32results about How to "Improve hydrogen evolution catalytic activity" patented technology

The invention relates to a nitrogen-phosphorus double-doped carbon-coated transition metal diphosphide hydrogen evolution catalyst and a preparation method thereof. The nitrogen-phosphorus double-doped carbon-coated transition metal diphosphide is characterized in that the structural formula is MP2@NPC, a transition metal diphosphide MP2 is used as a core, nitrogen-phosphorus double-doped carbon NPC is used as a shell so that a core-shell structure is formed, the diphosphide has a nano-particle structure, the particle size is less than 50nm and good crystallinity is obtained. The composite catalyst has the electrocatalytic hydrogen evolution activity similar to that of the commercial platinum carbon and catalyst stability better than that of the commercial catalyst. The catalyst has a wide application prospect.

The present invention is structure, composition and manufacture of electrically catalytic hydrogen separating electrode. The structure of the electrically catalytic hydrogen separating electrode consists of fluid collecting layer and catalyzing layer compounded together. The catalyzing layer has mixed catalyst powder and adhesive, and may have also conducting powder. The electrically catalytic hydrogen separating electrode in completely new structure has the features of high hydrogen separating catalyzing activity, stable performance, long service life, etc. and may be used widely in chloralkali industry, water electrolyzing industry, solar water electrolyzing hydrogen production, electrochemical hydrogen storing, hydrogen making system, etc.

The invention discloses a preparation method and application of an MoS2/transition metal/graphene composite hydrogen dissociation electrode in a microbial electrolytic tank. The preparation method comprises the following steps: (1) dissolving graphene oxide with deionized water, performing ultrasonic peeling to obtain a graphene oxide solution, then, adding ammonium tetrathiomolybdate, a salt compound of transition metal and a reducing agent in sequence, and dispersing uniformly to obtain a mixed solution; (2) transferring the mixed solution into a reaction kettle, preserving heat for 10 to 12hours at 170 to 200 DEG C, and centrifuging, washing and drying a product to obtain the MoS2/transition metal/graphene composite hydrogen dissociation catalyst; (3) uniformly loading an electrode material with the MoS2/transition metal/graphene composite hydrogen dissociation catalyst to obtain the hydrogen dissociation electrode. According to the preparation method and the application of the MoS2/transition metal/graphene composite hydrogen dissociation electrode in the microbial electrolytic tank, a reaction system is uniform; the production cost is low; the MoS2/transition metal/graphene composite hydrogen dissociation electrode has good electrochemical performance, has a good catalytic hydrogen production effect, and can achieve double effects of treating pollution and producing energy.

The invention discloses an N-doped porous carbon-coated MoP nanorod material, and a preparation method and application thereof. The preparation method of the N-doped porous carbon-coated MoP nanorod material comprises the following steps: 1) performing a contact reaction on MoO3 nanorods, a surfactant, a zinc source and dimethylimidazole in a solvent to prepare precursor powder; and 2) calcining and carbonizing the precursor powder under protective gas, and then performing phosphating treatment on the calcined and carbonized product to obtain the N-doped porous carbon-coated MoP nanorod material. The N-doped porous carbon-coated MoP nanorod material has excellent catalytic activity, so the N-doped porous carbon-coated MoP nanorod material can be applied to HER electrocatalysis; and meanwhile, the preparation method has the advantages of simplicity in operation and uniform and controllable morphology.

The invention discloses a photo-electrochemical hydrogen evolution electrode based on a MoS2 and Ag modified silicon nanowire array and a three-electrode system and an application thereof. The photo-electrochemical hydrogen evolution electrode based on the MoS2 and Ag modified silicon nanowire array comprises a silicon nanowire array, a Ag nano-granule layer and a MoS2 nano-granule layer with a charge transfer function, wherein the silicon nanowire array is prepared from a two-step metal-assisted catalysis electroless etching method; the MoS2 nano-granule layer is compounded on the surface of the silicon nanowire array modified by the Ag nano-granule layer by a thermal decomposition technology. By means of increasing the Ag in the MoS2 modified silicon nanowire array as a charge transfer medium, the charge transfer of the solid-solid interface is increased, so that more photo electrons for the hydrogen reduction reaction on the MoS2 can be provided, the participation probability of the photo electrons in the hydrogen reduction reaction is greatly increased and the energy conversion efficiency is increased, and the three-electrode system is constructed for industrial water decomposition to obtain the hydrogen energy.

The invention discloses a preparation method of a Ni-Fe-Mo-Cu porous material. The preparation method comprises the following steps: uniformly mixing powder with the granularity of 3 to 10mu m of fourtypes of high-purity elements including Ni, Fe, Mo and Cu according to the mass percent ratio of 15 to 35 percent of the Fe, 1 to 8 percent of the Mo, 1 to 7 percent of the Cu and the balance of theNi, and drying; then doping stearic acid and pressing and molding to obtain a green body; carrying out vacuum sintering on the green body by utilizing a solid-phase partial diffusion principle to prepare the Ni-Fe-Mo-Cu porous material. The porous material prepared by the preparation method has the advantages of abundant and uniformly-distributed pores, relatively high specific surface area and mechanical strength, relatively low hydrogen evolution overpotential and relatively good corrosion resistance property and chemical stability; a preparation technology is simple and environmentally friendly, has potential application value in the fields of electrolysis hydrogen evolution and industrial filtering and has great significance.

The invention provides a preparation method for molybdenum disulfide/graphitized carbon composite material, a catalyst and a preparation method thereof. The preparation method for molybdenum disulfide/graphitized carbon composite material comprises the following steps: performing a hydrothermal synthesis reaction on a sulfur-containing reducing agent, molybdate and ascorbic acid; sintering a product of the hydrothermal synthesis reaction to obtain the molybdenum disulfide/graphitized carbon composite material. The catalyst is prepared from the molybdenum disulfide/graphitized carbon compositematerial, the molybdenum disulfide/graphitized carbon composite material is prepared from molybdenum disulfide being of a layer structure and graphitized carbon inserted into adjacent layers of the layer structure. According to the preparation method for the catalyst applied to electrochemical hydrogen evolution, the prepared molybdenum disulfide/carbon composite material, is taken as the catalyst. The preparation method has the advantages of readily-available raw material, simple synthesis process, capability of preparing the molybdenum disulfide/carbon composite material which has high conductivity and catalytic property.

The invention provides a Ni-S-W-C hydrogen evolution electrode comprising a nickel base body and a Ni-S-W-C coating layer deposited on the surface of the nickel base body. The Ni-S-W-C coating layer comprises, by weight, 50%-80% of Ni, 5%-20% of S, 0.1%-1.5% of W and the balance C. The W and C elements are added to a Ni-S coating layer to form the Ni-S-W-C coating layer. The Ni-S-W-C coating layer has low hydrogen evolution over potentiality, high hydrogen evolution catalytic activity and excellent stability and can be widely used as an alkaline water electrolysis hydrogen evolution electrode material. According to the embodiment, the Ni-S-W-C hydrogen evolution electrode provided by the invention has the hydrogen evolution over potentiality being 270mV, the apparent current density being 5.27x10<2> mA/cm<2>, and has higher hydrogen evolution catalytic activity.

The invention discloses a manufacturing method of an Ni-Cr-Al-Cu porous material. The manufacturing method comprises the steps that a powder reaction synthesis method is adopted, and high-purity Ni powder, high-purity Cr powder, high-purity Al powder and high-purity Cu powder are prepared in a certain ratio, wherein the total content of the Cr powder, the Al powder and the Cu powder is 22wt%-45wt%of the total content; after the prepared powder is uniformly mixed and dried, stearic acid is added, and drying is conducted again; pressure forming is conducted, so that a green blank is obtained; and vacuum sintering is conducted on the green blank by the use of the solid phase partial diffusion principle, so that the Ni-Cr-Al-Cu porous material is manufactured. The porous material manufacturedaccording to the manufacturing method has the low hydrogen evolution overpotential, the large specific surface area, excellent corrosion resistance, good catalytic performance and stable working performance, and a manufacturing technology of the porous material is simple and environmentally friendly, has the potential application value in the fields of hydrogen electrolysis evolution and industrial filtering, and has an important significance.

The invention provides a NiCuSSe/NF electrode, and a preparation method and application thereof. The preparation method comprises the following steps: preparing a NiCu/NF substrate; preparing a CH4N2Ssolution and a Na2SeO3 solution; mixing the prepared CH4N2S solution with the Na2SeO3 solution to obtain a mixed load precursor solution, transferring the mixed load precursor solution into a hydrothermal reaction kettle, then putting the NiCu/NF substrate into the hydrothermal reaction kettle, sealing the hydrothermal reaction kettle, carrying out a hydrothermal reaction, taking out the reactedsubstrate after the reaction is finished, and sequentially carrying out water washing, alcohol washing and drying treatment to obtain the NiCuSSe/NF electrode. The NiCuSSe/NF electrode prepared by thepreparation method disclosed by the invention has the advantages of large electrochemical active area and low overpotential, is relatively small in resistance to charge transfer in a hydrogen evolution reaction, is relatively high in kinetic rate, and has relatively high hydrogen evolution catalytic activity. The NiCuSSe/NF electrode provided by the invention has a good application prospect in the field of electro-catalytic hydrogen evolution.

The invention discloses a preparation method of a monatomic platinum composite electrocatalytic hydrogen evolution material. The method comprises the steps of: adopting Nickel chloride, cobalt chloride and single-layer graphene oxide (GO) as raw materials; using a deep eutectic solvent prepared from choline chloride/ethylene glycol as an electrolyte; adding GO into the eutectic solvent, and stirring at a constant temperature to form an electrolyte containing dispersed GO solid particles; adopting a nickel sheet as a counter electrode, adopting carbon cloth as a working electrode, and adopting a non-aqueous silver wire electrode as a reference electrode to form a standard three-electrode system for composite electrodeposition; putting the electrode material prepared by composite electrodeposition into a tubular furnace, and introducing argon for calcining; and adopting a platinum sheet as a counter electrode, adopting the treated sample as a working electrode, adopting a non-aqueous silver wire electrode as a reference electrode, adopting a deep eutectic solvent prepared from choline chloride/ethylene glycol as electrolyte, selecting cyclic voltammetry, and controlling different turns to load monatomic platinum. The material has excellent hydrogen evolution performance and can be applied to the field of hydrogen production through water electrolysis.

The invention discloses an efficient Ni-S-B hydrogen evolution electrode. The efficient Ni-S-B hydrogen evolution electrode comprises a nickel substrate and a Ni-S-B coating deposited on the surface of the nickel substrate, and the Ni-S-B coating is prepared from, by weight, 40%-85% of Ni, 5%-50% of S and 0.1%-10% of B. The invention further discloses a preparation method and application of the Ni-S-B hydrogen evolution electrode. According to the efficient Ni-S-B hydrogen evolution electrode, the hydrogen evolution catalytic activity of the hydrogen evolution electrode is improved, and the hydrogen evolution over-potential of the hydrogen evolution electrode is reduced.

The invention provides a self-supported Ni2P/Ni@C electro-catalytic hydrogen evolution cathode material with a flaky composite porous structure and a preparation method thereof. The preparation methodcomprises the following steps: 1, preparing a porous Ni@C material substrate by a powder metallurgy method; 2, performing hydrothermal in-situ growth of Ni(OH)2 precursor on the porous Ni@C substrate; and 3, adopting low-temperature gas-phase reaction technology to phosphatize Ni(OH)2/Ni@C to obtain the self-supported Ni2P/Ni@C material. The obtained material has a rich and communicated three-dimensional porous structures, an active substance grows on the surface of the self-supported porous substrate in situ and completely does not depend on a third-party bonding auxiliary agent, the barrierof the bonding auxiliary agent on electron transfer of a current collector is avoided, and the self-supported Ni2P/Ni@C electro-catalytic hydrogen evolution cathode material is very suitable for theapplication fields of electro-catalytic reaction process, electrochemical energy storage and the like.

The invention discloses a Ni-Cu-Ti/CNTs porous composite material and a preparation method thereof. The porous composite material is prepared by uniformly mixing Ni, Cu and Ti powder with dispersed CNTs, performing ball milling and performing cold pressing to obtain a blank and sintering the blank. The porous composite material is rich in porosity and uniform to distribute, simple and environmental-friendly in preparation process, has excellent catalytic activity of hydrogen evolution and mechanical property and can be used in hydrogen evolution reaction and industrial filtration in an alkaline environment.

A coated electrode for catalytic hydrogen evolution comprises a Ti substrate and a (W,Fe) C-P coating arranged on the surface of the Ti substrate. The (W,Fe)C-P coating with catalytic activity is directly prepared on the Ti substrate electrode. Compared with a traditional coated electrode prepared by adopting an adhesive, the coated electrode of the invention is better in binding force and betterin stability, and has prolonged service life; and low-price (W,Fe)C alloy has high hydrogen evolution catalytic activity, and introduction of the P element into (W,Fe) C further improves the catalyticactivity of catalytic hydrogen evolution, increases the working efficiency of catalytic hydrogen evolution and reduce the cost for preparing the coating electrode for catalytic hydrogen evolution.

The invention discloses a preparation method of a nitrogen-doped graphitized modified electrode, which comprises the following steps: carrying out surface cleaning treatment on a metal nickel substrate to obtain a clean metal nickel substrate; performing corrosion treatment based on solvothermal reaction on the metal nickel substrate subjected to surface cleaning treatment in a mixed solution containing molybdate and fluoride; carrying out gas-solid reaction on the metal nickel substrate subjected to corrosion treatment under the protection of inert atmosphere, and carrying out nitrogen-doped graphitization modification on substances on the surface layer of the substrate to obtain the nitrogen-doped graphitization modified electrode, compared with a traditional nickel-based electrode preparation method, based on the hydrothermal reaction, the molybdenum element is introduced to the nickel substrate, a nanorod-shaped surface structure containing bimetal is formed, and the specific surface area of the material is increased.