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31results about How to "Improve photocatalytic hydrogen production efficiency" patented technology

Nickel single-active site graphite-phase carbon nitride-based photocatalytic material as well as preparation method and application thereof

The invention relates to a Nickel single-active site graphite-phase carbon Nitride-based photocatalytic material as well as a preparation method and application thereof, in the photocatalytic material, Ni is dispersed in a g-C3N4 framework in a single-atom-level degree to form active sites, and the molar content of the Ni is 1-5%. the nickel single-active site graphite-phase carbon nitride-based photocatalytic material has a large specific surface area, is good in dispersion in an aqueous solution, and can effectively inhibit the recombination of photo-generated carriers, the reaction activitysites of the surface of the g-C3N4 are increased, the photocatalytic hydrogen production efficiency can be remarkably improved, and the photocatalytic reaction activity of the g-C3N4 can be improved.
Owner:SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI

Doped quantum dot catalyst, preparation method thereof, hydrogen production system comprising doped quantum dot catalyst, and hydrogen production method

The invention discloses a quantum dot catalyst doped with metal ions. The catalyst includes a light-harvesting unit and a catalyzing unit, wherein the light-harvesting unit includes one, two or several kinds of quantum dots, and the catalyzing unit comprises the metal ions doped in the quantum dots. The metal ions are dispersed on the quantum dots in the following one or several manners that: (1) the metal ions are adhered to the surface of the quantum dots; (2) the metal ions are uniformly dispersed in the quantum dots; (3) the metal ions are disposed in the quantum dots in a gradient alloy way; (4) the metal ions are merely disposed on cores of core-shell quantum dots; (5) the metal ions are merely disposed on shells of the core-shell quantum dots; (6) both the cores and shells of the core-shell quantum dots are doped with the metal ions. The invention further discloses a photocatalytic hydrogen production system of doped quantum dots. The system has high efficiency of a quantum-dot-catalyst photocatalytic hydrogen production system and simplicity of a single quantum-dot photocatalytic hydrogen production system. The system can conveniently combine with an oxygen production half-reaction to totally decompose water.
Owner:TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI

Photocatalytic water-splitting hydrogen production material CdS/Sr1.6Zn0.4Nb2O7 and preparation method thereof

A photocatalytic decomposing water hydrogen production material CdS / Sr1.6Zn0.4Nb2O7 is a catalyst having a heterojunction structure formed by loading CdS on Sr1.6Zn0.4Nb2O7. The inventive catalyst is prepared by a hydrothermal method through sol gel. When a molar ratio of the CdS and the Sr1.6Zn0.4Nb2O7 is 3:7, the expression is 30%CdS / Sr1.6Zn0.4Nb2O7, and the catalytic effect of the material is best. Under the illumination of a 300 watt xenon lamp, Na2S / Na2SO3 is taken as a sacrifice reagent, the inventive material 30%CdS / Sr1.6Zn0.4Nb2O7 photocatalyzes and decomposes the water to produce the hydrogen without a co-catalyst of noble metal, and the efficiency is 645.7 mu mol.h<-1>.g<-1>. The photocatalytic decomposing water hydrogen production material of the invention has the advantages that: 1 the inventive catalyst is directly synthesized by the hydrothermal method through sol gel, the operation is simple, the production cost is low, the synthetic yield is higher, the purity is high and the repeatability is good, and the inventive catalyst is suitable for the demand of magnification production; 2, the inventive catalyst is good in the stability and is easy to reuse; and 3, the inventive catalyst has higher photocatalytic hydrogen production efficiency.
Owner:NANCHANG HANGKONG UNIVERSITY

Platinum/titanium dioxide nano flower composite material as well as preparation method and application thereof

The invention discloses a method for preparing a platinum / titanium dioxide nano flower composite material. The platinum / titanium dioxide nano flower composite material is prepared from titanium dioxide nanoflowers and platinum nanoparticles through compounding, and the titanium dioxide nanoflowers are adopted to provide a large specific area and are rich in oxygen vacancy. By virtue of the property that the oxygen vacancy has reducibility, the platinum nanoparticles are uniformly deposited to the surface of the titanium dioxide nanoflowers, and the platinum nanoparticles and the titanium dioxide nanoflowers are in tight interface contact. The platinum / titanium dioxide nano flower composite material prepared by using the method is an efficient and stable photoelectric converting material, aone-step simple reduction method is implemented, a platinum ion reduction process does not involve any reducing agents, and the preparation method is simple to operate, environmental-friendly, gentlein reaction condition, low in energy consumption and easy to popularize and use.
Owner:ZHEJIANG UNIV CITY COLLEGE

Method for preparing zinc oxide/zinc sulfide nano heterojunction photocatalyst

The invention provides a method for preparing a zinc oxide / zinc sulfide nano heterojunction photocatalyst. The catalyst is a heterojunction catalyst formed by loading ZnO to ZnS, and is formed through a two-step calcination method employing MOF-5 as a template, and an expression of the catalyst is ZnOS-x when ZnS-C is calcined in air for x minutes. The method has the advantages that (1) a heterojunction is firstly prepared by adopting a metal-organic frame complex as the template, and the catalyst prepared by the method compared with the prior art can reach a nanoscale and can be synthesized on a large scale; (2) the prepared catalyst is high in photocatalytic hydrogen production efficiency in visible light under the condition of not needing any co-catalyst; and (3) the prepared catalyst is good in stability and repeated utilization is facilitated.
Owner:NANKAI UNIV

Titanium dioxide-platinum-tricobalt tetraoxide tri-element composite photocatalytic material and preparation method thereof

The invention relates to a titanium dioxide-platinum-tricobalt tetraoxide tri-element composite photocatalytic material and a preparation method thereof.Titanium dioxide nanosheets with exposed faces {001} and {101} are used as a carrier, platinum and tricobalt tetraoxide nanoparticles are used as a co-catalyst, the platinum particles are loaded on the faces {101} of the titanium dioxide nanosheets, and the tricobalt tetraoxide nanoparticles are loaded on the faces {001} of the titanium dioxide nanosheets.Photocatalytic decomposing water of the material is high in hydrogen generating efficiency, and the co-catalyst and titanium dioxide are combined closely, so that the material is high in stability after long-time use and the problem that photocatalytic efficiency is lowered caused by the fact that photocatalyst electron holes are highly prone to compositing in the prior art is solved effectively.
Owner:WUHAN UNIV OF TECH

Adsorption photocatalytic hydrogel material and application thereof in synergistic photocatalytic sewage hydrogen generation capable of reversing heavy metal pollution

The invention relates to an adsorption photocatalytic hydrogel material and an application thereof in synergistic photocatalytic sewage hydrogen generation capable of reversing heavy metal pollution. The adsorption photocatalytic hydrogel material comprises a photocatalytic nano material and a porous transparent matrix for loading the photocatalytic nano material. The porous transparent matrix is prepared from a polysaccharide polymer material, which carry out crosslinking easily to form hydrogel. The polysaccharide hydrogel is rich in functional groups such as -OH, -NH3, and the like, can absorb heavy metal ions, and reduces the concentration of heavy metal ions in sewage.
Owner:SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI

Preparation method and application of modified material based on titanium dioxide

The invention belongs to the technical field of materials, and provides a preparation method and application of a modified material based on titanium dioxide, which comprises the following steps: dissolving a certain amount of boric acid and rhodium chloride trihydrate in water containing nitric acid and alcohol to obtain a solution A; dropwise adding isopropyl titanate into the ethanol solution at the temperature of 0-4 DEG C to obtain a solution B; slowly dropwise adding the solution A into the solution B to obtain titanium dioxide sol; aging the titanium dioxide sol at room temperature, andperforming drying to obtain xerogel; and finally, grinding the dry gel into powder, and calcining the powder in air for 4 hours to obtain the boron-rhodium co-doped titanium dioxide, namely the titanium dioxide-based modified material. The material is used for photocatalytic hydrogen production, and the catalytic hydrogen production efficiency is effectively improved. The boron-rhodium co-doped titanium dioxide is prepared by adopting a one-pot sol-gel method, the absorption bandwidth of the titanium dioxide can be regulated and controlled by adjusting the rhodium doping proportion, and the light absorption and carrier separation efficiency is improved.
Owner:SHANGHAI UNIVERSITY OF ELECTRIC POWER

Composite photocatalyst and preparation method thereof

The invention discloses a composite photocatalyst and a preparation method thereof, and belongs to the field of photocatalysis. The composite photocatalyst comprises a MoS2 nanosheet and an II type CdSe / CdTe quantum well adsorbed to the MoS2 nanosheet, wherein the II type CdSe / CdTe quantum well comprises a CdSe quantum chip nuclear layer and a CdTe quantum chip shell layer. The composite photocatalyst has the advantages of high light absorption efficiency, high separation efficiency of interfacial charge, weak recombination action of the interfacial charge, high quantum yield of photocatalytichydrogen production and the like. The preparation method of the composite photocatalyst comprises the following steps: dropwise adding first reaction liquid containing the MoS2 nanosheet into secondreaction liquid containing the II type CdSe / CdTe quantum well and carrying out ultrasonic dispersion to obtain the composite photocatalyst. The preparation method has the advantages of good controllability, low cost and wide application range; the prepared photocatalyst has high light absorption efficiency and high hydrogen production efficiency.
Owner:HUBEI UNIV OF ARTS & SCI

Graphite phase carbon nitride foam photocatalytic material and preparation method thereof

The invention relates to a graphite phase carbon nitride foam photocatalytic material and a preparation method thereof. The preparation method includes adding 5-14 parts by mass of graphite phase carbon nitride to 100 parts by mass of deionized water, mixing, further adding 1.7-2.0 parts by mass of sodium dodecyl sulfate, 1.7-2.0 parts by mass of dodecyl alcohol and 1.7-2.0 parts by mass of resingum and stirring at 40-60 DEG C and 100-200 r / min for 10-20 minutes to obtain a mixed solution; stirring the mixed solution at 1500-2000 r / min for 15-20 min, then adding 5-14 parts by mass of binder and continuing stirring for 5-10 min to obtain graphite phase carbon nitride foam slurry; molding the graphite phase carbon nitride foam slurry by casting, freeze drying for 6-12 hours, and drying at 80-100 DEG C for 18-24 hours to obtain the graphite phase carbon nitride foam photocatalytic material. The preparation method has simple process and low cost. The prepared graphite phase carbon nitridefoam photocatalytic material has high photocatalytic hydrogen production efficiency.
Owner:WUHAN UNIV OF SCI & TECH

Preparation method and application of silicon carbide-based photocatalyst

The invention discloses a silicon carbide-based double-additive hydrogen producing photocatalyst and a preparation method thereof. The preparation method comprises the following steps of a, performingpretreatment on silicon carbide; b, by taking molybdenum disulfide as a raw material, preparing 8 wt% molybdenum disulfide suspension liquid of a whole hydrothermal reaction system; c, putting 100 mLof 8 wt% molybdenum disulfide suspension liquid in a beaker, sequentially adding silicon carbide (SiC), graphene oxide (GO) and two drops of 1-butyl-3-methylimidazolium hexafluorophosphate ionic liquid, and performing ultrasonic stirring to enable the components to be uniformly mixed; and d, transferring the mixture into a high-temperature reaction kettle, performing reaction for 20 h at the temperature of 220 DEG C, then performing centrifugal washing until a pH value is 7, putting the product in a vacuum drying tank, performing vacuum drying for later use, and performing hydro-thermal synthesis to obtain the silicon carbide-based double-additive hydrogen producing photocatalyst. According to the preparation method provided by the invention, for the silicon carbide-based double-additivehydrogen producing photocatalyst prepared by utilizing the synergistic effect of GO-molybdenum disulfide (MoS2) double-additive catalyst, the performance of photocatalytically decomposing water with visible light to produce hydrogen is improved, and a certain foundation can be laid for subsequent efficient application of a visible light catalyst.
Owner:SHANDONG UNIV OF SCI & TECH

Graphene quantum dot modified manganese oxide/titanium oxide nanotube array material and preparation method and application thereof

InactiveCN109794234ABroaden the absorbing boundaryAbsorption Boundary ExtendedHydrogen productionMetal/metal-oxides/metal-hydroxide catalystsWater bathsTio2 nanotube
The invention provides a graphene quantum dot modified manganese oxide / titanium oxide nanotube array material and a preparation method and application thereof, and belongs to the field of photocatalysis of film materials. A titanium dioxide material is composited and modified through graphene quantum dots and manganese oxide; compared with titanium dioxide materials, the titanium dioxide materialmodified with quantum dots have improved electrochemical properties; the compositing with manganese oxide enables absorbing boundary of titanium dioxide to be widened, forbidden band width of titaniumdioxide can be evidently decreased, the absorbing boundary is extended, titanium dioxide can utilize visible light more efficiently, compositing of photo-induced electrons and holes is inhibited, photocatalytic activity of titanium dioxide is improved, and hydrogen can be produced by photoelectric catalysis of titanium dioxide more efficiently; in addition, reduced graphene oxide and titanium sheeting are nontoxic and pollution free, the cost is low, and the preparation method has the advantages of simplicity, convenience and high speed; the morphology and properties are controlled by controlling reaction voltage and time and water bath reaction time, and the operation is simple.
Owner:HEFEI UNIV OF TECH

Preparation method of gold-iron oxyhydroxide-cuprous oxide-copper sulfide composite paper

The invention discloses a preparation method of gold-iron oxyhydroxide-cuprous oxide-copper sulfide composite paper. The preparation method comprises the following steps of: growing a layer of gold nanoparticles on the surface of a paper chip to obtain a gold paper electrode; sequentially depositing iron oxyhydroxide and cuprous oxide on the surface of the gold paper electrode by utilizing an electro-deposition method; and finally, coating the surface of the cuprous oxide with copper sulfide through a continuous ion layer adsorption and reaction method, so as to obtain the gold-iron oxyhydroxide-cuprous oxide-copper sulfide composite paper. The iron oxyhydroxide and copper sulfide are used as cocatalysts, so that separation and transfer of photogenerated charges of the cuprous oxide can beeffectively accelerated, the photostability of the cuprous oxide is enhanced, and the photocatalytic hydrogen production performance of the cuprous oxide is greatly improved. The composite paper is rich in raw material source, simple in preparation method and suitable for mass production, and has high application value in the field of photocatalytic hydrogen production.
Owner:UNIV OF JINAN

Material CdS/Ba0.4Sr0.6TiO3 for producing hydrogen by photocatalytically decomposing water and preparation method thereof

The invention relates to a material CdS / Ba0.4Sr0.6TiO3 for producing hydrogen by photocatalytically decomposing water, which is a heterostructure catalyst formed by supporting CdS onto Ba0.4Sr0.6TiO3. The catalyst is prepared by a one-step hydrothermal process. When the mole ratio of the CdS to the Ba0.4Sr0.6TiO3 is 0.4:1, the expression is 40%CdS / Ba0.4Sr0.6TiO3, and the material has the optimal catalytic effect. Under simulated sunlight, by using Na2S / Na2SO3 as a sacrifice reagent, the hydrogen production efficiency by photocatalytically decomposing water of the 40%CdS / Ba0.4Sr0.6TiO3 is up to 1268.4 mu mol.h<-1>.g<-1> under the condition of no noble metal for cocatalysis. The one-step hydrothermal process is directly used for synthesizing the catalyst, is simple to operate, has the advantages of low production cost, higher synthesis yield, higher purity and favorable repetitiveness, and is suitable for the requirement for scale-up production; the catalyst has high stability and is convenient for reutilization; and the catalyst has very high photocatalytic hydrogen production ratio under simulated sunlight.
Owner:NANCHANG HANGKONG UNIVERSITY

Preparation method and application of molybdenum disulfide/boron-doped graphite-phase carbon nitride composite visible light photocatalyst

The invention discloses a preparation method and application of a molybdenum disulfide / boron-doped graphite-phase carbon nitride composite visible light photocatalyst, wherein boron-doped graphite-phase carbon nitride is prepared by reacting and sintering urea and sodium tetraphenylborate (PH4BNa), and molybdenum disulfide is prepared by a hydrothermal method. According to the invention, boron-doped graphite-phase carbon nitride photocatalyst is compounded with proper molybdenum disulfide to prepare an efficient catalyst, wherein the boron-doped graphite-phase carbon nitride has high specificsurface area and chemical stability, and molybdenum disulfide can accelerate separation of photo-excited electron hole pairs in boron-doped graphite-phase carbon nitride, so that excellent catalytic activity is achieved, the photocatalytic hydrogen production efficiency of the molybdenum disulfide / boron-doped graphite-phase carbon nitride photocatalyst is improved, and the photocatalyst has potential application value in the aspect of coping with energy crisis.
Owner:NANCHANG HANGKONG UNIVERSITY

Preparation method and application of visible light response hydrogen generation photocatalyst GO/SiC/WO3

The invention discloses a preparation method and application of a visible light response hydrogen generation photocatalyst GO / SiC / WO3. The preparation method comprises the following steps: a, siliconcarbide (SiC) is pretreated; b, tungsten trioxide (WO3) is taken as a raw material to prepare a 8wt% WO3 solution of a whole hydrothermal reaction system; c, 100 mL of the 8wt% WO3 solution is taken and placed in a beaker, and the SiC, graphene oxide (GO) and two drops of 1-butyl-3-methylimidazolium hexafluorophosphate ionic liquid are sequentially added, and ultrasonically stirred to be evenly mixed; and d, the mixture is transferred into a high-temperature reaction kettle to react for 20 h at 200 DEG C, then centrifugal washing is conducted till the pH is 7, the mixture is placed in a vacuumdrying box to be subjected to vacuum drying for standby application, and the visible light response hydrogen generation photocatalyst GO / SiC / WO3 is obtained through hydrothermal synthesis. Through the synergistic effect of the double cocatalysts, namely the graphene-like material GO and the non-graphene-like material WO3, and the amphipathicity of the ionic liquid, the visible light response hydrogen generation photocatalyst GO / SiC / WO3 is prepared, the performance of visible light photocatalytic water decomposition for hydrogen generation is improved, and a certain foundation can be laid forsubsequent efficient application of the visible light catalyst.
Owner:SHANDONG UNIV OF SCI & TECH

Doped quantum dot catalyst and preparation method thereof, hydrogen production system and hydrogen production method comprising doped quantum dot catalyst

The invention discloses a quantum dot catalyst doped with metal ions. The catalyst includes a light-harvesting unit and a catalyzing unit, wherein the light-harvesting unit includes one, two or several kinds of quantum dots, and the catalyzing unit comprises the metal ions doped in the quantum dots. The metal ions are dispersed on the quantum dots in the following one or several manners that: (1) the metal ions are adhered to the surface of the quantum dots; (2) the metal ions are uniformly dispersed in the quantum dots; (3) the metal ions are disposed in the quantum dots in a gradient alloy way; (4) the metal ions are merely disposed on cores of core-shell quantum dots; (5) the metal ions are merely disposed on shells of the core-shell quantum dots; (6) both the cores and shells of the core-shell quantum dots are doped with the metal ions. The invention further discloses a photocatalytic hydrogen production system of doped quantum dots. The system has high efficiency of a quantum-dot-catalyst photocatalytic hydrogen production system and simplicity of a single quantum-dot photocatalytic hydrogen production system. The system can conveniently combine with an oxygen production half-reaction to totally decompose water.
Owner:TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI

Preparation method of a nitrogen-containing carbon quantum dot/graphite phase carbon nitride composite photocatalyst

ActiveCN107376967BOvercome the shortcomings of extraction and separation difficultiesImprove photocatalytic hydrogen production efficiencyPhysical/chemical process catalystsHydrogen productionSolventIonic liquid
The invention belongs to the technical field of photocatalytic composite materials, and particularly relates to a preparation method of a nitrogen-containing carbon quantum dot / graphite phase carbon nitride composite photocatalyst: using glucose and glycine as carbon precursors and nitrogen precursors, and using a high-speed ball milling method to synthesize Nitrogen-containing carbon quantum dots; graphite-phase carbon nitride is prepared by hydrothermal method; using hydrophilic ionic liquid as solvent, nitrogen-containing carbon quantum dots and graphite-phase carbon nitride are combined through an acylation reaction to prepare nitrogen-containing carbon Quantum dot / graphite phase carbon nitride composite photocatalyst, nitrogen-containing carbon quantum dots and graphite phase carbon nitride are combined by covalent bonds.
Owner:CHANGZHOU UNIV

Preparation method of gold-iron oxyhydroxide-cuprous oxide-copper sulfide composite paper

The invention discloses a preparation method of gold-iron oxyhydroxide-cuprous oxide-copper sulfide composite paper. First, a layer of gold nanoparticles is grown on the surface of a paper chip to obtain a gold paper electrode; Iron oxyhydroxide and cuprous oxide were deposited on the surface in sequence; finally, copper sulfide was coated on the surface of cuprous oxide by continuous ion layer adsorption and reaction method to obtain gold-iron oxyhydroxide-cuprous oxide-copper sulfide composite paper. Iron oxyhydroxide and copper sulfide as cocatalysts can effectively accelerate the separation and transfer of photogenerated charges of cuprous oxide, thereby enhancing the photostability of cuprous oxide and greatly improving its photocatalytic hydrogen production performance. The composite paper has rich sources of raw materials, simple preparation method, is suitable for mass production, and has high application value in the field of photocatalytic hydrogen production.
Owner:UNIV OF JINAN

Photocatalytic water-splitting hydrogen production material CdS/Sr1.6Zn0.4Nb2O7 and preparation method thereof

A photocatalytic decomposing water hydrogen production material CdS / Sr1.6Zn0.4Nb2O7 is a catalyst having a heterojunction structure formed by loading CdS on Sr1.6Zn0.4Nb2O7. The inventive catalyst is prepared by a hydrothermal method through sol gel. When a molar ratio of the CdS and the Sr1.6Zn0.4Nb2O7 is 3:7, the expression is 30%CdS / Sr1.6Zn0.4Nb2O7, and the catalytic effect of the material is best. Under the illumination of a 300 watt xenon lamp, Na2S / Na2SO3 is taken as a sacrifice reagent, the inventive material 30%CdS / Sr1.6Zn0.4Nb2O7 photocatalyzes and decomposes the water to produce the hydrogen without a co-catalyst of noble metal, and the efficiency is 645.7 mu mol.h<-1>.g<-1>. The photocatalytic decomposing water hydrogen production material of the invention has the advantages that: 1 the inventive catalyst is directly synthesized by the hydrothermal method through sol gel, the operation is simple, the production cost is low, the synthetic yield is higher, the purity is high and the repeatability is good, and the inventive catalyst is suitable for the demand of magnification production; 2, the inventive catalyst is good in the stability and is easy to reuse; and 3, the inventive catalyst has higher photocatalytic hydrogen production efficiency.
Owner:NANCHANG HANGKONG UNIVERSITY
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