15 results about "Vanadium doping" patented technology

The invention belongs to the technical field of multiferroic materials, and relates to a design method of a multiferroic body based on a vanadium-doped two-dimensional ferroelectric and the multiferroic body. Performing cell expansion on the single-layer NbOI2 primitive cell in different directions to obtain supercells with different sizes; the method comprises the following steps: doping supercells with different sizes by taking vanadium as a doping element to obtain a doping configuration of each supercell under different doping concentrations; taking the doping configuration with the lowest total energy of the ferromagnetic state and the antiferromagnetic state under each doping concentration as the ground state configuration of the doping concentration; calculating band gaps Eg of ground state configurations with different doping concentrations and spontaneous ferroelectric polarization intensity along a b axis, drawing a double-Y-axis curve graph by taking the doping concentrations as abscissas and the spontaneous ferroelectric polarization intensity and the band gaps Eg as ordinates, and dividing a multiferroic phase region and a magnetic semimetal phase region to obtain a doping concentration-physical property evolution phase diagram; and obtaining a corresponding doping concentration value range when the ground state configuration has a multiferroic phase with ferroelectricity and antiferromagnetism so as to design a multiferroic body.

The application belongs to the technical field of multiferroic materials, and relates to a design method of a multiferroic material based on a vanadium-doped two-dimensional ferroelectric body and the multiferroic material. Single-layer NbOI2 primitive cells are expanded in different directions to obtain supercells of different sizes. Vanadium is used as a doping element to dope the supercells of different sizes, and the doping configurations of each supercell under different doping concentrations are obtained. The doping configuration with the lowest total energy of the ferromagnetic state and the antiferromagnetic state under each doping concentration is used as the ground state configuration of the doping concentration. The band gap Eg and the spontaneous ferroelectric polarization intensity along the b-axis of the ground state configuration under different doping concentrations are calculated. A double-Y-axis curve graph is drawn with the doping concentration as the horizontal coordinate and the spontaneous ferroelectric polarization intensity and the band gap Eg as the vertical coordinate, and the multiferroic phase region and the magnetic semimetal phase region are divided. The doping concentration-physical property evolution phase diagram is obtained, so that the corresponding doping concentration value range of the ground state configuration with the multiferroic phase of ferroelectricity and antiferromagnetism is obtained to design the multiferroic material.

This invention discloses a method for the electrocatalytic reduction of carbon dioxide to solid carbon using gallium-based liquid metal. The method employs a composite working electrode, using a platinum sheet electrode as the counter electrode and an Ag / AgCl electrode as the reference electrode. Solid carbon is prepared through an electrocatalytic reduction reaction in an organic electrolyte continuously purged with carbon dioxide until saturation. The composite working electrode is prepared as follows: using a copper sheet as a substrate, gallium-based liquid metal is treated with dilute hydrochloric acid to remove its surface oxide film, and then capillary action is used to uniformly coat the copper sheet surface. The gallium-based liquid metal is prepared by: mixing gallium, indium, and tin in a specific ratio and heating to obtain a gallium-indium-tin alloy; subsequently, under an inert atmosphere, vanadium powder is ground and mixed with the alloy to achieve uniform vanadium doping, forming more active sites, thereby significantly promoting the generation of solid carbon and effectively improving its Faraday efficiency, thus improving catalytic performance.

A nanocomposite electrode and supercapacitor thereof are disclosed. The nanocomposite electrode includes a substrate, at least one binding compound, at least one carbonaceous compound, and vanadium doped spinel ferrite nanoparticles (V-SFNPs). The V-SFNPs have a formula of CoxNi1-xVyFe2-yOz, wherein x=0.1-0.9, y=0.01-0.10, and z=3-5. The substrate is at least partially coated on a first side with a mixture comprising the V-SFNPs, the at least one binding compound, and the at least one carbonaceous compound. Two of the nanocomposite electrodes are combined to form the supercapacitor.

The application relates to the field of lithium ion batteries, and discloses a titanium dioxide composite negative electrode material, a preparation method of the titanium dioxide composite negative electrode material, a negative electrode sheet and a lithium battery. The negative electrode material comprises nanometer titanium dioxide, a vanadium ion doped titanium dioxide ultrathin layer and a carbon nanotube layer; the nanometer titanium dioxide is a core, is coated by the vanadium ion doped titanium dioxide ultrathin layer, and the carbon nanotube layer coats the vanadium ion doped titanium dioxide ultrathin layer. The application thins the thickness of a contact potential barrier by constructing a vanadium doped ultrathin tunneling layer between nanometer titanium dioxide and a carbon nanotube, the vanadium doped ultrathin tunneling layer matches an interface crystal lattice of the nanometer titanium dioxide layer, and the unique tunneling effect of the vanadium doped ultrathin tunneling layer can accelerate the transfer rate of electrons from the nanometer titanium dioxide to the carbon nanotube, thereby improving the various electrochemical performances of the composite material.

The invention discloses a three-dimensional porous lithium iron manganese phosphate positive electrode material and a preparation method thereof, and belongs to the technical field of lithium batteries. A three-dimensional porous LMFP precursor is prepared through spray granulation and two-stage sintering, bulk phase vanadium doping and surface layer magnesium-niobium gradient co-doping are achieved through a CVD technology, and then a target material is obtained through conducting polymer-fast ion conductor dual coating. The material has high tap density, excellent rate capability and strong manganese dissolution resistance, the process is easy to amplify, and the material is suitable for high-energy-density lithium ion batteries.

The present application relates to the field of electrocatalytic hydrogen evolution, and discloses a preparation method and application of a foam nickel loaded polyacid derivative vanadium doped nickel molybdenum sulfide. The present application aims to solve the problems of raw material shortage, high hydrogen evolution overpotential and high cost in the prior art for synthesizing high-performance electrocatalysts. The present application designs and develops a foam nickel loaded vanadium doped nickel molybdenum sulfide material V-MoS2 / Ni3S2@NF-Mo. The method comprises the following steps: taking Keplerate type polyacid Mo 72 V 30 , thiourea as a sulfur source, and foam nickel as a conductive substrate, and adopting a one-step hydrothermal synthesis method to prepare foam nickel loaded polyacid derivative flower-like vanadium doped nickel molybdenum sulfide, which can be applied to electrocatalytic hydrogen evolution reaction in an alkaline electrolyte and has low hydrogen evolution overpotential and high catalytic activity.

The application discloses a vanadium-doped graphene / molybdenum ditelluride heterojunction-based sulfur hexafluoride decomposition gas sensing chip and system, and relates to the technical field of nanomaterials and smart grid state sensing. The core sensitive material of the sensor is a heterojunction formed by a vanadium-doped graphene layer and molybdenum ditelluride (MoTe2), which can specifically identify and quantify four key decomposition products of sulfur hexafluoride generated under electric heating faults: sulfur dioxide (SO2), hydrogen sulfide (H2S), fluorosulfinyl (SOF2) and fluorosulfonyl (SO2F2). The active sites introduced by vanadium doping and the heterojunction interface synergistic effect significantly improve the gas molecule adsorption and charge transfer efficiency, realizing room temperature high-sensitivity detection of trace decomposition components. Combined with intelligent diagnosis algorithm, the system can accurately identify different fault types such as discharge and overheating inside the equipment according to the type and concentration distribution of the decomposition gas, and issue a graded warning.

The application discloses a preparation method of a vanadium-doped carbon composite back contact layer and application of the vanadium-doped carbon composite back contact layer in preparation of a cadmium telluride solar cell. The method comprises the following steps: firstly, performing a coordination reaction on a vanadium source compound and a carbazole monomer to prepare a vanadium-doped carbazole polymer; secondly, dissolving and coating the polymer on a surface of a cadmium telluride light absorption layer; and thirdly, performing gradient annealing treatment on the polymer to convert the polymer into the vanadium-doped carbon composite back contact layer in situ. During the gradient annealing process, selective rupture of coordination bonds of the polymer is caused, and vanadium ions released from the polymer preferentially diffuse along cadmium telluride grain boundaries to form a local P + Doped region; At the same time, the polymer main chain is carbonized to form a dense conductive network similar to graphene. The prepared back contact layer has high conductivity and high efficient hole transport function, can effectively control the contact potential barrier between the cadmium telluride light absorption layer and the back electrode, and improves the injection and collection efficiency of holes.

The application discloses a preparation method of a vanadium-doped carbon composite back contact layer and application of the vanadium-doped carbon composite back contact layer in preparation of a cadmium telluride solar cell. The method comprises the following steps: firstly, performing a coordination reaction on a vanadium source compound and a carbazole monomer to obtain a vanadium-doped carbazole polymer; secondly, dissolving and coating the polymer on a surface of a cadmium telluride light absorption layer; and thirdly, performing gradient annealing treatment on the polymer to convert the polymer into the vanadium-doped carbon composite back contact layer in situ. During the gradient annealing process, selective rupture of coordination bonds of the polymer is caused, and vanadium ions released from the polymer preferentially diffuse along cadmium telluride grain boundaries to form a local P + Doped region; At the same time, the polymer main chain is carbonized to form a dense conductive network similar to graphene. The prepared back contact layer has high conductivity and high efficient hole transport function, can effectively control the contact potential barrier between the cadmium telluride light absorption layer and the back electrode, and improves the injection and collection efficiency of holes.

An apparatus and a method for producing a photovoltaic solar cell. The apparatus includes a planar silicon base. At least one thin film layer of vanadium (V) doped zinc oxide (ZnO), at least one thin film layer of perovskite precursor solution, or at least one thin film layer of perovskite quantum dots is applied on said silicon base to enhance efficiency and prolong life of the solar cell. A layer of polydimethylsiloxane may be applied to prolong life of the perovskite quantum dots.

The invention specifically discloses a zwitterion-doped nickel-iron layered double hydroxide nano material as well as a preparation method and application thereof, and belongs to the field of electrolysis seawater oxygen evolution catalysis. According to a core part of the catalytic nano material, cation-doped nickel-iron layered double hydroxide is constructed on a foamed nickel substrate in situ from bottom to top, and a vanadium-doped nickel-iron layered double hydroxide nano sheet material grows on the foamed nickel substrate in situ by utilizing a hydrothermal method; the doping of vanadium can effectively adjust the electronic structure of the catalyst, and then a phosphate radical protection layer is constructed on the surface of the catalyst through low-temperature phosphorization, so that the active components of the catalytic material are protected, and the corrosion of harmful chloride ions in seawater to the catalyst is relieved. As a catalyst for seawater electrolysis oxidation, the composite material shows very excellent reaction activity and stability, and has important potential application value in preparation of a transition metal oxygen evolution electro-catalytic material for seawater oxygen evolution reaction.

The invention provides a multi-dimensional disinfection device based on nano-enzyme generated by light particle waves and active oxygen, and relates to the technical field of air purification and disinfection. The device comprises a device shell, an air inlet layer fan, an air outlet layer fan, a photo-promoted active oxygen generation nano enzyme coating film, a light particle wave generator and an ultrasonic generator, wherein the air inlet layer fan is used for sucking air to be disinfected into the device shell; the air outlet layer fan is used for exhausting disinfected air; and the photo-promoted active oxygen generation nano enzyme coating film is arranged on an airflow path between the air inlet layer fan and the air outlet layer fan. TiO2 is modified through vanadium doping, so that the forbidden band width is reduced, and the photo-induced electron-hole separation efficiency is improved; light particle waves directly irradiate the surface of the film, ROS immediately acts on flowing air after being generated in situ, and transmission loss is avoided.

The application belongs to the technical field of catalytic dehydrogenation, and particularly relates to a vanadium-modified dehydrogenation catalyst and a preparation method thereof. The catalyst is composed of M@V-KIT-6, wherein M is a main catalyst, V is an active component regulator, and KIT6 is a carrier. The application provides a catalyst for effectively improving the catalytic efficiency of an active metal and a preparation method thereof. A step-by-step impregnation doping-loading method is used to realize vanadium doping modification of the active metal, so as to effectively control the refinement of the active metal nanocrystalline grains and the improvement of the catalytic dehydrogenation performance. The application not only has a simple and easy-to-operate preparation method, but also has uniformly distributed nanometer palladium particles. The application effectively solves the problems of the current commercial noble metal catalyst, such as low catalytic activity, low selectivity and poor stability, and is suitable for the dehydrogenation application of hydrogen storage materials containing C-H bonds.

This invention belongs to the field of lithium-ion battery technology, and relates to a vanadium-doped lithium iron phosphate cathode material, its preparation method, and its application. The cathode material has the chemical formula LiFePV. x O4, wherein 0.0001≤x≤0.01, is doped with metallic vanadium to replace lithium sites. The cathode material has a D50 of 0.9~2μm and a specific surface area of ​​10-10.5m². 2 / g. The preparation method includes the following steps: (1) Lithium source, iron phosphate, carbon source, vanadium source, surfactant and lithium iron phosphate waste are added to water to prepare a slurry; (2) The slurry is put into a sand mill for sand milling; (3) The sand-milled slurry is spray-dried; (4) The spray-dried powder is sintered; (5) The sintered powder is pulverized by steel mill to obtain lithium iron phosphate cathode material. This invention improves the conductivity of lithium iron phosphate products, reduces battery polarization and improves its rate performance by doping lithium iron phosphate cathode material with vanadium.