34 results about "Reduction Activity" patented technology

The application discloses a platinum-based high-entropy intermetallic compound and a preparation method and application thereof as a hydrogen fuel cell cathode catalyst, and belongs to the field of fuel cells.The preparation method comprises the following steps: S01, adding platinum salt, at least five other metal salts and a nitrogen-rich organic compound into an organic solvent, uniformly mixing, and obtaining a metal precursor mixed solution; S02, adding a carbon carrier into the metal precursor mixed solution, fully mixing, drying, collecting, and obtaining a precursor; and S03, heat treating the dried precursor under a reducing atmosphere, and performing heat preservation treatment, so as to obtain the platinum-based high-entropy intermetallic compound.The preparation method is simple, low in cost and good in repeatability, the prepared catalyst has the advantages of uniform particle size and high oxygen reduction activity, and has a good development prospect in the field of hydrogen fuel cell catalyst applications.

The invention discloses a covalent organic framework with oxidation-reduction activity and a bionic nano-channel structure as well as a preparation method and application of the covalent organic framework, and belongs to the technical field of environmental protection. According to the preparation method, 2, 4-dihydroxybenzene-1, 3, 5-tricarboxaldehyde and 2, 5-bis (allyloxy) terephthaloyl hydrazine are taken as raw materials, a two-dimensional covalent organic framework with oxidation-reduction activity is synthesized, and then a sulfonic acid group with negative charges is covalently grafted, so that a functional material with a bionic nano-channel structure is formed. The material has regular porous channels and rich functional sites, the porous channels provide efficient mass transfer paths and adsorption spaces for uranyl ions, and the functional sites realize specific recognition of the uranyl ions through oxidation-reduction reaction and electrostatic interaction, so that the material shows synergistic advantages of strong selectivity, high adsorption capacity and rapid adsorption kinetics on uranium. The method is simple and low in cost, and the prepared material is clear in structure, good in hydrophilicity, capable of efficiently adsorbing uranyl ions and good in application prospect.

The invention belongs to the field of environmental biotechnology and nano material application, and relates to a method for accelerating microorganisms to reduce selenite based on immobilized riboflavin. Aiming at the problems of poor stability, difficulty in recovery, non-repeated use and the like of dissolved riboflavin serving as an electron shuttle, riboflavin is grafted on the surface of a multi-walled carbon nanotube through a covalent binding method, and immobilized riboflavin capable of being recycled is constructed. The material can accelerate extracellular electron transfer of shewanella MR-1, and toxic sodium selenite is efficiently reduced into low-toxicity or non-toxic elemental selenium. Results show that the immobilized riboflavin not only maintains high reduction activity of riboflavin, but also has excellent cyclic utilization performance, still maintains high reduction rate after being repeated for multiple times, and effectively reduces operation cost and resource loss. According to the invention, an efficient, economical and sustainable application scene is provided for a microorganism-electron shuttle combined remediation technology, and a new thought is also provided for application of a functional nano material in an environmental biotechnology.

The application provides a fluorine-doped Fe-N-C composite material and a preparation method and application and regeneration thereof, and belongs to the technical field of water pollution. In the application, an iron precursor, a zinc salt, an organic ligand and an organic solvent are mixed to synthesize Fe-doped metal organic framework Fe@ZIF-8 material, and then the Fe@ZIF-8 material is carbonized into Fe-N-C material; then the Fe-N-C material is mixed with a fluorine source and subjected to secondary carbonization to obtain the fluorine-doped Fe-N-C composite material. In the application, fluorine atoms are introduced into the Fe-N-C material to produce axial coordination with Fe of the FeN4 center, the fluorine element with high electronegativity can effectively improve the isoelectric point of the Fe-N-C material, the reaction activity of the material is enhanced, the Fe leaching of the material in the reaction process is inhibited, and the stability of the material is improved. In addition, the prepared fluorine-doped Fe-N-C composite material can be reused through fluorine-doping regeneration, and high reduction activity and stability can be maintained.

The invention discloses a composite catalyst as well as a preparation method and application thereof. The composite catalyst comprises carbon nitride, cobalt sulfide and phosphorus. The composite catalyst provided by the invention utilizes the synergistic effect between carbon nitride and cobalt sulfide to regulate the electron and chemical structure of an active center and promote the generation and migration of photo-generated charges at the same time. The surface of the catalyst is modified by phosphorus, so that adsorption and activation of reactants CO2 and H2O molecules can be further promoted. According to the preparation method of the composite catalyst, the synthesis strategy is regulated and controlled, the cobalt sulfide is uniformly dispersed on the carrier, and the reduction activity and stability of carbon dioxide are improved. The catalyst is low in price, the preparation process is simple, the repeatability is good, and large-scale production is easy to carry out.

The invention belongs to the technical field of polymer electrolyte membrane fuel cells, and provides preparation and application of a template-assisted derived electrocatalyst, metal macrocyclic compound self-assembly is performed on the surface of a metal organic framework material to form an ordered aggregate, and then high-temperature heat treatment is performed on the composite to prepare the corresponding electrocatalyst. The electrocatalyst prepared by the method does not form metal-based particles after being subjected to high-temperature heat treatment, so that metal aggregation is effectively avoided, the metal-nitrogen-carbon oxygen reduction active site density is improved, and the electrocatalyst has better oxygen reduction activity and stability in acidic and alkaline electrolytes. The preparation process of the catalyst adopted in the method does not need any acid treatment, the raw materials are rich in source, resources are saved, the cost is reduced, meanwhile, the preparation process of the non-noble metal electrocatalyst is simplified, and the prepared electrocatalyst has high oxygen reduction activity and durability and can be used in the field of polymer electrolyte membrane fuel cells.

The invention discloses an Ag / Cu2O / g-C3N4 heterojunction photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalytic materials. The Ag / Cu2O / g-C3N4 heterojunction photocatalyst is prepared from the following components in percentage by mass: 10 to 30 percent of Cu2O. A g-C3N4 precursor prepared through a solvothermal reaction is fired into a nanotube shape in a tubular furnace, then Ag is generated in situ through heating and stirring, finally the Ag / Cu2O / g-C3N4 heterojunction photocatalyst is synthesized through heating and stirring, and the Ag / Cu2O / g-C3N4 heterojunction photocatalyst can be applied to the field of photocatalytic reduction of CO2. Compared with an existing photocatalyst, the Ag / Cu2O / g-C3N4 heterojunction has good yield and stability, and a strong built-in electric field at the heterojunction interface can accelerate separation and transfer of carriers and enhance adsorption and activation of CO2, so that the activity of photocatalytic reduction of CO2 is enhanced.

The invention discloses a BiOCl / TiO2 photocatalyst prepared by an electrochemical method as well as a preparation method and application thereof, and the preparation method of the BiOCl / TiO2 photocatalyst comprises the following steps: 1) placing a Ti sheet subjected to surface pretreatment in an aqueous solution containing F <-> for anodic oxidation, and then placing the Ti sheet in a muffle furnace for heat treatment to obtain an anatase type TiO2 nanotube; 2) taking the TiO2 nanotube as a working electrode, and obtaining Bi nanocrystals in a water solution containing Bi (NO3) 3 with a certain concentration, lignin calcium benzenesulfonate and an emulsifier OP-10 by adopting a pulse electrodeposition method; 3, the sample with the Bi nanocrystals deposited is subjected to electrooxidation in a Cl <-> solution under the specific pH condition, and the BiOCl / TiO2 photocatalyst is obtained.The BiOCl / TiO2 photocatalyst prepared through the electrochemical method has the advantages of being stable in structure, high in CO2 photocatalytic reduction activity and high in product selectivity.

This invention belongs to the fields of catalytic chemistry and fine chemicals, and discloses a halogen-modified supported noble metal catalyst and its application in the synthesis of oxaragoli key intermediates. The catalyst uses alumina or modified alumina as a support, loads the active component (noble metal), and modifies its surface electronic structure through halide ions. The preparation method includes precursor conversion of the support, impregnation and reduction of the active metal, and post-modification and regulation of halide ions. The catalyst obtained by this invention exhibits excellent hydrogenation reduction activity and selectivity for compounds containing C=N or C≡N bonds under mild conditions. Under room temperature and low-pressure hydrogen conditions, this catalyst can efficiently catalyze the conversion of 2-fluoro-6-trifluoromethylbenzaldehyde oxime to the oxaragoli key intermediate 2-fluoro-6-trifluoromethylbenzylamine, showing promising industrial application prospects.

The invention belongs to the technical field of heavy metal wastewater treatment and environmental restoration, and discloses a method for efficiently reducing and removing hexavalent chromium (Cr (VI)) based on the synergistic effect of a plant-derived soluble organic matter (DOM, a water-soluble organic carbon compound passing through a 0.45-micron filter membrane) and a low-temperature freezing technology. According to the method, the plant source DOM is combined with freezing and thawing cycles for the first time, the reduction activity is enhanced through organic molecule protonation in an acid environment, the local concentration of Cr (VI) and DOM is increased by 10-100 times through low-temperature (lower than or equal to-15 DEG C) freezing, and the reaction rate is increased by 2-3 orders of magnitude. Experiments show that under the conditions that DOM is equal to 15.0 mg / L, pH is equal to 3.0 and freezing and thawing are performed for 2-3 times, the removal rate of Cr (VI) within 30 minutes reaches 99.7%, the efficiency is improved by 75% compared with normal-temperature treatment, and the effluent concentration is lower than 0.5 mg / L. The method does not need additional reagents, utilizes agricultural wastes, has high efficiency, low cost and environmental friendliness, is suitable for chromium-containing wastewater treatment in electroplating, leather making and the like, and has high efficiency, economical efficiency and ecological friendliness.

The invention discloses an aggregation-induced emission photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of preparation of compounds. The structural formula of the aggregation-induced emission photocatalyst is as shown in formula I, wherein R1 is F or Cl; r2 is a diphenylamino group, a substituted diphenylamino group, a triphenylamino group or a substituted triphenylamino group; and R3 is Br, a substituted diphenylamino group, a triphenylamino group or a substituted triphenylamino group. The photocatalyst has visible light absorption, aggregation enhanced luminescence and reduction activity. According to the preparation method, a 4, 7-dibromobenzothiadiazole derivative and aromatic amine are subjected to Buchwald or Suzuki reaction, and the condition is mild. The catalyst is used for metal-free light-operated atom transfer radical polymerization, can efficiently catalyze the polymerization of acrylate monomers under the irradiation of a blue light or green light LED with a low dosage of 5-100 ppm, realizes high conversion rate, narrow distribution and block synthesis, is suitable for an aqueous phase system, and has good biocompatibility and large-scale prospects.

The invention discloses a supported Mn-based catalyst and a preparation method and application thereof, the catalyst takes a Y-type molecular sieve with high crystallinity, large specific surface area and large pore volume as a carrier, and manganese with outstanding low-temperature redox activity, low price and low toxicity is selected as a supported metal. And the catalyst is used for treating VOCs, so that the emission of VOCs is reduced, and toluene is subjected to catalytic oxidation. The manganese element is loaded on the Y-type molecular sieve, the supercage aperture of the Y-type molecular sieve is matched with that of toluene molecules, MnOx can be confined into a highly dispersed cluster of 2-3 nm, sufficient active sites are exposed, and sintering is inhibited; the strong acidity and exchangeable skeleton oxygen cooperate to promote toluene adsorption-activation, the lattice oxygen migration rate is high, the material has good hydrothermal stability and regeneration performance, and long-period operation is guaranteed without inactivation. And the toluene conversion rate of the catalyst can reach 100% within 1 hour under the condition of low load of manganese metal.

The invention discloses a Ba / Ho co-doped lanthanum strontium cobalt-based perovskite cathode material and a preparation method and application thereof, and belongs to the technical field of solid oxide fuel cell cathode materials, the chemical general formula of the Ba / Ho co-doped lanthanum strontium cobalt-based perovskite cathode material is ABO3-delta, A is La, Sr, Ba and Ho; the B site is Co; the molar ratio of the La to the Sr to the Ba to the Ho to the Co is (0.1 to 0.5) to (0.1 to 0.5) to (0.1 to 0.5) to (0.05 to 0.2) to 1; 0 < = [delta] lt; 3. The cathode material obtained by the preparation method of the Ba / Ho co-doped lanthanum strontium cobalt-based perovskite cathode material shows a pure phase of a perovskite structure, and has relatively high oxygen reduction activity, relatively low polarization resistance and excellent Cr and CO2 poisoning resistance.

The application discloses a preparation method of a low-noble-metal heterojunction fuel cell catalyst, which comprises the following steps: (1) preparing Pt-Co alloy nanoparticles; (2) preparing a cobalt acetate ethanol solution, placing the Pt-Co alloy nanoparticles in the cobalt acetate ethanol solution, stirring, growing a cobalt acetate film layer on the outer surface of the Pt-Co alloy nanoparticles, and obtaining the low-noble-metal heterojunction fuel cell catalyst. The preparation method can effectively reduce the use of Pt, reduce the preparation cost of the catalyst, and is suitable for large-scale application. The low-noble-metal heterojunction fuel cell catalyst has high oxygen reduction activity and can effectively improve the catalytic reaction efficiency.

The application belongs to the technical field of catalytic materials, and discloses a preparation method and application of a double cobalt atom catalyst. The target catalyst Co2-DAC is prepared through the steps of mixed liquid preparation, preheating dropwise adding, constant temperature refluxing and post-treatment purifying, and the reaction condition is mild, inert gas protection is not needed, the process is simple, and the cost is relatively low. The prepared catalyst takes double cobalt atoms as the active center, the atoms are uniformly dispersed, and the structure is stable. With the synergistic effect of the double active sites, the charge transport and CO2 activation performance can be improved, the catalyst shows high activity and stability in the photocatalytic CO2 reduction reaction, can effectively convert CO2 into high value-added products, and provides guidance for designing double atom catalysts with high photocatalytic CO2 reduction activity.

The invention relates to a cathode catalyst with a controllable core-shell structure and a preparation method and application thereof, and belongs to the technical field of fuel cell catalysts. The preparation method of the cathode catalyst with the controllable core-shell structure comprises the following steps: dispersing a Fe-N-C inner core in a Tris-HCl buffer solution, adding dopamine hydrochloride DA-HCl, stirring and polymerizing at room temperature, centrifugally collecting a black solid, washing with water for multiple times, and drying a precipitate in a vacuum oven to constant weight to obtain polydopamine PDA coated powder PDA coated Fe-N-C; and pyrolyzing the PDA-coated Fe-N-C powder, and naturally cooling to obtain the cathode catalyst with the core-shell structure. The catalyst prepared by the invention successfully avoids the problem of activity reduction caused by a traditional coating method, and does not significantly hinder the mass transfer process while providing physical protection. The prepared catalyst shows excellent long-term stability in actual fuel cell operation on the basis of maintaining high oxygen reduction activity.

The disclosed technology includes methods of acquiring and trading a cryptocurrency using a pollution reduction system. The system includes a pollution reduction system, a sensor, a computing device, a communications network, and a cryptocurrency system. The method includes detecting a reduction of greenhouse gases (GHGs) produced by the pollution reduction system or an amount of plastics recycled by the plastics emissions system using the sensor responsive to operating the system. The method further includes determining carbon credits earned for the reduction of GHGs produced by the pollution reduction system. or determining plastic credits for the amount of plastics recovered or recycled using a plastics emissions calculation methodology. The method also includes awarding an amount of cryptocurrency corresponding to the reduction of GHGs produced by the pollution reduction system or the amount of plastics recycled by the plastics emissions pollution reduction system.

The invention provides a monatomic doped metal oxygen cluster as well as a synthesis method and application thereof. The molecular formula of the monatomic doped metal oxygen cluster is MBi9O8 [Ti4O (A) 10] [Ti (A) 3] (A) n (B) * xC, in which M represents a doped metal ion; o represents a bridged O atom; a are the same or different and are independently selected from residues of organic acids A; b are the same or different and are independently selected from residues of organic acid B; c is a free molecule, is the same or different, and is independently selected from C1-C20 organic solvents; x is the number of C molecules in a free state and is an integer between 0 and 20. The monatomic doped metal oxygen cluster provided by the invention has efficient and stable activity of photocatalytic carbon dioxide reduction, and can be used in the fields of renewable fuel production, carbon cycle and carbon neutralization, green chemical synthesis, energy storage and energy utilization, solar photoelectrochemical cells and the like.

The invention belongs to the field of catalysis, and particularly relates to preparation of a PSAS (at) PEDOT-x (x = 15, 45, 90) compound formed by coupling organic hybrid silver antimony sulfide [pipH2] 0.5 [Ag2SbS3] (PSAS) and poly 3, 4-ethylenedioxythiophene (PEDOT), and application of the PSAS (at) PEDOT-x (x = 15, 45, 90) compound in photocatalytic reduction of Cr (VI). In the test of photocatalytic reduction of Cr (VI), the prepared three PSAS-coated PEDOT-x compounds all show excellent performance of photocatalytic reduction of Cr (VI). Wherein the reduction rate of the PSAS-coated PEDOT-45 on Cr (VI) (100 mg L <-1 >) within 25 minutes can reach 100%. Tests and analysis prove that the PSAS-coated PEDOT-45 has very strong anion and cation interference resistance and strong adaptive capacity to different water bodies, and the PSAS-coated PEDOT-45 can also show excellent Cr (VI) photocatalytic reduction activity under the irradiation of sunlight, so that the PSAS-coated PEDOT-45 has a good application prospect. The application of the organic hybrid metal sulfide in photocatalytic reduction of Cr (VI) is expanded.

The invention discloses a chemical reduction preparation method of a Pt-loaded PTA (pure terephthalic acid) COFs (covalent organic frameworks) catalyst, and belongs to the field of preparation of covalent organic framework photocatalytic materials. The COF (covalent organic framework) is used as a common crystal organic polymer photocatalyst and has high porosity and specific surface area, however, photo-induced electrons and holes are easy to recombine, and the original COF photocatalytic CO2 reduction activity is poor. A chemical reduction method easy to manufacture is adopted, and the Pt-loaded PTA COFs photocatalytic material is simply produced, so that the performance of photocatalytic reduction of carbon dioxide is improved. The performance of the prepared sample for photocatalytic reduction of CO2 is 120.2970 [mu] mol.g <-1 >. H <-1 >, the catalytic efficiency is basically unchanged through multiple cycle tests, the problem of combination of COFs and a metal catalyst is effectively solved, and the method is suitable for practical application of photocatalytic reduction of CO2.

The invention discloses a biphase mixed type Cu2MoS4 photocatalyst, a preparation method and application, and belongs to the technical field of photocatalysts. The preparation method comprises the following steps: (1) mixing molybdate and thioacetamide, performing ultrasonic dissolution, adding cuprous chloride, stirring and dissolving to obtain a mixed solution; and (2) putting the mixed solution into a high-pressure kettle, and reacting for 5-10 hours at the temperature of 200-260 DEG C, so as to prepare the biphase mixed Cu2MoS4 photocatalyst. The biphase mixed type Cu2MoS4 photocatalyst is synthesized and prepared by adopting a one-step hydrothermal method, the raw materials used for preparation are few in variety, low in price and easy to obtain, the reaction condition is mild, the preparation process is simple, and the requirement for equipment is low. When the prepared catalyst is used for photocatalytic reduction of CO2, the yield of C2H4 is 30.22 [mu] mol / h / g, the yield of CO is 29.73 [mu] mol / h / g, and the catalyst has excellent activity of photocatalytic reduction of CO2.

The invention relates to the technical field of metallurgy, in particular to a method for detecting the kiln sintering index and reduction activity of a coal-based reducing agent. The method for detecting the kiln caking index of the coal-based reducing agent comprises the following steps: crushing the coal-based reducing agent, mixing the crushed coal-based reducing agent with an iron-containing mineral with the mass of m0 to obtain a mixed material, putting the mixed material into a container with the mass of m1, and covering the surface of the mixed material with the coal-based reducing agent; heating the container, carrying out a reduction reaction, cooling, moving out a reduction product in the container, weighing the mass of the reduction product, and recording the mass of the reduction product as m2; the kiln sintering index is equal to (m2-m1) / m0 * 100%. According to the method, the stable iron-containing mineral with the property easy to reduce is selected as the standard, the quality of the reduced bonding residues is used as the judgment index of the kiln caking property, the kiln caking index and the kiln caking possibility of the coal-based reducing agent can be more directly and quantitatively reflected, and the method is easy to operate and high in intuition.

The invention discloses a preparation method and application of a triphenylamine copper coordination polymer film, and belongs to the technical field of electrochromic materials. The preparation method comprises the following steps: taking a redox active ligand 4, 4 ', 4', 4 '- The triphenylamine copper coordination polymer is obtained through an electrochemical deposition method by taking triphenylamine organic matters as an electroactive source and copper ions as coordination metal, and due to a large pi conjugated system and reversible intrinsic oxidation-reduction activity of the triphenylamine organic matters, the triphenylamine copper coordination polymer can be used for preparing a high-purity copper coordination polymer. The prepared triphenylamine copper coordination polymer film has the advantages of high response speed, long cycle life and better electrochromic performance. The triphenylamine copper coordination polymer film is prepared by adopting an electrochemical deposition method, the film is not damaged in the preparation process, the preparation process is simple and easy to implement, and the performance of the film is relatively good.

The invention discloses preparation of a functional SiO2-coated TiO2 composite material with a core-shell structure and a design method for oriented growth of the functional SiO2-coated TiO2 composite material. According to the composite material, an inner core SiO2 is taken as a carrier, and ordered oriented growth of TiO2 on the surface of the inner core SiO2 is realized by regulating and controlling the hydrolysis process of a titanium source precursor, so that a uniform and compact catalyst shell with controllable thickness is formed. According to the structural design, on one hand, the adsorption capacity of carbon dioxide molecules is improved through the high specific surface area and the surface hydroxyl characteristic of SiO2, and on the other hand, the carrier separation efficiency is improved and the specific crystal face exposure degree is enhanced through ordered growth of a TiO2 shell layer, so that the photocatalytic reduction activity and the product selectivity are remarkably improved. The method is simple in process and high in controllability, and the obtained composite material has good stability and application prospects.

The application discloses a high-entropy oxide catalyst and a preparation method and application thereof. The high-entropy oxide containing Ni, Co and Mn is prepared by an oxalic acid coprecipitation method, oxalate and various transition metal ions are efficiently coordinated and precipitated, atomic-level uniform dispersion of metal elements is realized, a stable single-phase spinel structure is formed, and the oxidation-reduction activity, the lattice oxygen migration rate and the surface oxygen vacancy density of the material are greatly improved, and the deep degradation capacity of chlorobenzene is significantly enhanced.

The invention belongs to the technical field of electrochemical catalysis, and discloses a preparation method of an industrial-grade current density carbon dioxide reduction catalyst layer for a pure acid membrane electrode system, and the preparation method comprises the following steps: dissolving a copper salt, a reducing agent and a surfactant in a reaction solvent, and preparing a copper ball template through cosolvothermal for a period of time; then silver salt and a reducing agent are added into the copper ball solution to react for a period of time, and then a dilute acid solution is added to etch copper to obtain multi-cavity structure silver; the cationic polyelectrolyte is coupled with the multi-cavity structure silver catalyst layer to serve as a cathode electrode, the cathode electric field effect is effectively shielded through the cationic polyelectrolyte, H < + > ions near reaction sites are repelled, the multi-cavity structure catalyst can reduce electrolyte flowing, the local pH value of the site surface layer is increased, and the reaction efficiency is improved. The hydrogen evolution reaction is inhibited to a great extent through the synergism of the two, and the electrochemical CO2 reduction activity of an acidic system is enhanced.

The invention discloses a carbon-supported platinum-based high-entropy intermetallic compound HEI-Pt4PdFeCoNi as well as a preparation method and application thereof. The method comprises the following steps: (1) uniformly mixing a platinum-containing precursor, a palladium-containing precursor, an iron-containing precursor, a cobalt-containing precursor, a nickel-containing precursor and a carbon carrier in a solvent, removing the solvent, and drying to obtain a mixture; and (2) the obtained mixture is subjected to reduction and heat preservation in a reducing atmosphere, and the carbon-loaded platinum-based high-entropy intermetallic compound HEI-Pt4PdFeCoNi is obtained. The high-entropy platinum-based intermetallic compound HEI-Pt4PdFeCoNi provided by the invention has an optimal d-band center, and meanwhile, high oxygen reduction activity and high durability stability are achieved under the combined action of a cocktail effect of a high-entropy structure and an ordered structure of the intermetallic compound.

The invention relates to the technical field of heterogeneous photocatalysis, and discloses a photocatalyst interface charge dynamics real-time optimization method based on intelligent molecular surface modification. The photocatalyst is composed of CsPbBr3 and FcCHO, and exists in the form of quantum dots. Wherein the CsPbBr3 quantum dots are subjected to FcCHO intelligent molecule surface modification, and have the basic structural characteristics of the CsPbBr3 quantum dots and the functional characteristics of intelligent molecules. The preparation process of the catalyst is simple and convenient, dynamic cooperative regulation and control can be realized in the full time scale from femtosecond to second, and the exciton dissociation efficiency and the carrier utilization rate are effectively improved, so that the resource conversion capacity of CO2 photocatalytic reduction is remarkably enhanced. Compared with a pure-phase CsPbBr3 catalyst, the CsPbBr3 catalyst has the advantages that the CO2 reduction activity is improved by about 10 times, and a new technical approach is provided for improving the photocatalytic efficiency.

The invention relates to a preparation method of a platinum black catalyst containing a small amount of carbon, and belongs to the technical field of electrochemical catalysts. The method comprises the following steps: dissolving a halogen-containing platinum precursor in a strong acid solution, adding silver ions for reaction, and removing precipitates to obtain a reaction solution; adding a boron-phosphorus co-doped carbon material into the reaction liquid; adjusting the pH of the reaction solution in the presence of a pH buffer agent to convert the platinum species into platinum hydroxide and / or platinum oxide; and then carrying out reduction treatment to obtain the platinum black catalyst containing a small amount of carbon. The functional groups and defect structures on the boron-phosphorus co-doped carbon surface are utilized to guide nucleation and growth of platinum species in the reduction process, and platinum black particles which are small in particle size and uniform in distribution are obtained. The obtained catalyst has relatively low density and remarkably improved dispersity and slurry stability while keeping high platinum loading capacity; compared with pure platinum black, the catalyst provided by the invention shows higher electrochemical activity surface area and enhanced electrochemical reduction activity.

The invention relates to the technical field of photocatalysis, in particular to a monatomic photocatalyst Cu-OmBpy-COF as well as a preparation method and application thereof. The novel OmBpy-COF which is bonded in two connection modes of an imino group and an oxazole ring is synthesized through a one-pot method, and copper metal is anchored into a covalent organic framework through an impregnation method to obtain the monatomic catalyst Cu-OmBpy-COF. Compared with pure OmBpy-COF, the Cu-OmBpy-COF has the advantages that the carrier separation efficiency can be improved, the yield of reducing carbon dioxide into CO through photocatalysis is remarkably enhanced, and the yield of CO is 3815.94 mu mol.g <-1 > under irradiation of a xenon lamp for 5 hours and is 5.4 times that of the pure OmBpy-COF. The anchoring of the metal copper ions increases the adsorption sites of carbon dioxide, improves the reduction activity of carbon dioxide and the selectivity of CO production, greatly improves the yield of carbon monoxide, and has excellent photocatalytic stability.