45 results about "Hydroiodic acid" patented technology

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 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 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.

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 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 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 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.

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.

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.

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 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.

The invention belongs to the field of organic-inorganic hybrid functional crystal materials, and relates to an inorganic-organic hybrid three-dimensional crystal as well as a preparation method and application thereof, raw materials containing hydroiodic acid, a protonated organic molecular cage C-D3T2 and a lead source are mixed with a solvent, and the inorganic-organic hybrid crystal is obtained through solvothermal reaction. The chemical formula of the prepared crystal is {[C-D3T2] [Pb5I14 (I3)]}. I. 6H2O; wherein the molecular formula of the C-D3T2 organic cage is H6 [C36H54N8]. The crystal is of a host-guest body structure assembled by a three-dimensional inorganic framework [(Pb5I14) I3] n5n-and a C-D3T2 molecular cage through electrostatic interaction and belongs to a monoclinic system, and the space group is C2 / c. The crystal is of a three-dimensional nested structure constructed by an organic molecular cage and inorganic lead iodide for the first time, and has certain application potential in the field of photothermal conversion.

The present application belongs to the technical field of waste lead-acid battery resource and lead iodide crystal preparation, and discloses a method for preparing lead iodide crystal by reducing lead paste through a short wet process, which comprises the following steps: S1: collecting waste lead paste from waste lead-acid batteries and reducing the waste lead paste to obtain reduced lead paste; the reduced lead paste is placed in an iodine salt solution and stirred to obtain a preliminary reaction solution; S2: adding a hydroiodic acid solution to the preliminary reaction solution, and then performing solid-liquid separation to obtain a crude crystal; S3: dissolving the crude crystal in an organic solvent, and then performing solid-liquid separation; the obtained filtrate is a lead iodide solution; S4: recrystallizing the lead iodide solution, and then performing solid-liquid separation to obtain a purified lead iodide crystal. Through the improvement of the overall design of the reaction participants and the process flow, the preparation of the lead iodide crystal can be realized through a short process, and the technical problems of long process steps, large reagent input, and low purity of the lead iodide product can be effectively solved.

The application discloses an inorganic-organic bismuth iodine hybrid semiconductor and a preparation method and application thereof, the hybrid semiconductor has a molecular formula of (Me2biz)BiI4, wherein (Me2biz) + is a methylated benzimidazole cation with a positive charge, (BiI4) ‑ in the material is a one-dimensional anion chain formed by coordination of trivalent bismuth ions and iodine ions, and a single crystal of the compound (Me2biz)BiI4 is obtained by selecting bismuth iodide, benzimidazole, methanol, acetone and hydroiodic acid as reaction raw materials and solvents and under a solvothermal reaction condition, and the single crystal has good stability and photocatalytic CO2 reduction catalytic activity.

The application relates to a tin-doped two-dimensional organic-inorganic hybrid perovskite material, a preparation method thereof and application of the material in photocatalytic hydrogen production, and belongs to the technical field of energy catalysis. The chemical formula of the material is Sn 0.05 (C5H 10 F2N)2PbI4, and the material is obtained by doping Sn 2+ ions into a (4,4-difluoropiperidinium)2PbI4 perovskite crystal lattice. The material is prepared by using 4,4-difluoropiperidine, lead iodide and stannous iodide as raw materials in a hydriodic acid system, and through heating dissolution and cooling crystallization under the reduction protection of hypophosphorous acid. The introduction of Sn 2+ optimizes the energy band structure of the material, enhances visible light absorption, and further induces a local polarization field, effectively promotes the separation and migration of photo-generated carriers, and thus realizes high-efficiency and stable photocatalytic hydrogen production performance. Through external ultrasonic, the interface charge separation efficiency and surface reaction kinetics are further improved, and the hydrogen production rate is significantly enhanced. The material has the advantages of mild preparation conditions, strong structure adjustability, high catalytic efficiency and good stability, and provides an effective way for developing a novel high-efficiency photocatalytic hydrogen production system.

The invention relates to a method for preparing a graphite felt-graphene composite electrode through covalent interface engineering, an electrode and a battery, and the method comprises the following steps: carrying out N / S co-doping pretreatment on graphite felt GF, preparing a graphene oxide aqueous solution, and carrying out ultrasonic dispersion to obtain a uniform GO dispersion liquid; completely immersing the N / S-GF substrate into the GO dispersion liquid to adsorb graphene oxide, and drying to obtain an N / S-GF (at) GO intermediate; the N / S-GF (at) GO intermediate and hydroiodic acid HI are subjected to a reduction reaction at the high temperature of 155-165 DEG C, graphene oxide is reduced into reduced graphene oxide rGO, meanwhile, sulfydryl-SH on the surface of an N / S-GF substrate and epoxy group C-O-C are subjected to a nucleophilic ring-opening reaction, a C-S-C thioether covalent bond is formed in situ, and a reduced graphene oxide rGO nanosheet is chemically bonded to the GF substrate; and washing and drying the reacted sample to obtain the N / S-GF (at) rGO composite electrode.

This invention relates to a method for rapid detection of acetonitrile in gases, belonging to the technical field of environmental pollutant detection technology. The method involves placing a test strip in the environment of the gas to be detected, observing the color change of the test strip, and qualitatively or quantitatively determining the acetonitrile concentration based on the color change. The test strip is prepared as follows: Step 1, dissolving 1.0-3.0 mmol of N,N-diphenyl-4-(quinoline-5-yl)aniline in 1.0-3.0 mL of N,N-dimethylacetamide, and adding 40.0-50.0 μL of hydroiodic acid aqueous solution to form solution A; dissolving 1.0-3.0 mmol of silver iodide in 1.0-3.0 mL of saturated potassium iodide aqueous solution to form solution B; mixing solutions A and B, and allowing them to stand to produce yellow crystals, forming the target analyte; Step 2, uniformly distributing the target analyte onto filter paper using a dispersion liquid, and then air-drying or baking to form the test strip. This invention enables rapid qualitative or quantitative detection of acetonitrile in gases.

The invention belongs to the technical field of perovskite solar cells, and particularly relates to a preparation method and application of alpha-phase FAPbI3 crystallis.The preparation method comprises the steps that a divalent lead source, formamidine hydriodate, hydriodic acid and hypophosphorous acid react at the room temperature in a water phase environment, and a delta-phase FAPbI3 crude product is obtained after filtering; then, the crude product is sequentially subjected to washing, anti-solvent extraction and pulping treatment, and a delta-phase FAPbI3 purified product is obtained; and finally, the delta-phase FAPbI3 purified product is subjected to annealing treatment, so that the delta phase is converted into an alpha phase, and the high-purity alpha-phase FAPbI3 microcrystal is obtained. The invention provides a preparation scheme of the alpha-phase FAPbI3 microcrystal which is simple in process, low in cost and easy for large-scale production, and the alpha-phase FAPbI3 microcrystal has a wide application prospect in photoelectric devices such as solar cells and the like.

This invention discloses a perovskite solar cell and its fabrication method, comprising: ultrasonically cleaning a substrate sequentially with a mixture of domestic water and glass cleaning agent, domestic water, and anhydrous ethanol, followed by drying with a nitrogen blower, and then treating it with an ultraviolet-ozone device; spin-coating an electron transport layer onto the treated substrate surface; dissolving lead iodide, formamidinium hydroiodate, methylamine iodide, methylamine chloride, cesium iodide, rubidium iodide, L-α-phosphatidylcholine, and phenylethylamine chloride in a mixture of N,N-dimethylformamide, dimethyl sulfoxide, and ethylene glycol monomethyl ether to obtain a perovskite precursor solution; scraping the perovskite precursor solution onto the surface of the electron transport layer to form a perovskite layer; spin-coating a hole transport layer onto the surface of the perovskite layer; and evaporating an electrode layer onto the surfaces of the hole transport layer and the substrate. This invention improves the coating speed and process efficiency while ensuring good device performance and stability.

The disclosure provides a perovskite film containing a bifunctional additive, a light-emitting diode and a preparation method thereof, wherein the bifunctional additive has a structure as shown in formula (1): wherein A1 is selected from C1-C5 alkyl; X is selected from at least one lone pair electron group containing N, O, F, Cl, Br and I, the lone pair electron group forms an intermolecular hydrogen bond self-assembly structure with the amino group in formula (1) as a physical spacing layer, inhibits the loss of non-radiative energy of the perovskite film caused by the generation of low-energy state exciton complexes at the interface of the charge transport layer, and passivates the unsaturated lead dangling bond caused by halide vacancies, thereby reducing defects in the perovskite film. By using the hydrogen bond or intermolecular force formed between the amino group in the additive and the amino group in formamidinium hydroiodide in the perovskite system, the grain growth during the perovskite film formation process is slowed down, thereby inducing the FAPbI3 perovskite film to have higher crystallinity, and improving the quality and light-emitting efficiency of the film.

The invention provides a synthesis method of 4, 4 '-(2-pyridylmethyl) bisphenol, which comprises the following steps: (1) 2-pyridine formyl chloride hydrochloride and phenyl ether are subjected to Friedel-Crafts acylation to obtain a compound II; (2) obtaining a compound III from the compound II under the action of a reducing agent sodium borohydride or potassium borohydride; (3) performing Friedel-Crafts alkylation on the compound III and phenol to obtain a compound IV; and (4) carrying out dealkylation on the compound IV in a reducing agent hydrobromic acid or hydroiodic acid to obtain the compound I 4, 4 '(2-pyridylmethyl) bisphenol. The method has the advantages of high yield, mild reaction conditions, few byproducts and simple process, and has high industrial application value.

This invention discloses a centimeter-scale and thermodynamically stable FAPbI3 single crystal, its preparation method, and a pre-derivatization method for molecular-level recognition of the chemical environment of the mother liquor solution. The preparation method includes: uniformly mixing formamidinium hydroiodate, lead iodide, and a single solvent containing a macrocyclic lactone structure compound to form a precursor liquid; forming crystal nuclei in the precursor liquid at a first temperature, and uniformly heating to a second temperature to maintain the cyclic structure of the macrocyclic lactone compound, resulting in centimeter-scale FAPbI3 single crystals; and isothermal treatment at the second temperature to promote ring-opening of the macrocyclic lactone compound to generate long-chain hydroxy acid molecules, resulting in centimeter-scale and stable FAPbI3 single crystals. This invention also provides a pre-derivatization method, using boron trifluoride methanol to perform methyl esterification derivatization on the target molecule, or silanized acetamide derivatization on the target molecule, followed by gas chromatography-mass spectrometry analysis, thereby achieving non-destructive recognition of the target molecule in the mother liquor solution chemistry.

The application discloses a safe and controllable synthesis method of ammonium iodide. The method uses iodine, ammonium bicarbonate and hydrazine hydrate as raw materials, and comprises the following steps: firstly, mixing ammonium bicarbonate and iodine in water to form a suspension; slowly adding hydrazine hydrate under cooling and stirring to react, in the process, hydrazine hydrate reduces iodine to generate hydriodic acid, which is immediately neutralized by ammonium bicarbonate to generate ammonium iodide; the reaction end point is judged by observing the color change of the reaction solution from deep red brown to colorless or light yellow; after the reaction is completed, high-purity ammonium iodide product is obtained through filtration, negative pressure concentration, cooling crystallization, solid-liquid separation and vacuum drying. Through raw material combination and process control, the reaction system is always in a mild environment, and the generation of explosive by-product nitrogen triiodide in the traditional ammonia method is fundamentally avoided. The method has the characteristics of simple process, safe operation, high product purity and the like, and is suitable for industrial production.

The application belongs to the field of new energy materials, and provides a preparation method of stannous iodide, which comprises the following steps: adding hydriodic acid into ultrapure water to configure a solution A; adding a tin source into pure water, and then adding an antioxidant to form a solution B; adding the solution A into the solution B, heating and reacting, and then adding a reaction catalyst, stirring, and obtaining an orange-red solid; separating the orange-red solid from a liquid, washing, and vacuum drying to obtain a crude stannous iodide; performing a first heating process on the crude stannous iodide to separate the stannous iodide from oxidized impurities; and then performing a second heating process to obtain stannous iodide for perovskite batteries through high-temperature purification; wherein the tin source contains divalent tin ions. The preparation method has mild reaction conditions, simple raw material acquisition and preservation, high reaction efficiency, and the prepared finished product has high quality and high purity and is not easy to be oxidized, and is used in narrow-bandgap perovskite solar cells and laminated solar cells, and the photoelectric conversion efficiency is significantly improved.

The application belongs to the technical field of photocatalysis, and particularly relates to a benzylamine lead iodine / molybdenum disulfide photocatalyst, a preparation method and application thereof, and a photocatalytic overall water splitting method. The preparation method comprises the following steps: mixing benzylamine and hydroiodic acid, and evaporating a solvent to obtain PMAI; dissolving lead iodide in hydroiodic acid, adding PMAI, crystallizing after heating and keeping warm, cooling, and separating to obtain PMA2PbI4 and a PMA2PbI4 saturated solution; soaking MoS2 powder in a n-butyl lithium solution, separating and washing a precipitate, and ultrasonically peeling to obtain MoS2 nanosheets; adding PMA2PbI4 and the MoS2 nanosheets to the PMA2PbI4 saturated solution, reacting after heating, cooling, and collecting a precipitate to obtain the benzylamine lead iodine / molybdenum disulfide photocatalyst. The benzylamine lead iodine / molybdenum disulfide photocatalyst can stably produce hydrogen in a dilute HI solution and has excellent activity, and can be placed in the same reaction system with an oxygen production catalyst to realize photocatalytic overall water splitting.

The invention discloses a methylguanidine dipeptide compound and a synthesis method and application thereof, and belongs to the technical field of chemical synthesis, the chemical structural formula of the compound is as follows: the synthesis method of the methylguanidine dipeptide compound comprises the following steps: heating L-ornithine hydrochloride and 1, 2-dimethyl-2-isothiourea hydriodate in an alkaline solution to react overnight; adjusting the pH value of the solution to be neutral, purifying, adding water for dissolving, adjusting to be acidic, and passing through ion exchange resin to obtain an intermediate 1; adding pure water and isopropanol into the intermediate 1 and adjusting the intermediate 1 to be alkaline; adding isovaleryl chloride into the solution, adjusting the solution to be alkaline, and stirring at room temperature for reaction; keeping the solution to be alkaline, heating to 45-55 DEG C, adjusting to be weakly acidic, cooling to 5-15 DEG C, and collecting precipitate to obtain a crude product; adding the crude product into a methanol-water mixed solution for dissolving, carrying out gradient elution through liquid chromatography, and drying to obtain the compound. The methylguanidine dipeptide compound synthesized by the method is high in purity, simple in synthesis process and convenient to operate.