110 results about "Hydroiodic acid" patented technology

The invention discloses an inorganic-organic hybrid compound crystal and a preparation method thereof, and belongs to the technical field of organic-inorganic hybrid materials. The preparation method comprises the following steps: mixing raw materials containing hydroiodic acid, organic cage molecules RCC3 and a lead source with a solvent, and carrying out solvothermal reaction to obtain the inorganic-organic hybrid compound crystal. The chemical formula of the prepared inorganic-organic hybrid compound crystal is ({H18 [C72H108N12] 2 [(Pb10I36)]}. 2I), wherein [C72H108N12] is RCC3 acidified by hydroiodic acid, the crystal has a supramolecular three-dimensional structure assembled by a [Pb5I8] 3-anion cluster unit and a protonated RCC3 molecular cage through electrostatic and hydrogen-bond interaction, and belongs to a monoclinic system, and the space group is P21. The crystal structure is a metal halide-based organic-inorganic hybrid crystal constructed by taking an organic molecular cage as nitrogen-containing cations and lead iodide for the first time.

The invention discloses a negative electrode electrolyte and an acidic tin-bromine flow battery, and belongs to the technical field of energy storage. The negative electrode electrolyte provided by the invention comprises an active substance and a supporting electrolyte, the active substance comprises tetravalent tin salt; the tetravalent tin salt is selected from at least one of tin tetrachloride, tin sulfate, tin bromide and stannate; the supporting electrolyte is selected from at least one of sulfuric acid, hydrochloric acid, perchloric acid, methanesulfonic acid, hydrobromic acid and hydriodic acid. According to the acidic tin-bromine flow battery provided by the invention, a proper tin ion ligand is selected in the negative electrode electrolyte, and the formed tin-based complex can effectively improve the redox kinetics of Sn < 4 + > / Sn < 2 + > and improve the efficiency of the tin-bromine flow battery. Besides, the modification of the negative electrode can further improve the adsorption of reactive active substances and improve the electron transfer rate, and the high specific surface area can provide more active sites, so that the reaction polarization is reduced and the battery performance is improved.

The invention belongs to the technical field of perovskite solar cell material preparation, and particularly provides a simple preparation method of high-purity formamidine hydriodate with controllable crystal form, which comprises the steps of feeding, concentrating, washing, dissolving, crystallizing, washing, drying and the like. The method can be used for synthesis in a room-temperature laboratory, has few steps, is simple to operate, and obviously reduces the difficulty in process production. The crystal is separated out by cooling instead of a poor solvent for recrystallization, and the crystal form of the product can be controlled simply by a simple programmed cooling program with high operability. And meanwhile, by adding the washing procedure, the recrystallization frequency is reduced, the use of an organic solvent is greatly reduced, the post-treatment complexity of the product is also reduced, and the phenomenon that the product is heated and exposed to light in the post-treatment process to generate impurities is effectively avoided.

The invention provides a method for preparing formamidine hydriodate through a one-pot method, formamidine hydriodate and application of formamidine hydriodate, and particularly relates to the technical field of perovskite photovoltaic cell precursor material preparation. The method comprises the following steps: adding an iodine elementary substance and a solvent into a reaction container, dropwise adding a reducing agent to carry out a first reaction, adding formamidine acetate in batches to carry out a second reaction at 0-10 DEG C after the reaction is completed, and carrying out post-treatment purification after the reaction is completed to obtain the formamidine hydriodate. The method directly selects the iodine elementary substance as the raw material, so that the use cost of the raw material is effectively reduced; one-pot integrated reaction is adopted in the preparation process, intermediate separation is not needed, the opportunity that metal impurities are introduced due to multiple transfer and purification operations in a traditional method is reduced, and the content of the metal impurities in the product can be reduced; distillation and other steps with high energy consumption and long time consumption are omitted, so that the reaction period is shortened, and the energy consumption is reduced.

This invention discloses a method for preparing high-purity hydroiodic acid based on an electrodialysis system, belonging to the fields of chemical engineering and new energy technology. The method includes: introducing a first iodide solution into the material chamber of a three-compartment bipolar membrane electrodialysis system; after acid-base preparation, a second iodide solution is obtained; the obtained second iodide solution is then introduced into the desalination and concentration chambers of a two-compartment homogeneous membrane electrodialysis system for electrodialysis concentration, yielding a third and fourth iodide solution; the products from each stage can be reused or sold after processing. This invention avoids the generation of the byproduct iodate, directly generating a high-purity, high-concentration hydroiodic acid solution, eliminating cumbersome and expensive purification steps, and completely achieving product separation. The process is simple, safe, and environmentally friendly. The acid produced by the three-compartment bipolar membrane electrodialysis system becomes a qualified hydroiodic acid product after passing through an MVR evaporation system, and the produced alkali, as a byproduct, can be sold or utilized, turning waste into treasure.

The invention relates to a hydroiodic acid preparation device and method, and relates to the technical field of new energy. The hydriodic acid preparation device comprises a first phosphoric acid circulating device, a second phosphoric acid circulating device, a hydriodic acid circulating device, a deiodide ion device and a membrane module, and the membrane module comprises a first phosphoric acid chamber, a second phosphoric acid chamber and a hydriodic acid chamber which are sequentially arranged and are in fluid communication. The second phosphoric acid chamber is communicated with the iodide ion removal device, so that even if a small amount of iodide ions enter the second phosphoric acid chamber, the iodide ions can enter the iodide ion removal device along with the circulation of the liquid to be subjected to deiodination treatment, the liquid subjected to deiodination treatment returns to the membrane module again to be recycled, and at the moment, the iodide ions contained in the circulating liquid do not exceed the standard; the iodide ions in the second phosphoric acid chamber cannot migrate to the first phosphoric acid chamber, so that the anode membrane cannot be damaged due to migration of the iodide ions, the service life of the membrane module can be greatly prolonged, and the production efficiency of the membrane module can be greatly improved.

The application discloses a preparation method of a wide-bandgap perovskite photoactive layer, and comprises the following steps: S1, lead iodide powder, cesium iodide powder and ytterbium bromide powder are proportioned according to a proportioning molar ratio, and an inorganic target material is prepared by using a hot-press sintering process; S2, formamidinium hydriodide powder and methylammonium bromide powder are proportioned according to a proportioning molar ratio, and an organic target material is prepared by using a normal-temperature preparation process; S3, a pretreated substrate is placed on a magnetron sputtering sample table, the target materials prepared in steps S1 and S2 are respectively installed on corresponding radio frequency sputtering targets, and the background of a magnetron sputtering system is vacuumized; S4, high-purity argon gas is used as a sputtering gas, and a wide-bandgap perovskite thin film is prepared by using a magnetron co-sputtering method; the sputtering power of the inorganic target material prepared in step S1 is controlled, the sputtering power of the organic target material prepared in step S2 is controlled, and the thickness of the thin film is controlled, so that the high-quality thin film is prepared by using the differential target material preparation process.

A preparation method and application of a perovskite film, which are used to solve the technical problem of how to have good stability while having good photoelectric conversion efficiency for the existing perovskite film. An inorganic halide salt containing bismuth, an N,N-dimethylformamide solution, hydroiodic acid and raw materials are used to prepare an intermediate material containing bismuth. Using this intermediate material as a raw material, together with an inorganic halide salt containing lead, cesium iodide and an N,N-dimethylformamide solution as raw materials, a precursor solution is prepared. The perovskite film prepared from this precursor solution has a perovskite crystal structure of ABX3. In the perovskite film of the present invention, the A site is occupied by CS and DMA, and the B site is occupied by Pb and Bi. The perovskite film in the present invention has good stability, and at the same time, the photoelectric conversion rate can exceed 10%. At the same time, a black perovskite thin film can be obtained at a temperature of 80 to 150 °C or below. The present invention is mainly used in the technical field of optoelectronic functional materials and devices.

A liquid-liquid reactor for the production of hydriodic acid and sulfur dioxide from sulfur-containing hydrocarbons or hydrogen sulfide dissolved in liquid hydrocarbon streams, iodine and water as part of a larger process for the production of hydrogen is described. Methods and equipment for the removal of sulfur from liquid hydrocarbons and the use of an iodine chemical cycle to produce hydrogen gas from the byproducts of this purification are described.

Embodiments of the present invention disclose a synthesis method, a battery device and a solar cell of a formamidinium-based ionic liquid perovskite precursor solution, including: adding organic sodium salt and formamidinium hydrochloride into ethanol respectively, stirring and dissolving to obtain a formamidinium hydrochloride solution and a sodium alkylate solution; dropping the formamidinium hydrochloride solution into the sodium alkylate solution drop by drop, stirring the mixed solution at 25-60 °C, and reacting for 24-36 h; filtering the reacted mixed solution, taking the filtrate, and rotary evaporating the obtained primary filtrate to remove the ethanol solvent, and shaking and washing with an organic solvent for 25-35 min; performing secondary filtration on the washed solution, taking the filtrate, and rotary evaporating the obtained secondary filtrate to remove the organic solvent to obtain an organic acid formamidinium ionic liquid; dissolving lead iodide and formamidinium hydroiodide in the organic acid formamidinium ionic liquid, and reacting at 40-80 °C for at least 5 h to obtain a formamidinium-based ionic liquid perovskite precursor solution. This method solves the problem of poor phase stability of FAPbI3 perovskite in a humid environment.

The application discloses a methyl guanidine dipeptide compound and a synthesis method and application thereof, and belongs to the technical field of chemical synthesis, and the chemical structural formula of the compound is as follows: the synthesis method of the methyl guanidine dipeptide compound comprises the following steps: L-ornithine hydrochloride and 1,2-dimethyl-2-isothiourea hydroiodide are heated and reacted overnight in an alkaline solution; the pH value of the solution is adjusted to be neutral, purification is carried out, water is added for dissolution and the solution is adjusted to be acidic, ion exchange resin is passed through, and an intermediate 1 is obtained; pure water and isopropyl alcohol are added to the intermediate 1 and adjusted to be alkaline; isovaleryl chloride is added to the solution and adjusted to be alkaline, and the solution is stirred and reacted at room temperature; the solution is kept alkaline, heated to 45-55 DEG C, adjusted to be weakly acidic, cooled to 5-15 DEG C, and the precipitate is collected, so that a crude product is prepared; the crude product is dissolved in a methanol-water mixed solution, gradient elution is carried out through liquid chromatography, and drying is carried out, so that the methyl guanidine dipeptide compound is prepared. The methyl guanidine dipeptide compound synthesized by the method has high purity, the synthesis process is simple, and the operation is convenient.

The present invention discloses a thermochemical sulfur-iodine cycle hydrogen production HIx phase purification device, belonging to sulfur-iodine cycle hydrogen production equipment. The two outlets of the filter used are respectively connected to the hydroiodic acid distillation tower and the barium sulfate decomposition tower. A liquid inlet tank is installed on the outer top surface of the filter tank of the filter. The liquid inlet tank is equipped with a driving water wheel. A liquid inlet pipe is provided above one side of the driving water wheel. A rotating shaft connected to the driving water wheel is rotatably installed behind the other side. One side of the conical filter cover is provided with a strip-shaped perforation along its generatrix direction. Below the strip-shaped perforation is a material receiving trough arranged downward and capable of swinging downward. A scraper is fixed to the side of the rotating shaft. When the scraper rotates with the rotating shaft, when it approaches the strip-shaped perforation, the driving assembly drives the material receiving trough to rotate downward by an angle, so that the sediment accumulated in the material receiving trough continues to slide downward. The present invention can dynamically and continuously filter and separate the barium sulfate in the hydrogen production process.

The invention relates to a synthesis method of a perovskite microcrystalline material, and belongs to the field of perovskite materials. The invention provides a synthesis method of a perovskite microcrystalline material, which comprises the following steps: mixing alkali metal iodide salt, lead acetate trihydrate and formamidine acetate, and reacting under preset conditions to obtain the formamidine lead iodide perovskite microcrystalline material. According to the method, an acid-free system is adopted for synthesizing the formamidine lead iodide perovskite microcrystal material for the first time, hydroiodic acid which is indispensable and extremely high in danger coefficient in a traditional aqueous phase method is completely abandoned, alkali metal iodide salt is creatively adopted as a green iodine source, high-quality formamidine lead iodide perovskite microcrystals are successfully synthesized, the material performance is guaranteed, and meanwhile the yield of the formamidine lead iodide perovskite microcrystals is increased. The safety of the synthesis process is greatly improved; in addition, the solid salt with stable properties is adopted, so that the sensitivity of the whole synthesis process to air and humidity is reduced, and better repeatability and stability are achieved.

The invention relates to a perovskite precursor solution, a perovskite thin film, a preparation method of the perovskite thin film and a photovoltaic module. The perovskite precursor solution comprises a perovskite precursor, an additive and a mixed solvent; the perovskite precursor is prepared from formamidine hydriodate and lead iodide; the additive comprises cesium iodide and methylamine hydrochloride; the mixed solvent is prepared from N, N-dimethyl formamide, N-methyl pyrrolidone and cyclohexyl pyrrolidone. The composition of the perovskite precursor solution is blended, the high-quality perovskite thin film with the micro-suede surface is spontaneously formed in the perovskite crystallization process, the micro-suede surface structure can increase the contact area between a perovskite layer and a subsequent functional layer, a tight mechanical interlocking effect is generated between the micro-suede surface structure and the interface of the functional layer, and the performance of the perovskite thin film is improved. Therefore, the interface adhesive force of the subsequent functional layer and the metal electrode is obviously improved, and the problem of performance degradation of the perovskite assembly caused by the packaging process is solved.

This invention relates to the field of alkali metal-chlorine secondary battery technology, and discloses an electrolyte additive, an electrolyte, and an alkali metal-chlorine secondary battery. The additive contains components A, B, and C in a mass ratio of 1:0.2-2.0:0.5-3.0; component A is selected from at least one of ethyl viologen dibromide, benzyl viologen diiodide, and 1,4-phenylenediamine hydroiodate; component B is selected from at least one of 3-(4-iodophenyl)-3-(trifluoromethyl)-3H-bisacrylidine, 1-bromo-2-fluorobenzene, and 4-(benzyloxy)-1-bromo-2-fluorobenzene; and component C is selected from at least one of 3-(trifluoromethyl)phenyltrimethylammonium bromide, (3-fluoro-4-iodophenyl)methylamine, and 3-iodobenzylamine. The electrolyte provided by this invention, when applied in an alkali metal-chlorine secondary battery system, exhibits high reversible capacity, cycle stability, and environmental adaptability.

The invention discloses a catalyst separation device and separation method for a process for synthesizing acetic acid by methanol carbonyl, and belongs to the technical field of acetic acid synthesis device.The catalyst separation device comprises a spray tower, a liquid preparation tank is arranged on one side of the spray tower, and the spray tower is connected with the liquid preparation tank through a high-pressure acid-resistant pump; a collecting pipe is fixedly mounted on one side of the high-pressure acid-resistant pump, a carbon monoxide tank is arranged on the other side of the spray tower, and a supplementing assembly is arranged at the top end of the liquid preparation box. By arranging the supplementing assembly, when the liquid level of a hydroiodic acid solution in the liquid preparation box descends, a floating ball automatically detects that the content of the hydroiodic acid solution in the liquid preparation box is low, so that a ball valve is driven to be opened, the hydroiodic acid solution flows into the liquid preparation box through a supplementing pipe, the negative pressure in the high-pressure acid-resistant pump is stable, output is uniform, and the stability of a catalyst is improved; the generation of a deactivated catalyst is reduced, and the separation effect in the spray tower is improved.

The invention provides a solar cell based on a Cu-doped lead-copper alloy perovskite light absorption layer and a preparation method of the solar cell, and the light absorption layer of the solar cell is a Cu-doped lead-copper alloy perovskite thin film Cs0. 05MA 0. 10FA 0. 85Pb1-xCuxI3, the preparation method of the lead-copper alloy perovskite thin film comprises the following steps: adding formamidine hydriodate, methylamine hydriodate, cesium iodide, lead iodide and cuprous iodide powder into a solvent, and uniformly stirring and mixing to prepare a perovskite precursor solution; the PbI2 powder and the CuI powder are uniformly mixed, the uniformly mixed precursor solution is spin-coated, annealing is carried out on a heating stage, the thin film is obtained, the ratio of the PbI2 powder to the CuI powder is 1-x: x, and x is equal to 0-10%. The copper-doped lead-copper alloy perovskite with the three-dimensional octahedral structure synthesized by the method has structural and thermodynamic stability and is high in fluorescence performance and light absorption performance, and the crystallization quality of a thin film is remarkably improved; when the perovskite thin film is used as a light absorption layer of the cell, a perovskite solar cell with high photoelectric conversion efficiency can be prepared, and the perovskite solar cell has excellent ultraviolet resistance and high temperature resistance stability.

The invention provides an organic-inorganic hybrid perovskite nanowire material, a preparation method thereof and a gas sensor, and relates to the technical field of semiconductor materials and devices. The preparation method comprises the following steps: mixing lead iodide, methylamine hydriodic acid / cesium iodide and phenylethylamine hydriodic acid / butylammonium iodide in a set molar ratio according to the metering number in the general formula of the organic-inorganic hybrid perovskite, and adding a perovskite benign solvent to obtain an organic-inorganic hybrid perovskite precursor solution; and dripping the organic-inorganic hybrid perovskite precursor solution on a substrate, exposing the organic-inorganic hybrid perovskite precursor solution in an anti-solvent atmosphere, and crystallizing to obtain the organic-inorganic hybrid perovskite nanowire material. The organic-inorganic hybrid perovskite nanowire material with a three-dimensional network structure is prepared by controlling the concentration of the perovskite precursor solution and the experimental temperature based on raw materials in a molar ratio required by a quasi-two-dimensional perovskite crystal, and the obtained product has a higher specific surface area.

The invention discloses a methylamine formamidino perovskite single crystal, a preparation method thereof and an X-ray detector, and belongs to the technical field of perovskite single crystal X-ray detectors. Methyl iodide amine, formamidino hydriodate and lead iodide are used as raw materials, anhydrous acetic acid is used as an additive, growth is carried out in a solvent through a seed crystal method, and the methylamine formamidino perovskite single crystal is obtained. Anhydrous acetic acid and formamidine generate hydrogen-bond interaction, formamidine is pulled to enter crystal lattices, so that phase separation is eliminated, acetate and Pb coordinate to delay formation of a lead-iodine framework, the speed of methylamine and formamidine entering the crystal lattices is balanced, meanwhile, the stability of a methylamine formamidine perovskite precursor solution is improved, stable growth of methylamine formamidine perovskite single crystals is achieved, and the methylamine formamidine perovskite single crystals are obtained. The single crystal has the advantages of high crystallinity, low defect density, large size and favorable X-ray response performance. The methylamine formamidine perovskite single crystal is high in controllability in the growth process, and the preparation method is high in operability, simple and easy to implement, short in preparation period, low in equipment requirement and low in cost.

The invention discloses a method for regulating wide-band gap perovskite crystallization through CsPb2Br5 and laminated photovoltaic application thereof, and particularly relates to the field of photoelectric materials and devices. Comprising the following steps: preparing a CsPb2Br5 nanosheet; the preparation method comprises the following steps: dissolving cesium iodide, formamidine hydriodate, lead iodide, lead bromide and CsPb2Br5 nanosheets in a solvent to obtain a perovskite precursor solution; wherein the perovskite precursor solution comprises two phases, namely a Cs0.2 FA < 0.8 > PbI < 1.8 > Br < 1.2 > perovskite precursor complex and a CsPb2Br < 5 >; and preparing the perovskite precursor solution into a perovskite thin film of the solar cell to obtain the solar cell. The crystal can be guided to uniformly grow along the vertical direction, the crystal boundary and defects are reduced, the crystal structure is optimized, and the stability and uniformity of the film are enhanced; and photo-induced halogen phase separation and defect formation can be inhibited, so that the photoelectric property and long-term stability of the perovskite thin film are improved.

This invention discloses a one-dimensional copper-iodine-based hybrid perovskite semiconductor material synthesized from imidazole, cuprous iodide, sodium phosphate, and hydroiodic acid using a solution-cooled crystallization method. The chemical formula is (C3H5N2)3CuI6. The preparation method includes the following steps: Step 1, weighing raw materials: weigh imidazole and cuprous iodide; Step 2, mixing raw materials: place imidazole and cuprous iodide in a glass bottle, add sodium phosphate and hydroiodic acid; Step 3, heating and stirring: heat and stir until dissolved; Step 4, cooling and crystallizing: place in situ and cool; Step 5, preliminary identification of the product: irradiate the crystal with an ultraviolet lamp and observe the color of the reflected light; Step 6, filtration and drying: filter and dry the crystal to obtain the product. This invention is simple and, by introducing cuprous iodide, achieves strong exciton recombination and efficient self-trapped exciton emission, exhibiting good photoelectric conversion performance, thus replacing lead-based hybrid perovskite materials to a certain extent.

The application discloses a method for continuously preparing hydriodic acid. The method comprises the following steps: dissolving phosphorous acid in oxygen-free water to obtain an aqueous phase feed liquid; dissolving elemental iodine in a water-insoluble inert organic solvent to obtain an organic phase feed liquid; continuously contacting the organic phase feed liquid with the aqueous phase feed liquid through micro-interface mass transfer to generate a reduction reaction; continuously discharging a mixed liquid obtained after the reaction; and collecting a lower aqueous phase after the mixed liquid is allowed to stand and separate into layers, and then filtering and performing vacuum rectification to obtain the hydriodic acid. The method for continuously preparing the hydriodic acid by using the water-inert organic solvent two-phase micro-interface mass transfer technology not only completely avoids the problem of excessively high local iodine concentration in the aqueous phase, reduces the generation of free iodine from the source, but also improves the inter-phase mass transfer efficiency, so that the reaction can be completely performed under low-temperature conditions, the thermal decomposition rate of the hydriodic acid is significantly reduced, and the decomposition and oxidation of the hydriodic acid are effectively inhibited.

This application discloses a shell-like layered flexible electromagnetic shielding composite film and its preparation method, belonging to the field of biomimetic composite materials. This application uses cellulose nanocrystals (CNCs) dispersion as raw material and prepares CNCs graft-modified materials through graft polymerization. Using graphene oxide, CNCs graft-modified materials, and cellulose nanofibers (CNF) as raw materials, a graphene oxide / CNCs graft-modified material / CNF composite film is prepared through evaporation-induced self-assembly. Then, it is reduced with a hydroiodic acid / short-chain fatty acid mixed solution to obtain a reduced graphene oxide / CNCs graft-modified material / CNF composite film. The graphene composite film prepared in this application exhibits good strength and toughness, good conductivity and fatigue-resistant conductive stability, and good electromagnetic shielding performance.

A method of operating a wellbore comprises mixing a dry shale inhibitor comprising a solid amine salt with a fluid to form a drilling fluid. The drilling fluid comprises an aqueous base fluid and a shale inhibitor formed from the dry shale inhibitor, the shale inhibitor comprising the dissolved amine salt, the amine salt comprising a reaction product of at least one amine selected from the group consisting of selected from the group consisting of hexamethylenediamine, 1,8-diaminooctane, 1,10-diaminodecane, bis(para-aminocyclohexyl) methane, and tetramethyl hexamethylenediamine and at least one acid selected from the group consisting of hydrochloric acid, hydrobromic acid, hydroiodic acid, sulfuric acid, phosphoric acid, methanesulfonic acid, toluene sulfonic acid, trifluoromethanesulfonic acid, and trifluoracetic acid. The method further comprises pumping the wellbore fluid into a wellbore extending through an earth formation. Related wellbore fluids, methods of forming the dry shale inhibitor, and packages including the dry shale inhibitor are also disclosed.

The application discloses a kind of coupling membrane separation and pressure swing adsorption's sulfur-iodine cycle hydrogen purification method and device.The method comprises: the decomposition product gas from hydrogen iodide decomposition unit enters preliminary treatment unit and is condensed to remove water, to realize preliminary separation;After preliminary separation, mixed gas enters membrane separation equipment, and membrane separation equipment is based on molecular size rejection mechanism to realize the preliminary separation between hydrogen and other impurities, and hydrogen in mixed gas enters the permeation side through membrane material, to form the preliminary purification hydrogen-rich gas stream;Hydrogen-rich gas stream enters PSA purification device, and PSA purification device uses gradient adsorbent bed to purify hydrogen-rich gas stream, to obtain high-purity hydrogen.The application solves the problem of low purity and low yield in sulfur-iodine cycle hydrogen purification, and provides an efficient purification scheme for sulfur-iodine cycle and other thermochemical hydrogen production technologies.

The invention discloses an anti-oxidation preparation method of two-dimensional tin-based perovskite and application of the two-dimensional tin-based perovskite in a low-threshold long-life laser. According to the method, a double-oxidation inhibition strategy is introduced, the large-size single crystal is synthesized by adopting a two-step growth method in an oxygen-free environment, and Sn < 2 + > oxidation is inhibited by adding electron donating molecules to interact with Sn < 2 + >. The method comprises the following specific steps: dissolving an organic ammonium salt, tin iodide and electron donating molecules in a mixed solvent of hydriodic acid and hypophosphorous acid, and crystallizing through an in-situ two-step supersaturated solution cooling method to obtain the high-purity two-dimensional tin-based perovskite single crystal. The nanosheet obtained through mechanical stripping is used as a gain medium and a resonant cavity, the laser threshold value as low as 0.88 mu J / cm < 2 > is achieved under femtosecond laser excitation, and excellent photoluminescence stability and laser stability are shown. According to the invention, the problems that tin-based perovskite is easy to oxidize and has many defects are solved, and a new idea is provided for the design of the lead-free perovskite nano laser.

The application provides a flexible perovskite battery and a preparation method thereof, and belongs to the technical field of solar cells, and comprises the following steps: mixing thermoplastic polyurethane and 3-isocyanate propyl triethoxysilane, adding anhydrous N,N-dimethylformamide, and heating to obtain a modified polyurethane solution; mixing formamidinium hydroiodide, iodide, methylammonium salt, the modified polyurethane solution and 4-hydrazinyl benzenesulfonic acid, adding DMSO / DMF solvent, and stirring to obtain a perovskite precursor solution; taking a PET / ITO substrate as a bottom electrode layer; spin coating an isolation layer on the bottom electrode layer; spin coating a SnO2 precursor solution on the isolation layer to obtain an electron transport layer; spin coating the perovskite precursor solution on the electron transport layer to obtain a perovskite layer; spin coating a hole transport layer mixture on the perovskite layer to obtain a hole transport layer; and evaporating a top electrode layer on the hole transport layer to obtain the flexible perovskite battery. The perovskite battery prepared by the application has good flexibility and tensile properties, and the water and oxygen resistance is improved.

The invention discloses a method for improving the photoyield of a Cs3Cu2I5 scintillator through Cr < 3 + > / Mn < 2 + > co-doping. Compared with a traditional high-temperature melting method, a vacuum evaporation method, an anti-solvent method and other processes which depend on complex equipment, high temperature and high pressure or a large amount of toxic organic solvents, the method has the advantages that important innovation is achieved on the scintillator preparation process, and high efficiency, environment friendliness and excellent expandability are achieved; according to the method, a solution method cooling crystallization strategy taking a hydroiodic acid-hypophosphorous acid mixed solution as a medium is adopted, so that the process is fundamentally simplified, the reaction condition is mild, the dependence on harsh equipment and the preparation cost are remarkably reduced, meanwhile, the use of a toxic solvent is avoided, and the method has better environmental friendliness. According to the method, heating reaction is carried out at the temperature of 180-240 DEG C for only 0.5-2.0 hours, then natural cooling is carried out for 8-24 hours, a large number of evenly-crystallized Cs3Cu2I5: Cr < 3 + > and Mn < 2 + > small broken crystals can be obtained, the technological process is high in controllability and repeatability, large-scale preparation of large-area and high-quality scintillator materials is easy to achieve, and a reliable path is provided for industrial popularization.

This invention discloses a hybrid perovskite crystal for dual stimulation response by heat and guest molecules, its preparation method, and its applications. The general molecular formula of the hybrid perovskite crystal is [C9H]. 22 PO][PbI3]·H2O, with a molecular weight of 783.1, wherein C9H 22 PO + The compound is composed of (1-hydroxy)triisopropylphosphine ions. The crystal is monoclinic with chiral space group P21. The (1-hydroxy)triisopropylphosphine organic ligand is dissolved in lead iodide using hydroiodic acid solution, and yellow, blocky one-dimensional perovskite crystals are obtained by a solution cooling method. The preparation method is simple, efficient, and reproducible. The compound exhibits piezoelectricity at room temperature. After high-temperature dehydration, the compound [C9H...]... 22 PO][PbI3]·H2O transforms into [C9H 22 [PO][PbI3], the latter undergoes two reversible phase transitions and exhibits second harmonic generation (SHG) switching and dielectric switching functions.

The present invention belongs to the field of new energy and photocatalytic technology, and specifically relates to a d-PtNi / MAPbI3 photocatalyst and its preparation method and application. A platinum source, a nickel source, NaBH4, PVP and ethylenediamine are uniformly mixed and then subjected to a solvent thermal reaction to obtain a PtNi alloy. The PtNi alloy is added to hydroiodic acid for a dealloying reaction to obtain d-PtNi; d-PtNi and MAPbI3 are added to a saturated MAPbI3 solution, stirred and subjected to a photodeposition reaction to obtain a d-PtNi / MAPbI3 photocatalyst. The d-PtNi / MAPbI3 photocatalyst has excellent photogenerated carrier separation ability, effectively improving the photocatalytic hydrogen production performance and cycle stability. At the same time, the low loading of d-PtNi reduces the preparation cost.