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Preparation method of composite photoelectrode

A composite light and photoelectrode technology, applied in chemical instruments and methods, electrolytic coatings, carbon compounds, 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, the amount of pollutants adsorbed is low, and the photogenerated electrons and holes are not significantly improved. The problem of high electron and hole recombination rate, to achieve the effect of high visible light utilization performance, easy control of operation process, high yield and separation efficiency

Active Publication Date: 2019-11-29
QINGDAO AGRI UNIV
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  • 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; due to the wide band gap (~3.2eV) of TiO2, it can only absorb ultraviolet light with energy greater than its band gap energy, resulting in Its sunlight utilization rate is low
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

[0027] A preparation method of a composite photoelectrode, prepared according to the following steps:

[0028] 1. Preparation of titanium dioxide nanoribbon array photoelectrode and calcining treatment.

[0029] Cut the titanium sheet into 100mm×10mm×0.2mm strip-shaped foil, the titanium content in the titanium sheet is >99.9%, and it is washed with hydrofluoric acid in sequence, polished and polished with 600 mesh, 1000 mesh and 2000 mesh sandpaper, and deionized water respectively 1. Acetone: ethanol = 1:1 (vol) and deionized water ultrasonic cleaning 10min, put into deionized water for storage, and prepare the base material for preparing titanium dioxide nanoribbon array by anodic oxidation.

[0030] A pretreated titanium sheet was used as the anode, a platinum sheet of the same size was used as the cathode, and the electrolyte was 0.25 wt% NH 4 F and 90% ethylene glycol 100ml mixed solution, control the reaction temperature at 15°C, the voltage at 55V, oxidize for 2h, and...

Embodiment 2

[0039] A preparation method of a composite photoelectrode, prepared according to the following steps:

[0040] 1. Preparation of titanium dioxide nanoribbon array photoelectrode and calcining treatment.

[0041] Cut the titanium sheet into 100mm×10mm×0.2mm strip foil, the titanium content in the titanium sheet is >99.9%, clean it with hydrofluoric acid, polish it with 600-mesh, 1000-mesh and 2000-mesh sandpaper in turn, and wash it in deionized water respectively. 1. Acetone:ethanol=1:1 (vol) and ultrasonic cleaning in deionized water for 10 min, then put into deionized water for storage, and obtain the base material for preparing titanium dioxide nanoribbon array by anodic oxidation.

[0042] The pretreated titanium sheet was used as the anode, and the platinum sheet of the same size was used as the cathode, and the electrolyte was 0.5wt% NH 4 F and 93% ethylene glycol 100ml mixed solution, control the reaction temperature at 28°C, the voltage at 58V, oxidize for 2.5h, and s...

Embodiment 3

[0051] A preparation method of a composite photoelectrode, prepared according to the following steps:

[0052] 1. Preparation of titanium dioxide nanoribbon array photoelectrode and calcining treatment.

[0053] Cut the titanium sheet into 100mm×10mm×0.2mm strip-shaped foils. The titanium content in the titanium sheet is >99.9%. It is cleaned with hydrofluoric acid in turn, polished with 600 mesh, 1000 mesh and 2000 mesh sandpaper, and deionized water respectively. 1. Acetone: ethanol = 1:1 (vol) and deionized water ultrasonic cleaning 10min, put into deionized water for storage, and prepare the base material for preparing titanium dioxide nanoribbon array by anodic oxidation.

[0054] The pretreated titanium sheet was used as the anode, and the platinum sheet of the same size was used as the cathode, and the electrolyte was 0.6wt% NH 4 F and 95% ethylene glycol 100ml mixed solution, control the reaction temperature at 20°C, the voltage is 60V, oxidize for 3h, stir continuous...

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Abstract

The invention discloses a preparation method of a composite photoelectrode, and belongs to the field of preparation of composite photoelectrodes. The preparation method comprises the following steps of preparing a titanium dioxide nanobelt array photoelectrode, carrying out calcination treatment, preparing a graphite-phase carbon nitride nanosheet colloidal solution, preparing a graphite-phase carbon nitride-doped titanium dioxide nanobelt array composite photoelectrode, and preparing a graphite-phase carbon nitride and graphene co-deposited titanium dioxide nanobelt composite photoelectrode.The composite photoelectrode prepared by the preparation method is economic and environment-friendly, and good in stability, the operation process is easy to control, the defects of the titanium dioxide nanobelt array and the graphite phase carbon nitride are overcame, a spectral absorption range is broadened, recombination of photoelectron holes is reduced, and the composite photoelectrode is ofan environment-friendly material with visible light response and high photocatalytic activity.

Description

technical field [0001] The invention belongs to the field of composite photoelectrode preparation, and in particular relates to a preparation method of a composite photoelectrode. Background technique [0002] As a traditional n-type semiconductor photocatalyst, titanium oxide 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. It is currently the most studied photocatalyst material. However, titanium dioxide photocatalysts have the following disadvantages: the recombination rate of photogenerated electrons and holes is high; due to the wide band gap (~3.2eV) of TiO2, it can only absorb ultraviolet light with energy greater than its band gap energy, resulting in Its sunlight utilization rate is low. In order to improve the above shortcomings, the TiO2 photocatalyst is modified. The modification methods mainly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/26C25D9/08B01J27/24C01B21/082C01G23/047C01B32/192
CPCC25D11/26C25D9/08B01J27/24C01B21/0605C01G23/047C01B32/192C01P2004/80B01J35/39B01J35/33
Inventor 辛言君张彬王继芳陈清华刘国成
Owner QINGDAO AGRI UNIV
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