16results about How to "Improve Faraday efficiency" patented technology

This invention provides a method for preparing a foamed copper-based composite organic compound layer catalytic material, comprising the following steps: forming 8-hydroxyquinoline molybdenum (Mo(C)) on the surface of a foamed copper matrix. 9 H 6 NO) 4 Organic compound layer; 8-hydroxyquinoline molybdenum (Mo(C)) 9 H 6 NO) 4 The organic compound layer is converted into phthalimide 8-hydroxyquinoline molybdenum (C). 8 H 4 NO 2 ) 2 (C 9 H 6 NO) 2 ; Phthalimide 8-hydroxyquinoline molybdenum Mo(C) 8 H 4 NO 2 ) 2 (C 9 H 6 NO) 2 Conversion to copper phthalimide / 8-hydroxyquinoline molybdenum Cu(C) 8 H 4 NO 2 ) 2 / Mo(C 9 H 6 NO) 2 The foamed copper-based composite organic compound layer catalytic material is finally obtained. The catalytic material prepared by the method of this invention can effectively improve the Faradaic efficiency, ammonia selectivity, production rate, and nitrate removal rate of the electrochemical reduction of nitrate to ammonia technology.

This invention discloses a Co3O4 / CeO2 composite electrode, its preparation method, and an electrosynthesis method for epoxides. The Co3O4 / CeO2 composite electrode comprises carbon paper and a Co3O4 / CeO2 nanoneedle composite material supported on the carbon paper. This invention uses the Co3O4 / CeO2 nanoneedle composite material as the anodic electrocatalyst to prepare epoxides in a chloride-mediated aqueous solution system with olefins as substrates under low / room temperature and atmospheric pressure via anodic electrooxidation. The electrosynthesis method of this invention uses water as the sole oxygen source, eliminating the need for external peroxides, molecular oxygen, or other hazardous oxidants. The reaction conditions are mild, environmentally friendly, and energy-efficient, exhibiting both high activity and high stability. It is applicable to the electro-epoxidation reactions of various olefin substrates, solving problems such as severe oxygen evolution side reactions, poor catalyst stability, and difficulty in balancing activity and selectivity in existing technologies.

This invention relates to a copper oxide material, its preparation method, and its application. The preparation method includes: mixing an inorganic base, a dispersant stabilizer, and a copper salt in water to form a raw material solution; carrying out a precipitation reaction; washing and drying the precipitated product to obtain the copper oxide material; the pH value of the raw material solution is 13.10-14; the copper salt includes copper acetate. This invention also provides the copper oxide material obtained by the above preparation method and its application in the electrocatalytic reduction of carbon dioxide. The preparation method is simple and controllable, and the prepared copper oxide material exhibits high electrocatalytic carbon dioxide reduction performance.

The invention discloses a method for electro-catalytically synthesizing 6-aminocapronitrile by using a coated electrode, which comprises the following steps: taking cyclohexanone and ammonium chloride as electrolyte, adopting a three-electrode system, and carrying out electro-catalytically synthesizing 6-aminocapronitrile in a RHE potential range of-0.6 V vs to-1.1 V vs at room temperature, wherein the catalytic electrode is formed by coating a catalyst on a substrate, the catalyst is CoOx / CuOx, CoOx or a mixture of CoOx and CuOx, and the substrate is foamy copper subjected to acid treatment and roasting; in the catalytic reaction process, cyclohexanone is subjected to hydrogenation reduction through a cathode to generate cyclohexanol and reacts with NH4 < + > to generate imine, and then the imine is further subjected to hydrogenation reduction on the cathode to generate 6-aminohexanol; the generated 6-aminohexanol is oxidized into 6-aminohexanal on the surface of the anode, the 6-aminohexanal reacts with NH4 < + > to generate 6-aminohexanamide, and the 6-aminohexanamide is further dehydrated to generate 6-aminocapronitrile. The preparation process is simple, easy to control and environmentally friendly, the raw materials are cheap and rich in resources, and the problems that traditional 6-aminocapronitrile synthesis is high in energy consumption, low in selectivity and dependent on precious metal catalysts are effectively solved.

The invention relates to the technical field of electrocatalysis, and discloses a hydroxide anode for preparing carbon monoxide through electrochemical reduction of carbon dioxide and a preparation method thereof.The hydroxide anode for preparing carbon monoxide through electrochemical reduction of carbon dioxide comprises a base material and a catalyst arranged on the base material, the catalyst comprises a cobalt-chromium-molybdenum alloy and a coating layer coating the outer surface of the cobalt-chromium-molybdenum alloy, and the coating layer comprises a carbon coating layer and tungsten oxide loaded on the carbon coating layer. The molybdenum element, the cobalt element and the chromium element form an alloy, and CO accumulation is reduced. The surface of the cobalt-chromium-molybdenum alloy is coated with the carbon coating layer, the conductivity of the hydroxide anode is improved, CO molecules are prevented from making contact with the surface of the alloy, in the long-term use process, the activity of a catalyst cannot be reduced due to CO poisoning, the hydroxide reaction can be efficiently conducted in the electrolysis process, the Faraday efficiency is improved, and the stability of the electrode is guaranteed. Tungsten oxide is loaded on the surface of the carbon coating layer, so that the activity and the stability are further improved.

The application relates to a Ni-W bimetallic catalyst and a preparation method and application thereof, and the preparation method comprises the following steps: I. dissolving a soluble nickel salt, a soluble tungsten salt, and urea and ammonium fluoride in water to form a precursor solution; II. taking carbon paper as a carrier, immersing the precursor solution obtained in the step I in water, and performing hydrothermal reaction to grow the catalyst on the carbon paper; III. performing heat treatment on the carbon paper loaded with the catalyst obtained in the step II under a nitrogen atmosphere to prepare the Ni-W bimetallic catalyst. The Ni-W bimetallic catalyst prepared by the application presents a nano flower morphology, exposes more reaction active sites, the surface of the Ni-W bimetallic catalyst co-modified by single-atom tungsten and metal defects can enhance the adsorption of 5-hydroxymethylfurfural, the bulk phase composed of the Ni-W solid solution induces the generation of more active sites, greatly improves the overall catalytic activity, and realizes high HMF conversion rate, high 2,5-furan dicarboxylic acid yield and high faraday efficiency.

The invention relates to the technical field of electrochemical reduction of carbon dioxide, and particularly discloses a preparation method of formic acid, which comprises the following steps: performing electrochemical reduction on a material containing carbon dioxide; wherein a cathode electrode used when the electrochemical reduction is carried out comprises a titanium-doped bismuth-based material, and the titanium-doped bismuth-based material has a nanorod shape; the titanium-doped bismuth-based material with the nanorod morphology is used as the electrocatalyst, the hydrogen evolution reaction in the electrochemical reduction reaction is inhibited, the formic acid selectivity is remarkably improved, the long-term stability is achieved in an electrolytic tank, and particularly, carbon dioxide can be efficiently reduced into pure formic acid in a solid electrolytic tank.

A lithium-mediated electrochemical method for ammonia synthesis, relating to the field of ammonia synthesis technology, solves the technical problems of severe side reactions, limited nitrogen mass transfer, and poor interfacial stability in existing lithium-mediated ammonia synthesis systems. Tetra(4-formylphenyl)porphyrin iron and an amino-containing multifunctional organic ligand are added to a mixed solvent of n-butanol and o-dichlorobenzene. An acid catalyst is added, and after stirring until homogeneous, the mixture is degassed and sealed for reaction. The solid product is collected by centrifugation, washed, and dried to obtain COF powder. This powder is then added to an ethanol-water solution, followed by ultrasonic dispersion with Nafion solution. The powder is then drop-coated / sprayed onto the surface of a carbon paper current collector and dried. This powder is used as the working electrode, with a platinum mesh as the counter electrode, a platinum wire as the quasi-reference electrode, and a LiBF4 tetrahydrofuran solution as the electrolyte. Ethanol is used as the proton donor, and electrolysis is performed under a nitrogen atmosphere using a constant current. This invention can be applied to the field of ammonia synthesis technology.

The invention relates to the technical field of electrochemical catalysis and carbon dioxide conversion, in particular to a silicon carbide loaded Ag30Cu14 nanocluster catalyst and application thereof in electrocatalytic CO2 reduction. The silicon carbide loaded Ag30Cu14 nanocluster catalyst is an Ag30Cu14 bimetallic nanocluster with precise atoms, the chemical formula is Ag30Cu14 (TPP) 4 (SR) 28, the silicon carbide loaded Ag30Cu14 nanocluster catalyst has an irregular structure of an Ag27 core and an Ag3Cu14 shell, and the silicon carbide is loaded with the Ag30Cu14 nanocluster; the silicon carbide-loaded Ag30Cu14 nanocluster catalyst prepared by the preparation method disclosed by the invention is a loaded CO2RR catalyst which is low in cost and accurate in atom structure, and the product selectivity can be regulated and controlled through post-treatment.

This invention belongs to the field of materials science, specifically disclosing an electrocatalyst, its preparation method, and its application. The electrocatalyst of this invention comprises a copper layer, a copper nanosheet array, and a quaternary ammonium salt polymer; the copper nanosheet array is disposed on the surface of the copper layer; the copper nanosheet array is composed of arranged copper nanosheets; the quaternary ammonium salt polymer is distributed on the surface of the copper nanosheets and between adjacent copper nanosheets. The electrocatalyst of this invention uses a quaternary ammonium salt polymer supported on the surface of and between the copper nanosheets, enabling the electrocatalyst to possess a robust and efficient gas-liquid-solid three-phase interface in a strongly acidic medium, effectively improving the selectivity, carbon conversion rate, and operational lifespan of the electrocatalyst for CO2 reduction.

The application belongs to the technical field of electrochemical catalysis and energy chemical industry, and discloses a copper-based composite catalyst, a preparation method, a dynamic potential stabilization method and application. A strategy of catalyst preparation and electrochemical operation is provided, which specifically comprises a Cu / Cu2O composite catalyst easy to prepare on a large scale, and a pulse potential operation method for dynamically maintaining the activity of the catalyst, so that efficient and stable co-production of furfural electro-oxidation and hydrogen production is realized.

This invention belongs to the field of ion exchange membranes, and discloses an anion exchange membrane, its preparation method, and its application in flow batteries and hydrogen electrolyzers. The preparation method involves first copolymerizing tetraphenylethylene-vinyl monomers with styrene monomers via solution polymerization to obtain copolymer A; then, copolymer A undergoes a chloromethylation reaction to obtain copolymer B; finally, copolymer B reacts with trimethylamine to obtain polymer C. This polymer C can be used to fabricate anion exchange membrane using common polar, high-boiling-point solvents such as N,N-dimethylformamide via solution casting. This anion exchange membrane can be applied to flow batteries, improving coulombic efficiency and energy efficiency in vanadium redox flow battery systems and ensuring cycle stability; it is particularly suitable for use in AEM hydrogen electrolyzers, exhibiting excellent durability, high ionic conductivity, and mechanical properties.

This invention relates to the field of electrosynthesis of high-value-added products, and more particularly to a supported catalyst for the electrocatalytic reduction of oxygen to produce hydrogen peroxide, its preparation method, and its application. The catalyst is represented by the formula NiTPP@CNT-ox, wherein oxygen-doped carbon nanotubes (CNT-ox) serve as the support, and nickel tetraphenylporphyrin (NiTPP) serves as the active site. This invention utilizes a dispersion-adsorption method to adsorb NiTPP onto CNT-ox, obtaining the supported catalyst NiTPP@CNT-ox. The NiTPP@CNT-ox prepared by this invention exhibits high catalytic activity, selectivity, and excellent stability in the electrocatalytic reduction of oxygen to produce hydrogen peroxide, showing promising application prospects.

This application discloses a palladium-hydrogen rare earth nanoalloy material, its preparation method, and its application. The palladium-hydrogen rare earth nanoalloy material includes a carbon support and PdREH nanomaterials loaded on the surface of the carbon support. x Nanoparticles, PdREH x The nanoparticles comprise an alloy of Pd and rare earth elements (RE), and hydrogen embedded in the alloy lattice; wherein the rare earth element RE is one of Y, Ce, Sm, Gd, and Tb. This application constructs a nanoalloy material with a stable lattice structure and good hydrogen intercalation capability by forming an alloy of palladium and rare earth elements and further intercalating hydrogen. Simultaneously, by combining a carbon support with a two-step Joule thermal-hydrothermal preparation process, the composition and structure of the material can be controllably adjusted. This material exhibits excellent electrochemical response sensitivity, high ethylamine production capacity, and high Faradaic efficiency in the acidic electrocatalytic hydrogenation of acetonitrile to ethylamine reaction, making it suitable for low-resistance proton exchange membrane devices.

The invention belongs to the technical field of electro-catalytic materials and biomass energy conversion, and particularly relates to an S-doped CoV-LDH electrode material and a preparation method and application thereof. The invention discloses an S-doped CoV-LDH electrode material. The electrode material comprises a conductive substrate and an S-doped CoV-LDH active layer which grows on the surface of the conductive substrate in situ, in the S-doped CoV-LDH active layer, an S element is doped in a lattice of CoV-LDH and partially replaces lattice oxygen. According to the material, lattice distortion is triggered through S anion doping, the electronic structure of CoV-LDH is effectively regulated and controlled, and competitive adsorption of a reaction substrate is balanced, so that the activity, selectivity and stability of HMF electrocatalytic oxidation are remarkably improved, and low-energy-consumption HMF oxidative coupling hydrogen production is successfully realized.

The application relates to the technical field of catalytic materials, and discloses a cation-fixed acidic membrane electrode assembly as well as a preparation method and application thereof. The preparation method comprises the following steps: adding ion exchange resin into an alkali cation solution and stirring to obtain a mixed solution; fully precipitating the mixed solution, performing solid-liquid separation, and then drying to obtain alkali cation resin; taking carbon paper loaded with a catalyst as a cathode, uniformly laying the alkali cation resin on the surface of the cathode, taking a titanium mesh loaded with iridium oxide as an anode, separating the cathode from the anode by using a proton exchange membrane, and assembling the membrane electrode assembly. The prepared acidic membrane electrode assembly is applied to electrocatalytic carbon dioxide reduction. The resin fixed on the cathode hinders the migration of H + + from the anode to the cathode, thereby improving the local pH of the cathode, enhancing the selectivity of target products in the acidic CO2RR, avoiding salt precipitation, greatly improving the stability, and realizing efficient electrocatalytic carbon dioxide reduction for preparing CO under acidic conditions.