Cu2OTiO2 nanotube array and preparation method thereof

Abstract

The invention discloses an environmental function nano-material-Cu2O / TiO2 nanotube array and a preparation method thereof. A TiO2 nanotube array is placed in 5mmol-20mmol of CuSO4 solution, and copper is electrodeposited on the TiO2 nanotube array in a standard three-electrode system by using pulse plating so as to obtain the Cu / TiO2 composite nanotube array; and after the deposition, the Cu / TiO2 composite nanotube array is electro-oxidized for certain time in an alkaline solution NaOH to obtain a TiO2 nanotube array modified by ultrafine Cu2O nanowires with the diameter of less than 5 nanometers. The nanaowires are intertwined and connected to from a network structure to be attached to the TiO2 nanotube array but do not fully block TiO2 nanotubes; the Cu2O / TiO2 nanotube array is very favorable for the transmission of photo-carriers, reduces the recombination probability of electron-hole pairs, effectively expands the absorption range of TiO2 in the visible region, reduces optical corrosion, improves photoelectric conversion efficiency, and shows good photocatalytic efficiency.

Description

technical field [0001] The invention belongs to the field of environmental science, and in particular relates to a novel and highly efficient environmental functional nanomaterial—Cu 2 O / TiO 2 Nanotube arrays and methods of making them. Background technique [0002] Titanium dioxide nanotube arrays prepared by anodic oxidation have excellent characteristics such as large specific surface area and adjustable pore size. Its special nanotube-like structure has become a research hotspot in the scientific field of various countries. The electrolyte for preparing titanium dioxide nanotube arrays by anodic oxidation is usually an inorganic aqueous solution system. Since various ions migrate relatively fast in aqueous solution, the electrochemical anodic oxidation is also fast, and nanotube arrays can be formed in a relatively short time. However, the applied anodic oxidation voltage is generally only in the range of 10-25V, beyond this voltage range, the nanotube-like structure c...

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Problems solved by technology

However, the applied anodic oxidation voltage is generally only in the range of 10-25V, beyond this voltage range, the nanotube-like structure cannot be formed, which limits the diameter of the nanotube to a certain extent, and the nanotubes prepared in the aqueous solution system The tube wall is thin and easy to break

The invention with the application number 200410021589.X discloses a method for preparing a titanium dioxide nanotube array with a high aspect ratio. The solute of the electrolyte is fluoride and a supporting electrolyte, the solvent is water, and alcohol additives are added. Electrolysis under voltage conditions, this kind of nanotube tube is still relatively short, only 250 nanometers long, the specific surface area is not large enough, and can only absorb light in the ultraviolet region, and cannot make full use of natural sunlight

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