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a tio 2 Fabrication method of /au/copi composite nanotube array photoanode

A nanotube array, photoanode technology, applied in electrodes, coatings, electrolytic components, etc., can solve the problem of low reaction rate and achieve the effect of increasing active sites, high efficiency and uniform morphology

Active Publication Date: 2021-04-27
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However TiO 2 / Au surface splits water to produce oxygen reaction due to the large number of electron transfers (4 electrons), there is a high overpotential, TiO 2 / The active sites on the Au surface are not enough to allow the smooth generation of oxygen, resulting in a lower reaction rate

Method used

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  • a tio <sub>2</sub> Fabrication method of /au/copi composite nanotube array photoanode
  • a tio <sub>2</sub> Fabrication method of /au/copi composite nanotube array photoanode
  • a tio <sub>2</sub> Fabrication method of /au/copi composite nanotube array photoanode

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Experimental program
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Effect test

Embodiment 1

[0032] A kind of TiO 2 The preparation method of Au / CoPi composite nanotube array photoanode is carried out as follows:

[0033] 1) TiO 2 Fabrication of Nanotube Array Thin Films

[0034] The titanium sheet substrate was pretreated with an equal volume of NH at a concentration of 0.4M 4 F and H at a concentration of 0.2M 3 PO 4 The mixed solution was used as the electrolyte, the Ti sheet was used as the working electrode, and the Pt sheet was used as the counter electrode. Anodization was carried out at a voltage of 20 V for 7 h, and then placed in a muffle furnace for 500 o C roasted for 2 h to obtain anatase TiO 2 nanotube array films;

[0035] 2) TiO 2 / Preparation of Au nanotube array films

[0036] TiO 2 Nanotube arrays in 1 mM HAuCl 4 The solution was ultrasonically treated for 5 min, and then it was used as the working electrode, the Pt sheet was used as the counter electrode, and the Ag / AgCl electrode was used as the reference electrode, and HAuCl with a conc...

Embodiment 2

[0040] A kind of TiO 2 The preparation method of the / Au / CoPi composite nanotube array photoanode is characterized in that it proceeds as follows:

[0041] 1) TiO 2 Fabrication of Nanotube Array Thin Films

[0042] The titanium sheet substrate was pretreated with an equal volume of NH at a concentration of 0.4M 4 F and H at a concentration of 0.2M 3 PO 4 The mixed solution was used as the electrolyte, the Ti sheet was used as the working electrode, and the Pt sheet was used as the counter electrode. Anodization was carried out at a voltage of 20 V for 7 h, and then placed in a muffle furnace for 500 o C roasted for 2 h to obtain anatase TiO 2 nanotube array films;

[0043] 2) TiO 2 / Preparation of Au nanotube array films

[0044] TiO 2 Nanotube arrays in 1 mM HAuCl 4 The solution was sonicated for 6 min, and then it was used as the working electrode, the Pt sheet was used as the counter electrode, and the Ag / AgCl electrode was used as the reference electrode. 4 The ...

Embodiment 3

[0048] A kind of TiO 2 The preparation method of the / Au / CoPi composite nanotube array photoanode is characterized in that it proceeds as follows:

[0049] 1) TiO 2 Fabrication of Nanotube Array Thin Films

[0050] The titanium sheet substrate was pretreated with an equal volume of NH at a concentration of 0.4M 4 F and H at a concentration of 0.2M 3 PO 4 The mixed solution is the electrolyte, the Ti sheet is used as the working electrode, and the Pt sheet is used as the counter electrode. Anodization is carried out at a voltage of 20 V for 7 hours, and then placed in a muffle furnace for 500 o C roasted for 2 h to obtain anatase TiO 2 nanotube array films;

[0051] 2) TiO 2 / Preparation of Au nanotube array films

[0052] The TiO prepared in step 1) 2 nanotube arrays in 1 mM HAuCl 4 The solution was sonicated for 3 min, and then it was used as the working electrode, the Pt sheet was used as the counter electrode, and the Ag / AgCl electrode was used as the reference el...

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Abstract

A kind of TiO 2 / Au / CoPi composite nanotube array photoanodes, sequentially including TiO 2 Preparation of Nanotube Array Thin Films, TiO 2 / Au nanotube array film preparation and TiO 2 / Au / CoPi nanotube array film preparation, characterized in that: the TiO 2 / Au / CoPi nanotube array thin film is prepared by TiO 2 / Au nanotube array film as working electrode, Pt sheet as counter electrode, Ag / AgCl electrode as reference electrode, Co(NO 3 ) 2 The phosphate buffer solution is used as the electrolyte, and the cocatalyst of cobalt phosphate (CoPi) is photodeposited under visible light, and then taken out, washed with deionized water, and dried. The preparation method of the present invention uniformly deposits Au nanoparticles onto TiO 2 surface, no agglomeration, and uniform morphology, the cobalt phosphate (CoPi) cocatalyst is deposited on the surface of Au nanoparticles quickly and accurately, without depositing on TiO 2 On the surface, the active sites for water decomposition and oxygen generation reaction are increased, and the catalytic performance of the cobalt phosphate (CoPi) cocatalyst is efficiently exerted. Under the same bias voltage, the photoelectric density is about TiO 2 / Au 3 times.

Description

technical field [0001] The invention relates to the technical field of photoelectric catalysis, in particular to a TiO 2 Preparation method of / Au / CoPi composite nanotube array photoanode. Background technique [0002] Semiconductor photocatalytic water splitting to produce hydrogen is an important technology to solve energy and environmental pollution problems. The core of its research focuses on the development of photoanode materials with a wide range of photoresponse and low hole-electron recombination rate. In 2005, Tian Yang and Tatsuma found that Au nanoparticles loaded onto TiO 2 When the surface is irradiated by visible light, there is a phenomenon of plasmon-induced charge separation (PICS), that is, the hot electrons generated by Au due to the localized surface plasmon resonance (LSPR) effect can cross Au and TiO 2 The Schottky barrier formed at the interface is rapidly transferred to the TiO 2 On the conduction band of Au, while holes accumulate on the surface...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/063C25B11/053C25B11/093C25B1/55C25B1/04C25D11/26C25D3/48C25D5/18C25D9/04
CPCC25B1/04C25D3/48C25D5/18C25D9/04C25D11/26C25B1/55C25B11/051C25B11/057C25B11/093Y02E60/36
Inventor 吴玲李婷玉余海东申露萍颜家保俞丹青
Owner WUHAN UNIV OF SCI & TECH
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