996 results about "Tio2 nanotube" patented technology

Nitrogen-doped titania nanotubes exhibiting catalytic activity on exposure to any one or more of ultraviolet, visible, and / or infrared radiation, or combinations thereof are disclosed. The nanotube arrays may be co-doped with one or more nonmetals and may further include co-catalyst nanoparticles. Also, methods are disclosed for use of nitrogen-doped titania nanotubes in catalytic conversion of carbon dioxide alone or in admixture with hydrogen-containing gases such as water vapor and / or other reactants as may be present or desirable into products such as hydrocarbons and hydrocarbon-containing products, hydrogen and hydrogen-containing products, carbon monoxide and other carbon-containing products, or combinations thereof.

The invention provides a method for a preparing TiO2 nanotube array film, relating to a method for preparing a nanotube film. The method solves the problems of the prior art that the prepared nanotube array film features thin film, irregular micro appearance, heterogeneous length of nanotubes, reunion of tube orifice and cracking of the film. The preparation method comprises: 1. a titanium plate is cut into two titanium sheets of the same size, and polishing, ultrasound processing and washing are carried out on the two titanium sheets; 2. electrolyte is prepared; 3. primary anodic oxidation is carried out on the titanium sheets; 4. demoulding is carried out; 5. secondary anodic oxidation is carried out on the titanium sheets; 6. the titanium sheets are dried after ultrasonic processing; and 7. calcination treatment is carried out, thus obtaining the TiO2 nanotube array film. In the invention, twice anodic oxidations are carried out on the titanium sheets, thus producing the TiO2 nanotube array film featuring regular micro appearance, homogeneous, smoothness, thick film layer, reunion-free tube orifice and no cracking. The preparation method of the invention features simple technique and equipment and controllable thickness of the nanotube film.

The invention relates to a method for preparing an ordered porous anodic titanium dioxide nanotube array. The method can prepare an ultra-large area defect-free titanium dioxide nanotube array film, the surface layer is the porous shape like an anodic aluminum oxide template, and the lower layer is a nanotube ordered array, thereby overcoming the common problems of easy lodging and aggregation of tubes in the prior art of preparing the anodic titanium dioxide nanotube array and simultaneously solving the problems that the prepared nanotube array film has more surface defect corrosion pits and the sediment blocks tube mouths. The nanotube array can realize the controllable growth by controlling the preparation conditions and the process and obtain the ordered array films with different tube diameters, different wall thicknesses and different tube lengths. The diameter range of the nanotubes is 20-200nm, the wall thickness range is 5-30nm, and the length range of the titanium dioxide tubes is 100nm-1mm. The invention particularly relates to a technology which can effectively and completely strip the titanium dioxide array film, effectively strip a titanium substrate from the TiO2 nanotube array and obtain the different sizes of porous nanotube array self-support films.

A method for growing bone cells. In one aspect, the present invention provides a method for growing bone cells, comprising the steps of (a) anodizing a titanium substrate to form an array of titanium dioxide nanotubes on a surface of the titanium substrate, (b) subjecting the anodized titanium substrate to a radio frequency plasma discharge to chemically modify the array of titanium dioxide nanotubes formed on the surface of the titanium substrate, (c) seeding bone cells onto the surface of the titanium substrate that has an array of titanium dioxide nanotubes thereon after the subjecting step, and (d) incubating the seeded bone cells for a period of time effective for the cells to grow and proliferate.

The invention relates to a method with low cost and simple preparation process for doping nano-Ag particles in TiO2 nanotubes. The method can realize that nanoparticles can be evenly distributed and the electrocatalysis efficiency of TiO2 nanotubes can be increased. The method comprises the following steps: firstly utilizing a two-electrode system to prepare TiO2 nanotubes, secondly placing the prepared titanium alloy or pure titanium with TiO2 nanotubes in silver nitrate solution to deposit, performing an electrocatalysis experiment in basic ethanol solution to obtain TiO2 nanotubes doped with nano-Ag particles. The current densities of the oxidation peak and reduction peak of the obtained TiO2 nanotubes are separately up to 1mA / cm<2> and 3.2mA / cm<2> and the TiO2 nanotubes has higher electrocatalysis efficiency.

The invention provides a process for preparation of super-long titanium dioxide nano-tubes arrays, which is provided with catalytic performance. The process for preparation is that titanium or titanium alloys are utilized as anode after surface treatment. Ionic compound with halogen atoms is utilized as solutes, which is dissolved in anhydrous organic solvents to utilize as electrolyte. Platinum electrode is counter electrode. After anodizing and high-temperature annealing, TiO2 nano-tubes arrays of which length is at 30-190 mu m and diameter of tube is at 20-200nm can be achieved on titanium or titanium alloys. The combination of the super-long highly orderly titanium dioxide nano-tubes arrays and matrix, which is prepared by the invention, is more firmly than the combination of traditional titania film and matrix. Film thickness of the super-long highly orderly titanium dioxide nano-tubes arrays is at 30-190 mu m. Thickness which is at the range of the film thickness of the super-long highly orderly titanium dioxide nano-tubes arrays is provided with higher photoelectric conversion efficiencies, which is favorable to application of the super-long titanium dioxide nano-tubes arrays in the field of photocatalysis, solar cell, sensor and the like.

One embodiment of the invention comprises an oral care system that comprises a photocatalytic solution. The photocatalytic solution may comprise titanium oxide nanotubes. The system may also include an oral instrument that is coupled to a light source. The photocatalytic solution will degrade oral pollutants upon exposure to illumination from the light source. The photocatalytic solution may be disposed, for example, within, on or about a dentifrice. The titanium oxide nanotubes may be rectangular in cross-section, anatase in form and less than 500 nm in width, less than 500 nm in length, and less than 5000 nm in height.

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.

The invention discloses a method by which titanium dioxide nanometer tube array layer is prepared on surface of titanium base material, wherein the titanium base materials undergo the surface pretreatment and receive the electrochemistry anodic oxidation treatment in the electrolyte containing the HF acid, the components of the mixed electrolyte are that the ammonium dihydrogen phosphate is 1 to 3mol / L and the hydrofluoric acid is 0.2 to 0.4mol / L, as a result, the amorphous form titanium dioxide nanometer tube surface structure is achieved; the subsequent heat treatment condition is that under air atmosphere, the rate of temperature rise is 3 DEG C / min, the heat is preserved for 3 hours at the temperature of 450 DEG C, the anatase titanium dioxide nanometer tube array layer is achieved after being cooled in the furnace to the room temperature. The electrolyte system prepared based on the method of the invention can control the balance of oxidation and the corrosion within a relatively long time, thereby preferably realizing the control on the shape of the titanium dioxide nanometer tube. The invention has the advantages of easy operation, low cost and orientated and order distribution of the prepared titanium dioxide nanometer tube array; moreover, the amorphous form titanium dioxide nanometer tube is generated normal to the direction of the base; the tube diameter is 80 to 100nm, the wall thickness is 18 to 21nm, the tube length is 0.7 to 2.0um, thereby the specific surface area is large.

The invention relates to a method of making a nanotubular titania substrate having a titanium dioxide surface comprised of a plurality of vertically oriented titanium dioxide nanotubes containing oxygen vacancies. The method generally comprises the steps of anodizing a titanium metal substrate in an acidified fluoride electrolyte under conditions sufficient to form a titanium oxide surface comprised of self-ordered titanium oxide nanotubes, dispersing gold nanoparticles onto the titanium oxide surface, annealing the titanium oxide surface with the gold nanoparticles thereon in a non-oxidizing atmosphere, and depositing carbon onto the annealed titanium oxide surface. The invention also relates to a hybrid gold / carbon electrode formed by the method. The invention further relates to a photo-electrolysis method for generating H2 comprising the step of irradiating a photo-anode and a photo-cathode with light under conditions suitable to generate H2, wherein the photo-anode is a nanotubular titania substrate having gold and carbon deposits.

The invention provides a method for treating industrial waste water by means of chemical oxidation or chemical deoxidation in photoelectrocatalysis, belonging to the field of environmental protection. The method comprises the following steps of: taking a titanium positive electrode oxidation method-prepared high-ordered titanium-based TiO2 nanotube array thin film as an optical positive electrode or an optical negative electrode; taking high-purity black lead as an electrode; and degrading organic matter or heavy metal ion of the industrial waste water into H2O and CO2, low valent metal ion or metal simple substance under the conditions of the connection of an external circuit and the optical radiation. The invention has the advantages that: the adopted catalytic agent optical positive electrode is the high-ordered array thin film which is self assembled by anodic oxidation and is perpendicular to the bottom of the titanium base, thereby not only overcoming the defects of the existing powder body loading thin film optical positive electrode such as bad bond, easy falling and gradually-attenuated catalysis efficiency, but also being capable of directly using the sunlight by doping the modifying property to the array thin film, and being an advanced technology for treating single waste water (dye such as paper mill organic waste water, printing and dyeing mill organic waste water, or heavy metal ion such as electroplate factory chromium-containing waste water) or complex waste water with energy saving, high efficiency, high selectivity, cleaning and low cost.

The invention relates to a design method of an asymmetric supercapacitor, in particular to a novel lithium ion supercapacitor and an assembling method thereof, and the invention solves the problems of low energy density of water electrolyte-based or non-lithium salt organic electrolyte-based supercapacitors with symmetrical or asymmetric structure and the like, and further expands the application fields of the supercapacitors. In order to greatly improve the energy density of the supercapacitor, an amorphous titanium oxide nanotube or nano-structure of a lithium ion energy storage mechanism is taken as a cathode, a carbon material of an electric double-layer energy storage mechanism is taken as an anode, the lithium salt is taken as an electrolyte and organic electrolyte solution is adopted; an amorphous titanium oxide nanostructure bulk phase lithium storage high-capacity mechanism can be fully utilized to greatly improve the energy density by virtue of the novel lithium ion supercapacitor and the assembling method; a hole channel of mesoporous structure is also useful for the diffusion of macro molecules of the organic electrolyte, which effectively improves the power density; the organic electrolyte causes the working voltage of the lithium ion supercapacitor to reach 3V; finally, the exportable extremely high energy density and power density are obtained.

The invention discloses a simple chemical vapor deposition (CVD) method for synthesizing a g-C3N4 ultra small quantum-dot modified titanium oxide nanotube catalyst. According to the invention, the previously synthesized titanium oxide nanotube array is used as the base, a precursor is firstly placed in a crucible, through adopting the high temperature treatment method, the precursor is enabled to become steam, and deposited in the titanium oxide nanotube, then the precursor is condensed into nucleuses in the titanium oxide nanotube to form g-C3N4 of the quantum dot. Due to the obtained catalyst in the visible light, the material is enabled to have the hydrogen producing performance in the visible light by utilizing the photoelectrocatalysis device. According to the invention, the CVD method is adopted to calcine materials in a muffle furnace to obtain the photocatalyst with visible-light response, and the catalyst can show the excellent visible light photocatalytic activity under the effect of photoelectrocatalysis. The catalyst is simple in preparation method, can be produced in large batch, causes no environment pollution during the preparation process, and can be widely applied to the fields of visible regions of the sunlight, solar cells, antibiosis, photocatalysis treatment of pollutants and the like.

A method of using photoelectric catalysis to detect chemical oxygen demand includes carrying out photoelectric catalytic reaction in a thin microreactor, using Ti as positive electrode, using TiO2 nanotube array film on metal Ti as light catalyst, using metal Pt as pair electrode and Ag / Ag CI as reference electrode, using inert inorganic salt as electrolyte, determining COD value by measuring Coulomb electricity value at time when organic substance of water sample in reactor is totally catalyzed and oxidized.

The invention discloses a method for preparing cuprous oxide / titanium dioxide core-shell structure array film through AC electro-deposition method. The method comprises the following steps: (1) adopting anode oxidation method to prepare TiO2 nanotube array film; (2) adopting AC electro-deposition method to prepare one-dimensional Cu2O / TiO2 core-shell structure array film, dissolving CuSO4 in a mixed solution of lactic acid and water to prepare Cu2O electro-deposition solution, using TiO2 / Ti as the working electrode and graphite as the counter electrode to deposit Cu2O under the alternating voltage, washing the electrode surface of the Cu2O / TiO2 nano-array film with deionized water, and drying to prepare the one-dimensional Cu2O / TiO2 core-shell structure array film. The method of the invention has easy technology, is easy to control, is not easy to destroy the TiO2 nanotube array structure, and is possible to realize mass production with low cost.

The invention discloses a method for preparing a nanotube doped with titanium dioxide by a two-step presynthesis method. Firstly, a sol-gel method or a hydrolysis method and other methods are adopted to synthesize nano particles doped with the titanium dioxide for target elements; secondly, the nano particles are made into the nanotube doped titanium dioxide by the hydrolysis method. The method has simple and feasible process, wide and application range for the doped elements; moreover, the nanotube prepared by the method has thin tube wall, small tube diameter, large surface area, response to visible light, and wide application prospect in aspects such as photocatalysis, photosensing, photoelectric conversion and so on.

A preparation method of a titanium dioxide nanotube based hydrogen sensor comprises steps of: pretreatment on high purity titanium sheets; a first anodic oxidization on titanium sheets; a second anodic oxidization on the titanium sheets; an annealing treatment on titanium sheets with TiO2 nanotubes grown on, after the second anodic oxidization; deposition of precious metals Pt and Pd on the TiO2 nanotubes treated with the high temperature annealing to obtain the hydrogen sensor. A preparation technology of the method is simple, conveniently operated and reasonably designed; the TiO2 nanotube array hydrogen sensor has good sensitivity and selectivity, but requires a high operating temperature, so as to restrict application fields of the sensor. Noble metal coatings of platinum and palladium are compounded on the TiO2 nanotubes; the noble metal coatings have strong absorptivity to H2 and dissociation on H2 absorbed thereon, so as to accelerate interaction between dissociated H and the TiO2 nanotube surfaces, further enhance TiO2 sensitivity to H2, and effectively promote practicability process of the TiO2 nanotube array based hydrogen sensor.

The invention relates to a method of preparing a gradient TiO2 nanotube array film by utilizing the method of multi-step anodic oxidation. Firstly, phosphoric acid, hydrofluoric acid, ammonium fluoride, glycerin and deionized water are adopted as raw materials and prepared into a water-base electrolyte and an organic electrolyte respectively; secondly, the two electrode systems composed of a titanium foil sheet and a platinum sheet are placed into the water-base electrolyte and the organic electrolyte for a repeated anodic oxidation; and finally, the TiO2 nanotube array film material with a gradient structure is generated on the titanium foil sheet. The method is fit for manufacturing photoelectrochemical apparatuses of various types and has a far-ranging application prospect in the industrial fields of light energy utilization, green energy development, sewage disposal and so on.

The invention relates to a preparation technique of cation-doped titanium oxide nanotube arrays, in particular to a method of acquiring cation-doped titanium oxide nanotube arrays that have high photo-catalytic activity in situ on a titanium alloy matrix through electrochemistry and anodic oxidation process, and doped titanium oxide nanotube on atomic scale is acquired. Titanium alloy with homogeneous component is obtained by melting process, and the titanium alloy is adopted as matrix for anodic oxidation, so as to acquire titanium oxide nanotube arrays that are evenly doped with one kind or a plurality kinds of cations; by controlling content of alloying elements, titanium oxide nanotube with controllable doping amount and doped atomic scale can be acquired, and the diameter of electronic structure of the titanium oxide nanotube can be regulated, thus further improving solar rays performance of the titanium oxide nanotube in photocatalysis, and the titanium oxide nanotube arrays can hopefully be applied in hydrogen production from water by photodecomposition.

The invention provides a method for preparing a cadmium sulfide-titanium dioxide nano-tube composite catalyst in the technical field of photocatalyst. The method comprises the following steps: 1, putting anatase TiO2 nano-particles in a polytetrafluoroethylene reaction kettle, adding deionized water into the reaction kettle, and stirring the mixture; 2, adding aqueous solution of CdCl2.2.5H2O and aqueous solution of Na2S.9H2O into the polytetrafluoroethylene reaction kettle in sequence, mixing the mixture, adding NaOH into the mixture, and performing ultrasonic oscillation on the mixture; and 3, performing microwave heating on the polytetrafluoroethylene reaction kettle, standing the mixture, cleaning the mixture until the pH of the lotion is 7, pumping and filtering the lotion, and drying the filter cake in vacuum to obtain the CdS-TiO2 nano-tube composite catalyst. In the CdS-doped TiO2 nano-tube prepared by the method, spectral response of the titanium dioxide nano-tube is expanded to a visible light range to ensure that the catalyst can absorb the visible light, so that the catalytic hydrogen production activity of the catalyst is improved.

The invention discloses a method for preparing a cuprous oxide composite titanium dioxide nanotube array, which relates to a nanotube. The method comprises the following steps of: cleaning and pre-processing the surface of a substrate material; preparing 0.1 to 1.5 weight percent of aqueous solution of hydrogen fluoride into an electrolyte, performing electrochemical anode oxidization on the substrate material, namely forming a layer of ordered TiO2 nanotube array film with controllable size on the surface of the substrate material, and performing thermal treatment on the film; preparing ethanol solution with copper salt concentration of 0.014 to 4mol / L, adding 0.001 to 0.06mmol of polyvinylpyrrolidone into the ethanol solution, after the solution is uniformly dispersed, putting the obtained film into the solution, putting the film in a water bath, adding 0.01 to 0.80mol of glucose and 0.10 to 0.95mol of NaOH, and performing ultrasonic treatment and then taking the film out; and performing thermal treatment on the obtained composite film in vacuum at the temperature of between 50 and 200 DEG C for 1 to 5 hours to obtain the cuprous oxide composite TiO2 nanotube array.

The invention belongs to the field of photo-catalysis, and in particular relates to a preparation method of a bismuth oxide halide-titanium oxide nanotube array composite photo-catalytic membrane. The method comprises the steps of: first, preparing a titanium dioxide nanotube array membrane by adopting an anode oxidization method; then, enabling bismuth ions to enter nanotubes by vacuum impregnation; and at last, with a solution containing halide ions as a precipitator, enabling the halide ions to react with the bismuth ions to generate bismuth oxide halide, wherein the bismuth oxide halide is deposited in the nanotubes and on the surface of the nanotube of the titanium dioxide nanotube array so as to obtain the bismuth oxide halide-titanium oxide nanotube array composite photo-catalytic membrane. The preparation method disclosed by the invention combines the advantages of the titanium dioxide nanotube array and the advantages of the bismuth oxide halide, is convenient to use, and can be used for preparing composite photo-catalytic membranes with different bismuth oxide halide load capacities by changing the concentration of bismuth ions, etc; and the prepared composite photo-catalytic membrane has good photo-catalysis performance, large adjustability and high controllability,.

The invention discloses a method for preparing an antibacterial active titanium oxide nanotube array composite coating material. The method comprises the following steps of: performing electrolytic oxidation to prepare a titanium oxide nanotube array with biological activity by taking titanium and an alloy thereof as an anode, taking an electrolyte solution containing phosphate anion and fluorinion as electrolyte; soaking the titanium oxide nanotube array with biological activity in the solution of silver nitrate and polyethylene glycol which are taken as a soaking solution, taking the titanium oxide nanotube array out, inducing the light in the active titanium oxide nanotube array to deposit silver particles through UV-irradiation, and obtaining the titanium oxide nanotube array composite coating material with the antibacterial property and biological activity. According to the material prepared by the method, the silver particles enter the titanium alloy or a titanium alloy matrix, and the material has long-term antibacterial stability; the thickness of the active titanium oxide nanotube array can be controlled in a range from 100 to 1000nm, and bone cell growth and nutrition transfer are promoted; the active titanium oxide generated through anodic oxidation can prevent release of titanium ion in the matrix, and the corrosion resistance of the matrix is improved; and moreover, the coating material has obvious biological activity and can induce bone apatite formation.

The invention provides a preparation method of an autodoped modified high-conductivity TiO2 nanotube array, which comprises the following steps: growing TiO2 nanotubes on a titanium sheet in a fluorine-containing electrolyte by using a two-electrode system, and calcining at 400-700 DEG C in an air atmosphere; and polarizing the calcined TiO2 nanotube array under constant negative potential in an inert electrolyte for some time to obtain the autodoped (Ti<3+>-doped) modified high-conductivity TiO2 nanotube array. The invention is simple in technique, can easily control the doping amount, and can greatly enhance the conductivity of the TiO2 nanotubes, so that the prepared autodoped modified TiO2 nanotube array not only can be used in the fields of environmental treatment, photoelectric conversion, catalytic hydrogen production and the like, but also can be used in the fields of super capacitors, lithium ion batteries and other energy storage devices.

The invention relates to a preparation method of a nanotube array positive electrode material of a lithium sulphur battery, which belongs to a preparation method of positive electrode materials of lithium sulphur batteries and solves the problems, such as poor electrical conductivity and low specific capacity, of an existing positive electrode material of a lithium sulphur battery. The preparation method comprises the following steps: (1) preparing a titanium dioxide nanotube array, (2) depositing a conductive reinforcing material, and (3) depositing elemental sulphur, wherein the steps (2) and (3) can be repeated to form a multiple depositional cycle period, so that a positive electrode material with a multilayer coaxial heterostructure is obtained, and has different sulphur loading capacities. According to the preparation method, the titanium dioxide nanotube array is taken as a substrate material, and the conductive reinforcing material and the elemental sulphur are compounded and deposited and enter titanium dioxide nanotubes to form the positive electrode material with the coaxial heterostructure, so that the conductivity of the positive electrode material is improved, the sulphur loading capacity of the positive electrode material is improved, the cycling performance and specific capacity of a lithium sulphur battery are further improved, and the preparation method has certain impelling action for speeding up the further large scale application process of the sulphated lithium battery.

The invention relates to an n-shaped titanium oxide nanotube / p-shaped diamond heterojunction photocatalytic material and a preparation method, belonging to the technical field of photocatalytic materials and the preparation thereof. The photocatalytic material is formed by growing an n-shaped TiO2 nanotube with an anatase structure on a p-shaped diamond. The preparation method comprises the following steps of: 1. growing a boron-doped p-shaped polycrystalline diamond film or boron-doped p-shaped diamond single crystal; 2. sputtering a ZnO seed crystal layer on a p-shaped diamond; 3. growing a ZnO nano rod on the ZnO seed crystal layer in the mixed water solution of zinc acetate and hexamethylene tetramine; and 4. growing the n-shaped TiO2 nanotube on the p-shaped diamond in the mixed solution of ammonium fluorotitanate and boric acid by using the ZnO nano rod as a template. The.TiO2 nanotube is prepared on the diamond by utilizing a liquid-phase synthesis method, thus heterojunction with excellent photocatalytic performance is obtained; and the method is simple, has low cost, and is suitable for large-scale production and application.

The invention discloses a preparation method of a crystallized TiO2 nanotube array. The specific steps are as follows: titanium pieces are placed into acetone to conduct ultrasonic cleaning for 30-40 minutes, after air-drying, the titanium pieces are placed into aqueous solution containing 25-28ml / L of concentrated sulfuric acid, 12-15ml / L of hydrofluoric acid and 50-65ml / L glacial acetic acid, conducting electrochemical polishing at 10-15v constant-current direct current under the room temperature for 8-20 minutes, then the polished titanium pieces are placed into ethylene glycol solution of ammonium fluoride with 0.05-1% of the bulking value concentration to conduct anodic oxidation, when conducting the anodic oxidation, the used negative pole is a platinum piece, the voltage is 60v and the reaction time is 8-12 hours, the obtained TiO2 nanotube array is placed into the water and insulation is conducted for 12-16 hours in a hydro-thermal reaction kettle with the temperature of 50 DEG C, and the crystallized TiO2 nanotube array is obtained. The preparation method has simple devices and low energy consumption, and is applicable to large-scale production; and simultaneously, the TiO2 nanotube array prepared by the method has a pure anatase phase.

The invention discloses a CuxSe / TiO2 nanotube array of a p-type semiconductor nano material and a preparation method thereof. The method comprises the following steps: putting a TiO2 nanotube array in 5mmol-20mmol of CuSO4 solution; electrodepositing elementary substance Cu on the TiO2 nanotube array by adopting pulse plating in a standard three-electrode system to obtain a Cu / TiO2 compound nanotube array; carrying out electrooxidation in an NaOH alkaline solution for a certain time after deposition is ended to obtain a superfine Cu2O nanowire-modifying TiO2 nanotube array; and then putting the Cu2O / TiO2 nanotube array in a selenium ion solution, and stirring for 30-60 min under light to obtain a copper selenide nanotube array. Based on the superfine Cu2O nanowire-modifying TiO2 nanotube array, the absorption range of TiO2 in a visible light area can be effectively expanded and the compounding probability of an electron hole pair can be reduced, and more photoelectrons and photoholes can be generated under visible light, thereby being more beneficial to Cu2O to react with the selenium ion solution to generate copper selenide. The CuxSe / TiO2 nano material with a novel structure has potential application in the aspects of solar batteries, solar radiation absorbers, nano switches, thermoelectric photoelectric converters, superconductors, air-sensitive sensors and the like.

The invention provides a preparation process of a dendritic titanium dioxide nanotube array electrode, which comprises: firstly, pre-preparing a titanium dioxide nanotube array by using an anodizing method and by using pure titanium foil as an anode and mixed solution of ammonium fluoride, lactic acid and dimethyl sulphoxide as electrolyte; secondly, growing nanorods with dendritic titanium dioxide on the pre-prepared titanium dioxide nanotubes serving as a host skeleton by using a low-temperature liquid-phase method and by using aqueous solution of hydrochloric acid and TTIP as growing solution, and thus obtaining the required dendritic titanium dioxide nanotube array; and finally, using the dendritic titanium dioxide nanotube array as a material to assemble the working electrodes of dye-sensitized solar cells, photoelectrochemical cells, photocatalysis devices and the like. The dendritic titanium dioxide nanotube array can improve the conversion efficiency of the cells and the efficiency of the photocatalytic pollutant degradation considerably; and the preparation process is low in cost, simple in process and easy in production.

The invention relates to the field of titanium dioxide photocatalysis, in particular to researches in application of a titanium dioxide nanotube modified through metal doping to the field of photocatalysis. The invention provides a simple and feasible preparation method of a copper-doped TiO2 nanotube catalyst. According to the preparation method provided by the invention, low-concentration copper is effectively doped into a titanium dioxide nanotube array through adoption of a constant-voltage electrodeposition method; and the copper inside the titanium dioxide nanotube exists in the form of copper oxide; the copper-doped TiO2 nanotube catalyst has a good photocatalytic activity under ultraviolet light and sunlight; and the composition of electron hole pairs contained in titanium dioxide is effectively inhibited through copper doping, and therefore the photocatalytic property of the titanium dioxide nanotube is enhanced. The preparation method of the photocatalyst is a constant-voltage electrochemical deposition method, in which copper sulfate is taken as electrolyte, and a preparation process is simple; and in addition, the prepared copperdoped TiO2 nanotube catalyst has a stable property and can be used repeatedly.