89 results about "Tio2 nanofibers" patented technology

The invention discloses a precious metal/zinc indium sulfide/titanium dioxide nano heterostructure photocatalyst, which is characterized in that ultra-thin zinc indium sulfide nanosheets are grown on the surface of titanium dioxide nanofibers, then precious metal nanoparticles are assembled on positive and negative surfaces of the ultra-thin zinc indium sulfide nanosheets, so that precious metal/zinc indium sulfide/titanium dioxide nano heterostructure is hierarchically constructed. The preparation method includes adding glacial acetic acid, butyl titanate and polyvinylpyrrolidone into anhydrous ethanol, preparing butyl titanate/polyvinylpyrrolidone composite nanofibers by electrostatic spinning, and performing high temperature calcination to obtain titanium dioxide nanofibers; adding zinc acetate dihydrate, indium nitrate hexahydrate, cysteine and sodium hydroxide into deionized water, then adding the titanium dioxide nanofibers, and performing hydrothermal reaction to obtain zinc indium sulfide/titanium dioxide heterostructure; and activating the heterostructure in a stannous chloride aqueous solution, and then performing in-situ reduction in a precious metal brine solution. The photocatalytic material is excellent in performance of photocatalytically splitting of water into hydrogen.

The invention belongs to the technical field of ultraviolet light dependent resistors and relates to a method for preparing a titanium dioxide nanofiber ultraviolet light dependent resistor. The method includes that firstly experiment parameters are controlled, an electrostatic spinning method is utilized to prepare TiO2/polyvinylpyrrolidone (PVP) composite nanofiber film, the TiO2/PVP composite nanofiber film is subjected to heat treatment in a muffle furnace to obtain a TiO2 nanofiber film, the TiO2 nanofiber film is placed on a plastic sheet, electrodes are fixed by electric conduction elargol, and a polydimethylsiloxane (PDMS) encapsulating adhesive is utilized for damp-proof protective encapsulation to obtain a light dependent resistor element. According to the method for preparing the titanium dioxide nanofiber ultraviolet light dependent resistor, the titanium dioxide light dependent resistor is safe and non-toxic, environment-friendly, raw materials are easy to obtain, the preparing process is simple, the cost is low, the market potential is large, and the service life is long.

The invention discloses a noble metal-titanium dioxide nano fiber complex and a preparation method and application thereof. The method comprises the following steps of: 1) mixing solution of titanate and solution of polyvinyl pyrrolidone uniformly to form electrostatic spinning stock solution, performing electrostatic spinning to obtain TiO2 nano fibers, and calcining the TiO2 nano fibers to obtain anatase TiO2 nano fibers; and 2) dispersing the anatase TiO2 nano fibers into alcohol, adding noble metal salt solution, mixing the solution uniformly, and performing intermittent microwave heatingto obtain the noble metal-titanium dioxide nano fiber complex. The noble metal-titanium dioxide nano fiber complex provided by the invention has small granule diameter (5 nanometers) and narrow granule distribution, the granules are dispersed high and aggregated, the noble metal content can be randomly controlled from 5 to 60 percent, and the complex has high electric catalytic activity and can be used as an electric catalyst for a fuel cell oxide electrode.

The invention discloses a PdNi / TiO2 nanofiber anode catalyst for a direct methanol fuel cell and a preparation method thereof. The catalyst comprises 95-97wt% of TiO2 nanofiber and 3-5% of nano PdNi. According to the invention, TiO2 nanofiber with high specific surface is used as a carrier to compound with PdNi to form a multicomponent catalyst; composite of Pd and Ni enhances conductive performance of TiO2 and catalysis performance of TiO2 on methanol; intermediates like CO generated from methanol oxidation are adsorbed and transferred to a catalyst surface and are directly treated with deep oxidation into an end-product of CO2. PdTi has a price much lower than those of precious metals like Pt and Ru, and also a small dosage in the catalyst, so as to substantially reduce catalyst costs and enhance catalyst capability of resisting CO poison.

The present invention discloses a quasi-solid dye sensitized flexible solar cell battery and a preparation method of the battery. A layer of TiO2 nanometer fiber film is attached as optical anode to a metal wire mesh coated with TiO2 nanometer particles, a sort of organic dye is used as sensitizer, polymer gel electrolyte is filled, a stainless steel plate coated with conductive polymer is used as the counter electrode, a non-conductive polyester film with good light transmittance performance is used as an encapsulation film to encapsulate the assembly, to obtain a quasi-solid flexible solar battery. The battery provided in the present invention has good stability and low cost, and is free of electrolyte leakage or encapsulation difficulty, etc., and can be easily stored, transported, installed, and used.

The invention discloses a heterostructure photoanode for a dye-sensitized solar cell, comprising conductive glass and a dye absorption layer coated on the conductive glass. The dye absorption layer is a TiO2-semiconductor heterostructure film, wherein a primary structure is TiO2 nano-fiber or/and TiO2 nano-tubes, and a secondary structure is at least one of semiconductor nano-particles, semiconductor nao-rods and semiconductor nano-wires constructed by semiconductor nano-fiber or/and semiconductor nano-tubes, namely that 1-D heterostructure nano-material as the dye absorption layer of the photoanode of a dye-sensitized solar cell. The combination of the structural characteristics of 1-D nano-size and the polarization property of galvanic couple formed by TiO2/semiconductor composite system interface can enhance the transmission and the separation of electric charges and improve the electronic transmission efficiency; meanwhile, a huge specific surface area can effectively improve the amount of dye absorption and the light utilization efficiency and further improve the photoelectric transformation efficiency of the dye-sensitized solar cell by 10 percent.

The invention discloses an air filtration membrane with functions of killing bacteria and removing formaldehyde. The air filtration membrane is of a three-layer nanofiber membrane composite structure, wherein the upper layer is an activated carbon nanofiber membrane, the middle layer is a pure TiO2 nanofiber membrane, and the lower layer is a nano-silver antibacterial fiber membrane; the pure TiO2 nanofiber membrane is prepared from a high polymer material/TiO2 precursor composite nanofiber membrane through heat treatment, and the high polymer material/TiO2 precursor composite nanofiber membrane is prepared with an electrospinning method; the activated carbon nanofiber membrane is an electrospun activated carbon nanoparticle/high polymer material composite nanofiber membrane; the nano-silver antibacterial fiber membrane is an electrospun nano-silver particle/high polymer material composite nanofiber membrane. The air filtration membrane not only can filter solid particulate pollutants very well, but also is good in breathability, and can remove and decompose formaldehyde in air and filter and kill harmful bacteria in air, thereby guaranteeing health of a respiratory system better.

The invention relates to a catalyst for ultraviolet photocatalytic degradation of organic pollutants and a preparation method thereof. The preparation method comprises the following steps of pouring tetrabutyl titanate, acetic acid, methanol and polyvinylpyrrolidone into a conical flask, stirring to obtain a sol, carrying out electrospinning on the sol to obtain a nanometer fiber membrane and calcining to obtain TiO2 nanofibers; and placing the TiO2 nanofibers in a silver nitrate liquid, stirring and reducing and carrying out UV irradiation to obtain the Ag/TiO2 catalyst. By the preparation method, the problems that narrow energy gap, slow electron transfer speed and high electron-hole recombination velocity of the single TiO2 as a photocatalyst are overcome and the photocatalytic degradation efficiency of the organic pollutants is improved. By preparing the TiO2 nanofiber catalyst through the electrospinning, the light-generated electron-hole recombination velocity is reduced and the transfer rate and the catalytic degradation efficiency are increased. The synthesis method is simple and the reaction conditions are mild. By the catalyst, the ultraviolet photocatalytic degradation efficiency under the condition that methyl orange is used as an organic pollution substrate is high and the photocatalytic degradation effect on the organic pollutants is remarkable especially in the use of neutral conditions.

The invention discloses a preparation method of an alpha-Fe2O3/TiO2 nano-composite gas sensing material. The preparation method comprises the following steps: dispersing FeCl3.6H2O into a mixed solution of deionized water and ammonia water; stirring for 10 to 20 minutes; transferring the obtained mixed solution into a hydrothermal reactor; adding a prepared TiO2 nanofiber material; heating the hydrothermal reactor to be 95 DEG C for reacting for 4 hours; cooling the hydrothermal reactor to a room temperature; centrifuging sediment in the reactor with an ethanol solution repeatedly; drying at the temperature of 55 to 65 DEG C for 24 hours; calcining the material at the temperature of 500 DEG C for 2 hours to obtain the alpha-Fe2O3/TiO2 nano-composite gas sensing material. In the preparation method, the alpha-Fe2O3/TiO2 nano-composite gas sensing material prepared by combination of an electrostatic spinning technology and a hydrothermal method has a one-dimensional dentritic heterostructure, and can show a high gas sensing characteristic.

The invention relates to a preparation method for loading a titanium dioxide (TiO2) nano fiber photocatalyst on a basalt cellucotton substrate. The method comprises the following raw materials: tetrabutyl titanate, polyvinylpyrrolidone (PVPK90), absolute ethyl alcohol, nitric acid and basalt cellucotton. A precursor solution is prepared by adopting tetrabutyl titanate, nitric acid and polyvinylpyrrolidone (PVPK90), PVP/TiO2 composite fibers are precipitated on the basalt cellucotton substrate after being pre-processed by an electrospinning technique, then the basalt cellucotton substrate with the PVP/TiO2 composite fibers is insulated and sintered and then cooled to the room temperature, so that the photocatalyst with TiO2 nano fibers being loaded on the basalt cellucotton substrate is obtained. The method is characterized in that the TiO2 nano fibers with large draw ratio, controllable diameter and large specific surface area is loaded on the basalt cellucotton substrate with large porous surface area, so that the TiO2 photocatalytic efficiency is improved, and the catalyst is easy to recover.

The present invention relates to a preparation method of a TiO2 hollow full mesoporous nanofiber, and belongs to the technical field of nanofiber. The method is as below: dissolving povidone (PVP) and butyl titanate (TBOT) in a solvent, stirring uniformly, then adding a foaming agent, continuing stirring was, and finally adding a surfactant and paraffin oil, and stirring to obtain precursor spinning solution; conducting electrostatic spinning on the precursor spinning solution under high voltage of 15kV-20kV, so as to obtain organic precursor nanofiber; and heating the organic precursor nanofiber in an air atmosphere to 480-500 DEG C at a heating rate of 1-5 DEG C / min, calcining for 1-3 h, and then cooling in the furnace to obtain the TiO2 full mesoporous nanofiber. An appropriate amount of paraffin oil is added and coated in the inside by a continuous phase under the action of static electricity, so as to efficiently synthesize the TiO2 nanofiber with both hollow and full mesoporous structures. The preparation process is simple and controllable.

The invention discloses a method for improving the firmness of combination of a dye-sensitized cell nanometer fibrous membrane and conductive glass. The method comprises the following steps of: (1) spin coating a thin transition layer on the conductive glass before fiber deposition, wherein the thin transition layer is made of spin-coating liquid which has the same elements and higher viscosity compared with a TiO2 precursor spinning solution; (2) adding a proper amount of surfactant triton to the spin-coating liquid and the spinning solution; and (3) processing sintered TiO2 nanometer fibrous membrane with a TiCl4 aqueous solution. Under the synergic action of the three steps above, the firm combination of the TiO2 nanometer fibrous membrane prepared by an electrostatic spinning technology and an FTO (Fluorine-doped Tin Oxide) conductive glass substrate is realized, a key technical problem of application of the electrostatic spinning technology to preparation of a photoanode of a dye-sensitized solar cell is solved, and performances and stability of a deice are improved.

The invention relates to the technical field of solar batteries, in particular to a preparation method of a solid-state sensitized battery. The preparation method comprises a step of preparing TiO2 nanometer fibers, a step of preparing gel ion electrolyte, a step of treating FTO and preparing a photo anode and a step of sensitizing the photo anode, treating the electrolyte and assembling batteries. The preparation method has the beneficial effects that 1, by adopting an electrospinning technology, nanometer fibers with large specific surface area and large length-diameter ratio can be obtained, and the absorption of dyes is facilitated; 2, by adopting an ALD technology for preparing a titanium oxide layer, the collection for battery cells can be improved, and the composition of the electrolyte and the FTO can be obstructed; 3, the sensitized nanometer fibers are directly packaged after being soaked in the gel electrolyte, so that the packaging process is simple.

The present invention discloses a preparation method of a ternary cathode material coated with TiO2 nanofibers of a lithium ion battery and a product. The method comprises the following steps of: 1) employing an electrostatic spinning method to synthesize TiO2 nanofibers; 2) preparing a composite material formed by the ternary cathode material coated with TiO2 nanofibers through high-temperature reaction, wherein the structure general formula is shown as: TiO2@LiNixCoyMnzO2, wherein 0<x<1,0<y<1,0<z<1, and x+y+z=1. The ternary cathode material coated with TiO2 nanofibers can improve the material structure stability and can reduce the side reaction between the electrolyte and the active material so as to effectively improve the cycle performance of the material. The preparation method provided by the invention is effective and rapid, and the ternary cathode material coated with TiO2 nanofibers has a good electrochemical performance.

The invention discloses a preparation method for an N-C-doped TiO<2> nanofiber loaded Pd@Ni positive electrode catalyst for a direct methanol fuel cell. The catalyst comprises the high-conductivity N-C-doped TiO<2> nanofiber and nanometer Pd@Ni with a core-shell structure, wherein the mass content of the N-C-doped TiO<2> nanofiber is 95-97%; the mass content of the nanometer Pd@Ni is 3-5%; and the ratio of n(Pd) to n(Ni) is 1:1. The catalyst provided by the invention has relatively high catalytic oxidation performance; the intermediate products of CO and the like generated by methanol oxidization are absorbed and moved to the surface of the composite catalyst, and are directly and deeply oxidized into a final product-CO<2>; the costs of Ni and Pd are far below than that of noble metals, such as Pt, Ru and the like, and the dosages of Ni and Pd are relatively low in the catalyst; and therefore, the cost of the catalyst is greatly lowered, the catalytic performance and the CO poisoning resistance of the catalyst are greatly improved.

The invention discloses a NaYF4:Yb,Tm/TiO2 composite nanofiber and a preparation method thereof. The preparation method is characterized by comprising the steps that water-soluble NaYF4:Yb,Tm nano-particles are prepared first; then upconversion particles, an alcoholic solution, PVP, acetic acid and TBT are prepared into an electrostatic spinning mixed solution; the mixed solution is used for electrostatic spinning, so that a NaYF4:Yb,Tm/PVP/TBT nanofiber is obtained; at last, the nanofiber is calcined at a specific temperature, and accordingly the NaYF4:Yb,Tm/TiO2 nanofiber can be obtained. According to the NaYF4:Yb,Tm/TiO2 composite nanofiber and the preparation method thereof, the operation steps are simple, the quantity of chemical reagents used in the preparation process is small, production cost is low and mass production and preparation are facilitated.

The invention discloses an In2O3 oriented growth structure, flower-like structure, dendritic structure, hollowed structure and tetrahedral structure along TiO2 nanofiber surfaces and a preparation method. The TiO2 nanofiber is prepared by the hydro-thermal synthesis method. The In2O3 is prepared by the magnetron sputtering technology. The In2O3 oriented growth, flower-like, dendritic, hollowed and tetrahedral structures are multistage and ordered, and are advantaged by high specific surface area, high permeability, good photocatalytic performance and conductivity.

The invention relates to a gas-sensitive element based on TiO2/InVO4 heterostructure nanometer fiber, and applications thereof. The gas sensitive material in the gas-sensitive element is TiO2/InVO4 heterostructure nanometer fiber; in the TiO2/InVO4 heterostructure nanometer fiber, the molar ratio of TiO2 to InVO4 is 0.25-4:1. The gas sensitive material possesses excellent selectivity on ammonia gas; when the temperature is 250 DEG C, and gas concentration is 100ppm, the sensitivity of the gas sensitive material on ammonia gas is 30.5, the response time on ammonia gas is 10s, the recovery timeis 10s. Compared with TiO2 nanometer fiber, the gas sensitivity of the TiO2/InVO4 heterostructure gas sensitive material obtained via InVO4 coupling modification is improved greatly, the response/recovery time is shortened, and the operating temperature is reduced.

The invention discloses a hierarchical-structure MnOx/TiO2 nanofiber catalyst for acetone oxidation and a preparation method of the hierarchical-structure MnOx/TiO2 nanofiber catalyst. The hierarchical-structure MnOx/TiO2 nanofiber catalyst comprises a primary structure and a secondary structure, wherein the primary structure is titanium dioxide nanofiber obtained by virtue of an electrostatic spinning method, and the secondary structure is a manganese oxide nanoneedle obtained by carrying out crystal growth on the primary structure by virtue of a hydrothermal method. According to the preparation method, the MnOx/TiO2 nanofiber catalyst is prepared by virtue of an electrostatic spinning-hydrothermal synthetic method, has relatively large specific surface area and relatively high surface energy, can be applied to catalytic oxidation reaction of VOCs, particularly applied to acetone discharged in industrial exhaust gas and presents good catalytic performance.

The invention discloses a method for improving the performance of a nanofiber membrane of a dye-sensitized battery by synergistic action of carbon nanotubes and titanium tetrachloride. The method comprises the following steps of: 1) doping multi-wall carbon nanotubes in TiO2 precursor spinning solution; and 2) carrying out aftertreatment on a sintered TiO2 nanofiber membrane by using titanium tetrachloride solution. Due to addition of the multi-wall carbon nanotubes, the transmission capability of photoproduction electrons and the strength of the fiber membrane are improved. Due to treatment by the titanium tetrachloride, the absorbing quantity of the membrane for sensitized dyes is increased, the combination of the photoproduction electrons, the oxidation-state dyes and electrolyte is restrained, and the density of the electrons on a TiO2 conduction band is improved. Under the synergistic action of doping of the carbon nanotubes and treatment of the titanium tetrachloride, the performance of the TiO2 nanofiber membrane prepared on the basis of an electrostatic spinning technology is improved, and the total photoelectric conversion efficiency of the dye-sensitized solar battery is improved by 15%-23%.

The invention discloses application of multi-walled carbon nanotube/Ce<3+> doped TiO2 nanometer fibers in catalytic degradation of phenol. The application is characterized in that the molar concentration of the multi-walled carbon nanotube to Ti is 0.15:1, the molar ratio of Ce<3+> to Ti is 0.05%, and the pH value of the catalytic reaction is equal to 4. The multi-walled carbon nanotube/Ce<3+> doped TiO2 nanometer fiber disclosed by the invention has good catalytic performance to phenol in water, and the catalytic efficiency is 99.86%.

The invention discloses an amphiphilic Lindqvist-type polyacid TiO2 composite nanofiber. A preparation method of the nanofiber comprises the following steps: (1) under magnetic stirring, adding a cetyltrimethylammonium bromide water solution into a Na2MoO6.2H2O water solution acidized by hydrochloric acid, heating, filtering, washing with water and diethyl ether, and drying; (2) dissolving butyl titanate and polyvinylpyrrolidone into a mixed solvent of N,N-dimethylformamide, glacial acetic acid and diacetone, and preparing a TiO2 nanofiber by virtue of an electrostatic spinning method; and (3)dispersing the TiO2 nanofiber into ethanol, and stirring, so as to obtain a solution A, dissolving surfactant-packaged Lindqvist-type polyacid into ethanol, stirring to obtain a solution B, slowly dropwise adding the solution B into the solution A, stirring, washing with water and ethanol, and carrying out vacuum drying, so as to obtain the composite nanofiber. The preparation method is simple; the agglomeration problem of polyacid is effectively solved; the composite nanofiber is easy to separate and recycle; and an extraction catalytic oxidation desulfurization system is formed by hydrogenperoxide and ionic liquid [Bmim]PF6, so that the utilization rate of hydrogen peroxide is increased, the desulfurization efficiency is high, and the reusability is good.

The invention discloses a method for removing VOCs (volatile organic chemicals) by low-temperature plasma and electrostatic spinning-photocatalysis technology. The method includes the steps: firstly, preparing nano-fiber photocatalysis materials: manufacturing precursor solution by butyl titanate and acetic acid; preparing polystyrene solution and mixing THF (tetrahydrofuran) and DMF (dimethyl formamide) by 4/6 to form solvents; secondly, adding the precursor solution and cerous nitrate to form spinning solution; sucking the spinning solution into an injector, adjusting the distance between a needle tip and a receiving device and adjusting injection electric field intensity and advance speed to obtain CeO2-TiO2/PS composite fibers; annealing and roasting the composite fibers to obtain CeO2/TiO2 nano-fiber photocatalysis materials; removing the VOCs by the low-temperature plasma-photocatalysis technology. The invention further discloses a corresponding device. The method has the advantages of simplicity in operation, high treatment efficiency, short reaction process, applicability to most polluted gas, suitability for treating low-concentration large-airflow gas and the like.