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Preparation method of tungsten trioxide (WO3)/graphene quantum dot (GQD) composite film photo-anode

A composite light and anodizing technology, applied in electrodes, electrolytic coatings, surface reaction electrolytic coatings, etc., can solve the problems of few photocatalysis research fields and late start of graphene quantum dots, and achieve enhanced photocurrent and thickness enhancement. Effect

Active Publication Date: 2017-09-15
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the late start of graphene quantum dots, there are few research fields in photovoltaic energy and photocatalysis.

Method used

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  • Preparation method of tungsten trioxide (WO3)/graphene quantum dot (GQD) composite film photo-anode
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  • Preparation method of tungsten trioxide (WO3)/graphene quantum dot (GQD) composite film photo-anode

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Clean the tungsten sheet (10mm×50mm) with distilled water, then ultrasonicate in acetone, ethanol, and distilled water for 15 minutes, and then dry it in a drying oven at 50°C for later use. Set the anodizing pulse power supply parameters, manual gear, given the required frequency 200HZ, select the required duty cycle (energy level) as 20%. The electrolyte is 1mol / L ammonium sulfate and 0.2% ammonium fluoride. Graphene quantum dots containing 5 mg were added to the electrolyte, the voltage was adjusted to 50 V, and the anodic oxidation was completed after 30 minutes. Finally, rinse the anodized test piece with distilled water, dry it with cold wind, and store it for processing.

[0018] (2) Rinse the tungsten sheet oxidized in step (1) with distilled water, blow dry, put the anodized side up into a 2cm×5cm clean porcelain boat, fill the tube furnace with nitrogen, and wait for the tube furnace to After the furnace is filled with nitrogen, raise the temperature to ...

Embodiment 2

[0021] (1) Clean the tungsten sheet (10mm×50mm) with distilled water, then ultrasonicate in acetone, ethanol, and distilled water for 15 minutes, and then dry it in a drying oven at 50°C for later use. Set the parameters of the anodizing pulse power supply, manual gear, given the required frequency 100HZ, select the required duty cycle (energy level) as 30%. The electrolyte is 1mol / L ammonium sulfate and 0.2% ammonium fluoride. Graphene quantum dots containing 10 mg were respectively added to the electrolyte, the voltage was adjusted to 50 V, and the anodic oxidation was carried out for 20 minutes before ending. Finally, rinse the anodized test piece with distilled water, dry it with cold wind, and store it for processing.

[0022] (2) Rinse the tungsten sheet oxidized in step (1) with distilled water, blow dry, put the anodized side up into a 2cm×5cm clean porcelain boat, fill the tube furnace with nitrogen, and wait for the tube furnace to After the furnace is filled with ...

Embodiment 3

[0024] (1) Clean the tungsten sheet (10mm×50mm) with distilled water, then ultrasonicate in acetone, ethanol, and distilled water for 15 minutes, and then dry it in a drying oven at 50°C for later use. Set the anodizing pulse power supply parameters, manual gear, given the required frequency 200HZ, select the required duty cycle (energy level) as 20%. The electrolyte is 1mol / L ammonium sulfate and 0.2% ammonium fluoride. Graphene quantum dots containing 15mg were respectively added to the electrolyte, the voltage was adjusted to 50V, and the anodic oxidation was carried out for 30 minutes before ending. Finally, rinse the anodized test piece with distilled water, dry it with cold wind, and store it for processing.

[0025] (2) Rinse the tungsten sheet oxidized in step (1) with distilled water, blow dry, put the anodized side up into a 2cm×5cm clean porcelain boat, fill the tube furnace with nitrogen, and wait for the tube furnace to After the furnace is filled with nitrogen,...

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Abstract

The invention provides a preparation method of a WO3 / GQDs composite film photo-anode. The problem of low WO3photovoltaic conversion efficiency is solved. A tungsten plate serves as a matrix, a sodium fluoride and sodium sulfate aqueous solution containing graphene quantum dots serves as an electrolyte solution, and a porous tungsten trioxide composite film containing the GQDs is prepared through a pulsed anodic oxidation method. The composite film is heated to 300-700 DEG C in a nitrogen pipe furnace, heat preservation is conducted for three hours, and improving of the crystallinity of the WO3 / GQDs composite film is facilitated. Compared with a pure WO3 thin film sample, a photoelectric current of the WO3 / GQDs composite film is increased obviously, and the WO3 / GQDs composite film has the long circulation life. The method is simple, convenient and easy to operate, and the prepared WO3 / GQDs composite film has high photocatalytic activity and stability.

Description

technical field [0001] The invention belongs to the field of composite visible light catalysts, and relates to a preparation method of a composite photocatalytic material, in particular to a nano-WO 3 / GQDs composite film photoanode preparation method. Background technique [0002] Nano tungsten trioxide compared with titanium dioxide, nano WO 3 The corresponding absorption wavelength is 410-500nm, and nano-WO 3 than TiO 2 The band gap is narrow, so nano-WO 3 It has better photoelectric response performance and is an ideal photoanode semiconductor material in the photoelectrochemical reaction system. Compared with ordinary semiconductor materials, nano-WO 3 It is an indirect bandgap transition, and it is cheap, easy to prepare, stable in performance, non-toxic, and harmless. It has been widely used in the field of photoelectrochemistry. The more common one is photolysis of water, in addition to photodegradation of organic pollution. Materials and solar cells, etc., the...

Claims

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Application Information

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IPC IPC(8): C25B11/06C25D11/26
CPCC25B11/04C25D11/024C25D11/26C25B1/55
Inventor 刘勇平林剑飞杨之书吕慧丹米喜红
Owner GUILIN UNIVERSITY OF TECHNOLOGY