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Photo-anode electrode material as well as preparation method and application thereof

A technology of electrode material and photoanode, applied in the direction of electrodes, chemical instruments and methods, electrolysis process, etc., can solve the problems of low sunlight utilization efficiency, small specific surface area, difficult application, etc., achieve enhanced photocatalytic performance and improve separation efficiency , the effect of increasing the contact area

Inactive Publication Date: 2017-12-12
CHANGCHUN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, TiO 2 The solar light utilization efficiency is low (the bandgap width is about 3.0-3.2eV, and only absorbs the ultraviolet light band in the solar spectrum), the electron-hole pair recombination efficiency in the body is high, the specific surface area is small, and TiO 2 A series of problems such as the difficulty of water separation and recovery of nanoparticles have been restricting TiO 2 Important factors affecting the photocatalytic performance and application of materials
However, silicon materials have the disadvantage of being easily oxidized in water, ordinary silicon and TiO 2 It is difficult to realize the application of composite materials in photolysis of water

Method used

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  • Photo-anode electrode material as well as preparation method and application thereof
  • Photo-anode electrode material as well as preparation method and application thereof
  • Photo-anode electrode material as well as preparation method and application thereof

Examples

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preparation example Construction

[0035] The invention provides a preparation method of the photoanode electrode material, comprising the following steps:

[0036] (1) depositing silver particles on the silicon substrate in a deposition solution to obtain a silver silicon substrate; the deposition solution is a mixed solution of silver nitrate and hydrogen fluoride;

[0037] (2) etching the silver silicon substrate in an etching solution to obtain an etching substrate; the etching solution is a mixture of hydrogen peroxide and hydrogen fluoride;

[0038] (3) dissolving the silver component in the etched substrate in a nitric acid solution to obtain a porous silicon substrate;

[0039] (4) soak the porous silicon substrate in the isopropanol solution of tetrabutyl titanate and absolute ethanol in sequence, repeat the soaking for 1 to 8 times to prepare a seed layer, and obtain Si-Ti(OH ) 4 Substrate;

[0040] (5) For the Si-Ti(OH) 4 The substrate is annealed to obtain Si-TiO 2 Substrate;

[0041] (6) the ...

Embodiment 1

[0059] With the n-type silicon wafer (111) whose resistivity range is 35Ω·cm as the silicon substrate, the silicon substrate is cleaned: first, the silicon substrate is immersed in 97wt% sulfuric acid and 30wt% sulfuric acid with a volume ratio of 3:1 Hydrogen peroxide for 20 minutes to remove organic residues and heavy metal ions on the surface of the silicon substrate. Afterwards, put the substrate together with the solution in the previous step into an ultrasonic cleaning machine at room temperature for ultrasonic cleaning at a frequency of 20KHz for 2 minutes, the number of times is 3 times, to peel off insoluble substances. Finally, put the substrate into deionized water for ultrasonic cleaning (20KHz) for 2 minutes and 3 times. The substrate was taken out, blown dry with nitrogen gas, and dried at 80° C. for 20 minutes in a blast drying oven.

[0060] Porous Si was prepared by metal-assisted chemical etching (MACE) based on a two-step method: the cleaned silicon substra...

Embodiment 2

[0063] The crystal growth time was adjusted to 4 hours, and the rest of the steps and parameters were the same as in Example 1 to obtain the photoanode electrode material, marked as porous Si / SiO 2 Nanowires 4 hours.

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Abstract

The invention provides a photo-anode electrode material which comprises porous silicon and titanium dioxide nano wires, wherein the titanium dioxide nano wires are dispersed inside pores and on the surface of the porous silicon. Results of embodiments show that photonic current of the photo-anode electrode material provided by the invention is increased along with increase of bias voltage in the water photoelectrolysis process, and water photoelectrolysis can be successfully achieved on the surface; and degradation of methylene blue is achieved, the degradation efficiency is up to 48%, and the photoelectric degradation of methylene is far greater than that of photonic degradation and electric degradation. The invention further provides a preparation method and application of the photo-anode electrode material. The preparation method and the application method of the photo-anode electrode material are simple and convenient to operate and easy to implement.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a photoanode electrode material and its preparation method and application. Background technique [0002] Environmental and energy issues are two major issues facing mankind today. Since Fujishima and Honda reported photoexcited TiO in 1970 2 After splitting water, extensive studies have demonstrated the non-toxic, low-cost and high chemical stability of TiO 2 It is an outstanding photocatalytic material that can decompose pollutants in water and produce hydrogen by photolysis of water. However, TiO 2 The solar light utilization efficiency is low (the band gap width is about 3.0-3.2eV, and only absorbs the ultraviolet light band in the solar spectrum), the electron-hole pair recombination efficiency in the body is high, the specific surface area is small, and TiO 2 A series of problems such as the difficulty of water separation and recovery of nanoparticles have b...

Claims

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Application Information

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IPC IPC(8): C02F1/461C25B11/06C25B1/04C02F101/30
CPCC02F1/46109C02F2001/46142C02F2101/30C02F2101/308C02F2305/10C25B1/04C25B1/55C25B11/0775Y02E60/36
Inventor 杨继凯宋德陈张笑雄王连锴陈卫军王美婷
Owner CHANGCHUN UNIV OF SCI & TECH
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