22results about How to "Lower overpotential" patented technology

The invention discloses a preparation method of a nanosheet-organic active molecule-catalyst hybrid material and application of the nanosheet-organic active molecule-catalyst hybrid material in a photoelectric storage integrated battery, and the preparation method of the material comprises the following steps: adding organic active molecules into an organic dispersion liquid containing nanosheets for ultrasonic dispersion, so that the organic active molecules are intercalated into the nanosheets, a nanosheet-organic molecule mixed dispersion liquid is obtained; the preparation method comprises the following steps: adding a cross-linking agent, enabling nanosheets and organic active molecules to realize covalent cross-linking under the action of a first catalyst, and physically mixing a nanosheet-organic electrode material obtained by separation with a second catalyst to obtain the nanosheet-organic active molecule-catalyst hybrid material. According to the invention, a monatomic or diatomic catalyst is introduced into the zinc ion battery for the first time, the polarization potential of the zinc ion battery can be reduced, the cycle life of the zinc ion battery is prolonged, and the zinc ion battery is used as an energy storage electrode of a photoelectric storage integrated battery, so that the storage rate of photo-generated charges is accelerated, and the overall conversion efficiency of the photoelectric storage integrated battery is improved.

The invention belongs to the field of electrocatalysts, and particularly relates to a preparation method of an in-situ loaded low-iridium electrocatalyst and application of the in-situ loaded low-iridium electrocatalyst as an OER catalyst in electrolyzed water. The method comprises the following steps: dispersing (NH4) 3IrCl6 into methanol to obtain a reaction solution, and transferring the reaction solution into a high-pressure kettle; immersing the carbon cloth into the reaction solution, and sealing the autoclave for hydrothermal reaction; the in-situ loaded low-iridium N-Ir catalyst material is directly synthesized through a hydrothermal method, so that the iridium-based material grows on the carbon cloth in situ, the synthesis operation is simple, and the catalyst has relatively high quality activity and excellent stability; n is introduced into the material, so that the synergistic effect between the materials is improved, the catalytic activity of the material can be improved, and in the oxygen precipitation process, the addition of N can promote better charge transfer and faster deprotonation ability of the material, and the catalytic kinetics of OER is improved.

The invention relates to an anode catalyst capable of being updated in situ in an electrolytic bath as well as a preparation method and application of the anode catalyst. The anode catalyst capable of being updated in situ in the electrolytic bath comprises a nickel-based self-supporting carrier and a NiFe-LDH nanosheet array S-NiFe-LDH which is loaded on the nickel-based self-supporting carrier and formed by alternately combining S element doped nickel hydroxide and ferric hydroxide.

The invention provides a preparation method and application of a MoS2 / Fe2O3 (at) Fe-MOF modified carbon electrode, and the preparation method of the MoS2 / Fe2O3 (at) Fe-MOF modified carbon electrode comprises the following steps: preparation of Fe2O3 (at) Fe-MOF powder, preparation of isopropanol IPA-MoS2 nanosheet dispersion liquid, preparation of MoS2 / Fe2O3 (at) Fe-MOF composite material dispersion liquid, and preparation of the MoS2 / Fe2O3 (at) Fe-MOF modified carbon electrode. The problems that an existing cathode is low in HO generation and activation catalysis performance, the pollutant degradation performance is not ideal, electrode materials are complex to prepare, cost is high and the like are solved. The prepared composite electrode is applied to a BEF system, has high power density, good electron transport performance and excellent degradation performance on antibiotics, can be recycled for multiple times, and has a very wide application prospect in the field of electro-Fenton.

A preparation method and application of a zinc phosphate film, which belongs to the field of metallic zinc negative electrodes of aqueous zinc ion batteries. The present invention aims to solve the problem that the artificial protective layer constructed on the surface of the existing zinc negative electrode has uneven thickness and is difficult to reach the nanometer level, or it is difficult to control the thickness of the interface protective layer. Preparation method: Add a zinc sulfate aqueous solution into a reaction container, drip a dodecyl phosphoric acid / chloroform solution on the surface of the zinc sulfate aqueous solution, and then inject a sodium phosphate aqueous solution, let it stand at room temperature, and obtain a zinc phosphate film at the interface between air and liquid; Application: The zinc phosphate film is used as an interface protective layer of the zinc negative electrode in an aqueous zinc ion battery. The present invention is used for a preparation method and application of a zinc phosphate film.

The application provides a negative electrode sheet and a battery, comprising a negative electrode current collector and negative electrode active material layers coated on both sides of the negative electrode current collector, the negative electrode current collector comprises a flat area and a circular arc area, a first negative electrode active material layer is coated on one side of the negative electrode current collector located at the inside of winding, a second negative electrode active material layer is coated on one side of the negative electrode current collector located at the outside of winding, a third negative electrode active material layer is coated on the surface of the second negative electrode active material layer away from the flat area, and a fourth negative electrode active material layer is coated on the surface of the second negative electrode active material layer away from the circular arc area; the lithium intercalation capacity of the fourth negative electrode active material layer is stronger than that of the first negative electrode active material layer, the second negative electrode active material layer and the third negative electrode active material layer; the fourth negative electrode active material layer is coated on the surface of the circular arc area, and the lithium intercalation capacity of the fourth negative electrode active material layer is strong, so that the lithium intercalation capacity of the negative electrode sheet located at the circular arc area at the outside of winding is improved, and the problem of lithium precipitation in the circular arc area of the negative electrode sheet is solved.

A low overpotential Ni3Fe-based LDH-type oxygen evolution electrocatalyst and its efficient preparation method and application. The present invention belongs to the field of LDH-type oxygen evolution electrocatalysts. The purpose of the present invention is to solve the technical problems of low energy efficiency of NiFe‑LDH-type electrodes synthesized by hydrothermal method and poor electrocatalytic oxygen evolution performance of NiFe‑LDH-type electrodes prepared by pulse electrodeposition. The present invention uses an aqueous solution of nickel salt and iron salt as an electrolyte solution, and a pretreated nickel-based material as a working electrode, and performs constant voltage deposition in a three-electrode system. During the deposition process, stirring is continued to obtain an electrocatalyst. The method of the present invention has a simple process and a high energy efficiency ratio. The obtained product has a regular shape and uniform size, and is evenly loaded on a carrier, which significantly improves the active sites and electron transfer capacity. When applied to the electrocatalytic oxygen evolution reaction, it reaches 10 mA·cm ‑2 The overpotential required for the current density is as low as 189mV, with excellent performance.

The invention relates to a preparation method of a cerium-cobalt composite oxide electrocatalyst, which comprises the following steps: soluble cerium salt, soluble cobalt salt and urea are added into water and stirred to form a mixed solution, the cerium ion concentration is 4-95 mmol / L, the cobalt ion concentration is 40-60 mmol / L, and the molar ratio of the total metal amount of the soluble cobalt salt and the soluble cerium salt to the urea is (0.01-0.5): 1; adding the mixed solution and a carbon fiber substrate into a closed container, keeping at 100-160 DEG C for 2-24 hours, and cooling to room temperature to obtain a carbon fiber substrate loaded with a catalyst precursor; the carbon fiber substrate loaded with the catalyst precursor is dried and calcined, the calcination temperature is 300-500 DEG C, the calcination time is 1-4 h, the heating rate is 1-5 DEG C / min, and the cerium-cobalt composite oxide electrocatalyst is obtained. The synthesis method is simple, low in cost and suitable for large-scale production.

The invention belongs to the field of batteries, and particularly relates to a polymer coating, a preparation method thereof, a negative electrode current collector and a negative-electrode-free sodium ion battery. The polymer coating provided by the invention is prepared from a coating containing a polymer precursor, a photocuring initiator, an electronic conductor, an ionic conductor and a binder, wherein the chemical structure of the polymer precursor is shown as a formula A; in the formula A, X is Br, and R is one or more of a propenyl group, a butenyl group, a propynyl group, a methyl vinyl ketone group, a 3-hepten-2-ketone group, a 5-methyl-3-hexene-2-ketone group and a 5, 5-difluoro-1-hexenyl group. The polymer coating provided by the invention is introduced into the negative-electrode-free sodium ion battery as a negative electrode current collector surface coating, and is matched with reasonable electron and ion conductors, so that the electron and ion transmission capability at a negative electrode interface can be obviously improved, the growth of sodium dendrites during a circulation period is obviously inhibited, and the electrochemical performance of the battery is obviously improved. # imgabs0 #

According to the preparation method of the graphene-based material provided by the invention, when the prepared graphene-based material is used for fully decomposing water, under the same current density, the graphene-based material has small overpotential in HER and OER reactions and has long-term stability.

The invention discloses a preparation method of a self-supporting electrolytic water anode of a bimetallic site oxygen coupling electrolytic acidic medium oxygen evolution catalyst, and belongs to the technical field of electro-catalysis electrode preparation and electrochemistry. The method comprises the following steps: firstly preparing a 2.0 M nitrate aqueous solution, mixing according to a non-noble metal equimolar ratio, taking the mixed solution, adding the mixed solution into a PE (Poly Ethylene) ball milling tank for ball milling, mixing the ball-milled solution with ethanol for ultrasonic treatment to obtain a catalytic solution, smearing the catalytic solution on a carrier, drying under an infrared lamp, and finally annealing in a muffle furnace. According to the method, precious metal is not needed, the prepared catalyst self-supporting electrolytic water anode is excellent in OER performance, durability, energy conversion efficiency and the like in the acid environment, the preparation process is simple, raw materials are easy to obtain, the product is stable, and the industrial application potential is achieved.

The application discloses a kind of adjustable defect sub-nanometer gold load nickel iron composite photoanode catalyst, preparation method and application, deionized water is introduced into nitrogen and is deoxidized, multi-walled carbon nanotube treated by strong acid is placed in deionized water after deoxidation, after ultrasonic dispersion is uniform, together with FeCl2, NiCl2, HMT and ammonium fluoride is added into reaction kettle, reaction is carried out at 120 DEG C for 6 hours, after cooling, it is taken out, using deionized water is filtered, washed after, HAuCl4 is quickly added, sealed and is stirred in dark room, after reaction is finished, it is filtered, washed, nitrogen is dried at room temperature and is preserved in oxygen-free atmosphere.The application is synthesized Au / NiFe (hydroxyl) oxide / CNT composite catalyst by in-situ oxidation technology one step.The method can be simultaneously controlled on the basis of heterojunction Defects, the synergistic effect of both makes the catalyst performance be further optimized.Synthesis method is simple and direct, and catalytic effect is obviously improved.

The application discloses a bifunctional electrocatalyst of N and P co-doped porous carbon nanosheet loaded FeCo hollow nanospheres and a preparation method and application thereof. The preparation method is as follows: nitrogen-doped carbon materials are prepared through grinding and mixing and high-temperature pyrolysis. Pluronic F-127, the nitrogen-doped carbon materials, iron nitrate, cobalt nitrate, melamine and o-phenylenediamine are added into an ethanol solution to be mixed, ultrasonically treated and stirred, and after reaction, the solution is evaporated, high-temperature pyrolysis and sodium hypophosphite phosphorization are carried out, and finally the bifunctional electrocatalyst of N and P co-doped porous carbon nanosheet loaded FeCo hollow nanospheres is obtained. The catalyst can exhibit excellent catalytic activity in electrocatalytic oxygen reduction reaction and oxygen evolution reaction, and can be applied in a liquid zinc-air battery.

The present application discloses a polyurethane-based nanofiber membrane coaxially coated with a MOF layer, and a preparation method and application thereof. From the inside to the outside, it includes polyurethane nanofibers as a core layer, a metal chelated polyaniline layer as an intermediate layer, and MOF particles as a shell layer. Avoiding the use of polyolefin porous membranes, using a composite diaphragm formed by a combination of polyurethane and MOF materials with high thermal stability can fully guarantee the thermal shrinkage performance of the diaphragm. At the same time, the presence of the metal chelated polyaniline layer also ensures the close combination of the MOF layer and the polyaniline layer, avoiding the risk of the MOF layer falling off.

A high temperature resistant flame retardant nanofiber membrane and its preparation method and application belong to the technical field of lithium ion battery materials. The high temperature resistant flame retardant nanofiber membrane is a polyurethane-based nanofiber membrane with an ultra-long hydroxyapatite nanowire layer coaxially coated on the surface of polyurethane nanofibers. The preparation method is: polyurethane is dissolved in an organic solvent to prepare a spinning solution, and the spinning solution is used to prepare a polyurethane nanofiber membrane by an electrospinning method. Ultra-long hydroxyapatite nanowires are in situ grown on the surface of polyurethane nanofibers by a calcium oleate precursor solvothermal method. The ultra-long hydroxyapatite nanowire layer on the surface of the high temperature resistant flame retardant nanofiber membrane prepared by the present invention has high thermal dimensional stability, and the ultra-long hydroxyapatite nanowires have the ability to regulate lithium ion transmission and induce uniform lithium deposition, thereby inhibiting dendrite growth and reducing the overpotential during the charge and discharge cycle. At the same time, it has extremely high flame retardant properties, which significantly improves the electrochemical performance and safety of the battery.

The embodiment of the present application provides a homogeneous heterogeneous synergistic catalyst, a low-temperature lithium-carbon dioxide battery and a preparation method thereof, the homogeneous heterogeneous synergistic catalyst is applied to the low-temperature lithium-carbon dioxide battery, the homogeneous heterogeneous synergistic catalyst comprises a homogeneous catalyst and a heterogeneous catalyst, the homogeneous catalyst comprises a molybdenum carbide / carbon nanowire self-supporting electrode material, and the heterogeneous catalyst comprises a phthalocyanine substance added in an electrolyte. In the embodiment of the present application, through the synergistic effect of the homogeneous catalyst and the heterogeneous catalyst, the overpotential in the charging and discharging process of the battery can be complementarily reduced, the electrochemical performance and the cycle stability of the battery are improved, and the battery has good rate performance and cycle performance.

The present invention discloses a silver electrode material with an ordered straight-through pore structure, wherein a columnar structure array composed of silver nanoparticles is distributed on the surface of the silver electrode material, and the gaps between the columnar structures are straight or approximately straight straight-through pores in the direction perpendicular to the surface of the silver electrode material; wherein the lateral size of the columnar structure is 0.1 to 20 μm, the height of the columnar structure is 0.2 to 1.4 mm, and the gaps between the columnar structures are 0.01 to 10.0 μm. The straight-through pore structure is conducive to improving the diffusion rate of the electrolyte, improving the exchange rate of reactants and products on the electrode surface during the electrochemical reaction, and improving the reaction rate; at the same time, the conductivity of the columnar structure composed of nanosilver is higher than that of the ordinary silver powder electrode, which is conducive to the transmission of electrons in the electrode body. Therefore, the polarization effect and overpotential of the silver electrode material in the present invention are lower, and the electrochemical performance is better. In addition, the present invention also provides a preparation method of the silver electrode material, which is simple in process, easy to operate, convenient in parameter control, more flexible in process, and higher in preparation efficiency.

The invention relates to a supported iridium-containing catalyst as well as a preparation method and application thereof. The supported iridium-containing catalyst comprises a carrier and an active component supported on the carrier, the carrier comprises a yttrium-doped titanium oxide compound, and the active component comprises one or more of simple substances Ir, IrO and IrO2. The active components in the supported iridium-containing catalyst are high in dispersity and good in continuity, and the supported iridium-containing catalyst has the advantages of being high in catalytic activity, good in stability and incapable of being dissolved under the severe conditions of high acidity and high potential and has the advantages of being low in overpotential, high in activity and good in cycling stability when used as an anode catalyst for hydrogen production through water electrolysis of a proton exchange membrane.

The invention provides a positive electrode material based on a two-dimensional lamellar structure, a preparation method of the positive electrode material and a lithium-magnesium dual-ion battery, coralline SnO2 (at) C is directionally formed by tin salt and cane sugar under a hydrothermal condition, carbon is removed through calcination, then the coralline SnO2 (at) C is combined with selenium powder at 400-550 DEG C, lattice conversion occurs on the basis of SnO2 through an anion exchange method that Se < 2-> replaces O < 2-> at a high temperature, and the lithium-magnesium dual-ion battery is obtained. According to the preparation method, the SnSe2 / SnO2 composite material is prepared by the following steps of: melting and recombining part of SnO2 into lamellar SnSe2, reducing part of SnSe2 into SnSe by residual carbon at the same time, and finally obtaining the SnSe2 / SnSe / SnO2 material, and the lamellar structure of the SnSe2 / SnSe / SnO2 composite material can increase the specific surface area, can be in full contact with electrolyte, and can improve the cycling stability of the battery. A 0.4 M APC-0. 4M LiCl electrolyte is matched to be used as the electrolyte of the lithium-magnesium dual-ion battery, and the prepared lithium-magnesium dual-ion battery has relatively low overpotential and long-time cycling stability.

The invention discloses a composite current collector and a preparation method thereof, a magnesium ion battery and an electric device. The composite current collector comprises a conductive composite base film, a three-dimensional porous conductive layer located on the conductive composite base film, and a first modified layer located on at least part of the surface of the three-dimensional porous conductive layer on the conductive composite base film, the conductive composite base film comprises a polymer base film and a first magnesium-loving metal, a groove is formed in the surface of the polymer base film, and the first magnesium-loving metal is located in the groove; the three-dimensional porous conductive layer is located on the side, away from the polymer base film, of the first magnesium-loving metal and comprises at least two layers of alloy layers arranged in a laminated mode, each alloy layer comprises copper and second magnesium-loving metal, and the content of the second magnesium-loving metal in the multiple alloy layers is gradually decreased from the side close to the conductive composite base film to the side away from the conductive composite base film; the first modified layer includes a covalent organic framework material. The composite current collector can improve the deposition of magnesium ions, inhibit the growth of dendrites, reduce the side reaction of an interface, and improve the cycling stability of the magnesium ion battery.

The invention discloses a preparation method and application of a double-ligand Co-based metal organic framework alkaline electrolysis water catalytic electrode material, and belongs to the technical field of electrochemical energy storage materials. The preparation method comprises the following steps: dissolving 2, 5-diphosphonic acid thiophene and 4, 4 '-dipyridyl serving as double ligands and cobalt nitrate hexahydrate serving as metal salt in a mixed solution of water and methanol; transferring the completely dissolved mixed solution into a reaction kettle, obliquely putting foamed nickel into the reaction kettle, sealing, heating and reacting, and naturally cooling to room temperature; and taking out the foamed nickel, repeatedly washing the foamed nickel with deionized water and methanol, and finally carrying out vacuum drying to obtain the Co-Tdp-Bpy catalyst loaded on the foamed nickel. The method is simple to operate, does not need tedious high-temperature pyrolysis, gas-phase reduction and other treatments, and is easy for large-scale preparation. In a standard three-electrode system, taking the prepared electrocatalyst as a working electrode anode, and carrying out electrocatalytic reaction in a 1M KOH electrolysis system; the electrocatalyst has excellent water decomposition activity and stability.

The invention discloses a method for preparing high-purity hydrogen and amorphous-phase molybdenum oxide through membrane-free full-pH water electrolysis, and belongs to the field of hydrogen production through water electrolysis and the field of metallurgical electrochemical engineering. According to the method, metal molybdenum is used as an anode, a hydrogen evolution material is used as a cathode, and voltage is controlled to be applied in a full pH value range to decompose (sea) water to prepare high-purity hydrogen and amorphous-phase molybdenum oxide species. When the applied voltage reaches the oxidation potential of the metal molybdenum, the surface of the metal molybdenum anode is gradually subjected to electrooxidation to generate solid amorphous-phase molybdenum oxide species, and meanwhile, the cathode is subjected to hydrogen evolution reaction. Along with the increase of the applied voltage, the electrooxidation rate of the molybdenum anode is increased, and no oxygen is generated, so that high-purity hydrogen is obtained at the cathode. The metal molybdenum electrode material used in the method is rich in reserve, the water electrolysis device is simple, an expensive diaphragm material is not needed, the production cost is low, the energy consumption is low, the influence of the pH value and composition of the electrolyte is small, and the method can be widely applied to the field of membrane-free full-pH-value electrolysis (sea) water hydrogen production and the field of metallurgical electrochemical engineering.