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A kind of preparation method of photoelectrode

A photoelectrode and cathode technology, applied in the field of composite photoelectrodes, can solve the problems of high recombination rate of photogenerated electrons and holes of titanium dioxide, not meeting environmental development and market technical requirements, and low photocatalytic reaction efficiency, and achieving controllability. , beneficial to photocatalytic performance, beneficial to photocatalytic performance

Inactive Publication Date: 2021-01-29
QINGDAO AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, it also has certain defects: (1) the recombination rate of photogenerated carriers is high, and the efficiency of photocatalytic reaction is low; (2) pure TiO 2 Nanotube arrays are wide bandgap semiconductors, due to TiO 2 The band gap is wide and can only be excited by ultraviolet light with a wavelength of less than 400nm, and has no response in the visible light region, so the utilization of sunlight is low (about 5%), which limits their applications, and the intrinsic state titanium dioxide photogenerated electrons and space The hole recombination rate is relatively high, which also affects the improvement of photocatalytic efficiency.
[0005] In view of this, the applicant adopts the semiconductor graphitic phase carbon nitride and TiO 2 Composite, and modified with graphene on the basis of semiconductor composite, so as to improve the corresponding range of the material to visible light, improve the photoelectric conversion ability of the photoelectrode, and improve the TiO 2 Photocatalytic performance, thereby solving the problem of poor stability of the photoelectrode prepared in the prior art, low photocatalytic activity, and not meeting the requirements of environmental development and market technology

Method used

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  • A kind of preparation method of photoelectrode
  • A kind of preparation method of photoelectrode
  • A kind of preparation method of photoelectrode

Examples

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Effect test

Embodiment 1

[0029] The preparation method of the photoelectrode of the present embodiment comprises the following steps:

[0030] (1) Preparation of titanium dioxide nanotube array photoelectrode: pretreat the titanium sheet, the titanium sheet is a strip sheet with a specification of 80mm×10mm×0.2mm, wherein the titanium content in the titanium sheet is >99.9%, and the grinding and polishing are sequentially selected 600 mesh, 1000 mesh sandpaper and 2000 mesh sandpaper, and the pretreated titanium sheet is used as the anode, the platinum sheet of the same size is used as the cathode, and the electrolyte is 0.5wt% NaF and 1.0mol / L Na 2 SO 4 The 100mL mixed solution formed was oxidized in a water bath at 20°C under the oxidation voltage of 20V for 2h, rinsed with deionized water, dried with a blast dryer, and then placed in a muffle furnace at Annealed at 600°C for 2 hours to obtain a titanium dioxide nanotube array photoelectrode.

[0031] (2) Preparation of a mixed solution of carbon ...

Embodiment 2

[0035] The preparation method of the photoelectrode of the present embodiment comprises the following steps:

[0036](1) Preparation of titanium dioxide nanotube array photoelectrode: pretreatment of titanium sheet, the titanium sheet is a strip sheet with a specification of 80mm×10mm×0.2mm, wherein the titanium content in the titanium sheet is >99.9%, and the grinding and polishing are sequentially selected to 600 mesh , 1000 mesh sandpaper and 2000 mesh sandpaper, and the pretreated titanium sheet is used as the anode, the same size platinum sheet is used as the cathode, and the electrolyte is 0.5wt% NaF and 1.0mol / L Na 2 SO 4 The 100mL mixed solution formed was oxidized in a water bath at 20°C under the oxidation voltage of 20V for 2h, rinsed with deionized water, dried with a blast dryer, and then placed in a muffle furnace at Annealed at 450°C for 1.5h to obtain a titanium dioxide nanotube array photoelectrode;

[0037] (2) Preparation of a mixed solution of carbon nitr...

Embodiment 3

[0041] The preparation method of the photoelectrode of the present embodiment comprises the following steps:

[0042] (1) Preparation of titanium dioxide nanotube array photoelectrode: pretreat the titanium sheet, the titanium sheet is a strip sheet with a specification of 80mm×10mm×0.2mm, wherein the titanium content in the titanium sheet is >99.9%, and the grinding and polishing are sequentially selected 600 mesh, 1000 mesh sandpaper and 2000 mesh sandpaper, and the pretreated titanium sheet was used as the anode, the platinum sheet of the same size was used as the cathode, and the electrolyte was 100mL mixed solution composed of 0.5wt% NaF and 1.0mol / LNa2SO4. In a water bath pot, under the oxidation voltage of 20V, after oxidation for 2 hours, rinse with deionized water, dry with a blast dryer, and then place it in a muffle furnace for annealing at 700°C for 2.5 hours to obtain titanium dioxide nanoparticles tube array photoelectrode;

[0043] (2) Preparation of a mixed so...

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Abstract

The invention discloses a method for preparing a photoelectrode. The steps include: (1) preparation of a titanium dioxide nanotube array photoelectrode; (2) preparing a graphite phase carbon nitride solution and a graphene oxide solution respectively, and then mixing them by ultrasonic for a certain period of time to obtain A mixed solution of graphite phase carbon nitride and graphene oxide; (3) the titanium dioxide nanotube array composite photoelectrode is used as the working electrode, and the platinum electrode is used as the counter electrode. Chemical co-deposition to obtain a titanium dioxide nanotube array photoelectrode co-deposited with graphitic carbon nitride and graphene. Through the above method, the present invention can prepare an electrode with low cost, good stability, high photocatalytic activity, green and pollution-free, and photocatalytic activity of visible light.

Description

technical field [0001] The invention relates to the technical field of composite photoelectrodes, in particular to a method for preparing a photoelectrode. Background technique [0002] TiO 2 Nanotube array photoelectrode has the advantages of large specific surface area, high stability, and good photocatalytic performance, so it exhibits high hydrogen sensitivity, photoelectric conversion efficiency and photocatalytic performance, making it suitable for use in gas sensing materials, solar cells, photoelectric Catalysis and other aspects have immeasurable potential application value. [0003] However, it also has certain defects: (1) the recombination rate of photogenerated carriers is high, and the efficiency of photocatalytic reaction is low; (2) pure TiO 2 Nanotube arrays are wide bandgap semiconductors, due to TiO 2 The band gap is wide and can only be excited by ultraviolet light with a wavelength of less than 400nm, and has no response in the visible light region, s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/26C25D9/08B01J27/24C01B21/082C01B32/184C01G23/047
CPCC25D11/26C25D9/08B01J27/24C01B21/0605C01B32/184C01G23/047C01P2004/80B01J35/39B01J35/33
Inventor 刘国成辛言君肖洲马小涵崔春月
Owner QINGDAO AGRI UNIV