90 results about "Iridium oxide" patented technology

The invention relates to a membrane electrode and application thereof in deuterium-enriched water, and belongs to the field of clean energy development and utilization. The membrane electrode comprises a proton exchange membrane, an anode catalyst and a cathode catalyst, the anode catalyst is an iridium / iridium oxide catalyst with a three-dimensional porous network structure, and the cathode catalyst is a platinum-ruthenium alloy catalyst. The preparation method comprises the following steps: coating one side of the N117 proton exchange membrane with the anode catalyst, coating the other side of the N117 proton exchange membrane with the cathode catalyst, and then performing hot pressing to prepare the membrane electrode. The method comprises the following steps: assembling a membrane electrode into an electrolytic cell, and electrolyzing water by using the electrolytic cell to realize deuterium enrichment. The membrane electrode and the electrolytic cell are reasonable in design, the preparation process is simple and controllable, and the obtained product is high in efficiency and long in service life when used for enriching deuterium and facilitates industrial application.

The invention relates to the field of photovoltaic technology, in particular to a solar cell and a preparation process thereof, a laminated cell and a photovoltaic module. The preparation process comprises the following steps: providing a silicon substrate, and preparing a passivation layer on the surface of the silicon substrate; printing a conductive material on the passivation layer; sintering and curing the conductive material to form an initial grid line; performing laser processing on the initial grid line; wherein the conductive material comprises metal powder, glass powder, an organic carrier, iridium oxide, lanthanum oxide and titanium dioxide; the metal powder comprises at least one of silver powder, nickel powder, copper powder, silver coated copper, silver coated nickel and aluminum powder. The iridium oxide, the lanthanum oxide and the titanium dioxide are simultaneously added into the conductive material adopted in the preparation process, so that the power attenuation of the module is reduced.

The invention belongs to the technical field of electro-catalysis, and particularly relates to a short-range ordered neodymium element doped iridium oxide catalyst, an iridium oxide-based catalyst and a preparation method and oxygen evolution application thereof. The preparation method comprises the following steps: reacting iridium source metal salt with strong alkali, then carrying out alkali-assisted co-precipitation reaction with neodymium source metal salt to form iridium-neodymium co-coordinated hydrated hydroxide, and then sequentially carrying out drying, heat treatment and acid treatment to obtain the short-range ordered neodymium element doped iridium oxide catalyst. According to the method, the amorphous iridium oxide matrix dominated by side sharing [IrO6] connectivity is directly generated, meanwhile, low-valence Nd < 3 + > cations with large ion radius and obvious oxyphilicity are in a short-range frame of the amorphous iridium oxide matrix so as to synergistically activate an OPM oxide path mechanism, and the OPM oxide path mechanism overcomes the technical defects existing in an existing LOM lattice oxygen mechanism.

The application discloses a preparation method and application of a zirconium dioxide loaded iridium oxide nanocluster oxygen evolution electrocatalyst. A mixed solution of zirconium salt, amide solvent and organic acid is prepared, and the mixed solution is kept at 120 DEG C for 24 hours; after cooling, the white product is separated, washed and dried. Then, the product and iridium salt are dispersed in a mixed solution of tetrahydrofuran and water, and sodium nitrate and potassium nitrate aqueous solution are added under stirring; after stirring, rotary evaporation is carried out at 60 DEG C, and the greenish powder obtained after drying is vacuum dried at 60 DEG C for 12 hours; the greenish powder is kept in a muffle furnace at 450 DEG C for 30 minutes, and then cooled in air; the greenish powder is washed with deionized water and anhydrous ethanol for multiple times, and finally vacuum dried at 60 DEG C for 12 hours. The zirconium dioxide loaded iridium oxide material based on oxygen overflow stable tetragonal zirconia can be specially applied to an electrocatalyst for an oxygen evolution reaction in an acidic electrolyte, has excellent oxygen evolution reaction activity, follows a lattice oxygen mechanism in the reaction process, and can realize an oxygen overflow effect from tetragonal zirconia to iridium oxide nanoclusters to stabilize the catalyst.

The present invention relates to a water electrolysis electrode, a membrane electrode assembly comprising same, and an electrolysis cell comprising the membrane electrode assembly. Provided are a water electrolysis electrode, a membrane electrode assembly comprising same, and an electrolysis cell, the water electrolysis electrode comprising: a substrate; and a catalyst layer positioned on the substrate and comprising an iridium oxide and an iridium oxide-ionomer aggregate.

The application discloses a preparation method and application of an oxygen-evolving electrocatalyst of iridium oxide anchored by surface titanium oxygen species. The catalyst is obtained by electro-oxidizing a titanium nitride supported metal iridium cluster pre-catalyst. The surface titanium oxygen species is obtained by electrochemical reconstruction of titanium nitride, and the iridium oxide is obtained by electro-oxidizing a metal iridium cluster. When the catalyst is used for an anode oxygen evolution reaction, the catalyst has excellent catalytic activity and significantly improved stability. Compared with existing catalysts, the catalyst provided by the application is obtained by electro-oxidizing a pre-catalyst. In a PEM electrolytic cell, the titanium nitride carrier in the pre-catalyst plays a role of a pore-forming agent in the electro-oxidation dissolution process, and the catalytic layer is spontaneously thickened, thereby solving the problems of poor uniformity and mechanical stability of a super-thin catalytic layer electrode of a PEM water electrolysis cell, and more easily realizing large-scale industrial application under an ultra-low iridium load.

The invention discloses anode slurry as well as a preparation method and application thereof. The invention provides a preparation method of anode slurry C. The preparation method comprises the following steps: step 1, mixing an iridium catalyst, perfluorinated sulfonic acid resin dispersion liquid and a solvent to obtain slurry A; step 2, adding a platinum precursor into the slurry A to obtain slurry B; and step 3, the slurry B reacts at 50-90 DEG C to prepare anode slurry C. According to the method, the water-soluble platinum precursor is directly added into the anodized iridium oxide catalyst slurry, so that the dispersity of platinum and the capability of eliminating hydrogen in oxygen of platinum per unit mass are remarkably improved.

The present invention relates to an electrode for water electrolysis and a membrane electrode assembly comprising same, wherein the electrode for water electrolysis comprises a catalyst layer comprising a catalyst containing metallic iridium and iridium oxide, wherein the full width at half maximum of the metallic iridium peak and the iridium loading amount of the catalyst layer satisfy specific conditions.

The application discloses a method for recovering and purifying chloroiridic acid from an iridium-containing waste catalyst, which comprises the following steps: firstly, mixing the iridium-containing waste catalyst with a reaction aid and a solid oxide, and then performing a melting reaction under the temperature condition of 250-400 DEG C to obtain an iridium oxide melt which is hardly soluble in water; secondly, adding water to the melt to remove impurities, and then filtering to obtain the iridium oxide; finally, adding acid to the iridium oxide to obtain a chloroiridic acid solution. The method for recovering and purifying chloroiridic acid from the iridium-containing waste catalyst can obtain the iridium oxide which is only soluble in acid but hardly soluble in water after the melting reaction under the temperature condition of 250-400 DEG C, and then the metal impurities and the catalyst carrier in the catalyst can be removed by simple water washing, and the chloroiridic acid can be obtained by acid leaching, so that the method is short in route, low in cost, and suitable for industrial application; in addition, the purity of the chloroiridic acid is high (more than 99.95%), and the recovery rate is also high (more than 98%).

This invention discloses a method for preparing an electrically pulsed perovskite oxygen evolution reaction (OER) catalyst. The method involves overlapping electrodes on both sides of an SRIO thin film prepared from strontium nitrate, ruthenium oxide, and iridium oxide. Under an argon atmosphere, the SRIO thin film is subjected to a 2-second electrical pulse treatment via an external voltage source, with an electric field strength of 40 V / cm. This invention utilizes ruthenium oxide and iridium oxide powders as ruthenium and iridium sources, making it easier to obtain high-purity SRIO@E catalysts. This provides significant guidance for the synthesis of noble metal-based perovskite materials. Through a simple and easy-to-implement electrical pulse treatment strategy, this invention can remove some oxygen atoms from the catalyst, increasing the number of unpaired electrons available for the catalytic reaction and improving reaction activity. Furthermore, this electrical pulse treatment strategy is simple and controllable, has universal applicability, and is expected to meet the needs of industrial production.

The application discloses an iridium oxide modified fluorine-doped tin oxide electrode and a preparation method and application thereof. The electrode comprises a light-transmitting fluorine-doped tin oxide conductive glass substrate and an in-situ attached iridium oxide nano-modified layer. The preparation method comprises the following steps: preparation and aging of a precursor solution, alternating current electrochemical deposition, annealing and cleaning, and laser patterning treatment. The application further discloses a cell impedance sensor organ chip system comprising the electrode and application of the system in in-vitro drug screening. The application utilizes the low cost and light-transmitting property of the fluorine-doped tin oxide and the excellent charge injection capacity of the alternating current deposited iridium oxide nano layer to greatly reduce the interface impedance. The scheme meets the in-situ optical observation, realizes the high-sensitivity biological impedance monitoring comparable to gold electrodes, effectively solves the problems of high cost and complex process of the existing organ chip electrode, and is very suitable for popularization and application as a disposable high-throughput consumable.

The invention relates to the technical field of electrolytic catalysts, in particular to an iridium oxide nanosheet catalyst and a preparation method and application thereof. The method comprises the following steps: dissolving iridium metal salt in a mixed solvent of deionized water and ethanol in a specific ratio, adjusting the pH value of a system by combining with nitric acid, then introducing acetylacetone to construct a stable complexing system, inducing a gelation process by adding epoxypropane, and completing sol-gel phase transformation under a room temperature condition, so as to obtain the iridium complex. And finally, drying, grinding and roasting to obtain the iridium oxide with a nanosheet structure, wherein the thickness of the iridium oxide is 2-5 nm, and the diameter of the iridium oxide is 20-100 nm. The iridium oxide nanosheet catalyst prepared by the method has excellent proton conduction characteristics, shows excellent oxygen evolution reaction catalytic performance, is particularly suitable for an anode catalyst layer of a proton exchange membrane water electrolysis hydrogen production system, and can remarkably reduce the anode overpotential and improve the electrolysis efficiency.

The invention discloses an electrolyzed water catalyst and a preparation method and application thereof, and the electrolyzed water catalyst comprises iridium oxide (IrOx) and / or ruthenium oxide (RuOx), xlt; 2, the catalyst has a stable lattice structure and a nano-scale particle size; the preparation method comprises the following steps: introducing fuel gas and an oxidizing agent into a flame burner, and igniting for combustion; and controlling the volume flow ratio of the fuel gas to the oxidant, forming a reducing atmosphere in the combustion chamber, introducing an iridium-containing or ruthenium-containing compound solution into the combustion chamber in a spraying manner, carrying out a combustion reaction to generate iridium oxide (IrOx) or ruthenium oxide (RuOx), and collecting a product after the combustion reaction to obtain the electrolyzed water catalyst. Through the mode, the electrolyzed water catalyst disclosed by the invention realizes high activity and excellent stability, and the preparation process is simple in process, good in repeatability, efficient, green and environment-friendly, and high in product quality; the electrolytic water membrane electrode using the catalyst provided by the invention realizes perfect combination of high-efficiency hydrogen production and ultra-long service life.

The present invention relates to: a catalyst for water electrolysis, having a coating layer including iridium oxide particles and titanium oxide, wherein the coverage rate of the coating layer is 30-120%; and an ink composition, an electrode for water electrolysis, and a water electrolysis cell, each comprising the catalyst for water electrolysis.

The invention belongs to the technical field of water electrolysis hydrogen production materials, and discloses an IrSnOx / Ti porous transmission electrode and a preparation method and application thereof. The preparation method comprises the following steps: S1, pretreating the surface of the titanium felt; s2, taking a titanium felt as a cathode and a platinum sheet electrode as an anode, performing constant-current tin deposition in the tin electrodeposition liquid until the tin loading capacity is 0.3 mg / cm < 2 >-2mg / cm < 2 > to obtain a Sn / Ti electrode, washing the Sn / Ti electrode with deionized water, and drying the Sn / Ti electrode; s3, in a three-electrode system, taking Sn / Ti as a working electrode, taking a saturated calomel electrode and a platinum sheet electrode as a reference electrode and a counter electrode, and carrying out constant-voltage electrodeposition on amorphous iridium oxide in the iridium oxide electrodeposition liquid until the loading capacity of iridium is 0.2 mg / cm < 2 >, so as to obtain an IrSn / Ti electrode; s4, the IrSn / Ti electrode is subjected to heat treatment for 0.5-5 h at the temperature of 200-500 DEG C, and the IrSnOx / Ti porous transmission electrode is obtained. The use amount of precious metal of the membrane electrode can be effectively reduced, the titanium felt is uniformly coated, and the stability is excellent.

The invention belongs to the technical field of electro-catalysis, and particularly relates to an organic metal framework UIO-66 supported iridium catalyst as well as a preparation method and application thereof. The organic metal framework UIO-66 supported iridium catalyst provided by the invention comprises an organic metal framework UIO-66 and an iridium cluster supported on the surface of the organic metal framework UIO-66, the iridium cluster comprises the following components: an iridium elementary substance and an iridium oxide wrapping the surface of the iridium elementary substance; the chemical composition of the organic metal framework UIO-66 is C48H28O32M6, wherein M is Hf and / or Zr; the chemical composition of the iridium oxide is IrOx, wherein x is more than 0 and less than 2. The organic metal framework UIO-66 supported iridium catalyst not only has excellent electrocatalytic activity, but also has long-term stability, and can efficiently and stably operate for more than 1300h for a long time under the working conditions of strong acidity and oxidation environment in PEMWE.

The application belongs to the technical field of catalyst preparation for hydrogen production by water electrolysis, and discloses an iridium oxide catalyst based on a sacrifice template Adams molten salt method and a preparation method and application thereof. Through a sacrifice template-Adams molten salt integrated process, zinc, aluminum, magnesium or calcium salt which can be thermally decomposed at low temperature is used as a sacrifice template raw material, mixed with iridium raw material in a molten salt medium in situ, a nanoscale oxide template is formed through low-temperature thermal decomposition, the surface of the oxide template is synchronously loaded with iridium oxide, high-temperature calcination is performed to improve crystallinity and inhibit agglomeration, and finally, the template is removed through acid pickling to obtain the iridium oxide catalyst. The iridium oxide catalyst simultaneously has excellent oxygen evolution reaction catalytic activity and the process advantage of easy large-scale production, and has good industrial application value.

The application belongs to the technical field of electrocatalytic materials, and discloses a supported iridium oxide-based catalyst and a preparation method and application thereof. The application provides a preparation method for in-situ carrier production and loading of a supported iridium oxide-based catalyst. A carrier raw material which can be thermally decomposed below 400 DEG C is directly mixed with an iridium raw material in a medium such as sodium nitrate, and a nano-sized oxide carrier is generated in-situ through calcination. The supported iridium oxide-based catalyst IrO2 is uniformly distributed on the surface of a CeO2, TiO2 or ZrO2 carrier in the form of nanoparticles, and the interface is firmly combined, thereby significantly improving the utilization rate of the noble metal iridium and exhibiting excellent catalytic activity and stability in the anode oxygen evolution reaction of proton exchange membrane water electrolysis.

The application discloses a transition metal doped iridium-based nanomaterial and a preparation method and application thereof, and belongs to the technical field of nanometer scale inorganic metal material synthesis. The preparation method of the transition metal doped iridium-based nanomaterial provided by the application adopts a molten salt synthesis method, an iridium salt compound doped with a transition metal is prepared, the iridium salt compound is calcined to obtain iridium oxide doped with the transition metal, and finally the iridium oxide doped with the transition metal is reduced through high-temperature heat treatment to prepare the transition metal doped iridium-based nanomaterial. The preparation method is simple and easy to implement, green and safe, and has a high yield; under the premise of doping a small amount of transition metal, the inherent electrocatalytic activity of the iridium-based nanomaterial is improved. Moreover, the transition metal doped iridium-based nanomaterial obtained by using the preparation method has a wide application prospect in the industrialized water electrolysis of a proton exchange membrane water electrolysis cell.

A method is provided for preparing an oxygen evolution reaction (OER) catalyst comprising an iridium oxide component supported on a particulate solid support, the method comprising the steps of: (i) forming an aqueous mixture comprising a solution of a particulate solid support and a halide-free metal iridium salt; (ii) lowering the pH of the aqueous mixture to ≤5.0 to precipitate the iridium oxide component onto the particulate solid support; and (iii) separating the product of step (ii).

The invention relates to the technical field of cell catalysts, in particular to a high-activity catalyst for a proton exchange membrane fuel cell and a preparation method of the high-activity catalyst. The preparation method comprises the following steps: firstly, carrying out pretreatment on Ti < 3 > C < 2 > T < x > MXene powder to obtain dispersion liquid; then reducing chloroplatinic acid and ferric nitrate through ascorbic acid by taking the nitrogen-doped carbon-coated platinum-iron alloy as a carrier, and carrying out high-temperature cracking in combination with dicyandiamide to generate a nitrogen-doped carbon-coated platinum-iron alloy in situ; loading iridium oxide on the surface through a hydrothermal method; and finally introducing ruthenium trichloride and phenanthroline, performing high-temperature pyrolysis to form a ruthenium-nitrogen coordination structure, and performing acid pickling, activation and 4-aminophenylboronic acid surface modification to obtain the final catalyst. Through MXene carrier optimization, multi-metal component collaboration and surface modification, the electrocatalytic activity and stability of the catalyst are remarkably improved, dependence on precious metal is reduced, and the catalyst is suitable for efficient operation of the proton exchange membrane fuel cell.

The invention discloses a miniaturized low-profile flexible ocean galvanic couple type pH sensor and a preparation method thereof, and aims to solve the problems of large profile thickness and insufficient reliability of the conventional flexible pH sensor. A working electrode system and a reference electrode system in the miniaturized low-profile flexible ocean galvanic couple pH sensor are arranged on a flexible polyimide substrate, and the working electrode system comprises an iridium oxide working electrode, a first metal conduction circuit layer and a first metal bonding pad; the iridium oxide working electrode is connected with the first metal bonding pad through the first metal conduction circuit layer, the reference electrode system comprises a reference electrode, a second metal conduction circuit layer and a second metal bonding pad, and the reference electrode is connected with the second metal bonding pad through the second metal conduction circuit layer. The pH response performance is remarkably improved by utilizing the nanocrystalline iridium oxide sensing layer, the sensitivity reaches 72.76 mV / pH, and 16.84 s quick response is realized in a high-flow-velocity marine environment of 3 m / s.

This invention discloses a method for preparing a highly active and highly stable iridium oxide catalyst, comprising the following steps: adding a slow-release alkali to an aqueous solution of an iridium source and stirring to obtain an iridium-hydroxy colloidal solution; adding a sulfate solution to the iridium-hydroxy colloidal solution, stirring to obtain a slow-release acid, and stirring until a fine precipitate is obtained; washing, filtering, and drying the precipitate, followed by staged heat treatment to obtain a highly active and highly stable iridium oxide catalyst. The iridium oxide catalyst exhibits a high activity / stability at 1 A / cm². 2 Under these conditions, the electrolysis voltage of a single cell reaches 1.599–1.612 V; 2 A / cm 2 Under these conditions, the electrolysis voltage of a single cell reaches 1.746–1.759 V; 3 A / cm 2 Under these conditions, the electrolysis voltage of a single cell reaches 1.885–1.896 V, exhibiting excellent catalytic activity; moreover, stability testing showed no degradation after 500 h, demonstrating good stability. In other words, this catalyst achieves simultaneous improvement in both activity and stability.

This invention discloses a novel method for preparing and applying protonated layered iridium oxide (H-IrO2) nanosheets. The iridium oxide nanosheets possess a typical layered structure, with a large number of protons accommodating the interlayer spaces. The in-plane layers exhibit abundant metallic iridium vacancy defects and localized disorder. The preparation method includes: 1) alkaline hydrolysis of an iridium metal salt to obtain an amorphous iridium oxide precursor; 2) Joule heating treatment to obtain the layered iridium oxide nanosheet structure; and 3) acidic proton exchange to obtain protonated layered iridium oxide nanosheets. This novel layered structure exhibits high activity and excellent stability in the anodic oxygen evolution reaction of acidic water electrolysis. Its unique structure and superior performance make it a promising alternative to existing commercial catalysts, playing a crucial role in large-scale water electrolysis.

This invention proposes a novel inert titanium anode and its preparation method, belonging to the field of electrochemical technology. The novel inert titanium anode of this invention comprises a titanium substrate and an anode coating. The anode coating is loaded on the surface of the titanium substrate and has a layered structure containing three metal oxides: an inner layer of ruthenium oxide, a middle layer of iridium oxide, and an outer layer of tin oxide. Ruthenium and iridium are deposited sequentially on the surface of the titanium substrate using an electrodeposition method. Then, a tin-containing solution is sprayed onto the surface using a spraying process. Finally, a layered coating containing ruthenium, iridium, and tin oxides is generated in situ on the surface of the titanium substrate using a thermal decomposition method, resulting in the novel inert titanium anode. The novel inert titanium anode prepared by this invention exhibits good electrochemical performance and a long lifespan.

The application relates to a water oxidation electrocatalyst for a proton exchange membrane electrolysis cell anode, in particular to a SnO2-loaded amorphous IrCoO x Anode electrocatalyst and preparation method and application thereof x @The SnO2 proton exchange membrane electrolysis water anode electrocatalyst comprises SnO2 nanoparticles and amorphous IrCoO x nanoparticles, 1.5<= x <=1.9, wherein the mass content of the SnO2 nanoparticles is 16%-42%, the mass content of the IrCoO x nanoparticles is 58%-84%. The application overcomes the defects that the existing OER catalysts cannot simultaneously consider high activity and long-term stability, and thus are not suitable for large-scale commercial application.

The invention relates to a powdered catalyst material, which is particularly suitable for use in the oxygen evolution reaction in the electrolysis of water. The catalyst material comprises an unsupported ruthenium-iridium oxide, wherein the weight ratio of iridium (Ir) to ruthenium (Ru) is not greater than 4.5 relative to the total weight of the unsupported ruthenium-iridium oxide. The unsupported ruthenium-iridium oxide exhibits a powder conductivity of at least 30 S / cm. The invention also relates to a method for preparing such a powdered catalyst material, a composition, a catalyst layer, an electrode and an electrochemical device containing the powdered catalyst material, and a method for producing hydrogen using the powdered catalyst material.

The application discloses nano iridium oxide and a preparation method and application thereof, and relates to the technical field of nano materials, in particular to a preparation method of nano iridium oxide, which comprises the following steps: S1: dissolving iridium salt in water, adding an alkaline substance to adjust the pH value of the solution to 11-12 to obtain an iridium salt solution; S2: adding a reverse micelle surfactant to obtain a reverse micelle solution A; S3: adding the reverse micelle surfactant to the weak alkali solution to obtain a reverse micelle solution B; S4: mixing the reverse micelle solutions A and B, and then dispersing under the conditions of ultrasonic and monochromatic light irradiation to obtain an iridium oxide colloidal solution; S5: adding an acidic substance to adjust the pH value of the solution to 7-8; and S6: centrifuging and filtering the mixed solution obtained in the step S5, and then sequentially performing ultrasonic washing, vacuum drying and calcination on the obtained precipitate to obtain nano iridium oxide. The preparation method is simple, the obtained nano iridium oxide has high purity, small particle size, good catalytic activity and high application value.

Provided is an electrolytic water generator that electrolyzes water containing chlorine ions to generate electrolytic water containing hypochlorous acid. The electrolytic water generator includes an electrolysis cell through which the water passes and an electrode provided in the electrolysis cell. The electrode has a catalyst layer containing iridium oxide, tantalum oxide, and rhodium oxide. In the catalyst layer, the proportion of the atomic number of rhodium to the sum of the atomic number of iridium contained in the iridium oxide, the atomic number of tantalum contained in the tantalum oxide, and the atomic number of rhodium contained in the rhodium oxide is 31% or more and 60% or less.

The present disclosure provides a supported iridium oxide catalyst and a preparation method thereof, a proton exchange membrane water electrolysis anode and a proton exchange membrane water electrolysis cell, the catalyst comprising a composite carrier and a noble metal component; the composite carrier comprises Ce-doped Ti6O 11 ; the noble metal component comprises iridium oxide. The catalyst provided by the present disclosure has more excellent catalytic performance in the PEMWE process.