17 results about "Tin selenide" patented technology

The invention discloses a carbon nanotube coated tin selenide composite negative electrode material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion battery negative electrode material preparation. The preparation method comprises the following steps: firstly, weighing a mixture of selenium powder, tin powder and tin tetraiodide and a multi-walled carbon nanotube according to a certain proportion, separately placing the materials in two areas of a quartz tube, vacuumizing and sealing the quartz tube, and then heating the material in double temperature areas under a certain condition to obtain the carbon nanotube coated tin selenide composite negative electrode material. In an electrode made of the composite material, the tin selenide nanowires are uniformly filled in the multi-walled carbon nanotubes. The multi-walled carbon nanotubes can be used as a firm volume expansion buffer layer and a conductive enhancement layer, and the composite material shows excellent long cycle stability and excellent rate capability when being used as a lithium ion battery negative electrode.

The application provides a thermoelectric material, a preparation method thereof and a thermoelectric device, and the chemical formula of the thermoelectric material is Sn (1‑x‑y) Cu x La y Se, wherein 0<=x<=0.2 and 0 The thermoelectric material provided by the application is doped with lanthanum (La) and / or copper (Cu) to effectively control the polycrystalline tin selenide lattice arrangement and macroscopically, so that the thermoelectric material has high hole carrier concentration and dense crystal defects, thereby improving the ZT value of the thermoelectric material Sn (1‑x‑y) Cu x La y Se, and further improving the thermoelectric conversion efficiency of the thermoelectric material. Meanwhile, the thermoelectric material has a wide temperature range, can effectively utilize heat energy exceeding 200 DEG C, and has good application prospect.

This application discloses a method for preparing and applying a tin selenide-supported ferruginous zeolite catalyst, belonging to the field of catalytic chemistry. The preparation method includes: pre-crystallizing a mixed solution containing a silicon source, an aluminum source, a template agent, and water to obtain a silica-alumina gel; under stirring conditions, slowly adding a mixed solution containing a tin source, a selenium source, and ethanol sequentially, and then slowly adding an alkali to the silica-alumina gel to obtain a mixed gel; placing the mixed gel in a sealed container for hydrothermal crystallization; washing and drying the hydrothermally crystallized product, followed by calcination, to obtain the tin selenide-supported ferruginous zeolite catalyst. This application, by modifying silica-alumina molecular sieves with tin selenide, enables one-step ethanol production using hydrogen and carbon dioxide as raw materials in a fixed-bed reactor. Furthermore, the selectivity of ethanol can be adjusted by modifying the catalyst preparation process.

The invention relates to the technical field of lasers, in particular to an electro-absorption modulated laser which comprises a substrate and an epitaxial layer, the epitaxial layer sequentially comprises a buffer layer, a bottom DBR layer, a lower limiting layer, an active area, an upper limiting layer and an insulation limiting layer from bottom to top, and the insulation limiting layer is made of tin selenium. A limiting hole used for laser output is etched in the insulation limiting layer. According to the application, oxidation limitation, structure optimization and process innovation are replaced by topological limitation, a traditional VCSEL, an EAM-VCSEL, a silicon light scheme and an electro-absorption modulated laser (EML) are comprehensively surpassed in core dimensions such as performance, reliability, integration level and power consumption, the scheme is particularly adapted to the requirements of 1.6 T / 3.2 T high density, low power consumption and wide temperature range of an AI data center, meanwhile, the scheme is compatible with an access network 1310 nm wave band, and the application range is wide. The method is a full-scene laser communication scheme capable of covering short-distance interconnection and middle-distance transmission.

The invention relates to the technical field of thin film thermoelectric materials, and particularly discloses a preparation method of a single crystal tin selenide thermoelectric thin film, and the preparation method specifically comprises the following steps: S1, cleaning a substrate; s2, placing a substrate; s3, vacuumizing is carried out; s4, degassing the substrate; s5, heating the evaporation source; s6, growing the thin film; s7, cooling the film; and S8, taking out the sample. The molecular beam epitaxy method is used for preparing the thin film, the selenium beam / tin beam ratio is strictly controlled, H2Se is adopted for selenium vacancy repairing in the thin film growth process, the high-quality a-axis orientation single crystal tin selenide thermoelectric thin film can be obtained, the thin film has good thermoelectric performance, and integrated packaging of chips is easy to achieve.

The application relates to a method for photocatalytic reduction of Cr(VI) based on an organic hybrid indium tin selenide (Bmmim)8In8Sn8Se 30 (Se4)2 as a catalyst for photocatalytic reduction of Cr(VI), belonging to the technical field of photocatalysis and heavy metal ion wastewater treatment. The application uses organic hybrid indium tin selenide (Bmmim)8In8Sn8Se 30 (Se4)2 as a catalyst for photocatalysis. The material exhibits high photocatalytic activity in an acidic environment with pH=3, reduces Cr(VI) in wastewater into Cr(III), and has good reusability and cycle stability. Compared with other catalysts, the reduction rate is 26.3, 10.8 and 7.1 times that of P25, In2Se3 and SnSe2 respectively. Under sunlight irradiation, the material also shows good photocatalytic performance for Cr(VI) reduction.

This invention belongs to the field of electrochemical energy storage, and discloses a molybdenum / tin selenide / sulfur-nitrogen co-doped graphene composite material, its preparation method, and a lithium-ion energy storage device. The invention uses graphene oxide, sodium molybdate tetrahydrate, sodium stannate trihydrate, thiourea, and dicyandiamine as raw materials, and prepares the composite material using a simple hydrothermal method and heat treatment in an argon / hydrogen mixed atmosphere. The method is simple and low-cost. The prepared molybdenum / tin selenide (MoSe2-SnSe) nanoparticles loaded on sulfur-nitrogen co-doped graphene form a three-dimensional hierarchical composite structure, which can effectively improve the conductivity of the electrode material and alleviate the volume expansion effect of the electrode material during charge and discharge, thereby achieving the goal of improving the electrochemical performance of lithium-ion batteries and lithium-ion hybrid capacitors.

The application discloses a ytterbium-doped tin selenide thermoelectric material and a preparation method thereof. The method is to synthesize ytterbium-doped tin selenide powder material by a solvothermal method, and to sinter the sample into a block by using a large current to heat in a pressurization process by using a discharge plasma sintering technology; the plasma generated by the pulse current and the pressurization in the sintering process are favorable for reducing the sintering temperature of the powder, and meanwhile, the characteristics of low voltage and high current can enable the powder to be rapidly sintered and densified. The method is simple, time-consuming is short, and a small amount of heavy rare earth element ytterbium is doped, so that the power factor of the material is improved by 60% at 823K, the thermoelectric figure of merit zT reaches 1.1, and the thermoelectric performance of the tin selenide material is obviously improved.

The application discloses a doped copper-selenium tin thermoelectric catalyst and a preparation method and application thereof, and belongs to the technical field of environment-friendly thermoelectric materials. ‑ A tetravalent selenium source is taken into a solvent I, stirred uniformly to obtain a solution I; a divalent tin source, an OH ‑ source, a divalent copper source are sequentially added into a solvent II, continuously stirred during the adding process, stirred uniformly to obtain a solution II, the solution I and the solution II are mixed, a reducing agent is added after uniform stirring, and a hydrothermal reaction is carried out; after the reaction is completed, the remaining solid is obtained by removing the liquid, and the obtained solid is cleaned and dried to obtain the doped copper-selenium tin thermoelectric catalyst. The application uses low-content copper-doped selenium tin nanomaterial as a thermoelectric catalyst to treat organic pollutants in wastewater, the preparation process of the nanomaterial is simple, safety is good, cost is low, raw materials are widely sourced, the nanomaterial has good thermoelectric performance and catalytic performance, and can be applied to the field of environmental protection.

The invention relates to a preparation method of an organic hybrid silver tin selenide [CH3NH3] 2 [H3O] Ag5Sn4Se12. C2H5OH (MSTS) and poly 3, 4-ethylenedioxythiophene (PEDOT) coupled MSTS (at) PEDOT composite material and a Cr (VI) photocatalytic reduction performance of the MSTS (at) PEDOT composite material, and belongs to the field of nano composite material preparation and catalysis. The preparation process of the nano composite material comprises the following three steps: synthesis of MSTS crystals, preparation of MSTS nano particles, and loading of PEDOT on the surfaces of the MSTS nano particles. Based on an energy band structure of the MSTS and HOMO and LUMO track energy levels of the PEDOT, a Z-type heterogeneous interface is constructed by compounding the MSTS and the PEDOT, and effective separation of photo-induced electrons and holes is realized, so that the efficient photocatalytic reduction capability on Cr (VI) is shown. In addition, the nano composite material has strong anti-interference capability on complex substances existing in natural water in the process of photocatalytic reduction of Cr (VI), and shows excellent cycle stability.

The application discloses an indium selenide / tin selenide binary heterojunction nanomaterial and a preparation method and application thereof. The preparation method is as follows: dispersing selenium powder I and polyvinylpyrrolidone in water, then adding hydrazine hydrate and stannous chloride in sequence, mixing and stirring, and then performing hydrothermal reaction to obtain SnSe nanosheets; dispersing the SnSe nanosheets in triethylene glycol, then adding indium tetrachloride and selenium powder II in sequence, mixing and stirring, and then performing solvothermal reaction, and the binary heterojunction nanomaterial is obtained. The binary heterojunction nanomaterial has excellent catalytic performance and high cycle stability, and has a good removal effect on organic and inorganic pollutants. The preparation method is simple, low in cost and convenient to operate.

The invention provides a negative electrode material, a preparation method thereof and a sodium ion battery, and aims to improve the service life and safety performance of the sodium ion battery by providing the negative electrode material with good cycle performance. The negative electrode material comprises heterogeneous material particles, wherein the heterogeneous material particles comprise tin selenide and iron diselenide; wherein it can be obtained through a high-resolution transmission electron microscope image of the heterogeneous material particles, and the heterogeneous material particles have lattice stripes of the tin selenide and lattice stripes of the iron diselenide.

The invention belongs to the technical field of preparation of gas sensor materials, and particularly relates to fluorine-doped tin selenide as well as a preparation method and application thereof. The fluorine-doped tin selenide is of a nanosheet structure and is in a transversely expanded ultrathin nanosheet form, and the thickness of the fluorine-doped tin selenide is 1 nm-10 nm; the fluorine ions are inserted between the tin selenide layers and cause lattice distortion, and at least part of the fluorine ions are adsorbed on the (001) crystal face. The gas sensor based on the fluorine-doped tin selenide has a response value up to 226.93% to 10ppm NO at room temperature, a detection limit as low as 400ppb, response time of 106.13 seconds and performance fluctuation of less than 15% in a high-humidity environment (greater than or equal to 60% RH), and shows excellent moisture resistance and stability. Besides, in a nitrogen-containing gas circulation test, the material has higher response characteristics (response values are respectively 243.93% and 206.54%) on NO and NO2, and the response characteristics are obviously superior to those on gases such as H2S, NH3 and VOCs.

The application discloses a kind of QLED devices based on cubic core-shell multi-well quantum well light-emitting layer and preparation method thereof, by with P-type material tin selenide as core, with N-type material zinc selenide as shell, with P-type material tin selenide as second well layer, again with N-type material zinc selenide as shell cubic SnSe / ZnSe / SnSe / ZnSe multi-well core-shell quantum well as light-emitting layer, preparation includes organic hole transport layer, inorganic electron transport layer, light-emitting layer LED device.The application uses hot injection method to prepare cubic SnSe / ZnSe / SnSe / ZnSe multi-well core-shell quantum well material, its structure is novel, light-emitting layer morphology is excellent regular, device structure is stable and efficient, the quantum well material prepared has continuous PN heterostructure, cubic morphology, good structural stability, the quantum well LED device prepared has excellent electroluminescent efficiency and external quantum efficiency.

The application provides a cubic tin selenide-based thermoelectric crystal and a preparation method thereof, and relates to the technical field of crystal synthesis. The preparation method comprises the following steps: tin, silver, antimony and selenium are weighed and put into a first container, vacuumizing and sealing; the first container is heated to 953-1373K and kept for 15-30h; after cooling, the alloy ingot is taken out and put into a second container, vacuumizing and sealing; the second container is heated to 973-1373K and kept for 5-30h, then cooled to 923-1173K at a first cooling rate, then cooled to 873-923K at a second cooling rate, and then cooled to room temperature at a third cooling rate. The application prepares a bulk cubic tin selenide single crystal material, realizes a very high grain orientation degree, and can obtain a high-performance thermoelectric material.

This invention relates to a sodium-ion battery anode material, its preparation method, and its application. It addresses the technical problems of poor cycle stability and low rate capability of existing selenide electrodes. The sodium-ion battery anode material of this invention is a self-supporting cobalt-tin selenide nanowire array with a heterogeneous structure grown on carbon cloth. Preparation method: Cobalt source, tin source, alkali source, and additives are added to a solvent, mixed evenly, and then transferred to a reaction vessel. Pretreated carbon cloth is then vertically placed in the mixture. After a solvothermal reaction, selenization is performed in a tube furnace to obtain the anode material. This material exhibits excellent sodium storage characteristics at a current density of 0.1 Ag. ‑1 After 100 cycles at the current density, the capacity remained at 885.4 mAh g. ‑1 It boasts a capacity retention rate of up to 98.6%, and its manufacturing process is simple, with readily available raw materials and low cost, making it suitable for use in the sodium-ion battery field.

The invention discloses a SnSe / SWCNTs composite thermoelectric material and a preparation method and application thereof, and belongs to the technical field of thermoelectric materials. The SnSe / SWCNTs composite material is successfully prepared by using an inorganic thermoelectric matrix material tin selenide and an organic conductive material single-walled carbon nanotube to construct a composite material system in an in-situ compounding manner. By adopting the raw materials and the preparation process, C-Sn covalent bonds can be formed in the SnSe / SWCNTs composite material, the SWCNTs are uniformly dispersed in the composite material in the form of the C-Sn covalent bonds, a good conductive network and a stress transfer path are established in a SnSe matrix, phonon scattering is increased while the electric transport performance and the mechanical performance are improved, the heat conductivity is reduced, and the thermal conductivity is improved. Therefore, decoupling of the electric transport performance and the heat transport performance and remarkable improvement of the thermoelectric performance are achieved, and a new thought is provided for design and development of the high-performance composite thermoelectric material.