Preparation method of mixed crystal phase niobium-doped titanium dioxide nanotube array photo-anode

A technology of nanotube array and titanium dioxide, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as expensive equipment, high cost of raw materials, complex process, etc.

Pending Publication Date: 2021-09-07
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The existing mixed phase niobium-doped titania nanotube array photoanode has the following problems: complex process, high cost of raw materials, expensive equipment required for preparation, etc. Therefore, it is urgent to research and develop a simple, safe and low-cost process. A low-cost method to prepare a mixed-phase niobium-doped titania nanotube array photoanode, while ensuring that the prepared mixed-phase niobium-doped titania nanotube array photoanode has excellent photocurrent stability and photoelectrocatalytic performance

Method used

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  • Preparation method of mixed crystal phase niobium-doped titanium dioxide nanotube array photo-anode
  • Preparation method of mixed crystal phase niobium-doped titanium dioxide nanotube array photo-anode

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Embodiment 1

[0024] This embodiment provides a method for preparing a mixed-phase niobium-doped titanium dioxide nanotube array photoanode, which specifically includes the following steps:

[0025] Pretreatment: The Ti-Nb alloy sheet with a size of 10mm×20mm×1mm was polished with 500#, 800#, 1500# and 2000# alumina water sandpaper in sequence until there was no scratch on the surface. Ultrasonic cleaning with deionized water for 5 minutes to remove surface impurities; wherein, the mass fraction of Nb in the Ti-Nb alloy sheet in this embodiment is 1%;

[0026] Anodic oxidation treatment: the pretreated Ti-Nb alloy is used as the anode, the graphite plate is used as the cathode, and 0.4wt% NH 4 F and 2vol%H 2 The ethylene glycol mixed solution of O was used as the electrolyte, and was oxidized under the condition of DC voltage of 40V for 1h, and then the residual impurities on the surface were cleaned with deionized water, N 2 Blowing and drying by air flow to obtain a mixed-phase niobium-...

Embodiment 2

[0030] This embodiment provides a method for preparing a mixed crystal phase niobium-doped titanium dioxide nanotube array photoanode. The difference in the method is that the mass fraction of Nb in the Ti-Nb alloy sheet in this embodiment is 0.5%.

[0031] Among them, the photocurrent density of the mixed crystal phase niobium-doped titanium dioxide nanotube array photoanode obtained in this example is 0.88mA / cm 2 .

Embodiment 3

[0033] This embodiment provides a method for preparing a mixed crystal phase niobium-doped titanium dioxide nanotube array photoanode. The difference in the method is that the mass fraction of Nb in the Ti-Nb alloy sheet in this embodiment is 3%.

[0034] Among them, the photocurrent density of the mixed crystal phase niobium-doped titanium dioxide nanotube array photoanode obtained in this example is 0.94mA / cm 2 .

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Abstract

The invention provides a preparation method of a mixed crystal phase niobium-doped titanium dioxide nanotube array photo-anode, which specifically comprises the following steps of performing anodic oxidation on Ti-Nb alloy, and then performing crystallization treatment to obtain the mixed crystal phase niobium-doped titanium dioxide nanotube array photo-anode, wherein the phase structure of the obtained mixed crystal phase niobium-doped titanium dioxide nanotube array photo-anode is a mixed crystal phase comprising an anatase crystal structure and a rutile crystal structure. According to the preparation method of the mixed crystal phase niobium-doped titanium dioxide nanotube array photo-anode, the process is simple, safe and reliable, the raw materials needed in the preparation process are wide in source, low in cost, non-toxic and harmless, the equipment investment needed in the preparation process is low, the preparation cost of the mixed crystal phase niobium-doped titanium dioxide nanotube array photo-anode is greatly reduced, the photo-anode material which is low in price, environment-friendly and excellent in photo-anode stability and photo-electro-catalysis performance is obtained through the preparation method.

Description

technical field [0001] The invention relates to the technical field of photoelectric catalysis, in particular to a method for preparing a mixed-phase niobium-doped titania nanotube array photoanode. Background technique [0002] Photocatalytic water splitting to produce hydrogen is an important technology to solve energy and environmental pollution problems. Photocatalytic water splitting hydrogen production technology was first reported by two Japanese scholars, Fujishima (Fujishima Akira) and Honda (Honta Kenichi) in 1972. They found that using TiO 2 As a photocatalyst, water can be decomposed into oxygen and clean, pollution-free, high calorific value, easy to store and transport hydrogen. Since the "Fujishima-Honda" effect was reported, nano-TiO 2 Because of its cheap, non-toxic, stable chemical properties and other characteristics, it has attracted widespread attention of scientific researchers. However, due to TiO 2 Intrinsic defects such as large band gap (3.2eV f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/091C25D11/26C25B1/04C25B1/55B82Y40/00B82Y30/00
CPCC25B11/091C25D11/26C25B1/04C25B1/55B82Y40/00B82Y30/00Y02E60/36
Inventor 董振标蔡义强马俊杰
Owner SHANGHAI INST OF TECH
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