113results about How to "Excellent electrocatalytic hydrogen evolution performance" patented technology

The invention relates to a nickel foam-loaded silver-doped nickel-based bimetallic hydroxide electrocatalytic hydrogen evolution catalyst and a preparation method thereof. The catalyst takes foam nickel as a carrier, nickel-based bimetallic hydroxide of a laminated structure is uniformly arranged and grows on the surface of foam nickel, and nano-silver particles are uniformly attached to the surface of the nickel-based bimetallic hydroxide. The nickel foam-loaded silver-doped nickel-based bimetallic hydroxide electrocatalytic hydrogen evolution catalyst takes three-dimensional porous foam nickel of a net structure as a carrier, the nickel-based bimetallic is combined with the carrier firmly, distribution is uniform, the catalyst has the good catalytic hydrogen evolution effect under the alkaline condition, and the stable catalytic activity can be kept in a long time.

A preparation method of a molybdenum disulfide-graphite-nickel phosphorus hydrogen evolution composite mainly comprises the steps that firstly, graphite-nickel phosphorus powder is prepared with a chemical composite plating technology and then is subjected to oxidation treatment to carry oxygen-containing functional groups; then, with the graphite-nickel phosphorus powder obtained after oxidation treatment as a carrier, molybdenum disulfide nano-micro-crystals are grown on the surface of the graphite-nickel phosphorus powder, and the molybdenum disulfide-graphite-nickel phosphorus composite is prepared. In preparation of the composite, crystal form transformation from microcrystals and amorphous bodies to nickel phosphide happens to nickel phosphorus alloy, and stripping transformation from a stacked layer structure to a single layer structure happens to molybdenum disulfide. The method is easy and convenient to implement and low in cost, and the prepared molybdenum disulfide-graphite-nickel phosphorus composite has good lubrication performance, wear resistance, corrosion resistance and use stability and also has good electro-catalysis hydrogen evolution performance.

The invention relates to a tripetaloid tungsten sulfide nano-sphere, a preparation method and an application of the nano-sphere. The preparation method includes the steps: (a) dissolving tungstate and thiourea in water to form mixed solution; (b) placing the mixed solution in a high-pressure autoclave, performing hydrothermal reaction at the temperature of 220-250 DEG C, and centrifuging, washing and drying the mixed solution. The weight ratio of the tungstate to the thiourea is 4.2:(1.3-5.3). The preparation process is simple, needed equipment is conventional, raw materials are rich, the price is low, a petal-shaped tungsten sulfide nano electro-catalyst is synthesized at low cost, the prepared petal-shaped tungsten sulfide catalyst has good electro-catalytic stability, and stable electro-catalytic hydrogen evolution activity is still kept after circulation is performed for 40000 seconds.

The invention discloses a preparation method of an electrocatalytic material. The method comprises the following steps: by using foamed nickel as a substrate, sequentially carrying out continuous ultrasonic cleaning with HCl, acetone, ethanol and deionized water, and blow-drying the foamed nickel at room temperature; ultrasonically dispersing a mixed solution of ammonium molybdate tetrahydrate, cobalt nitrate hexahydrate and deionized water into a reaction kettle, keeping the temperature, performing cooling to room temperature, performing cleaning, and blow-drying a sample to obtain a CoMoOx precursor; transferring the cobalt-molybdenum-oxygen precursor sample into a porcelain boat, transferring the porcelain boat into a programmed heating tubular furnace, performing calcining under protective gas, performing cooling to room temperature, and taking out the product to obtain a CoMo/CoMoOx hydrogen evolution electro-catalytic material; according to the method disclosed by the invention,the electro-catalytic hydrogen evolution performance is improved, and the stability is improved; the invention further provides the cobalt-molybdenum oxide hydrogen evolution electro-catalytic material obtained based on the method and a using method of the material.

The invention discloses a molybdenum disulfide/carbon composite hydrogen evolution electro-catalyst and a preparation method thereof, and belongs to the field of electro-catalysis hydrogen evolution.The preparation method comprises the following specific steps that (1) carbon is prepared, specifically, deionized water serves as solvent, a mixed solution of zinc salt and dimethylimidazole is prepared, a metal organic framework material ZIF-8 is prepared, and a carbon material is prepared after high-temperature calcination; and (2) a molybdenum disulfide/carbon composite material is prepared through a hydrothermal method, specifically, deionized water serves as solvent, a mixed solution of sodium molybdate tetrahydrate and thiourea is prepared, the carbon material and the mixed solution ofsodium molybdate tetrahydrate and thiourea are put into a reaction kettle to be subjected to a hydrothermal reaction, and the molybdenum disulfide/carbon composite material is obtained. When the prepared material is used for an electro-catalysis hydrogen evolution reaction, the high catalytic activity and stability are shown, the preparation method is easy to operate, the cost is low, repeatability is high, and the application prospects are broad.

The invention relates to a preparation method of a cobalt-doped rhenium disulfide nanosheet array for electro-catalytic hydrogen evolution. The preparation method comprises the following steps: addingan aqueous 2-methylimidazole solution into an aqueous solution of cobalt nitrate hexahydrate, and immersing a piece of acid-treated carbon cloth into the formed mixed solution; after a reaction for aperiod of time, taking a sample, and cleaning the sample with deionized water; carrying out growing in the same solution for a period of time so as to obtain a ZIF-67 nanoarray sample which is namedas ZIF-67/CC; cleaning and drying the sample; dissolving the cobalt nitrate hexahydrate into a mixed solution of ultrapure water and ethanol, and putting the prepared ZIF-67/CC into the mixed solutionfor hydrolysis to obtain the product cobalt hydroxide nanoarray Co(OH)2/CC; and preparing the product Co-ReS2/CC. The Co-ReS2/CC prepared by using the preparation method disclosed by the invention isapplied to an HER electrocatalyst.

The invention discloses a dimolybdenum carbide/titanium dioxide composite photocatalyst, and a preparation method and an application thereof, and belongs to the technical fields of material preparation and environmental treatment. The preparation method comprises the following steps: preparing Mo2C powder from a molybdenum source and aniline, dissolving the Mo2C powder and titanium(IV) bis(ammonium lactato)dihydroxide in deionized water to prepare a precursor solution, and carrying out a hydrothermal reaction to obtain the Mo2C/TiO2 composite photocatalyst. The composite material prepared by compounding the high-photocatalytic activity nontoxic, harmless and stable TiO2 with Mo2C having a good electrocatalytic hydrogen evolution performance has a large specific surface area, and can increase the contact area and the adsorption amount of CO2; the composite photocatalyst has many surface active centers, so the composite photocatalyst can provide a large and effective active reaction area, and has an excellent photocatalytic CO2 reduction performance; the preparation method has the advantages of simple preparation process, low cost, and easy availability and abundant reserves of raw materials; and the photocatalytic reaction can be carried out only through using solar energy without other energies, and reduction products comprise methane and carbon monoxide and can be used as a fuel, so energy saving and environmental protection are achieved.

The invention discloses a FeNiNC electrode material as well as a preparation method and application of the electrode material. The preparation method comprises the following steps: firstly, mixing ferric nitrate nonahydrate, urea, trisodium citrate and water, and performing hydrothermal reaction on the mixed solution so as to generate colloid; soaking foamed nickel into the colloid, and after soaking is completed, drying the foamed nickel in a vacuum drying oven; and finally performing calcining, thereby obtaining the FeNiNC electrode material. The FeNiNC electrode material disclosed by the invention is of a floppy porous structure similar to the foamed nickel, is low in raw material cost and good in hydrogen separation effect and has the potential of industrial development.

The invention provides a molybdenum disulfide and carbon nanotube composite material catalyst. The preparation method comprises the following steps: by taking deionized water and N, N-dimethylformamide as a solvent, mixing an organic sulfide, a molybdenum salt compound and a carbon nanotube with a molybdenum salt solution and a sulfur source compound, and then adding a carbon nanotube solution, sufficiently and uniformly stirring, carrying out a hydrothermal reaction, carrying out centrifugal separation, respectively washing with water and ethanol, and drying so as to obtain solid powder; andcooling to room temperature to obtain the product. The use method comprises the following steps: adding the catalyst into a sulfuric acid solution, and completing an electrocatalytic hydrogen evolution reaction by taking three electrodes as a working system. According to the prepared electrocatalyst, the interlayer spacing of molybdenum disulfide compounded with the carbon nanotubes is controllably changed, more reaction active sites are exposed, and the electrocatalytic hydrogen evolution performance of molybdenum disulfide is improved; molybdenum disulfide growing on the carbon nanotubes hasa flower-sheet-shaped structure, so that the specific surface area is increased, and excellent adsorption capacity is shown.

The invention discloses a method for preparing a molybdenum disulfide/copper/cobalt catalyzing hydrogen evolution layer on the surface of foam iron, and relates to a method for preparing a flower-like molybdenum disulfide self-assembly layer/electrocoppering layer/replacement cobalt plating layer with good hydrogen evolution activity on the surface of the foam iron to solve the problem that the hydrogen evolution activity of an existing base metal hydrogen evolution catalyst is relatively low in an acid solution. The method for preparing the molybdenum disulfide/copper/cobalt catalyzing hydrogen evolution layer on the surface of the foam iron comprises the first step of preparation of flower-like molybdenum disulfide colloidal fluid, the second step of preparation of cationic polyacrylamide gel, the third step of pretreatment of the foam iron, the fourth step of self-assembly of flower-like molybdenum disulfide on the surface of the foam iron, the fifth step of electrocoppering and the sixth step of replacement cobalt plating, and the complex coating with good catalyzing hydrogen evolution performance is obtained on the surface of the foam iron. The method for preparing the molybdenum disulfide/copper/cobalt catalyzing hydrogen evolution layer on the surface of the foam iron can improve the capacity of electrolytic hydrogen production and reduce the energy loss.

The invention discloses a supported cobalt-doped cerium dioxide nano-sheet preparation method, which specifically comprises: growing cobalt-doped basic cerous carbonate in situ on a matrix material byusing a solvothermal method to obtain a precursor; and calcining the obtained precursor, and thermally stripping to obtain the supported cobalt-doped cerium dioxide nano-sheets. According to the present invention, the two-dimensional sheet-like structure of the non-layered crystal is prepared by using the thermal stripping method, and the defects of poor conductivity and easy agglomeration of thecerium dioxide nanometer material are effectively solved through doping, loading and other basic means; and the supported cobalt-doped cerium dioxide nano-sheets have excellent electrocatalytic hydrogen evolution activity so as to achieve a certain industrial value.

The inventi relates to a monatomic platinum doped nano porous metal compound catalyst and a preparation method and application thereof. According to the micro-dissolution phenomena of platinum counterelectrodes under long-term hydrogen evolution conditions, a cyclic potential method is used for doping monatomic platinum into a nanoporous metal compound to obtain the monatomic platinum doped nanoporous metal compound catalyst. The monatomic platinum doped nano porous metal compound catalyst has the electrocatalytic hydrogen evolution performance comparable to or even surpassing that of a commercial Pt/C catalyst at full pH. The preparation process is simple and controllable, the cost is low, the catalyst is environmentally friendly, large-scale and industrialized product can be achieved,and it shows that the catalyst has a broad application prospect.

The invention provides a three-dimensional (3D) multi-stage structure VS2 hydrogen evolution electrocatalyst and a preparation method thereof. The electrocatalyst has a ball-flower-like spherical structure formed by stacking VS2 nanosheets. The preparation method comprises the steps of soaking a conductive carbon base in dispersoid containing Na3VO4.12H2O, CH3CSNH2 and a polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer (PEO-PPO-PEO) which have a molar ratio of (1-3) to (4-6) to (0.1-0.4), and carrying out a hydrothermal reaction to obtain the 3D multi-stage structure VS2 hydrogen evolution electrocatalyst. The nanosheets prepared by the method grow on a carbon cloth substrate so as to form a nano-flower with a 3D multi-stage structure. The 3D multi-stage structure nano-flower is very beneficial to free in and out of ions so as to expose more active sites, thus improving the electro-catalysis hydrogen evolution performance.

The invention relates to the technical field of electrocatalytic hydrogen evolution, in particular to a MoO2-NiSx/CC hydrogen evolution electrocatalyst and a preparation method thereof. Simple two-step electrodeposition is carried out on a carbon cloth, and then vulcanization is carried out to obtain a MoO2-NiSx/CC composite material. The MoO2-NiSx/CC hydrogen evolution electrocataly has excellentelectrocatalytic hydrogen evolution performance, a long service life at high current density, and shows the application prospects of large-scale production of hydrogen in industrialization.

The invention discloses a preparation method and application of a carbon paper or carbon cloth supported hetero atom-doped molybdenum carbide hydrogen evolution catalyst. The preparation method comprises the following steps: uniformly mixing a molybdenum source, carbon black, an inorganic salt and other doping raw materials, putting carbon fiber paper or carbon fiber cloth treated with a transition metal nitrate and the mixed raw materials into a graphite crucible, placing the graphite crucible in a tube furnace, performing synthesis by using a molten-salt growth method in an inert gas at a low temperature of 800-1100 DEG C, and washing the residual molten salt by using distilled water to obtain the carbon fiber paper or the carbon fiber cloth supported hetero atom-doped synthetic molybdenum carbide hydrogen evolution catalyst. The high-performance low-cost hydrogen evolution catalyst prepared by the method can have excellent performance close to that of a commercial 20% Pt/C catalystwhile maintaining excellent stability under acidic conditions; and the synthetic method proposed by the invention has the advantages of a simple process, economical rationality, environmental friendliness, a controllable morphology and structure and easy large-scale production.

The invention provides a carbon-coated two-dimensional transition metal phosphide and a preparation method thereof, and an application of the carbon-coated two-dimensional transition metal phosphide in the field of electrocatalytic hydrogen evolution. The carbon-coated two-dimensional transition metal phosphide is developed around transition metal base phosphide, the microstructure of the carbon-coated two-dimensional transition metal phosphide is shaped into a porous structure composed of two-dimensional nanosheets through a constant-temperature water bath method at room temperature, and thenthe carbon-coated two-dimensional transition metal phosphide nano composite material is prepared through a gas phase phosphating method. The preparation method of the material has the advantages of simple process, low cost, environmental friendliness and the like; the prepared carbon-coated two-dimensional transition metal phosphide nano composite material has the advantages of large specific surface area, high electron transmission efficiency, good stability and the like, and has a relatively wide application prospect in the field of electro-catalytic hydrogen evolution.

The invention relates to the technical field of electro-catalysis hydrogen production. A preparation method of an aluminum-doped three-dimensional nano-porous metal sulfide hydrogen evolution electrode comprises the steps of heating one or more of cobalt, nickel and ferrum and aluminum to the molten state, cooling to form a rod-shaped alloy ingot, and cutting the alloy ingot into alloy pieces withthe same thickness; carrying out alloy removal treatment on the alloy pieces in an alkaline corrosion solution; and putting in a tubular annealing furnace, putting sulfur powder onto the upstream ofa sample, and enabling sulfur steam and a porous metal sheet to contact and react at high temperature through the airflow drive of protective gas. The invention further relates to an application method of the electrode. The electrode prepared through the invention is remarkably increased in specific surface area, high in hydrogen evolution activity in the acid environment, and excellent in physical chemistry stability, can be directly used as a self-support electrode so as to carry out electro-catalysis hydrogen production, and is suitable for large-scale production.

The invention discloses a preparation method of a cuprous oxide nano material and hydrogen evolution performance of the cuprous oxide nano material, and belongs to the technical field of nanometer materials. According to the preparation method, ethylene glycol and diethylene glycol are used as reducing agents, copper hydroxide and basic copper carbonate with specific morphology are used as coppersources, and the copper hydroxide and the basic copper carbonate copper are reduced to form cuprous oxide nano material with maintained morphology under the protection of inert gas through a gas phasereduction method. The reaction steps are simple and are environmentally friendly, the obtained product does not need to be washed, and a pure cuprous oxide product can be obtained. According to the preparation method provided by the invention, the simple and rapid method is adopted for synthesizing the cuprous oxide nano material with the maintained morphology, and the prepared cuprous oxide nanomaterial has the performance of electro-catalytic hydrogen evolution.

The invention relates to the technical field of electrocatalytic water decomposition, specially to a MoO2-Ni/CC composite material of a hydrogen evolution electrocatalyst, and a preparation method, wherein electro-deposition, hydrothermal reaction and reduction treatment are sequentially performed to obtain the MoO2-Ni/CC composite material. According to the invention, the preparation method is simple; and simple electro-deposition and hydrothermal reaction are performed on a carbon cloth, and then reduction treatment is performed to obtain the MoO2-Ni/CC composite material, wherein the obtained MoO2-Ni/CC composite material has excellent electro-catalytic hydrogen evolution performances under acidic, alkaline and neutral conditions and is long in service life.

The invention discloses a preparation method of a Fe5Ni4S8 hydrogen evolution electro-catalytic material. The method comprises the following specific steps: weighing nano iron powder, nano nickel powder and sulfur powder; adding absolute ethyl alcohol and grinding; uniformly putting the mixture into a mortar and transferring the mortar into a tubular furnace; sealing the pipeline, introducing nitrogen, cleaning the quartz tube for 20 minutes, performing heating to 700 DEG C at a heating rate of 5 DEG C/min, keeping the temperature for 3 hours, performing heating to 1100 DEG C at the same heating rate, keeping the temperature for 10 hours, performing annealing to room temperature, taking out the mixture, uniformly grinding the obtained sample, adding ethanol, and carrying out ball milling for 10 hours by using a planetary ball mill. According to the method, vacuum cladding operation is replaced by nitrogen atmosphere calcination; a quartz ampoule tube and a vacuum sealing machine whichare required by vacuum cladding are not required; and meanwhile, the experiment risk possibly caused by high sulfur pressure is also avoided due to the circulating gas atmosphere, the microcosmic sizeof the sample reaches the nanometer level due to the added ball milling operation after calcination, the active sites on the surface of the sample are increased, and the electro-catalytic hydrogen evolution performance is improved.

The invention relates to the field of electrocatalytic materials, and in particular, relates to an M2C/carbon nanosheet composite material and a preparation method and an application thereof. The composite material comprises a porous carbon nanosheet matrix and M2C particles growing on the porous carbon nanosheet matrix, wherein M is a Mo element and/or a W element. The obtained composite materialcatalyst has a large specific surface area and a large electrochemical active area, and can expose more active sites, so that the electro-catalytic hydrogen evolution capacity of the catalyst is greatly enhanced.

The invention relates to a preparation method of a Co0.1Ni0.75Se/rGO composite material and an application thereof. The preparation method of the composite material comprises the following steps: (1)dispersing graphene oxide in deionized water to from a uniform dispersion liquid A; (2) after uniformly dissolving nickel chloride hexahydrate and cobalt nitrate hexahydrate in deionized water, addingsodium selenite, slowly adding an ethanol amine solvent and hydrazine hydrate into the solution successively, and uniformly stirring the solution to obtain a mixed solution B; and (3) slowly adding the dispersion liquid A into the mixed solution B to be uniformly stirred and transferring the mixture to a reaction kettle, sealing the reaction kettle, putting the reaction kettle in an electric heating blowing drying box, heating the reaction kettle to 140 DEG C, carrying out a constant temperature reaction for 24 h, and centrifugalizing and washing the obtained product to prepare the compositematerial. By adopting a one-step hydrothermal method, the Co0.1Ni0.75Se/rGO composite material is synthesized controllably, and the product prepared by the method is excellent in electrochemical property and can be used for an electrocatalytic hydrogen evolution catalyst.

The invention relates to a cobalt (II) metal organic framework material with electro-catalytic hydrogen evolution performance and a performance test method of the cobalt (II) metal organic framework material serving as an electro-catalytic hydrogen evolution catalyst. The cobalt chloride hexahydrate and 1,3,5-trimethyl-2, 4, 6-tricarboxyl phenyl benzene (H3TMTA) are mainly used as main synthesis raw materials, a blue blocky crystalline product is obtained through a solvothermal method, and the molecular formula of the product can be expressed as [Co2(TMTA)(DMF)(H2O)3].Cl. The blue crystallinematerial is subjected to washing, drying and grinding, and uniform ultrasonic treatment is carried out on the blue crystalline material and Nafion to obtain the electro-catalytic hydrogen evolution material. The preparation method of the material is relatively simple; material yield is high, the obtained catalyst has relatively good water electrolysis hydrogen evolution capability; according to the present invention, the hydrogen evolution potential is 283 mV under the condition of the current density of 10 mA/cm<2>, such that the good electro-catalysis performance is provided, and the certainreference value is provided for the development of the field of the novel electro-catalysis hydrogen evolution catalyst.