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A kind of preparation method of photoelectrode

A photoelectrode and cathode technology, applied in chemical instruments and methods, electrolytic coatings, electrolytic inorganic material coatings, etc., can solve the problem that the visible light absorption photogenerated electron and hole separation rate is not significantly improved, the visible light utilization rate is low, and the amount of pollutants adsorbed is low. The problem of high recombination rate of photogenerated electrons and holes, to achieve the effect of easy control of the operation process, good photoelectric catalytic performance, and reduced recombination

Active Publication Date: 2020-12-29
QINGDAO AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, titanium dioxide photocatalysts have the following disadvantages: the recombination rate of photogenerated electrons and holes is high; 2 The band gap is wide (-3.2eV), so that it can only absorb ultraviolet light with energy greater than its band gap energy, resulting in a low utilization rate of sunlight
The graphene@graphite phase carbon nitride / titanium dioxide nanotube array photoelectrode has the advantage of being recyclable, convenient and cheap, but the graphene@graphite phase carbon nitride / titanium dioxide array photoelectrode prepared by this method also has several disadvantages. The generated graphitic carbon nitride is deposited on the top of the nanotube in the form of quantum dots, which has a low utilization rate of visible light and low adsorption of pollutants, resulting in a decrease in photocatalytic efficiency; anodic oxidation and chemical vapor deposition are deposited on titanium dioxide The amount of graphite phase carbon nitride in the photoelectrode is very small, and the absorption of visible light and the separation rate of photogenerated electrons and holes are not significantly improved; the separation of graphene@graphite phase carbon nitride / titanium dioxide powder from the suspension requires a huge cost, This seriously hinders the practical application of this process in pollutant treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for preparing a photoelectrode, comprising the steps of:

[0027] 1. Preparation of titania nanoribbon array photoelectrode.

[0028] The specifications of the titanium sheet are 100mm×10mm×0.2mm strip-shaped foil, the titanium content in the titanium sheet is >99.9%, the titanium sheet is cleaned with hydrofluoric acid in turn, polished with 600 mesh, 1000 mesh and 2000 mesh sandpaper, respectively. Deionized water, acetone: ethanol = 1:1 (vol) and ultrasonic cleaning in deionized water for 10 minutes, put into deionized water for storage.

[0029] The pretreated titanium sheet was used as the anode, and the titanium dioxide nanoribbon array was prepared in situ by the constant-voltage anodizing method, and the platinum sheet of the same size was used as the cathode. 4 F and 90% ethylene glycol mixed solution, reaction temperature 15 ℃, voltage 55V, oxidation 2h, stirring continuously at a speed of 600rpm / min during the anodic oxidation process, in-situ forma...

Embodiment 2

[0037] A method for preparing a photoelectrode, comprising the steps of:

[0038] 1. Preparation of titania nanoribbon array photoelectrode.

[0039] The specifications of the titanium sheet are 100mm×10mm×0.2mm strip-shaped foil, the titanium content in the titanium sheet is >99.9%, the titanium sheet is cleaned with hydrofluoric acid in turn, polished with 600 mesh, 1000 mesh and 2000 mesh sandpaper, respectively. Deionized water, acetone: ethanol = 1:1 (vol) and ultrasonic cleaning in deionized water for 10 minutes, put into deionized water for storage.

[0040] The pretreated titanium sheet was used as the anode, and the titanium dioxide nanoribbon array was prepared in situ by the constant-voltage anodizing method, and the platinum sheet of the same size was used as the cathode. 4 F and 99% ethylene glycol mixed solution, reaction temperature 25 ℃, voltage 65V, oxidation 4h, stirring continuously at 600rpm / min speed during the anodic oxidation process, in situ generating...

Embodiment 3

[0048] A method for preparing a photoelectrode, comprising the steps of:

[0049] 1. Preparation of titania nanoribbon array photoelectrode.

[0050] The specifications of the titanium sheet are 100mm×10mm×0.2mm strip-shaped foil, the titanium content in the titanium sheet is >99.9%, the titanium sheet is cleaned with hydrofluoric acid in turn, polished with 600 mesh, 1000 mesh and 2000 mesh sandpaper, respectively. Deionized water, acetone: ethanol = 1:1 (vol) and ultrasonic cleaning in deionized water for 10 minutes, put into deionized water for storage.

[0051] The pretreated titanium sheet was used as the anode, and the titanium dioxide nanoribbon array was prepared in situ by the constant-voltage anodizing method, and the platinum sheet of the same size was used as the cathode. 4 F and 95% ethylene glycol mixed solution, the reaction temperature is 20 ° C, the voltage is 60 V, oxidized for 3 h, stirring continuously at a speed of 600 rpm / min during the anodic oxidation ...

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Abstract

The invention discloses a method for preparing a photoelectrode, which includes the following steps: preparing a titanium dioxide nanoribbon array photoelectrode, preparing a graphite phase carbon nitride nanosheet colloidal solution, preparing a mixed solution of carbon nitride and graphene oxide, and preparing a carbon nitride and graphene oxide mixed solution. The graphene oxide mixed solution is used as the electrolyte, the titanium dioxide nanoribbon array photoelectrode is used as the cathode, and the platinum sheet is used as the anode. Electrochemical deposition and drying are enough. The invention is economical and environmentally friendly, has good repeatability, the operation process is easy to control, and the conditions are mild. , the titanium dioxide nanoribbon array, graphite phase carbon nitride nanosheets, and graphene oxide are semiconductor coupled, and the prepared photoelectrode overcomes the shortcomings of the titanium dioxide nanoribbon array and graphitic phase carbon nitride themselves, broadens the spectral absorption range, and reduces the It reduces the recombination of photogenerated electron holes and is an environmentally friendly material with visible light response and high photocatalytic activity. It has the advantages of large specific surface area, high stability, and good photoelectrocatalytic performance.

Description

technical field [0001] The invention relates to the technical field of composite photoelectrode preparation, in particular to a method for preparing a titanium dioxide nanotube array photoelectrode co-modified with graphite phase carbon nitride and graphene. Background technique [0002] As a traditional n-type semiconductor photocatalyst, titanium dioxide has been widely studied and applied in the field of photocatalysis due to its superior optical and electronic properties, stable physical and chemical properties, no toxic side effects, low price and easy availability. Currently the most studied photocatalyst material. However, titanium dioxide photocatalysts have the following disadvantages: the recombination rate of photogenerated electrons and holes is high; 2 The band gap is wide (-3.2eV), so that it can only absorb ultraviolet light with energy greater than the energy of its band gap, resulting in a low utilization rate of sunlight. In order to improve the above sho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/26C25D9/08B01J27/24C01B21/082C01B32/198
CPCC25D11/26C25D9/08B01J27/24C01B21/0605C01B32/198B01J35/39B01J35/33
Inventor 辛言君陈清华昌晶马东马小涵
Owner QINGDAO AGRI UNIV