8 results about "Bismuth doping" patented technology

The application belongs to the technical field of electrochemistry, and provides a preparation method of a bismuth-doped porous hollow nanosphere electrode and application of the electrode in electro-reduction of CO2 to produce formic acid. The bismuth-doped porous hollow nanosphere electrode is used as a cathode, and a platinum sheet electrode is used as an anode to electrocatalytically reduce carbon dioxide, and the method is characterized in that carbon dioxide can be efficiently reduced to produce formic acid under mild conditions. The electrochemical reduction method has the advantages of simple process flow, convenient operation, mild reaction conditions, high formic acid yield, stable effect, and the like. The bismuth-doped porous hollow nanosphere electrode has the advantages of good CO2 reduction performance, high formic acid current efficiency, high formic acid yield, long service life, easy processing, low cost, and the like.

This invention provides a method for protecting the surface of aluminum alloys, aluminum alloy workpieces, and their applications, relating to the fields of aluminum alloy surface modification and laser protection technology. The method includes: preparation of microstructures on the aluminum alloy surface, anodic oxidation growth array, electrochemical deposition of ultraviolet absorbing particles, and sealing treatment. The dual three-dimensional structure formed by the microstructure substrate and the anodic oxidation array increases the laser contact area and extends the laser reflection path. The bismuth-doped tin oxide composite absorbing particles achieve highly efficient absorption of ultraviolet laser light, with absorption rates exceeding 95%, and significant stray light suppression.

The application discloses a bismuth-nickel-iron composite oxide catalyst, a preparation method and application. A bismuth source, a nickel source and an iron source are dissolved in a mixed solvent of ethanol and ethylene glycol, and then are fully stirred to obtain a mixed solution; oil amine and urea are added into the mixed solution, and after ultrasonic mixing, the mixture is moved to a polytetrafluoroethylene reaction kettle for a solvothermal reaction; after the reaction solution is cooled, the product is washed, dried and calcined, and finally the bismuth-nickel-iron composite oxide catalyst is obtained. The application prepares a spinel nanometer catalyst with stable performance, the NO removal rate of which reaches 90% at 175 DEG C, the denitration efficiency of which is as high as 100% at 225 DEG C, the medium-low temperature denitration performance of which is excellent, and the catalyst has the characteristics of high CO-SCR denitration efficiency and magnetic recyclability. In addition, proper bismuth doping is beneficial to improving the sulfur resistance of the nickel-iron catalyst, and thus the catalyst has a wide application prospect.

This invention belongs to the field of inorganic luminescent materials technology, and provides a highly thermally stable blue-green germanate phosphor, its preparation method, and its applications. The chemical composition formula of this blue-green germanate phosphor is: Ba 1.98 MgGe2O7:0.01Bi 3+ The preparation method includes: (1) weighing the raw material powder separately; (2) grinding and pouring it into an alumina crucible; (3) sintering the alumina crucible containing the mixture. This phosphor uses the traditional high-temperature solid-state method to synthesize a new bismuth-doped germanate phosphor matrix in an atmospheric pressure air atmosphere. Not only is the synthesis method simple, but the prepared sample has no overlap between the excitation spectrum and the emission spectrum under the premise of wide absorption in the ultraviolet region, which can effectively avoid the phenomenon of spectral reabsorption. It can supplement the missing blue-green light region in white LEDs and match well with existing commercial 365nm near-ultraviolet LED chips. It can solve the problem that most phosphor systems cannot maintain excellent luminescence performance in high-temperature environments above 200℃.

The invention provides a composite coating based on a bismuth-doped selenate refrigeration material as well as a preparation method and application, aims to solve the problems that an existing passive radiation refrigeration material lacks regulation and control in a static state and is difficult to self-adapt, and belongs to the technical field of functional materials and building energy conservation. The chemical composition of the refrigeration material comprises four elements of Sr, Bi, Se and O. The refrigeration material has the photochromic characteristic, and under the action of strong ultraviolet radiation, the body color reversibly changes from white to pink purple; the refrigeration material is prepared by taking SrCO3, SeO2 and Bi2O3 as raw materials and carrying out high-temperature solid-phase reaction; wherein the molar ratio of Sr to Se to Bi in the raw materials is (0.4-0.6): 1: (0.001-0.01); the high-temperature solid-phase reaction comprises the step of heating the mixed raw materials to 900-1000 DEG C in an air atmosphere for sintering. According to the composite coating, the efficient all-weather dynamic thermal management effect can be achieved.

The invention relates to the technical field of photocatalytic materials, and discloses a bismuth-doped vanadate-based environmental functional material as well as a preparation method and application thereof. The material is Bi < x > (at) Mn < 2 > V < 2 > O < 7 >, wherein x is 1-7. The bismuth element is introduced on the premise of keeping the stability of the Mn2V2O7 main body crystal phase structure, so that the regulation and control of the material electronic structure and the activation of surface reaction active sites are realized. The preparation method comprises the following steps: by taking a sacrificial template as a carrier, introducing a manganese source, a vanadium source and a bismuth source through gas-phase ion exchange reaction at 425-550 DEG C to prepare the bismuth-doped manganese vanadate photocatalytic material. The material can efficiently drive a hydrogen evolution reaction and an oxygen evolution reaction at the same time under the condition of no sacrificial agent, the generation rate ratio of hydrogen to oxygen is close to the theoretical stoichiometric ratio of 2: 1, stable photocatalytic full decomposition of water is achieved, the overall photocatalytic activity of the material can reach 27.2 times that of undoped Mn2V2O7 at most, and the unexpected technical effect is achieved; the device is suitable for the field of solar-driven clean hydrogen production.

The application provides a bismuth-based nanomaterial and a preparation method and a photodiagnosis and treatment reagent thereof, wherein the preparation method comprises the following steps: S1, mixing a bismuth source precursor and a reducing agent to obtain a mixed solution; and S2, performing hydrothermal reaction on the mixed solution to obtain a bismuth-doped bismuth-based nanomaterial Bi / Bi compound, wherein the Bi compound comprises any one or more of Bi2Se3, Bi2S3 and Cu3BiS3. According to the preparation method, the plasmonic resonance peak is regulated to the near-infrared two region through bismuth doping, and the bismuth-based nanodiagnosis and treatment material can be self-enriched in a lesion area. The material has strong absorption, reflection and scattering characteristics under a system imaging light source, and has the functions of enhancing imaging effect and improving treatment efficiency.

The invention belongs to the technical field of magneto-optical crystal preparation, and relates to a bismuth-doped europium yttrium iron garnet magneto-optical crystal and a preparation method and application thereof. According to the preparation method, a magneto-optical crystal with a chemical formula of Eu < 3-x-y-z > Bi < x > Y < y > Tb < z > Fe < 5-w > Ga < w > O < 12 > is grown by adopting a top seed crystal method, wherein x ranges from 0.30 to 0.43, y ranges from 1.20 to 2.06, z ranges from 0.08 to 0.17, and w ranges from 0.09 to 0.17. The method has the advantages of high crystal growth speed, simple process and the like, and can be used for preparing centimeter-level single crystals. A Bi2O3-Fe2O3 self-service solvent is used for crystal growth, and compared with a Pb-containing cosolvent system, the Bi2O3-Fe2O3 self-service solvent is more environmentally friendly, and harm to a human body and pollution to the environment can be reduced. The Faraday rotation angle of the garnet crystal can be increased by doping Bi in a proper amount.