785 results about "Faraday efficiency" patented technology

The invention discloses a seed layer induced FeCoNiCuMo high-entropy alloy nanocage electrocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing and reacting iron, cobalt and nickel precursors to prepare a FeCoNi nanocage catalyst as a seed layer; adding copper salt and molybdate into the seed layer solution, carrying out ultrasonic mixing, adding a pH regulator and a reducing agent, carrying out ultrasonic treatment, putting the mixed solution into liquid nitrogen, cooling, carrying out primary nucleation, naturally unfreezing, standing for nucleation, cleaning, and freeze-drying to obtain the high-entropy alloy nanocage electrocatalyst. The catalyst is used for preparing urea through CO2 and NO3 <-> electro-catalysis, can effectively adjust the matching of CO2 and NO3 <-> reaction kinetics, and has extremely high Faraday efficiency and yield for synthesizing urea through C-N coupling.

The invention discloses an electricity-hydrogen coupling system risk scheduling method based on robust safety deep reinforcement learning, and the method comprises the following steps: 1), considering the Faraday efficiency loss effect of an electrolytic cell, and constructing an electricity-hydrogen hybrid energy storage dynamic operation model; 2) considering the wind power uncertainty, and establishing an electricity-hydrogen coupling system risk scheduling model considering the dynamic operation of electricity-hydrogen hybrid energy storage; 3) constructing a robust constraint Markov decision architecture; 4) parameterizing the robust constraint Markov decision architecture by using a flexible action device-evaluator baseline algorithm; and 5) solving the risk scheduling model of the electricity-hydrogen coupling system by using the parameterized robust constraint Markov decision process architecture to obtain a risk scheduling scheme of the electricity-hydrogen coupling system. According to the method, the new safety deep reinforcement learning algorithm is provided for the important requirements of energy low-carbon green transformation and energy safety, efficient and strict management and control of the electric hydrogen coupling system risk are achieved, and the reliability and safety of system operation are guaranteed.

The invention discloses a preparation method of a Co / Cu nano-alloy catalyst for reducing ammonia through electro-catalysis of nitrate, and belongs to the technical field of electro-catalysts and preparation thereof. The invention solves the problems of low Faraday efficiency and low yield in the process of converting nitrate into ammonia through electro-catalysis in the prior art. According to the invention, Cu and Co are compounded to prepare the catalyst of nitrate reduced ammonia with a nanoneedle structure, and the catalyst shows excellent Faraday efficiency and yield in nitrate reduced ammonia. A test result shows that the ammonia yield of the prepared Co / Cu nano-alloy catalyst reaches up to 16762.68 ugh <-1 > cm <-2 > and the Faraday efficiency is kept above 90% when the Co / Cu nano-alloy catalyst is in a mixed solution of 0.1 mol / L KNO3 and 1 mol / L KOH and the RHE is-0.5 Vvs.RHE. In addition, when the catalyst is at-0.4 V vs.RHE, the ammonia yield and the Faraday efficiency are kept stable during 10 cycles of the reaction.

The invention relates to the technical field of electrochemical carbon dioxide reduction reaction catalysts, and discloses a preparation method and application of a mixed ionomer modified cuprous oxide catalyst, a hydrophobic ionomer and a proton exchange ionomer are used for performing surface modification on cuprous oxide powder, an effective hydrophobic structure is constructed on a Cu2O active site in a physical coating form, and the cuprous oxide modified cuprous oxide catalyst is prepared. A stable and controllable hydrophobic gas-liquid-solid three-phase reaction micro-interface is formed, so that the problems of low C-2 Faraday efficiency, poor selectivity, serious competitive hydrogen evolution reaction, carbonate deposition and the like in the existing process of preparing a C-2 product by electrocatalytic carbon dioxide reduction are solved, and the industrial current density (gt; and the method has the advantages of simple process flow, low price, high product selectivity and the like.

The invention discloses a manganese dioxide nanoflower loaded copper-gallium electrocatalytic synthesis ammonia material prepared on the basis of gallium-based liquid metal. Manganese dioxide nanoflowers are synthesized through control of reducibility and surface characteristics of liquid metal, copper ions are anchored through electronegativity of manganese dioxide in an aqueous solution, and meanwhile, the copper gallium catalytic material is generated on the surface of manganese dioxide through in-situ reduction by ingeniously and secondarily utilizing the reducibility of the liquid metal. The thickness of the obtained nanoflower sheet layer is 2-20 nm, the copper-gallium alloy is spherical, and the diameter of the copper-gallium alloy is 20-80 nm. The process is safe, simple to operate and suitable for high-flux preparation. The catalytic material can work under various acid-base systems, and under the conditions that the pH is 13, the C (NO3 <->) is 0.1 M and the potential is-0.5 V vs RHE, the ammonia production rate is 4.75 mgNH3 / (mgcat.h), and the Faraday efficiency can reach 99.36%.

The invention discloses a self-supporting Co / CoO / Co3O4 catalytic electrode rich in oxygen vacancy as well as preparation and application of the self-supporting Co / CoO / Co3O4 catalytic electrode. The preparation method of the catalytic electrode comprises the following steps: step 1, dissolving Co (NO3) 3.6 H2O and dimethylimidazole in ethanol, uniformly mixing, adding a foamy copper substrate, putting into a drying oven, carrying out solvothermal reaction to generate a Co-ZIF precursor, and drying after the reaction is finished to obtain foamy copper containing the Co-ZIF precursor; and 2, putting the foamy copper containing the Co-ZIF precursor into a tubular furnace, introducing hydrogen-argon mixed gas, and carrying out reduction calcination at 300-500 DEG C to obtain the catalytic electrode. The invention provides application of the catalytic electrode as a cathode in a reaction of synthesizing ammonia through nitrate electroreduction. The process conditions are simple, the prepared catalytic electrode can effectively promote the electroreduction process of nitrate radicals, and high ammonia yield and high Faraday efficiency are achieved.

The invention discloses a multi-metal heterostructure electrocatalyst, a preparation method and application of the multi-metal heterostructure electrocatalyst in plastic recovery, and belongs to the field of electrochemical catalyst.The catalyst comprises hydroxide and a metal heterostructure which grow on a foam metal matrix, and according to the method, soluble metal salt is used as a raw material; the multi-metal heterostructure electrocatalyst is prepared by adopting a two-step electrodeposition method. The catalyst can be applied to the process of recycling PET-derived EG in an alkaline solution through electro-catalysis upgrading, has extremely low overpotential and relatively high Faraday efficiency when being used for electro-oxidation of PET hydrolysate, and has very good catalytic stability. The multi-metal heterostructure electrocatalyst prepared by the method can also be applied to upgrading and recycling of other plastic derivatives, and has a good application prospect in the field of upgrading and recycling of the plastic derivatives.

The invention discloses a Cu-metal phthalocyanine heterojunction catalyst, a preparation method thereof and application of the Cu-metal phthalocyanine heterojunction catalyst in preparation of 2, 5-furandimethanol through electro-catalytic hydrogenation of 5-hydroxymethylfurfural. A CuO nanowire is used as a carrier, metal phthalocyanine nanoparticles are effectively loaded through the coordination effect of 3, 4-dihydroxybenzonitrile by utilizing solvothermal reaction, and then the Cu and metal phthalocyanine heterojunction catalyst is prepared through electroreduction. The preparation method is simple, the raw materials are low in price, no precious metal is used, the production cost is effectively reduced, and the industrial application prospect is good; the catalyst has excellent electro-catalytic hydrogenation performance: at room temperature and normal pressure, the selectivity of 2, 5-furandimethanol can reach 100%, the conversion rate of 5-hydroxymethylfurfural reaches 95%, and the Faraday efficiency reaches 89%.

The invention provides a high-performance all-solid-state electrolytic tank for producing hydrogen by electrolyzing water and a preparation method of the high-performance all-solid-state electrolytic tank. The preparation method mainly comprises the following steps: preparation of electrode powder: preparing (La0. 6Sr0. 4) 0.95 Co0. 2Fe0. 8O3-delta (LSCF) powder by adopting a liquid-phase synthesis method, and preparing MxCe1-xNyO2 powder by adopting a coprecipitation method for an electrode and an isolating layer; preparing a half cell by adopting a co-casting process; an isolating layer and an oxygen electrode are prepared by adopting a silk-screen printing technology, and high-content water vapor is introduced to realize hydrogen production by electrolyzing water. The prepared high-performance all-solid-state electrolytic tank has efficient water electrolysis hydrogen production catalytic activity and Faraday efficiency, can operate at the medium-high temperature of 650-850 DEG C, and can effectively reduce electric energy consumption and improve energy conversion efficiency.

The invention discloses an electrochemical synthesis method of hydrogen peroxide. Under the mild conditions of normal temperature and normal pressure, palladium-based electrodes are used as a cathode and an anode, the cathode electrolyzes water to produce active hydrogen, and meanwhile, the anode oxidizes formaldehyde to produce active hydrogen; meanwhile, the strategy that sulfo-anthraquinone is reduced by active hydrogen to synthesize H2O2 is adopted. A palladium membrane electrode loaded with Pd crystals is designed to ensure that active hydrogen rapidly diffuses to a palladium layer and shuttles back and forth into an ionic liquid organic phase containing sulfo-anthraquinone, sulfo-anthraquinone is directly reduced into sulfo-anthrahydroquinone, and then oxygen is catalyzed to obtain an ionic liquid organic phase containing hydrogen peroxide. And extracting the organic phase by using electrolyte-free water to obtain hydrogen peroxide. Under the current density of 30 milliamperes / cm < 2 >, the cumulative concentration of 6-8% is realized for H2O2, and meanwhile, a high-value formate product is obtained. By adjusting the extraction phase ratio, the Faraday efficiency of hydrogen peroxide production can reach 90%.

The invention discloses a preparation method of Ni / S co-doped hollow carbon spheres for producing H2O2 through efficient electro-catalysis ORR. The preparation method comprises the following specific steps: dispersing polystyrene microspheres, nickel nitrate hexahydrate, thiosemicarbazide and dopamine hydrochloride into a tris (hydroxymethyl) aminomethane buffer solution to obtain a mixed solution; performing centrifugation, washing, drying and drying treatment to obtain precursor powder; and carrying out high-temperature calcination on the precursor under the protection of N2, cooling to room temperature, and carrying out acid leaching, water washing and drying on the product to obtain the Ni / S co-doped hollow carbon spheres. Benefited from the regulation and control effect of doped S on an Ni atom electronic structure and the synergistic effect of a hollow structure with a high specific surface area, the Ni / S co-doped hollow carbon sphere has extremely high H2O2 selectivity and excellent catalytic activity in an alkaline 2e-ORR process, and shows high H2O2 yield and Faraday efficiency in an electrocatalytic H2O2 production test.

The invention provides an industrial electrode for synthesizing urea through electro-catalysis C-N coupling and a preparation method and application of the industrial electrode, and belongs to the field of urea synthesizing.The industrial electrode for synthesizing urea through electro-catalysis C-N coupling comprises a conductive substrate and an electro-catalysis material coating the surface of the conductive substrate; the electrocatalytic material comprises a magnesium oxide modified copper oxide catalyst, and MgO nanoparticles and CuO nanoparticles in the magnesium oxide modified copper oxide catalyst are in contact with each other to form a heterostructure. The magnesium oxide modified copper oxide catalyst is used as an electro-catalysis material, MgO nano-particles and CuO nano-particles in the catalyst material are in contact with each other to form a heterostructure, after MgO is introduced, the CO2 adsorption and activation capacity is improved, CO and NHx coupling is promoted, and the urea Faraday efficiency is improved. The industrial electrode shows excellent selectivity and stability in the process of electro-catalytic synthesis of urea.

The invention relates to the technical field of electrode material preparation and electro-catalysis application, in particular to preparation of an F-doped CuO-Co3O4 electrode material and application of the F-doped CuO-Co3O4 electrode material to ammonia production through electro-catalytic reduction of nitrate under a low-voltage condition. The transition metal heterojunction electrode material (F-doped CuO-coated Co3O4) is prepared through a two-step method, firstly, transition metal salt is loaded on a substrate electrode through a molten salt method, and then the transition metal heterojunction electrode material is obtained through a hydrothermal method and calcination. And the prepared electrode material has the outstanding advantages of low voltage and high yield in ammonia production through nitrate reduction. Especially, under the neutral condition, the composite material shows excellent electrocatalytic activity, under-0.55 V, the ammonia yield is up to 42.83 mg / h.cm < 2 >, the Faraday efficiency is 99.36%, and the composite material can be recycled for more than 15 times and has good stability. The electrode material is simple in preparation process, low in cost and environmentally friendly, large-scale special equipment is not needed in the whole production process, industrial production is easy to achieve, and the electrode material has wide market application prospects.

The invention discloses a polyoxometallate catalyst, a preparation method and an application of the polyoxometallate catalyst in electrocatalytic synthesis of ammonia, a metal organic ligand is mainly formed by complexing carboxylated imidazole ligands and metal ions, and the catalyst with a cage-shaped zero-dimensional structure of polyoxometallate wrapped by the metal organic ligand is prepared by a one-step hydrothermal method. The preparation method is simple and easy to implement, and has excellent ammonia production Faraday efficiency and stable ammonia yield in the process of promoting the electrocatalytic reduction of nitrate to synthesize ammonia, the maximum ammonia yield can reach 1.49 mmol / h / mgcat, and the maximum Faraday efficiency can reach 99.37%.

The invention relates to the technical field of electro-catalysis materials, and discloses an iron-doped copper oxide catalyst, a preparation method thereof and application of the iron-doped copper oxide catalyst in electro-catalysis of nitrate to synthesize ammonia. The method comprises the steps that CuCl2 serves as a metal precursor, ascorbic acid serves as a reducing agent, and Cu2O nanoparticles are obtained through a hydrothermal precipitation method; then, Cu2O is added into a solution containing FeSO4, sodium borohydride is added, centrifugal washing and drying are carried out, and the iron-doped copper oxide nitrate electroreduction catalyst which is rich in defects and uniform in metal dispersion is obtained through a programmed heating pyrolysis reduction method. The electro-catalytic material obtained by adopting the method disclosed by the invention has a relatively large catalytic active area and relatively abundant defect sites and oxygen vacancies, the nitrate adsorption and activation effects are improved, the supply of active hydrogen is promoted by constructing stable heterogeneous active sites, the product selectivity and Faraday efficiency in NO3RR are improved, and the electro-catalytic material has good durability.

The invention belongs to the technical field of photoelectrocatalysis ammonia synthesis catalysts, and particularly relates to a preparation method of a self-decomposition composite catalyst and application of the self-decomposition composite catalyst to construction of a photoelectrochemical cell in ammonia production. The preparation method of the self-decomposition composite catalyst comprises the following steps: mixing and dissolving cupric acetate, cobaltous acetate and urea, placing the mixture and a treated titanium mesh in a reaction kettle, carrying out hydrothermal treatment to obtain a precursor material, carrying out self-decomposition on CuCo2O4 in a calcining process in a muffle furnace to generate CuO and form an interface-free heterojunction so as to obtain a catalyst-loaded integrated electrode, and carrying out self-decomposition on the catalyst-loaded integrated electrode so as to obtain the self-decomposition composite catalyst. The catalyst is used for producing ammonia through photoelectrocatalysis nitrate reduction. The photoelectrochemical cell constructed by the integrated electrode disclosed by the invention has the characteristics of high Faraday efficiency, high ammonia yield, high conversion rate, excellent repeatability and the like, and has the advantages of low cost, simple process, environmental protection, no pollution and energy conservation.

The invention discloses a cobaltosic oxide catalyst doped with lanthanide metal, a preparation method of the cobaltosic oxide catalyst and application of the cobaltosic oxide catalyst to ammonia production through nitrate reduction. The method comprises the following steps: carrying out hydrothermal reaction on cobalt nitrate hexahydrate and a lanthanide metal salt precursor in a mixed system of isopropanol and glycerol, and then carrying out high-temperature calcination to prepare the lanthanide metal-doped cobaltosic oxide catalyst. The preparation method disclosed by the invention is simple to operate and low in cost, the prepared lanthanide metal-doped cobaltosic oxide catalyst shows excellent Faraday efficiency, ammonia yield and cycling stability in an electro-catalysis nitrate reduction reaction, a traditional path of preparing ammonia from nitrate is broken through, and more efficient performance is realized.

The invention belongs to the field of photoelectrocatalysis ammonia production, and particularly discloses a Ti (at) TiO2 array (at) CuxPt alloy composite electrode, preparation of the Ti (at) TiO2 array (at) CuxPt alloy composite electrode and application of the Ti (at) TiO2 array (at) CuxPt alloy composite electrode to photoelectrocatalysis NO3 <-> reduction ammonia production, and the Ti (at) TiO2 array (at) CuxPt alloy composite electrode comprises a Ti substrate, a TiO2 nanosheet array growing on the surface of the Ti substrate in an in-situ mode and nano CuxPt alloy particles distributed on the TiO2 nanosheet array in a dispersed mode; tiO2 nanosheets in the TiO2 nanosheet array grow in the Z-axis direction of the Ti substrate; and a heterogeneous interface exists between the nano CuxPt alloy particles and the TiO2 nanosheet array. The self-supporting material provided by the invention has excellent NH3 production activity, Faraday efficiency and stability.

The invention discloses a three-dimensional network carbon nanofiber loaded iron-based material and application of the three-dimensional network carbon nanofiber loaded iron-based material to ammonia synthesis through electro-catalysis of nitrate radicals, an obtained catalytic system comprises a three-dimensional network carbon nanofiber carrier and uniformly distributed iron nanoparticles, and three-dimensional network carbon nanofibers have ultra-light density and ultra-high specific surface area; and the loaded iron nanoparticles play a role in connecting the carbon nanofibers, so that the electron conduction of the catalytic system is accelerated, and abundant reaction active sites are provided. The invention provides an efficient non-noble metal catalyst for electrocatalytic synthesis of nitrate ammonia, can simultaneously realize super-high yield and Faraday efficiency under large current, and has great significance in promoting development of electrocatalytic synthesis ammonia technology and promoting global nitrogen cycle.

The invention belongs to the technical field of electro-catalysis, and particularly relates to a one-pot preparation method of a high-alloying gold-silver alloy aerogel material and application of the high-alloying gold-silver alloy aerogel material in electro-catalytic reduction of CO2. According to the preparation method, chloroauric acid and silver nitrate are selected as precursors for synthesizing the AuAg alloy aerogel, the AuAg alloy aerogel is prepared through a simple one-pot preparation method, and complex processes such as ultrafiltration centrifugal purification and concentration and heat treatment are not needed. Compared with an existing two-step method, the preparation process is complex, time and labor are consumed, and heat treatment is needed. However, according to the one-pot preparation method used in the invention, the high-alloying AuAg alloy aerogel can be obtained only by simply feeding, stirring and standing at room temperature. Moreover, the alloying degree of the obtained AuAg aerogel is higher, higher CO selectivity is shown in CO2RR application, and compared with AuAg alloy aerogel obtained through an existing two-step method, the CO Faraday efficiency of the AuAg aerogel is improved by about 37.1%.

The invention relates to a method for synergistically promoting electroreduction of carbon dioxide on the surface of copper into a C2 product through small molecules and a polymer, in particular to an efficient electrocatalytic carbon dioxide reduction system formed by co-modifying benzotriazole and polyvinylidene fluoride on the surface of copper, and belongs to the technical field of catalytic energy. According to the preparation method, benzotriazole (BTA) and polyvinylidene fluoride (PVDF) are sequentially coated on copper (Cu), so that a Cu-BTA-PVDF catalyst is formed. In a reaction of electrocatalytically reducing carbon dioxide into a C2 product, the small molecules can regulate a surface electronic structure or stabilize a key intermediate, and the polymer can encapsulate the small molecules to prevent the small molecules from falling off and exert an additional effect of the polymer. And the Faraday efficiency is remarkably improved under different overpotentials. After the catalyst is replaced by a copper-silver (CuAg) bimetallic catalyst, BTA and PVDF are sequentially coated, so that the Faraday efficiency of a C2 product is further improved. The smooth implementation of the patent provides a universal, simple, convenient and efficient strategy for regulating and improving the Faraday efficiency (FE) of reducing carbon dioxide into a C2 product through electro-catalysis, solves the problem of unstable structure of the conventional system, and provides greater possibility for industrialization in the field of electro-catalysis carbon dioxide reduction.

The invention discloses a multi-grain-boundary Cu-based catalyst for electrocatalytic reduction of low-concentration CO and a preparation method, and belongs to the field of catalyst preparation, and the preparation method comprises the following steps: (1) dissolving a certain amount of concentrated sulfuric acid, anhydrous cupric sulfate, sodium chloride, gelatin and the like in water at a certain temperature in sequence to prepare an electroplating solution; and (2) placing the electroplating solution in an electrolytic bath, and electrically depositing a certain amount of Cu on the gas diffusion layer under the conditions of certain temperature, voltage and current density by taking the foamy copper as an anode and the gas diffusion layer as a cathode to prepare the catalyst. The gas diffusion layer loaded multi-grain-boundary Cu-based catalyst provided by the invention can be used for efficiently electrocatalytically reducing low-concentration CO (5% CO / N2) under the conditions of normal temperature and normal pressure, reduction products are mainly ethanol, acetic acid and the like, and the total Faraday efficiency of CORR reaches 15.9% when the voltage is-0.83 V (vs.RHE).

The invention relates to a preparation method and application of a CoFe2O4 / FeOOH (at) IF self-supporting electrode for efficient electrocatalytic synthesis of ammonia. The invention relates to a preparation method and application of a CoFe2O4 / FeOOH (at) IF self-supporting electrode with high ammonia yield and Faraday efficiency in the field of nano materials. The invention aims to solve the problems of low electrochemical nitrate reduction synthesis ammonia yield and low Faraday efficiency. The preparation method comprises the following steps: taking foam iron (IF), cobalt nitrate hexahydrate, ferric trichloride hexahydrate, urea and ammonium fluoride as raw materials, preparing a CoFeOOH (at) IF precursor material through a one-step hydrothermal reaction, and then successfully preparing the CoFe2O4 / FeOOH (at) IF self-supporting electrode with high ammonia yield and Faraday efficiency through tubular furnace calcination. The CoFe2O4 / FeOOH (at) IF self-supporting electrode can be directly used as a working electrode to electrocatalyze nitrate radicals to reduce and synthesize ammonia.

The invention belongs to the technical field of nano material preparation, and provides a preparation method and application of a rare earth ytterbium-doped copper oxide nano material. The method comprises the following steps: dissolving rare earth ytterbium salt, copper salt and a surfactant in a solvent, and uniformly stirring; dissolving an organic ligand in a solvent; stirring and mixing the two solutions, transferring into a reaction kettle, and carrying out hydrothermal reaction; and centrifugally washing the obtained product with ethanol, and drying to obtain the rare earth ytterbium doped metal organic precursor nano material. And placing the obtained nano material in a muffle furnace for high-temperature calcination to obtain the rare earth ytterbium doped copper oxide material. The preparation method provided by the invention is simple, green, pollution-free and high in practical degree, and the obtained rare earth ytterbium-doped copper oxide nano material can be used as a catalyst for synthesizing ammonia by electrolytic nitrate reduction, and shows that the rare earth ytterbium-doped copper oxide nano material has relatively high ammonia yield and Faraday efficiency for synthesizing ammonia by nitrate reduction.

The invention discloses a method for reducing nitro compounds through an electrochemical microreactor. According to the method, nitrobenzene or a derivative thereof is subjected to electrochemical catalysis in a multi-channel series electrolytic tank in a constant-current electrolysis mode to be reduced to generate aniline or a corresponding aniline derivative. According to the method disclosed by the invention, the Faraday efficiency is improved from 40% to more than 80% under the condition that the yield of the nitrobenzene is kept unchanged compared with that of the existing electrochemical reduction nitrobenzene, so that the fixed energy consumption is greatly reduced, and rapid, efficient, continuous and large-scale production of the nitrobenzene and the derivatives thereof is realized.

The invention relates to a Ni monatomic doped zinc oxide electrocatalyst and application thereof in electrocatalytic synthesis of urea. Ni in the catalyst is anchored to ZnO crystal lattices in a monatomic form to form a Ni-O-Zn atomic-scale interface, Ni-Ni coordination does not exist, and the catalyst is prepared by adopting a hydrothermal method. The catalyst is loaded on a conductive substrate, CO2 and NO3 <-> are synergistically reduced in a CO2 saturated KHCO3 / KNO3 mixed electrolyte to generate urea, the urea yield is 41.38 mmol h <-1 > gcat <-1 > at-0.8 V (vs RHE), and the Faraday efficiency is 31.47%. Compared with Ni nano-particle loaded ZnO and non-doped ZnO, the catalyst has the advantages that the yield and selectivity of urea are remarkably improved, and the catalyst is suitable for efficiently synthesizing urea under mild conditions.

The invention relates to a non-noble metal-based paired electro-catalysis method for producing formic acid by coupling cathode dehalogenation with anode formaldehyde oxidation, which realizes efficient dehalogenation removal of pollutants and generation of high-value products. The Co-CuxO nanowire electrode with excellent catalytic performance is synthesized through a simple method and serves as a cathode and an anode at the same time, and the purpose that the cathode removes halogenated pollutants and the anode oxidizes formaldehyde to produce formic acid at the same time is achieved. Co-CuxO promotes generation of H *, the performance of electroreduction dehalogenation is improved, and the removal rate of trichloroacetic acid can reach 92.1% or above. And moreover, the reaction energy barrier is reduced, the selectivity of formic acid generated by oxidizing anode formaldehyde is improved, and the formic acid selectivity and Faraday efficiency can reach 100%. A paired electro-catalysis system shows extremely stable and outstanding electro-catalysis performance in the aspect of converting wastes into value-added products, and the problems of poor anode utilization rate and high energy consumption in the current electro-catalysis dehalogenation reaction are solved.

The invention discloses a preparation method of a cobalt-based nano-foam hybrid catalyst and application of the cobalt-based nano-foam hybrid catalyst in electrocatalytic synthesis of urea, and the preparation method comprises the following steps: dissolving glucose, urea, cobalt nitrate and other metal salts in deionized water, and stirring to form a uniform solution; heating the solution to form porous foam; and putting the porous foam into a tubular furnace, heating in an air atmosphere, cooling to room temperature, and carrying out heat treatment in argon-hydrogen mixed gas to form the cobalt-based nano-foam hybrid catalyst. According to the preparation method of the cobalt-based nano-foam hybrid catalyst, the material synthesis method is simple and convenient, CoCr < 1% > has the optimal Faraday efficiency and yield under-0.3 V (RHE), 23% of urea Faraday efficiency and 60 mmoL g <-1 > cat h <-1 > urea yield are achieved under the condition that CO2 is saturated in 0.2 M KHCO3 and 20 mM KNO2 electrolyte, the current density reaches 16 mA cm <-2 >, and compared with the same type of catalysts, the cobalt-based nano-foam hybrid catalyst has the advantages that the cobalt-based nano-foam hybrid catalyst has the advantages that the cobalt-based nano-foam hybrid catalyst is low in cost and good in performance. The device has the advantages of potential correction and lower energy consumption.

The present invention relates to a preparation method and application of a sulfur-doped defective porous zinc oxide catalyst, the preparation method comprising the following steps: S1, dissolving zinc nitrate in water-ethanol with a volume ratio of 1:1 and stirring evenly to obtain a zinc nitrate solution; S2, adding sodium hydroxide solution to the zinc nitrate solution, stirring for 30min and then filtering and washing to obtain porous zinc oxide; S3, treating the porous zinc oxide by a muffle furnace in an air atmosphere; S4, mixing the porous zinc oxide treated by step S3 with sulfur, then treating the mixture by a Plasma high-energy ball mill, and finally washing the mixture to obtain sulfur-doped defective porous zinc oxide. The invention has the beneficial effects of: the preparation process is simple to operate, low cost, the obtained sulfur-doped defective porous zinc oxide has a high current density and a high Faraday efficiency for carbon monoxide products, and can be used as a catalyst with excellent performance in carbon dioxide reduction technology.

The invention discloses a normal-temperature and normal-pressure optical fiber chemical synthesis method and device. The core is a sandwich type optical fiber chemical membrane electrode (anode / ion exchange membrane / cathode + diffusion layer); the parallel scattering type optical fiber realizes near-uniform illumination and local enhancement on an interface. The anode uses 90-112 nm VUV to promote H dissociation, and the cathode uses 80-100 nm VUV to activate and reduce N; the direct current / pulse of the power supply is programmable. The membrane is PEM / AEM / CEM (5-200m), and an ion channel is functionally optimized through nanofiller, crosslinking and functionalization; and the catalytic surface is loaded with 1-100nm of transition metal compound and anchored. Arranging an inert / reduced-pressure sealed light path to improve VUV coupling; raw material gas H: N = 1: 1-5 (preferably 1: 3), and inert carrier gas can be added. The system is connected to online characterization and AI closed loop, ammonia is continuously produced at 0-40 DEG C and 0.8-1.2 atm, and selectivity and Faraday efficiency are improved.