38 results about "Nb doped" patented technology

A flow field plate or bipolar plate for a fuel cell that includes a metal oxide coating that makes the bipolar plate conductive, hydrophilic and stable in the fuel cell environment. Non-limiting examples of suitable doped coatings Ta doped TiO2, Nb doped TiO2 and F doped SnO2. In an alternate embodiment, the metal oxide is a non-stoichiometric metal oxide that includes oxygen vacancies in the lattice structure that provides the conductivity. Non-limiting examples of suitable non-stoichiometric metal oxides include TiO2−x and TiO2+y.

The described embodiments provide an energy storage device that includes a positive electrode including a material that stores and releases ion, a negative electrode including Nb-doped TiO2(B), and a non-aqueous electrolyte containing lithium ions. The described embodiments provide a method including the steps of combining at least one titanium compound and at least one niobium compound in ethylene glycol to form a precursor solution, adding water into the precursor solution to induce hydrolysis and condensation reactions, thereby forming a reaction solution, heating the reaction solution to form crystallized particles, collecting the particles, drying the collected particles, and applying a thermal treatment at a temperature >350° C. to the dried particles to obtain Nb-doped TiO2(B) particles.

The invention relates to a preparation method of neodymium-doped titanium base tin dioxide-antimony electrode. The method comprises the following steps: 1) the pretreatment of electrode substrate: polishing, alkaline cleaning and pickling; 2) the preparation of masking liquid: dissolving SnCl4.5H2O, SbCl3 and Nd(NO3)3 according to a ratio of 100:15:1 in solvent to obtain the masking liquid; 3) thepreparation of electrode coating by using immersion method: (1) completely soaking the titanium electrode substrate in the masking liquid for 1min; (2) withdrawing the titanium electrode substrate, blowing away the excessive masking liquid with a blow drier; (3) drying in a baking oven at 100-120 DEG C for 10min to volatilize all the solvent; (4) placing the substrate in a muffle furnace to perform thermal oxidation at 550 DEG C for 15min; (5) cooling to room temperature, dipping again, drying, performing thermal oxidation and repeating the above steps for 15 times to obtain the Nb-doped Ti / Sb-SnO2 electrode. The Nb-doped Ti / Sb-SnO2 electrode prepared by the method of the invention has high oxygen evolution potential, catalytic performance and electricity.

The present invention concerns a core-shell composite material comprising:a core consisting of Nb-doped TiO2 of formula TiNbOx; anda shell consisting of a homogeneous layer of Pt or Pt alloy of 1 to 50 ML in thickness.The core-shell composite material may in particular find application in fuel cells.

The invention relates to an Nb-doped nano indium tin oxide powder and a method for preparing high density sputtering coating target thereof. The method comprising the following steps: (1) dissolving high pure metals: high pure metal niobium, high pure metal indium and high pure metal tin are respectively dissolved into transparent solutions by inorganic acid; (2) mixing: the obtained transparent solutions are respectively filled into containers according to the proportion; (3) chemical precipitation: the three transparent solutions are made into Nb-doped and heavily tin-doped indium hydroxide nano-powder; (4) washing: the Nb-doped and heavily tin-doped tin indium hydroxide nano-powder is washed by de-ionized water and then precipitated; (5) calcinating: the nano-powder is calcined, and the Nb-doped nano indium tin oxide powder is prepared; (6) granulation: the Nb-doped nano indium tin oxide powder is added with a bonding agent and then dried, so that Nb-doped nano indium tin oxide powder before molding can be prepared; (7) molding: the Nb-doped nano indium tin oxide powder before molding is pressed into early embryo; (8) sintering: the early embryo is sintered under the normal pressure, and the high density sputtering coating target of the Nb-doped indium tin oxide can be prepared; in addition, pressure sintering can be adopted to further improve the density of the target.

Multiferroic articles including highly resistive, strongly ferromagnetic strained thin films of BiFe0.5Mn0.5O3 (“BFMO”) on (001) strontium titanate and Nb-doped strontium titanate substrates were prepared. The films were tetragonal with high epitaxial quality and phase purity. The magnetic moment and coercivity values at room temperature were 90 emu / cc (H=3 kOe) and 274 Oe, respectively. The magnetic transition temperature was strongly enhanced up to approximately 600 K, which is approximately 500 K higher than for pure bulk BiMnO3.

A flow field plate or bipolar plate for a fuel cell that includes a metal oxide coating that makes the bipolar plate conductive, hydrophilic and stable in the fuel cell environment. Non-limiting examples of suitable doped coatings Ta doped TiO2, Nb doped TiO2 and F doped SnO2. In an alternate embodiment, the metal oxide is a non-stoichiometric metal oxide that includes oxygen vacancies in the lattice structure that provides the conductivity. Non-limiting examples of suitable non-stoichiometric metal oxides include TiO2-x and TiO2+y.

The invention provides an Nb-doped YBCO (Yttrium Barium Copper Oxide) super-conducting film and a preparation method. The super-conducting film is prepared by mixing a nano-particle BYNO (Ba2YNbO6) with a double perovskite structure into a YBCO film, wherein an Nb material is 1 to 10% of total quantity of a material of a metal cation. The preparation method comprises the following steps of: preparing a YBCO precursor solution; preparing an Nb precursor solution; preparing an Nb-doped YBCO precursor solution; coating same on a gel film; roasting at a low temperature; and sintering at a high temperature. The preparation method provided by the invention is simple and easy to carry out; a mixture ratio of doped materials can be randomly controlled; and furthermore, raw materials are cheap and easy to obtain, vacuum equipment is not needed, and low cost is ensured; a prepared film has higher critical transition temperature, critical current density and an excellent biaxial texture.

The invention discloses a high-toughness Nb doped W / TiC composite material and a preparation method thereof, wherein the high-toughness Nb doped W / TiC composite material comprises the following elements in percentage by mass: 1-3% of Nb, 1% of TiC, and the balance of W; and the preparation method comprises the following steps: W powder, Nb powder and TiC powder are put in a ball milling tank for ball milling 4 hours to obtain a composite powder body; the composite powder body is pressed by the pressure of 300 MPa to obtain a pressed shape; and the pressed shape is put in a high-temperature sintering furnace for sintering to obtain the Nb doped W / TiC composite material. The composite material can effectively improve the toughness of a tungsten-based material.

The present disclosure relates to a method of synthesis of Lithium Titanate Oxide used for a cathode of Lithium ion battery, the method comprising: (A) diluting TiCl4 with TiOCl2; (B) adding YCl3 or NbCl5 at the rate of 0.1˜2 mol % to Ti(mol); (C) forming a complex salt by dissolving to put at least one selected from a group consisting of Hydroxy propyl cellulose or Polyethylene glycol in a solvent, the Hydroxy propyl cellulose being a complexing agent and being a dispersing agent as well, whereas the Polyethylene glycol being a dispersing agent; (D) synthesizing a titanium precursor by adding an aqueous ammonia solution; (E) preparing Y or Nb doped titanium dioxide(TiO2) powder by heat-treating the synthetic product in a temperature of 500˜700° C.; and (F) mixing the Y or Nb doped TiO2 powder with LiOH.H2O and heat-treating the mixture in a temperature of 800˜900° C.

The invention discloses a method for preparing a graphene-Nb-doped TiO<2> nanotube heterostructure photocatalyst. The photocatalyst is responded in a visible light region, and belongs to the technicalfield of photocatalysis. The preparation method comprises the steps: by using isopropanol as a solvent, and tetrabutyl titanate as a precursor, and preparing a supported nano-titanium dioxide catalyst modified on the niobium surface by using a solvothermal method; and then coupling with graphene oxide in an alkaline hydrothermal process to form composite material of the titanium dioxide nanotubemodified on the niobium surface on uniformly supporting reduced graphene sheet, that is the graphene-Nb-doped TiO<2> nanotube heterostructure photocatalyst. In the invention, the photocatalyst, prepared by doping TiO<2>, structuring a tubular structure and the co-modification strategy of composite graphene, has a wide visible light spectral response range, rich surface active sites and high chargeseparation ability. The photocatalytic degradation efficiency reaches 95.2%, which has good industrial application prospects.

A core-shell composite material may include a core consisting of Nb-doped TiO2 of formula TiNbOx; and a shell consisting of a homogeneous layer of Pt or Pt alloy of 1 to 50 ML in thickness. The core-shell composite material may in particular find application in fuel cells.

The invention discloses a Nb-doped Ni-Co-Mn-Li ion battery positive electrode material and a preparation method thereof. The chemical formula of the Nb-doped Ni-Co-Mn-Li ion battery positive electrodematerial is LiaNixCoyMnzNbbO2, wherein 1<=a<=1.2, 0.3<=x<=0.98, 0.01<=y<=0.6, 0.001<=z<=0.6, b=4 / 5-a / 5-3x / 5-3y / 5-3z / 5, and 0.00001<=b<=0.2. According to the Nb-doped Ni-Co-Mn-Li ion battery positiveelectrode material, monocrystalline Co / Mn composite precursor and Nb compound are premixed at ultrahigh speed, the mixture of the monocrystalline Co / Mn composite precursor and the Nb compound are mixed at high speed with common polycrystalline Ni / Co / Mn precursor to improve the mixed effects; due to the high mechanical strength, the crystalline composite precursor can be mixed at ultrahigh speed and avoid being shattered; meanwhile, the monocrystalline composite precursor can play the role of collision medium to fully scatter the Nb compound and accordingly to fully mix doping elements with major elements.

The invention relates to the field of a ternary laminated ceramic titanium silicon carbon material, in particular to a method for improving high-temperature mechanical property and high-temperature oxidation resistance of titanium silicon carbon. The method improves high-temperature mechanical property and high-temperature oxidation resistance by preparing titanium silicon carbon material containing Nb solid solute produced by in situ reaction, wherein the titanium silicon carbon is a ternary laminated ceramic Ti3SiC2 or Ti3(SiAl)C2 containing solid solute Al; the titanium silicon carbon containing Nb solid solute is prepared by containing solid solutie Nb on Ti positions. 0-10at.% of solid solute Nb exists on the Ti position so as to form (Ti1-xNbx)3SiC2 or (Ti1-xNbx)3(SiAl)C2 solid solution material, wherein x is 0-0.1. is the experimental results show that compared with the titanium silicon carbon material, the maintaining temperature of the high-temperature strength of the Nb-doped titanium silicon carbon solid solution material is improved by about 150 DEG C; the oxidation kinetics of the solid solution material at 1000-1300 DEG C follows a parabola rule; under a same oxidization condition, the oxidization rate constant is reduced to 1-2 orders of magnitude, so that the using temperature range of the titanium silicon carbon material is enlarged.

The invention relates to a preparation method of a lithium-rich manganese-based positive electrode material. The preparation method comprises the following steps of: (1) dissolving a niobium carboxylic acid derivative in deionized water to prepare a solution with the pH value of 1-3; (2) mixing a lithium-rich manganese-based material with the solution of the niobium carboxylic acid derivative formixing, and stirring and heating the mixture to a temperature of 55-80 DEG C, preferably 60-65 DEG C to form a suspension; (3) adding a lithium source, a complexing agent and a dispersing agent according to a molar ratio of 1:1-3:0.01-0.5 into the suspension, performing heating at a temperature of 60-100 DEG C for 10h to form a lithium-rich manganese-based material coated with a Li-Nb precursor; and (4) performing calcination of the lithium-rich manganese-based material coated with the Li-Nb precursor at a temperature of 500-900 DEG C for 5-15h to obtain a manganese-based positive electrode material. The method employs the mild acidity of the solution of the niobium carboxylic acid derivative to construct Li+ / H+ structure defects at the surface of the lithium-rich manganese-based material,and performs addition of the lithium source and the high-temperature solid-phase reaction to construct an Nb-doped / LiNbO3-coated dual-shell surface reconstruction layer so as to obviously improve theelectrochemical performance of the lithium-rich manganese-based material.

The invention provides a method for improving Fe-Se superconducting transition temperature by Nb doping. The method includes: mixing iron powder and selenium powder in an agate mortar, and performingfull grinding to obtain uniform mixed powder; then pressing the ground powder into tablets and conducting vacuum sealing in a quartz tube; putting the well sealed quartz tube into a tubular sinteringfurnace, and conducting sintering by one-step sintering process to obtain an FeSe block material, and then performing grinding into powder in a mortar; subjecting pure Nb powder and the FeSe powder obtained in step one to grinding and mixing according to an atomic percentage ratio of x:1, x=0.02-0.08, thus obtaining mixed powder; and subjecting the mixed powder obtained in the second step to tabletting, placing the product in a tubular furnace, conducting vacuum pumping, and introducing high purity argon into the tube for secondary sintering, and then carrying out furnace cooling so as to obtain an Nb-doped FeSe superconducting block. Nb doping can increase the superconducting transition temperature of FeSe to 13.6K.

The invention relates to a rapid response wide frequency channel laser detector made of oxide heterogeneous junction material, comprising: a strontium titanic niobate-doped substrate and a lanthanum manganate-doped film layer epitaxially grown on the substrate, thus forming a Nb doped -lanthanum manganate doped oxide heterogeneous junction; or expitaxially growing an insulating layer on the strontium titanic niobate-doped mono-crystalline substrate, and expitaxially growing a lanthanum manganate- doped film on the insulating layer, thus forming a strontium titanic niobate doped-insulating layer-lanthanum manganate doped oxide heterogeneous junction; the first electrode is arranged on the lanthanum manganate-doped film, the second electrode is arranged on the substrate, and the two electrodes are connected with one end of an electrode lead each, and one end of one electrode lead and one end of the other electrode compose a signal output end. As the light irradiates the laser detector, it directly generates a voltage signal without any auxiliary power supply and electronic circuit. Its response waveband ranges from ultraviolet to far infrared, able to respond to fly-second wide laser pulse, and the voltage pulse generated by the laser pulse has front edge less than 1.5ns, half width less than 2ns and full width equal to only several ns.

The invention discloses Mg-Nb doped bismuth titanate microwave dielectric ceramic. The chemical formula of the Mg-Nb doped bismuth titanate microwave dielectric ceramic is MgxBi[4-x]Ti[3-x]NbxO12, wherein x ranges from 0.1 to 0.4. A preparation method comprises the steps that the raw materials of Bi2O3, TiO2, (MgCO3)4.Mg(OH)2.5H2O and Nb2O5 are mixed according to the stoichiometric ratio of MgxBi[4-x]Ti[3-x]NbxO12 of which the x ranges from 0.1 to 0.4 and ball-milled for 6 h, drying is conducted at 90 DEG C, and grinding and sieving are conducted; synthesis is conducted at 800 DEG C, secondary ball milling is conducted for 12 h, drying, grinding and sieving are conducted, 7 wt% of polyvinyl alcohol water solution is additionally added for granulation, compression column homogenization is conducted, mashing, grinding and sieving are conducted, and compression molding is conducted to form a green body, the green body is subjected to heat preservation for 1 h at 650 DEG C, and organic matter eliminating is conducted; sintering is conducted at 1,000 DEG C to 1,100 DEG C, and the Mg-Nb doped bismuth titanate microwave dielectric ceramic is obtained. According to the Mg-Nb doped bismuth titanate microwave dielectric ceramic and the preparation method thereof, the Mg-Nb doped bismuth titanate microwave dielectric ceramic with a high dielectric constant is obtained at low sintering temperature, dielectric loss of bismuth titanate is reduced, the product performance is improved, the best sintering temperature is 1,050 DEG C, epsilon r equals to 125, and Q*f equals to 632 GHz.

The invention provides a photocatalytic reagent which has the chemical composition of any one of TiO2, La-doped TiO2, Nb-doped TiO2 and Bi-doped TiO2. The invention also discloses equipment applying the photocatalytic reagent on aluminized paper. A waste gas outlet is formed in a photocatalytic reactor; ultraviolet lamp tubes are arranged on the inner side wall of the photocatalytic reactor on two sides of the waste gas outlet; a rotatable rod is arranged at a position, which is 3-8cm away from the ultraviolet lamp tubes; multiple hot air inlets are formed in the bottom of the photocatalytic reactor; and aluminized paper belt roller shafts are arranged on two sides of the photocatalytic reactor. The experiment proves that the degradation rate of formaldehyde and TVOC is increased along with the prolonged illumination time, the concentration of the formaldehyde is reduced along with the prolonged illumination time, the degradation rate of the formaldehyde and TVOC is not influenced by the coating thickness of the photocatalytic reagent, the photocatalytic reagent has repeatability on degradation, and the degradation rate of the photocatalytic reagent on the formaldehyde is not less than 85 percent.

The invention discloses an Nb-doped YxYb1-xBCO superconductive film and a preparation method thereof, and belongs to the technical field of YBCO superconductive film modification. The method which allows Nb to be doped in a YxYb1-xBCO film comprises the following steps: 1, preparing a YBCO precursor solution; 2, preparing a Yb precursor solution; 3, preparing a YxYb1-xBCO precursor solution; 4, preparing an Nb precursor solution; 5, preparing an Nb-doped YxYb1-xBCO precursor solution; 6, coating a gel film; 7, sintering at a low temperature; and 8, sintering at a high temperature. The method has the advantages of simplicity, easy implementation, discretionary control of the proportion of a dopant, cheap and easily available raw materials, no need of vacuum equipment, and low cost, and the prepared film has a high phase purity, a high critical transition temperature and a good surface.

The invention discloses an electronic skin and a preparation method thereof. The electronic skin includes a mica substrate, a 50% Nb-doped BaTiO3 semiconductor thin film layer covering the mica substrate, and a platinum electrode covering the semiconductor thin film layer, the thickness of the mica substrate is 0.02-20 [mu]m, the thickness of the semiconductor thin film layer is 5-200 nm, and thethickness of the metal electrode is 5-200 nm. The electronic skin can sense temperature, stress, deformation and light, has the advantages of flexible, low weight, low thickness, low power consumption, highly sensitive stress induction, low-temperature and organic solvent resistance and the like, and further has the characteristics of good low-temperature and flexural fatigue resistance; and the preparation process of electronic skin is simple, a mature coating process can be compatible with a semiconductor process, photoetching and ion etching can be realized, thus the efficiency is higher, device miniaturization and integration are more convenient, and industrialized promotion is easy.

The invention discloses a preparation method for an Nb-doped Li4T5O12 nano material. The preparation method comprises the following steps of a, adding ethanol into backflow equipment; b, adding compounds of lithium chloride, niobium chloride and titanium in sequence into a solvent in the equipment, constructing the equipment, stirring until a solution is clarified, and then continuing to stir the solution; c, heating the solution in the step b firstly until backflow is started, then adjusting the temperature for backflow to 24-36 hours, ending the backflow after gel is formed, and taking out the gel after the gel is cooled; d, drying the gel under the temperature of 200-250 DEG C, and removing the solvent to obtain an Nb-doped lithium titanate precursor; and e, calcining the Nb-doped lithium titanate precursor obtained in the step d under the temperature of 650-750 DEG C to obtain the Nb-doped Li4T5O12 negative electrode material. The raw materials and the technology of the preparation method are simple; the particle size of the obtained product is small, and the dispersivity is high; the Nb-doped Li4T5O12 nano material is relatively high in specific charge and discharge capacity and relatively stable in cycle performance.

The invention discloses an inorganic perovskite light-absorbing material (La<1-a-b-c-d>YDyBi<c>Er<d>)M<0.5>Mn<0.5>O<3> and a preparation method thereof. The preparation method comprises the following steps: preparing a precursor solution; (2) preparing sol-gel; (3) coating a bottom electrode with the sol-gel, placing the bottom electrode into a drying oven at the temperature of 90 to 110 DEG C for drying, and keeping the temperature at 600 to 1,000 DEG C for thermal treatment; and (4) preparing an indium-doped zinc oxide electrode on an upper surface of deposited sol-gel. Through adoption of the preparation method, the (La<1-a-b-c-d>YDyBi<c>Er<d>)M<0.5>Mn<0.5>O<3> is prepared by a sol-gel method, and a highly-stable lead-free perovskite solar light-absorbing material layer of which a band gap width is adjustable between 1.3eV and 2.2eV is prepared on a Nb-doped SrTiO<3> substrate. Short-circuit current is between 5 and 7.55mA / cm<2>, and an open-circuit voltage is between 0.24 to 0.55V. The material has the characteristics of simple preparation process, high chemical stability, freeness from environmental pollution elements, and band gap width being adjustable in a relatively large range; the power conversion efficiency can be approximate to 8 percent; and other photovoltaic absorbing layer materials are effectively supplemented and adjusted.

The invention discloses a preparation method of a Nb-doped titanium-oxide nano spindle body. The preparation method comprises: butyl titanate is added into a glacial acetic acid solution, stirring iscarried out, niobium(5+) ethanolate is added into the solution based on a doping ratio of a molar ratio of Nb / (Nb+Ti)0%--20%, stirring is carried out continuously to obtain a clear precursor solution;the solution is poured into a stainless sodium reaction vessel with a polytetrafluoroethylene lining, reaction is made, natural cooling is carried out until a room temperature is reached, so that a white or blue precipitate is obtained; and all precipitates are cleaned repeatedly by using deionized water and ethanol to obtain a Nb-doped titanium-oxide nano spindle body. In addition, the inventionalso discloses a Nb-doped titanium-oxide nano spindle body and application thereof. According to the invention, the preparation method is simple; the cost is low; particle size uniformity is high; and the high crystallization effect is good. Meanwhile, a flat-plate battery obtained by using the Nb-doped titanium dioxide spinning body as an electron transport material has the high efficiency, small hysteresis and high stability.

The invention belongs to the field of preparation of materials for solar cells, and particularly relates to a photo-anode of a dye-sensitized solar cell and a preparation method of the photo-anode. The photo-anode comprises a transparent conductive glass substrate and a physically doped nano TiO2 thin film on the transparent conductive glass substrate, wherein the doped material is Nb-doped SrTiO3; and the thickness of the thin film is 1-7 microns. Electron-hole separation is assisted in the photo-anode by using high conductivity and a thermoelectric effect of the Nb-doped SrTiO3, so that the electron transmission efficiency of the photo-anode is improved, and the photo-anode has the properties of high current density and high photoelectric conversion efficiency.

The invention relates to a rapid response wide frequency channel laser detector made of oxide heterogeneous junction material, comprising: a strontium titanic niobate-doped substrate and a lanthanum manganate-doped film layer epitaxially grown on the substrate, thus forming a Nb doped -lanthanum manganate doped oxide heterogeneous junction; or expitaxially growing an insulating layer on the strontium titanic niobate-doped mono-crystalline substrate, and expitaxially growing a lanthanum manganate- doped film on the insulating layer, thus forming a strontium titanic niobate doped-insulating layer-lanthanum manganate doped oxide heterogeneous junction; the first electrode is arranged on the lanthanum manganate-doped film, the second electrode is arranged on the substrate, and the two electrodes are connected with one end of an electrode lead each, and one end of one electrode lead and one end of the other electrode compose a signal output end. As the light irradiates the laser detector, it directly generates a voltage signal without any auxiliary power supply and electronic circuit. Its response waveband ranges from ultraviolet to far infrared, able to respond to fly-second wide laser pulse, and the voltage pulse generated by the laser pulse has front edge less than 1.5ns, half width less than 2ns and full width equal to only several ns.

The invention discloses a high-toughness Nb doped W / TiC composite material and a preparation method thereof, wherein the high-toughness Nb doped W / TiC composite material comprises the following elements in percentage by mass: 1-3% of Nb, 1% of TiC, and the balance of W; and the preparation method comprises the following steps: W powder, Nb powder and TiC powder are put in a ball milling tank for ball milling 4 hours to obtain a composite powder body; the composite powder body is pressed by the pressure of 300 MPa to obtain a pressed shape; and the pressed shape is put in a high-temperature sintering furnace for sintering to obtain the Nb doped W / TiC composite material. The composite material can effectively improve the toughness of a tungsten-based material.

The present disclosure relates to a method of synthesis of Lithium Titanate Oxide used for a cathode of Lithium ion battery, the method comprising: (A) diluting TiCl4 with TiOCl2; (B) adding YCl3 or NbCl5 at the rate of 0.1˜2 mol % to Ti(mol); (C) forming a complex salt by dissolving to put at least one selected from a group consisting of Hydroxy propyl cellulose or Polyethylene glycol in a solvent, the Hydroxy propyl cellulose being a complexing agent and being a dispersing agent as well, whereas the Polyethylene glycol being a dispersing agent; (D) synthesizing a titanium precursor by adding an aqueous ammonia solution; (E) preparing Y or Nb doped titanium dioxide(TiO2) powder by heat-treating the synthetic product in a temperature of 500˜700° C.; and (F) mixing the Y or Nb doped TiO2 powder with LiOH.H2O and heat-treating the mixture in a temperature of 800˜900° C.