15 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.

The invention discloses a portable detection device and a detection method for detecting microcystic toxins based on bismuth oxybromide doped biomass carbon, and belongs to the field of photoelectrochemical detection devices. The prepared BiOBr-coated BC nano composite material is used as a working electrode and is applied to a detection device, and the detection device further comprises a control system and a detection system. The detection system is fixed in the detection system shell, and the control system is fixed in the control system shell. Wherein the control system controls the LED lamp to emit exciting light to irradiate the working electrode, and the nano material in the detection system enters an excited state after receiving light to generate current. After a detection target object is added, separation of hole electron pairs can be influenced, so that the change of current is influenced. The concentration of the detected object is reflected by detecting the current change after the target objects with different concentrations are added. The device provided by the invention can realize detection of weak current signals, and meanwhile, compact and small equipment provides a scheme for portable detection.

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.

A Bismuth-doped fiber-optic amplifier (BDFA) system in which a Bismuth-doped optical fiber (BDF) is pumped by a fiber-laser pump (rather than by a semiconductor pump). Because higher-power fiber-laser pumps permit over-pumping of the BDF, there are benefits to the fiber-laser-pumped BDFA that cannot be realized with inherently lower-power semiconductor pumps.

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 relates to a WO3 nanowire electrochromic capacitance film and a preparation method thereof, and belongs to the technical field of electrochromic and energy storage materials. The preparation method of the WO3 nanowire electrochromic capacitance film comprises the following steps: dissolving tungstic acid in hydrogen peroxide to obtain a peroxy tungstic acid solution; adding a bismuth-containing substance into the peroxy tungstic acid solution, and heating until the bismuth-containing substance is completely dissolved to obtain bismuth-doped peroxy tungstic acid sol; spin-coating the bismuth-doped peroxy tungstic acid sol on a conductive glass substrate to form a film, and then roasting to obtain a bismuth-doped WO3 seed crystal layer film; dissolving a tungsten source in a solvent to obtain a solvothermal solution containing the tungsten source, putting the bismuth-doped WO3 seed crystal layer film into the solvothermal solution containing the tungsten source to perform solvothermal reaction, and roasting to obtain the WO3 nanowire electrochromic capacitance film. The transmittance change of the WO3 nanowire electrochromic capacitance thin film can reach 80%, the coloring time and the fading time are 3.3 s and 2.7 s, the area capacitance is 78.15 mF / cm < 2 >, and the WO3 nanowire electrochromic capacitance thin film is kept stable after 70000 cycles of cycle test.

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 application relates to the technical field of photocatalysts, in particular to a preparation method and application of a bismuth tungstate-doped bismuth oxyiodate heterojunction photocatalyst. The method comprises the following steps: S1, preparing BiOIO3 powder; S2, preparing a BiOIO3 / Bi2WO6 heterojunction photocatalyst; the BiOIO3 powder obtained in the step S1 is added into deionized water and uniformly ultrasonically treated, then Bi(NO3)3.5H2O, Na2WO4.2H2O and a surfactant are respectively added, stirring is uniformly carried out, a mixed solution is obtained, finally, the mixed solution is loaded into a reaction kettle, reaction is carried out at 120-130 DEG C for 18-30 hours, deionized water washing and drying are carried out, and the bismuth tungstate-doped bismuth oxyiodate heterojunction photocatalyst is obtained. The bismuth tungstate-doped bismuth oxyiodate heterojunction photocatalyst prepared by the application has excellent photocatalytic degradation performance, and the degradation rate of norfloxacin can reach 94.84% through photodegradation.

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 invention discloses a C + L + U hybrid doped optical fiber and an amplifier. An optical fiber core comprises a first doping system, an isolation system and a second doping system in sequence from inside to outside; the first doping system and the second doping system are respectively one of a bismuth doping system and an erbium doping system, and are physically separated through an isolation system; the amplifier relates to one unit or two units, and when one unit is used, the mixed doped optical fiber is matched with a C + L + U broadband light source to realize full-band amplification; for the two units, the erbium-doped optical fiber and the bismuth-doped optical fiber are used for series connection, combination and amplification respectively, the erbium-doped optical fiber amplifies C + L wave band signal light, and the bismuth-doped optical fiber amplifies L + U wave band signal light. The structure is simple, the erbium-bismuth co-doping problem is solved through the layered doping design, and the advantages of being low in cost, compact in structure and wide in gain bandwidth are achieved.

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.

The embodiment of the present application provides an IBC battery aluminum paste, an IBC battery and a preparation method thereof, wherein the IBC battery aluminum paste provided by the embodiment of the present application comprises an organic additive, boron powder, aluminum powder, indium powder, an organic binder and doped glass powder, and the doping substance of the doped glass powder is one or more of lead and bismuth. By adding the indium powder in the aluminum paste and using the glass powder doped with lead and / or bismuth, the passivation layer region above the p+ doped region is directly printed, then high-temperature sintering is carried out, the positive electrode grid line can be contacted with the p+ doped region and formed, the step of secondary laser slotting is omitted, the passivation layer is prevented from being damaged by the secondary laser slotting, and the open-circuit voltage of the battery can be improved.

The present disclosure discloses broadband low-noise figure bismuth-doped silica fiber for the O+E band and its fabrication method. The fiber, from the outside to the inside, successively includes a cladding (1) and a core. The core, from the outside to the inside, successively includes a loose layer (2), an active core layer (3), a loose layer (2), an active core layer (3), and an inner core layer (4). The cladding (1) is made of pure silica material. The loose layer (2) and the inner core layer (4) are formed by depositing a SiO2 material doped with GeO2 and P205, and the active core layer (3) is deposited with Bi2O3 and PbS nanoparticles. According to the above technical solution, the Bi doping concentration and luminous efficiency can be improved, the fiber length can be reduced, the influence of amplified spontaneous emission (ASE) noise during transmission can be reduced.