measure 1 mL of hydrofluoric acid into 100 mL of deionized water to make a hydrofluoric acid solution. At room temperature, with the cleaned titanium foil substrate as the anode and the platinum sheet as the cathode, anodize at 30V for 30min in the above mixed solution. Then the sample was placed in a muffle furnace and calcined at 450 °C for 2 hours, and then cooled to room temperature with the furnace, that is, TiO was prepared on the surface of the titanium foil substrate. 2 nanotube array film.

[0075] Using cyclic voltammetry deposition method, first on TiO 2 Graphene quantum dots are d...

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Abstract

The invention relates to a preparation method of a graphene / CdTe-TiO2 composite membrane photo-anode for photo-induced cathodic protection and relates to a composite membrane photo-anode. The invention provides an efficient preparation method of the graphene / CdTe-TiO2 composite membrane photo-anode for photo-induced cathodic protection. The method comprises the following steps: sequentially carrying out anodic oxidation and calcining by taking a titanium foil as a matrix, taking a hydrofluoric solution as an electrolyte solution and taking platinum as a counter electrode, so that a TiO2 nanotube array membrane can be prepared on the titanium surface; firstly, by using a cyclic voltammetric deposition method, depositing graphene quantum dots on the surface of the TiO2 nanotube array membrane, and by taking a prepared graphene oxide solution as an electrolyte solution, taking platinum as a counter electrode and taking saturated calomel electrode (SCE) as a reference electrode, depositing graphene on the surface of the TiO2 nanotube array membrane, so that a graphene / TiO2 composite membrane is obtained; and then depositing CdTe quantum dots on the surface of the obtained graphene / TiO2 composite membrane, and by taking a mixed solution of TeO2, CdSO4 and a hydrochloric acid as an electrolyte solution, taking platinum as a counter electrode and taking a saturated calomel electrode (SCE) as a reference electrode, depositing CdTe on the surface of the graphene / TiO2 composite membrane, so that a graphene / CdTe-TiO2 composite membrane is prepared finally.

Description

technical field [0001] The invention relates to a composite film photoanode, in particular to a graphene / CdTe-TiO used for photogenerated cathodic protection 2 A method for preparing a composite film photoanode. Background technique [0002] TiO 2 Due to its excellent chemical properties and photoelectrochemical properties, its preparation has attracted great attention in the protection of metals. The basic principle is: under light conditions, TiO 2 is excited and generates photo-generated electrons, and the photo-generated electrons from TiO 2 The surface is transferred to the metal, which makes the potential of the metal shift negatively and is lower than its self-corrosion potential, thus protecting the metal. Compared with traditional cathodic protection methods, this technology utilizes TiO 2 The photoelectric effect does not need to sacrifice the anode, nor does it need to consume electric energy, and the cost is lower, showing attractive application prospects. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F13/12C25D11/26C25D9/04C25D5/18C25D5/54
Inventor 李红王秀通张亮侯保荣
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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