30results about How to "Play a doping role" patented technology

The invention relates to a Li-Zn ferrite material. The Li-Zn ferrite material comprises ferrite magnetic powder and an inorganic binder and is prepared through grinding and stirring, cold press forming and high temperature sintering. The Li-Zn ferrite material is characterized in that the ferrite magnetic powder is Li<2-0.5x>ZnxFe<2-0.5x>O4, x is 1, 2 or 3, and the inorganic binder is silica sol. The Li-Zn ferrite material has the advantages that 1) by adding a silane coupling agent, particle agglomeration can be effectively reduced, the dispersibility and flowability of the powder can be improved, and the forming density and uniformity of the Li-Zn ferrite can be improved; 2) the Li-Zn ferrite has good high-frequency soft magnetic properties and relatively low sintering temperature; 3) silica sol is adopted as the inorganic binder and silicon can play a role of doping in the high temperature sintering process, thus improving the magnetic properties and microstructure of the Li-Zn ferrite.

The invention relates to a doped BaSO 4 Anode material for sodium ion battery and preparation method thereof, comprising the following steps: (1) one-step hydrothermal method for preparing SnO 2 Material; (2) SnO 2 The material was dissolved in deionized water, dilute sulfuric acid solution and Ba(OH) 2 solution, to achieve BaSO 4 Doped SnO 2 Composite material; (3) ZnS / C composite material prepared by carbothermal reduction method: take zinc salt and sulfur source as raw materials and dissolve them in deionized water, and obtain a ZnS material precursor after the reaction, then dissolve the precursor in deionized water, add Organic carbon source, stir until the water evaporates completely, then place in an inert atmosphere and roast; (4) BaSO 4 Doped SnO 2 The composite material and the ZnS / C composite material are mixed in proportion. The doping BaSO that the inventive method makes 4 The prepared electrode material can meet the performance requirements of the negative electrode material of the sodium ion battery, and has a high initial capacity, a good specific capacity, a high first Coulombic efficiency and ideal cycle stability, making the sodium ion battery in the energy storage system status has been elevated.

The invention discloses a flexible cadmium telluride solar cell with a graphene insertion layer. With nickel foil as a substrate and graphene as the insertion layer, the nickel foil and the graphene are arranged on the substrate; and a doped layer and a barrier layer are fabricated behind the insertion layer to form a back contact layer of the flexible cadmium telluride solar cell. Meanwhile, a ZnO-based transparent conductive composite thin film is adopted by a front contact layer; and a copper-free structural design and a copper-free technological treatment process are adopted by the solar cell, so that the photoelectric conversion efficiency of the flexible solar cell can be greatly improved; the long-term stability of a device is improved; and the structural design of the device and the selection of the back contact layer are well compatible to the technological process. In addition, due to the self-support characteristics of the graphene insertion layer, the graphene can be stripped from the metal substrate as an independent transparent cell, and can also be transplanted to a bottom cell to fabricate an efficient laminated cell.

The invention relates to a method for preparing MnZn ferrite. The method comprises the following steps of: carrying out reflux conversion by using ammonium bicarbonate and ammoniacal liquor as precipitating agents, carrying out coating modification by compounding silane and a titanate coupling agent before moulding to prepare an MnZn ferrite nanometer powder with a monoatomic coating, utilizing good reactivity between hydrolysable groups of a coupling agent and the surface of the nanometer powder; adding an organic binder; allowing other atoms in the coupling agent to form a gas and volatilize during the subsequent sintering process with Si<4+> and Ti<4+> left in MnZn ferrite, and raising grain boundary resistance at enriched crystal boundary so as to reduce loss, conduct the doping function and raise magnetic properties of the product. By the adoption of the method, microstructure of MnZn ferrite is improved; density and magnetic properties of MnZn ferrite are raised; density of a sintered body reaches 5.03 g / cm<3>; saturated magnetic induction density Ms, remanent magnetization Mr and coercive force Hc are respectively 102.8 emu / g, 6.3 emu / g and 20.5 Oe; and saturation magnetic flux density Bs reaches 416 mT.

The invention provides a polythiophene nanometer conductive composite material and a preparation method of the polythiophene nanometer conductive composite material based on the advantages of attapulgite of special crystal structure, physico-chemical property and low price, solving the shortcoming in the prior art that the polythiophene-inorganic nanometer composite material is high in cost. The polythiophene nanometer conductive composite material is an iodine-doped porous rod shaped silica / polythiophene amorphous conductive composite material. The preparation method of the polythiophene nanometer conductive composite material comprises the following steps in sequence: dissolving a thiophene monomer into an organic solvent I; adding purified nano attapulgite and an oxidant to an organic solvent II; dropping the mixture to the thiophene solution in an one-by-one way so as to prepare the thiophene / polythiophene nano composite material; and placing the prepared thiophene / polythiophene nano composite material into the iodine vapor to prepare into the porous rod shaped silica / polythiophene amorphous conductive composite material.

The invention relates to a preparation method of a graphene coating conductive fiber. The preparation method comprises the steps that graphene oxide is assembled on a fiber by electrostatic interaction, and then subjected to reduction treatment to obtain the graphene coating conductive fiber, wherein the assembly is achieved by immersing the fiber with charges on the surface in a graphene oxide dispersion at a temperature of 10 to 30 DEG C for one or more times, the graphene oxide in the adjacent two immersed graphene oxide dispersions is oppositely charged each time, the soaking time is 5 to10 min each time, and post-treatment is conducted after each soaking; multiple soaking is 2 to 8 times; the conductivity of the obtained graphene coating conductive fiber is 10 to 1.5 multiply 10<3>S / m, and the conductivity remains above 95% or more after washing for 100 times. The preparation method is simple, the fiber coating efficiency is effectively improved by an electrostatic assembly method, the used coating layer is all graphene, the electrical conductivity and water washing performance of the fiber are significantly improved, and the preparation method of the graphene coating conductive fiber has a great application prospect.

The invention discloses a preparation method of a rectangular multicore composite superconductive strip. The preparation method comprises the following steps of step one. preparing mixed slurry by using amorphous boron powder, magnesium powder and a malic acid ethanol solution; step two. preparing tubing precursor powder; step three. tubing, carrying out rotary swaging, and drawing, thus obtaining a Cu-Nb-MgB2 single-core rod; step four. placing the Cu-Nb-MgB2 single-core rod and a Cu-NbTi single-core rod in a Cu-Ni alloy tube for secondary packaging, thus obtaining a secondary complex; five. processing the secondary complex into a wire rod, then carrying out rotary swaging and drawing so as to obtain a rectangular multicore composite strip; step six. winding a high-silica glass fiber to form a disk, and clamping the two ends of the disk to be flat; and step seven. carrying out thermal treatment so as to obtain the rectangular multicore composite superconductive strip. Compared with a single MgB2 and NbTi superconducting material, the composite superconductive strip prepared by the method is relatively wide in temperature using range and has relatively high using magnetic field.

The present invention relates to a porous silica / ZSM-5 molecule sieve catalyst preparation method, and belongs to the technical field of shape selecting catalysis. The preparation method comprises: dispersing a ZSM-5 molecule sieve in ethanol, adding purified nanometer attapulgite to a hydrophilic organic solvent, slowly adding the obtained mixed solution to the ZSM-5 molecule sieve ethanol dispersion to prepare an attapulgite / ZSM-5 molecule sieve, and placing the prepared attapulgite / ZSM-5 molecule sieve in iodine vapor to prepare the porous silica / ZSM-5 molecule sieve catalyst. According to the present invention, the attapulgite / ZSM-5 molecule sieve is placed in the iodine vapor so as to provide a doping effect, such that the attapulgite can be converted into porous silica, the number of acid active sites on the outer surface of the ZSM-5 molecule sieve is reduced, isomerization reactions of p-xylene on the outer surface of the molecule sieve is effectively reduced, and selectivity on p-xylene is further increased.

The invention relates to a ZnS / C-SnO negative electrode material for sodium ion batteries prepared by utilizing tin mud 2 The method comprises: S1: washing and drying the tin sludge to obtain SnO 2 Materials; S2: Preparation of ZnS / C composite materials by one-step hydrothermal method: hydrothermal reaction is carried out with zinc salt, sulfur source and organic carbon source as raw materials, after the reaction is completed, the precipitation is collected and dried to obtain a composite material precursor, and the composite material The precursor is placed in an inert atmosphere and roasted to obtain a ZnS / C composite material; S3: the SnO prepared in step S1 2 The material is mixed in proportion with the ZnS / C composite material prepared in step S2 to obtain the negative electrode material ZnS / C-SnO for sodium ion battery 2 . The present invention solves the problem that the tin sludge produced in the tinning process has not been properly recycled and reused, and uses the tin sludge to prepare the negative electrode material of the sodium ion battery, which solves the problem of SnO 2 The problem of high cost effectively reduces the cost of raw materials, which is more in line with the concept of low cost of sodium-ion batteries and realizes the comprehensive utilization of resources.

The invention relates to a method for preparing MnZn ferrite with adding a silane coupling agent. The method comprises the following steps: 1, adding ferrite nanopowder to the silane coupling agent, and mixing with stirring, wherein the chemical formula of the ferrite nanopowder is Mn1-xZnxFe2O4, and x is equal to or more than 0.34 and equal to or less than 0.62; 2, adding an organic binder to the powder obtained in step 1, putting to a mortar, and uniformly mixing to obtain powder; 3, preparing an annular biscuit by carrying out dry press molding on the powder obtained in step 2 at 200MPa; and 4, and sintering to obtain products. According to the invention, the microstructure of the MnZn ferrite is improved, the density and the magnetic property of the MnZn ferrite are improved, the density of a sintered body (the MnZn ferrite) is 4.83g / cm<3>, the saturated magnetic induction intension Ms of the sintered body is 92.18emu / g, and the residual magnetization Mr of the sintered body is 10.68emu / g, and the coercive force Hc is 60.650e; in addition, a doping link in the molding process is omitted, so the molding process is simplified, and resources are saved.

In order to process a silicon wafer for a solar cell (11), an anti-reflective coating (15) on an active silicon layer (13) can be provided with trenches (22), for example by means of a laser (20a). The possibility of damage to the upper face (14) of the active layer (13) by the laser (20a) can be avoided by introducing a contact and doping material (30) into the trench (22). This material contains nickel for the contact function and phosphorus for the doping function. Heating of the contact and doping material (30), for example by means of a second laser (20b), results in doping of the adjacent area (25) of the active layer (13). This can thus be repaired and, in addition, a very low contact resistance can be produced to the finished contact (30').

The invention relates to a preparation method of a Li-Zn soft magnetic ferrite with high frequency and high resistivity. The preparation method comprises the following steps of firstly preparing dispersion mixed liquid by adding zinc sulfate and lithium acetate to a ferrous sulfate solution and then carrying out hydrothermal crystallization reaction in a high pressure reactor, thus preparing mixed powder; finally grinding and stirring the prepared mixed powder and silica sol, carrying out cold press forming on the powder, and roasting and sintering the product, thus preparing the Li-Zn soft magnetic ferrite. The Li-Zn soft magnetic ferrite has the advantages that 1) by adding a silane coupling agent, particle agglomeration can be effectively reduced, the dispersibility and flowability of the powder can be improved, and the forming density and uniformity of the Li-Zn ferrite can be improved; 2) the Li-Zn ferrite has good high-frequency soft magnetic properties and relatively low sintering temperature; 3) silica sol is adopted as the inorganic binder and silicon can play a role of doping in the high temperature sintering process, thus improving the magnetic properties and microstructure of the Li-Zn ferrite.

The invention discloses an amorphous metal powder catalyst for decomposition of water into hydrogen and a preparation method of the amorphous metal powder catalyst. The preparation method comprises the steps that 1, a hydrotalcite-like compound, a molybdenum-containing compound and a tungsten-containing compound are weighed according to the metal ion molar ratio of 1:1:(0.01-1) and mixed to obtain mixed powder; 2, 35-60 L of mixed solution is weighed for use on the basis of every 1 mol of metal ions in the hydrotalcite-like compound; 3, the mixed powder is added into the mixed solution to be evenly mixed, reflux heating is carried out at the temperature of 150-200 DEG C, a stirring reaction is carried out for 20-30 h, and a sediment is obtained; 4, the sediment is heated and dried at the temperature of 120-150 DEG C for 3-5 h after being cleaned, and then is roasted at the temperature of 300-400 DEG C for 2-4 h, and a catalyst precursor is obtained; and 5, the catalyst precursor is subjected to heat preservation at the temperature of 600-700 DEG C for 1.5-10 h, and then naturally cooled to indoor temperature.

The invention provides a preparation method of polyaniline nanotubes. The preparation method comprises the steps of: firstly, taking rodlike silicate clay as a nuclear body, conducting surface initiated polymerization to coat polyacrylic acid, and then conducting oxidative polymerization to coat polyaniline, thereby preparing silicate clay / polyaniline composite; and finally dissolving the rodlike silicate clay with hydrofluoric acid, and then conducting duel-doping to polyaniline to obtain conductive polyaniline nanotubes. Polyacrylic acid coated on the surface of the silicate clay has two aspects of advantages that the surface activity of the silicate clay is increased and polyaniline can be easily adsorbed on the surface; polyacrylic acid can play a role in doping polyaniline, so that an acid is not needed to be additionally added into a polyaniline synthesis system; the hydrofluoric acid applied not only can remove a silicate clay template to produce the polyaniline nanotubes, but also can further improve the conductivity of the polyaniline nanotubes; the silicate clay selected as the template has the advantages of no need of painstakingly conducting artificial synthesis, low cost and the like; and the production cost can be further lowered.