92 results about "Selenide" patented technology

The invention provides a chlorine corrosion resistant cathode for electrolyzing seawater as well as a preparation method and application of the chlorine corrosion resistant cathode. The preparation method comprises the following steps: S1, dissolving a cobalt salt, a nickel salt, a morphology regulating agent and a structure-directing agent in a solvent according to a molar ratio of (1-2.5): (1-2.5): (8-12): (6-10), and stirring to form a first solution; s2, a titanium mesh and the first solution are subjected to a hydrothermal reaction at the temperature of 100-150 DEG C, and CoNi layered double hydroxide with the shape of a nanoneedle array grows on the titanium mesh in situ; s3, selenium powder and a reducing agent are dissolved in a solvent according to the molar ratio of 1: (0.8-1.5) and stirred to form a second solution; and S4, carrying out hydrothermal reaction on the titanium mesh on which the CoNi layered double hydroxides grow in situ and a second solution at 150-190 DEG C so as to grow cobalt-nickel bimetallic selenide of which the morphology is a nanoneedle array in situ on the titanium mesh, thereby obtaining the chlorine corrosion resistant cathode.

The application belongs to the technical field of materials, and provides a preparation method of transition metal selenide / metallic phase molybdenum disulfide in-plane heterostructure and application thereof. The method is to take metallic phase molybdenum disulfide nanosheet as a main body, embed 2-5 nm transition metal selenide nanoclusters into the interior of the metallic phase molybdenum disulfide nanosheet, and make the two be in the same plane. The specific steps are as follows: a transition metal sulfide in-plane heterostructure prepared by a two-step hydrothermal method is used as a precursor, a gas phase selenization method is used to convert the in-plane transition metal sulfide into its selenide under the premise of retaining the metallic phase molybdenum disulfide, and a transition metal selenide / metallic phase molybdenum disulfide in-plane heterostructure is obtained. The prepared transition metal selenide / metallic phase molybdenum disulfide in-plane heterostructure powder and self-supporting electrode are used as a water electrolysis hydrogen evolution catalyst. The preparation process is simple, the price is low, and the method is green and environment-friendly. The material has super-high catalytic activity as the water electrolysis hydrogen evolution catalyst.

The present invention relates to the synthesis of pure metal or multi-metal derivatives of ZIF-11, ZIF-12 or amorphous ZIF structures in high yield followed by calcination under inert conditions to produce in composite nanostructures one or more metal selenide dispersed on the surface of or embedded in a carbon matrix, and using these composites as electrodes for lithium ion batteries, sodium ion batteries, potassium ion batteries, supercapacitors or fuel cells.

The invention belongs to the technical field of photocatalysts, and particularly relates to a sulfur nickel selenide cocatalyst, a photocatalyst and a preparation method and application of the sulfur nickel selenide cocatalyst, and the preparation method of the sulfur nickel selenide cocatalyst comprises the steps that a soluble nickel source, a soluble sulfur source and a soluble selenium source are dispersed in an alcohol solvent to be mixed, a reaction is conducted for 10-20 h at the temperature of 160-200 DEG C, and the sulfur nickel selenide is obtained after washing and drying; the molar ratio of the soluble nickel source to the soluble sulfur source to the soluble selenium source is 1: (0.5-1.5): (0.5-1.5). In the cocatalyst, Se is introduced into a NiS2 structure, lattice spacing is increased, a replacement solid solution NiSexS2-x is formed, in the solid solution, Se atoms replace S atoms in an atomic level and enter NiS2 lattices instead of being simply attached to the surface of NiS2 or forming heterojunctions, a single-phase and uniform crystal structure is formed instead of physically mixed two phases, and the structure is stable.

The application discloses a method for preparing gamma-valerolactone by catalyzing acetylpicoline acid hydrogenation with molybdenum selenide, and aims to solve the problems of low catalytic efficiency and harsh reaction conditions of existing non-noble metal catalyst systems. The method comprises the following steps: placing molybdenum selenide catalyst, acetylpicoline acid and a solvent as raw materials in a high-pressure reaction kettle, replacing the air in the high-pressure reaction kettle with hydrogen gas at room temperature for multiple times, then continuously feeding hydrogen gas until the pressure in the high-pressure reaction kettle reaches 0.5-3.0 MPa, magnetically stirring the reaction under the pressure range, at a temperature of 100-200 DEG C and in a hydrogen atmosphere, and then cooling to room temperature, so as to obtain gamma-valerolactone. The catalyst used in the application is prepared under hydrothermal conditions, and due to the sheet morphology of the molybdenum selenide catalyst, rich edge active sites are presented, so that the conversion rate of acetylpicoline acid and the selectivity of gamma-valerolactone can reach 100% under mild reaction conditions.

This application relates to the field of electrolyte materials technology, and in particular to a method for preparing lithium selenide. The method includes: obtaining a precursor source, the precursor source including lithium nitride and a selenium source, and subjecting the precursor source to multiple calcination treatments to obtain lithium selenide. The present invention uses lithium nitride as a lithium source and a selenium source to undergo a redox reaction to generate lithium selenide and nitrogen gas. This method has a low cost, does not produce carbon impurities in the prepared product, and the prepared lithium selenide can be used directly as a high-purity raw material for solid electrolytes. In addition, the reaction between lithium nitride and selenium has low exothermic reaction, the reaction is easy to control, and the safety is higher, avoiding the problem of low safety caused by high exothermic reaction of elemental selenium and elemental lithium in the prior art.

The invention belongs to the technical field of organic synthetic chemistry, and particularly relates to a preparation method and medical application of a visible-light-driven bis (trifluoromethyl) selenide compound. The preparation method of the bis (trifluoromethyl) selenide compound comprises the following steps: by taking olefin, trifluoromethylselenotetramethylammonium and bis (trifluoromethylseleno) diselenide as reaction raw materials, stirring and reacting under the conditions of proper temperature and visible light irradiation in the presence of cuprous salt to obtain the bis (trifluoromethyl) selenide compound. The method has the advantages of mild reaction conditions, simplicity and convenience in operation, good functional group compatibility and the like. In addition, the bis (trifluoromethyl) selenide compound provided by the invention shows good potential in the aspect of anticonvulsion, and has the prospect of being further developed into anticonvulsion drugs.

This invention belongs to the fields of organic chemical synthesis technology and pharmaceutical synthesis technology, specifically relating to an α-arylselenium compound, its synthesis method, and its application. The preparation method includes the following steps: 1) using sulfone-thioylide compound and selenophenol as raw materials, adding them to a solvent, and stirring at 10-30℃ to obtain a reaction solution; 2) reacting the reaction solution at 10-30℃ to obtain the α-arylselenium compound.

This invention belongs to the field of composite electrode materials technology, and relates to a method for preparing a NiCoCu selenide composite MXene / carbon sphere thin film electrode material, comprising: first, dissolving ZIF-67 powder in a carbon sphere solution, then adding an MXene aqueous solution, stirring for 1-10 hours, filtering and drying to obtain ZIF-67@MXene / CS; second, preparing a solution according to the proportion of urea, copper source, nickel source and ethanol, immersing ZIF-67@MXene / CS, and reacting hydrothermally to obtain a NiCoCu-LDH@MXene / CS thin film; third, mixing the NiCoCu-LDH@MXene / CS thin film, selenium powder and sodium borohydride in a mass ratio of 0.5-1:1-2:1-2, reacting at 150-180°C for 12-24 hours, washing the obtained product with deionized water and drying to obtain the final product. MXene and carbon spheres together provide a flexible substrate for the self-supporting material, increasing its conductivity and specific surface area. Simultaneously, NiCoCu-Se intercalation into the MXene acts as an intermediate buffer, preventing MXene self-stabilization and making its structure more stable. When applied as the positive electrode material for supercapacitors, the self-supporting material avoids the use of binders, reducing the material's impedance and improving electrochemical performance.

According to the manganese selenide-carbon nanotube composite porous carbon material and the preparation method thereof provided by the invention, carbon nanotubes with excellent conductivity, nano selenium powder, manganese salt and polyvinylpyrrolidone are used as reaction raw materials, selenylation and carbonization are completed in one step through temperature programming, the reaction process is shortened, and the yield is increased. According to the preparation method, the production cost is reduced, the economic and time cost of production is reduced, the problems that various chemical reagents need to be added and the preparation process is complex in the current preparation process of the negative electrode material are solved, and the adopted preparation method is free of pollutant emission, conforms to the green chemistry principle and is beneficial to environmental protection.

This invention belongs to the field of materials preparation technology, specifically relating to a method for the arrayed preparation of patterned two-dimensional sulfides / selenides and its applications. This invention provides an effective method for synthesizing arrayed two-dimensional materials by separating nucleation and growth. This method utilizes photolithography to pattern and array the material, and precisely controls the nucleation sites through coating technology, providing an induction source for the subsequent growth of the arrayed two-dimensional material, thereby obtaining high-quality patterned two-dimensional material array growth. This method is not only simple to operate but also yields pollution-free and damage-free arrayed two-dimensional materials, showing broad application prospects in the integration or miniaturization of electronic devices.

The invention belongs to the technical field of inorganic nano material synthesis, and discloses a transition metal selenide integrated electrode and a preparation method and application thereof, the preparation method comprises the following steps: (1) carrying out acid treatment on carbon paper to obtain acid-treated carbon paper; (2) carrying out electrochemical deposition by taking the carbon paper subjected to acid treatment as a working electrode and a mixed solution containing two transition metal nitrates as an electrolyte to obtain a layered double-metal hydroxide integrated electrode; and (3) in the presence of protective gas, immersing the layered double-metal hydroxide integrated electrode in a mixed solution of selenium powder and sodium borohydride, and carrying out a reaction to obtain the transition metal selenide integrated electrode. The transition metal selenide integrated electrode disclosed by the invention is used for electrocatalytic nitrogen reduction reaction and has excellent electrocatalytic activity.

This invention relates to the field of crystal material preparation technology, specifically to a ternary layered selenide Ge 0.85 Bi 2.15+x Se4 semiconductor material and its preparation method. The preparation method includes the following steps: according to the chemical formula Ge... 0.85 Bi 2.15+x The molar ratio of germanium powder, bismuth powder, and selenium powder in Se4 is weighed, where 0 ≤ x ≤ 0.06. The weighed raw materials are mixed evenly and placed in a quartz tube. The quartz tube is then sealed under vacuum. The vacuum-sealed quartz tube is placed in a heating furnace and heated from room temperature to 900-950℃, held at this temperature for 12-24 hours. After the holding period, the quartz tube is removed from the heating furnace and quenched. The quenched and cooled quartz tube is then placed back in the heating furnace and heated from room temperature to 540-560℃, held at this temperature for 3-5 days for annealing, thus obtaining the ternary layered selenide Ge. 0.85 Bi 2.15+x Se4 semiconductor material. This invention successfully solves the technical problem of obtaining a single phase in the GeBi2Se4 system by precisely controlling the Ge / Bi ratio and employing high-temperature quenching and low-temperature long-time annealing processes.

The invention provides an amorphous substance coated positive electrode active material as well as a preparation method and application thereof. In the invention, the amorphous substance is selected from one or more of transition metal silicide, boride, phosphide, sulfide, selenide, carbide, amorphous carbon or amorphous silicon materials. The amorphous substance coating in the invention can form a compact self-healing passivation layer at the interface of the positive electrode material, not only can inhibit oxygen precipitation under high voltage in dynamics, but also can be combined with Li alkali metal to become a mixed conductor of ions and electrons, so that the conduction performance of the electrons and lithium ions is improved, and the interface impedance is reduced. Meanwhile, the surface of the positive electrode material can be uniformly coated by a special coating mode of the amorphous substance, so that side reaction between the positive electrode material and electrolyte is effectively inhibited, a solid electrolyte membrane on the surface of the positive electrode material is stabilized, formation of microcracks in the material is reduced, and the cycling stability is improved.

The invention discloses a copper ion intercalation two-dimensional beta-phase indium selenide material as well as a preparation method and application thereof. The method comprises the following steps: soaking a substrate loaded with a beta-InSe nanosheet in an organic solution of copper hexafluorophosphate tetraacetonitrile with the pH value of 4.0-6.5, and preparing the copper ion intercalation two-dimensional beta-InSe material through a solution heating and soaking method. According to the copper ion intercalation two-dimensional beta-phase indium selenide material and the preparation method thereof, a mild and efficient copper ion solution intercalation process is adopted, highly uniform and ordered distribution of copper between two-dimensional beta-InSe layers is achieved, the ferroelectric property and the electrical transport property of the copper ion intercalation two-dimensional beta-phase indium selenide material are regulated and controlled at the same time, and the prepared copper ion intercalation two-dimensional beta-phase indium selenide material is suitable for constructing a high-performance ferroelectric device.

The application provides a kind of multi-metal selenide heterojunction material and preparation method and battery negative material, comprising the following steps: S1 by coprecipitation method synthesis ABC-PBA precursor, add in the buffer solution containing Tris ultrasonic dispersion, then join dopamine in stirring, obtain black precipitate;S2 with deionized water and ethanol after washing the precipitate and dry to obtain ABC-PBA@PDA;S3 ABC-PBA@PDA and Se powder are respectively placed at the two ends of crucible, and selenization treatment is carried out, finally, ASe2 / BSe2 / CSe2@NC heterojunction material with yolk shell structure is obtained.The heterojunction material is applied to sodium ion battery negative material, and under the condition that the current density is 5 A g ‑1 The cycle performance curve is cycled 2000 times, and the specific capacity can be maintained at 380-320 mAh g ‑1 After cycling.

This invention relates to the field of nanoscale full-spectrum photocatalytic materials, and particularly to a method for preparing a molybdenum selenide / oxygen-deficient bismuth oxybromine@gold three-phase Z-type heterojunction photocatalyst. This method solves the problems of low photogenerated electron-hole separation efficiency, narrow full-spectrum response range, and poor stability in existing bismuth-based photocatalysts. The preparation method involves first preparing oxygen-deficient BiOBr nanospheres via a solvothermal method, then directly reacting tetrachloroauric acid with oleylamine in toluene to prepare small-particle-size monodisperse Au nanoparticles, which are then combined with oxygen-deficient BiOBr to prepare a BiOBr@Au nanosphere core-shell structure. Finally, a MoSe2 / oxygen-deficient BiOBr@Au three-phase composite material is prepared via a hydrothermal reaction. The catalyst of this invention exhibits absorption capacity under the full spectrum of light, and simultaneously achieves a synergistic enhancement of carrier separation efficiency and strong redox capability, demonstrating excellent photocatalytic activity and the ability to efficiently degrade pollutants and produce hydrogen.

The invention relates to the technical field of gas adsorption, in particular to selenide modified magnetic biochar as well as a preparation method and application thereof. The selenide modified magnetic biochar disclosed by the invention is prepared from magnetic biochar and CuFeSe2 loaded on the magnetic biochar. According to the selenide modified magnetic biochar disclosed by the invention, CuFeSe2 is loaded on the magnetic biochar, so that a large amount of Se <-> appears on the surface of a magnetic adsorbent, mercury can be rapidly fixed, and the mercury removal efficiency and the adsorption capacity are greatly improved. The selenide modified magnetic biochar disclosed by the invention is high in applicability and can be widely applied to tail end flue gas treatment in the industries such as thermal power, steel, cement, ceramics and glass.

This invention discloses a method for preparing one-dimensional network nanotube MOF-derived selenide@porous carbon materials and their applications. The method includes the following steps: dispersing ZnCo-BTC nanowires in an ethanol-water solution to form a uniform suspension A; dissolving 2-methylimidazole in an ethanol-water solution to form a solution B; preheating solution B to the reaction temperature in a water bath, pouring in suspension A, stirring at a constant temperature, centrifuging the product, washing it multiple times with ethanol and water, and finally drying it to obtain a one-dimensional tubular MOF material. Annealing this one-dimensional tubular MOF material with melamine in an argon atmosphere yields a porous carbon nanotube material with a network structure. Mixing the one-dimensional network porous carbon nanotube material with selenium powder and annealing it under argon protection yields the one-dimensional network nanotube MOF-derived selenide@porous carbon material. This invention is simple to operate, the process is controllable, and the prepared product can be widely used in electrochemical energy storage, separation, catalysis, and drug sustained release.

The invention discloses a preparation method of soluble selenium glycinate, which comprises the following steps: S1, reacting a selenium source with strong basic hydroxide in water to generate selenite; s2, reacting selenite with glycine and hydrogen peroxide in water for 12-16 hours to generate selenium glycinate; the reaction temperature is 5-15 DEG C, and the reaction needs to be carried out under a dark condition. The selenium glycinate product obtained by adopting the preparation method is stable in content and good in water solubility, the preparation process is simple, the cost is low, the operation is simple and convenient, additional chemical additives are not needed, and the operation steps are reduced; a by-product selenide salt in a chemical reaction can react with hydrogen peroxide to regenerate selenite, and the whole reaction process does not have redundant waste, so that the production concept of green chemistry is met; the product is good in solubility, wider in application field and better in application effect.

The application belongs to the field of environmental functional materials and water treatment technology, and specifically discloses a composite material for simultaneously removing antibiotics and hexavalent chromium in water based on a selenium iron / carbon molybdenum heterostructure, and a preparation method and application thereof. The composite material comprises composite selenium iron nanoparticles and carbon molybdenum, and a heterojunction interface is formed between the selenium iron nanoparticles and the carbon molybdenum. The selenium iron / carbon molybdenum catalyst constructed by the heterojunction engineering utilizes the enhanced active metal circulation reaction and a large number of in-situ generated interface defects to synergistically improve the intrinsic electron transfer capability, constructs a high-efficiency redox reaction interface platform, and efficiently activates the persulfate oxidant, so as to realize the simultaneous and rapid removal of antibiotics and heavy metals in water.

The invention provides a metal selenide coated ternary positive electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a porous ternary positive electrode microsphere material, metal salt, activated selenium powder, a surfactant and a solvent containing an alcohol compound to obtain a reaction solution; and carrying out hydrothermal reaction on the reaction liquid to obtain the metal selenide coated ternary positive electrode material. According to the preparation method provided by the invention, in-situ coating of the metal selenide nano layer on the surface of the ternary positive electrode material can be realized, so that dissolution of transition metal ions and loss of lattice oxygen are inhibited, the cycle life of a secondary battery under high voltage is prolonged, the high-rate performance of the secondary battery under high voltage is improved, and the preparation method is suitable for low-cost and large-scale production.

This invention relates to a method for preparing a vanadium selenide / vanadium oxide heterojunction photo-assisted zinc-ion battery, belonging to the technical field of vanadium selenide / vanadium oxide heterojunction photo-assisted electrochemical energy storage and zinc-ion battery. The method includes the following steps: mixing a selenium source solution and a vanadium source solution to obtain a reaction precursor solution; subjecting the reaction precursor solution to a hydrothermal reaction and washing to obtain vanadium selenide material; annealing the vanadium selenide material to form a vanadium oxide layer on its surface, obtaining a vanadium selenide / vanadium oxide heterojunction composite material; mixing the vanadium selenide / vanadium oxide heterojunction composite material, a conductive agent, and a binder, adding a solvent to prepare a slurry, coating the slurry onto the surface of a current collector, and drying to obtain a photocathode. The material and its application system described in this invention exhibit good specific capacity, rate performance, and cycle stability, and demonstrate good energy storage performance under illumination conditions; this invention is beneficial for further reducing electrode polarization and promoting the synergistic enhancement of electron transport and zinc-ion storage.

The invention discloses an MXene-SnO2 composite material, a preparation method and application. The composite material comprises a semiconductor substrate material and a tin-containing compound, the material of the semiconductor substrate is MXene; the MXene is at least one of Ti2C3 and TiMoC2, and the MXene is at least one of Ti2C3 and TiMoC2; the selenide is SnO2 (stannic oxide). According to the invention, MXene is taken as a substrate, in-situ construction of the oxide nanosheet on MXene is realized by adopting a one-pot method, the nanosheet has a loose structure and relatively large porosity, and a rapid dynamic process in an NH3 sensing process can be realized. Besides, by regulating and controlling the oxygen vacancies on the surface of SnO2, the construction of more Lewis acid sites can be realized, so that the affinity of the material to NH3 molecules is enhanced, and efficient sensing detection is realized.

The invention relates to a manganese selenide-coated manganese carbonate nano composite material and application thereof in detection of heavy metal elements. Wherein manganese carbonate has a relatively large specific surface area and rich active sites and can efficiently adsorb heavy metal ions such as cadmium and lead, manganese selenide has excellent conductivity and can accelerate electron transfer to enhance electrochemical signals, and through the synergistic effect of manganese carbonate and manganese selenide, the sensitivity, selectivity and stability of detection are remarkably improved, and interference in a complex environment can be effectively resisted; therefore, high-sensitivity detection of heavy metal ions is realized. After an electrode is modified by the manganese selenide-coated manganese carbonate nano composite material provided by the invention, the obtained product has good electrochemical activity and conductivity, so that the product has the advantages of wide detection range, high sensitivity, low background current, high selectivity and the like.

The application discloses a method for preparing a large-area two-dimensional indium selenide film crystal material based on a rapid cooling chemical vapor deposition method, and a product and application thereof, and relates to the technical field of two-dimensional material preparation. In the method, the vertical distance between a precursor and a substrate is about 3 millimeters or about 1 millimeter, and compared with a distance of more than 10 cm required by a traditional chemical vapor deposition method, the super-short transmission distance can provide a stable, uniform and continuous gas source supply on a growth substrate, so that a large-size indium selenide film is obtained. The two-dimensional indium selenide film prepared by the method has high electron mobility, high quality and a relatively wide band gap, and the beta prime and alpha phases have ferroelectric effects, so that the two-dimensional indium selenide film has a wide prospect in applications of ferroelectric transistors and photoelectric detectors.

The invention discloses a titanium selenide loaded platinum monatomic bio-based composite material and an electrode preparation method thereof, H2PtCl6 is dissolved in absolute ethyl alcohol, mixed with agricultural and forestry waste powder and TiSe2 nanoparticles and dried; and carrying out reduction treatment on the obtained powder by using mixed gas of ammonia gas and hydrogen, washing, centrifuging for multiple times by using absolute ethyl alcohol, and drying to obtain the composite material with the monatomic PtNC loaded on the TiSe2 nanoparticles. And preparing a coating solution from the prepared PtNC-TiSe2 powder material, coating the coating solution on a substrate for drying, and sintering the electrode containing the coating in a heating furnace to finally obtain the PtNC monatomic doped titanium selenide electrode. The invention provides an effective atomic level engineering strategy to improve the electrocatalytic property of the Pt-based electrocatalyst and improve the electrochemical redox demercuration performance, meanwhile, active sites on the surface of the metal selenide play a leading role in improving the demercuration performance of the Pt-based electrocatalyst, and single-atom Pt can be combined with more mercury in an electro-adsorption manner.

A method of direct deposition of multinary metal polyselenide films, including precipitating alkylammonium polyselenide with an antisolvent, redissolution of precipitated alkylammonium polyselenide with a solvent, dissolving at least one metal source, such as elemental metal, a metal containing compound, or a combination thereof, in the solution containing polyselenide ions to provide a precursor solution, and using the precursor solution to fabricate metal polyselenides. The metal source is selected from the group consisting of Ag, Cu, Zn, Cd, In, Ga, Sn, Ge, As, Cu2Se, Cu2O, CuCl, and combinations thereof. The precursor solution is substantially sulfur-free.

The invention relates to the technical field of chemical power sources, in particular to a bimetallic selenide modified alkali metal negative electrode material and a preparation method and application thereof.The preparation method comprises the steps that prepared vanadium atom doped tungsten diselenide (VxWSe) powder is evenly coated on the surface of sodium / potassium metal, an adjustable interface protection layer is constructed, and the surface of the sodium / potassium metal is coated with the bimetallic selenide modified alkali metal negative electrode material; and the adsorption and transfer of sodium / potassium ions are optimized by utilizing the unique layered structure. The controllable interface protection layer can provide excellent dendrite growth prevention and desolvation functions, and the cycle life of the alkali metal battery is greatly prolonged by reducing side reactions. In addition, the preparation method has the advantages that the operation is simple, modification factors are easy to control, and large-scale production can be realized.

The invention relates to a compound selenium-silicon-mercury-cesium and a selenium-silicon-mercury-cesium infrared nonlinear optical crystal as well as a preparation method and application thereof. The molecular formula of the compound is Cs2HgSi3Se8, the molecular weight is 1182.36, the molecular formula of the crystal is Cs2HgSi3Se8, the molecular weight is 1182.36, the crystal is crystallized in an orthorhombic crystal system, the space group is P212121, and the cell parameters are as follows: a = 7.6202 (10), b = 12.7926 (19), c = 17.517 (2), alpha = beta = gamma = 90 degrees, Z = 4 and the volume is 1707.6 (4) 3. The crystal is prepared by adopting a high-temperature melt method, a chemical vapor transport method or a Bridgman-Stockbarger method, is of a non-centrosymmetric structure, and has the advantages of maximum band gap, moderate non-linear optical effect, wide light-transmitting wave band, higher hardness, good mechanical property, difficulty in fragmentation and deliquescence and easiness in processing and storage in all Hg-based selenide reported at present; the method can be used for manufacturing infrared nonlinear optical devices. The method has important application in the fields of infrared photoelectric countermeasure, spectrum technology, laser communication, remote sensing distance measurement and the like.