825 results about "Iridium" patented technology

The invention relates to an iridium dioxide catalyst and a preparation method and application thereof, the iridium dioxide catalyst is a material with a three-dimensional porous structure, and the three-dimensional porous structure comprises mesopores and macropores; the characteristic peak of rutile type iridium dioxide exists in the XRD spectrogram of the iridium dioxide catalyst. When the catalyst disclosed by the invention is used as an anode catalyst in water electrolysis hydrogen production, the loading capacity of the catalyst can be effectively reduced, the dispersity is improved, and meanwhile, the catalyst has better mass transfer effect and conductivity, higher catalytic activity and excellent stability.

An iridium-based catalyst, wherein iridium in the catalyst is in the form of crystalline iridium dioxide. Relative to the catalyst as a whole, the content of the iridium element by mass fraction is greater than 70%, and the apparent mass-to-volume ratio of the catalyst is not higher than 0.55 g / cm3. The catalyst has a large specific surface area, a high porosity, and a low apparent mass-to-volume ratio, and therefore has excellent mass transfer performance and apparent catalytic activity. A three-dimensional porous structure of the catalyst can improve the utilization rate of the iridium element, so that the loading capacity of iridium in a membrane electrode is reduced, and the catalyst has excellent stability. The provided preparation method is simple, convenient, and highly economical.

The invention discloses a component gradient iridium tantalum coating anode and a preparation method thereof, the component gradient iridium tantalum coating anode comprises a titanium-based bottom layer, a middle layer and a surface active layer structure with component gradient, and the middle layer and the active layer are both prepared through a thermal decomposition method. And the intermediate layer is prepared on the titanium substrate and is composed of TiO2 / Ta2O5 mixed oxide. The surface active layer is prepared on the outer side of the middle layer and comprises a plurality of layers of IrO2 / Ta2O5 oxide coatings with different iridium-tantalum proportions. Compared with a traditional uniform coating anode, the prepared component gradient iridium tantalum coating anode can relieve the stress concentration phenomenon and reduce coating cracking, the service life of the anode is remarkably prolonged, and the catalytic activity of the anode is remarkably improved; the modified carbon nano tube is added into the active layer precursor solution, so that the conductivity change caused by component gradient is improved, and the cell voltage of the component gradient iridium tantalum coating anode is effectively reduced; and moreover, the iridium content is lower, and the preparation cost of the electrode is reduced.

The present invention provides a catalyst-layer-equipped electrolyte membrane and an application of the same, said catalyst-layer-equipped electrolyte membrane comprising: an anode catalyst layer containing an ionomer and an anode catalyst component that is composed of iridium-containing manganese dioxide, the molar ratio of iridium to manganese in the anode catalyst component being 0.011-0.182, and the logarithm log(amount of ionomer / amount of anode catalyst component) of the ratio of the amount of the ionomer to the amount of the anode catalyst component being −1.40 to −0.46; a proton exchange membrane; and a cathode catalyst layer.

The invention relates to an electrolyzed water catalyst and a preparation method and application thereof, the electrolyzed water catalyst is a three-dimensional porous material of elemental iridium and / or iridium oxide, the specific surface area of the electrolyzed water catalyst is greater than or equal to 65 m < 2 > / g, the porosity is greater than or equal to 40%, and the electrolyzed water catalyst has a mesoporous and macroporous structure. The electrolyzed water catalyst disclosed by the invention has a large specific surface area, high porosity and a three-dimensional porous structure of mesopores and macropores, so that the electrolyzed water catalyst has better mass transfer performance and apparent catalytic activity. The three-dimensional porous structure of the catalyst can improve the utilization rate of the iridium element, so that the loading amount of iridium in a membrane electrode is reduced, and the catalyst has excellent stability. The preparation method provided by the invention is simple and convenient, and has relatively high economical efficiency.

The invention provides a combined crucible and an oxide crystal growth method.The combined crucible is used for oxide crystal growth and comprises a first ceramic crucible, a second ceramic crucible, a third ceramic crucible and a fourth ceramic crucible, the graphite layer is arranged in the first ceramic crucible; the second ceramic crucible comprises a second containing space with the top open and the bottom closed, and the second ceramic crucible is arranged in the graphite layer. The combined crucible is designed by adopting an iridium-free scheme, so that the cost of the crucible can be greatly reduced.

An iridium-based catalyst. Relative to the total mass of the catalyst, the mass percentage content of an iridium element is 70% or higher. The apparent density of the catalyst is not higher than 0.55 g / cm3. The catalyst has a large specific surface area, high porosity and low apparent density, and therefore has excellent mass transfer performance and apparent catalytic activity. A three-dimensional porous structure of the catalyst can improve the utilization rate of the iridium element, thereby reducing the loading of iridium in a membrane electrode, and the catalyst has excellent stability. A preparation method provided is simple and convenient, and has relatively high economic efficiency.

The invention discloses a nano-alloy catalyst for anion exchange membrane electrolyzed water and a preparation method of a membrane electrode of the nano-alloy catalyst, when any one of manganese salt, cerium salt, chromium salt, cobalt salt, lanthanum salt, ruthenium salt and iridium salt is not added, NiFe binary alloy powder is obtained, the content of Ni is 90%-100%, and the content of Fe is 0%-10%; when any one of manganese salt, cerium salt, chromium salt, cobalt salt, lanthanum salt, ruthenium salt and iridium salt is added, NiFe ternary alloy powder is obtained, the content of Ni is 76%-96%, the content of Fe is 4%, and the content of the third element is 0%-20%. The nano-alloy catalyst material for anion exchange membrane water electrolysis prepared according to the invention is good in corrosion resistance and high in stability, the total water splitting efficiency is further improved, the synthesis method is simple, the used metal salt is low in cost, the metal salt can be uniformly loaded on a substrate carrier through spraying, and industrial application of total water splitting under high current density is easy to realize.

The invention discloses iridium series mixed metal oxide titanium anode plate welding equipment, and relates to the technical field of welding equipment, the iridium series mixed metal oxide titanium anode plate welding equipment comprises a welding rack, a welding mechanism and an anode plate clamp, and the welding rack comprises adjustable supporting legs. The equipment stability is ensured through the adjustable supporting feet and the workbench structure, the anode plate clamp is matched with the first servo motor and the second servo motor on the portal frame to drive the threaded rod and the adjusting sliding block structure, the welding mechanism can be accurately positioned on the X / Y axis, flexible adjustment of a three-dimensional space welding path is achieved in combination with Z-axis downward pressing control of the telescopic cylinder, and the welding efficiency is improved. The integration of the process database and the touch display screen simplifies the parameter calling process, the microcontroller feeds back welding data in real time through the visual monitoring assembly, the consistency of the welding quality is effectively guaranteed, the protection assembly reduces the harm of intense light radiation to operators, and then the automation efficiency and safety are improved. And the titanium anode plate welding efficiency and the finished product qualification rate are remarkably improved.

The invention relates to an iridium-based catalyst, a preparation method thereof and application of the iridium-based catalyst in proton exchange membrane water electrolysis hydrogen production, the iridium-based catalyst is a material with a three-dimensional porous structure, and the iridium-based catalyst contains more than 80% by mass of iridium element; a characteristic peak of elemental iridium exists in an XRD spectrogram of the iridium-based catalyst. Compared with an existing iridium black catalyst, when the iridium-based catalyst disclosed by the invention is used for producing hydrogen by electrolyzing water, the usage amount of the catalyst can be reduced, and meanwhile, the iridium-based catalyst has better mass transfer effect and conductivity, higher catalytic activity and excellent stability.

The invention discloses a Ti / IrO2-SnO2-SbO2 gradient active coating anode with low cost and high stability and a preparation process of the Ti / IrO2-SnO2-SbO2 gradient active coating anode. The gradient active coating is characterized in that the gradient active coating is composed of 3-5 layers, the total thickness is 5-15 microns, the thickness of each layer is 1-5 microns, the molar percentage content of iridium in a bottom layer is 0-5%, the sum of the molar percentage content of tin and antimony is 95-100%, the molar percentage content of iridium in a surface layer is 10-20%, the sum of the molar percentage content of tin and antimony is 80-90%, and the thickness of each layer is 1-5 microns. The molar percentage content of iridium from the bottom layer to the surface layer is sequentially increased from 2% to 10%, the molar percentage content of tin and antimony is sequentially reduced from 2% to 10%, and the total iridium loading amount in the gradient active coating is 0.05-0.2 mg / cm < 2 >. The preparation method comprises the three steps of titanium substrate pretreatment, precursor salt alcohol solution preparation and gradient active coating preparation. By adopting a gradient coating mode, the thermal stress between the coating and the titanium substrate in the preparation process is remarkably reduced, the consumption of noble metal is reduced, the oxygen evolution activity of the anode is improved, and the service life of the anode is prolonged. The method is simple to operate and low in cost, and has remarkable industrialization advantages.

The invention discloses a sulfide solid electrolyte, a preparation method thereof and an all-solid-state battery. The sulfide solid electrolyte comprises Li, P, S, halogen and a soft acid element, and further comprises a sulfydryl group; the soft acid element comprises at least one of titanium, erbium, bismuth, tin, cadmium, iridium, osmium, indium or antimony. The sulfide solid electrolyte provided by the invention has high ionic conductivity, low sensitivity to water and good air stability.

The invention discloses a high-precision point iridium welding device and process, and relates to the technical field of pen point welding. The device comprises a conveying assembly capable of moving along an annular path, a welding assembly arranged below the conveying path and positioning tools arranged corresponding to conveying blocks. The conveying assembly comprises a plurality of conveying blocks, and the positioning tool is used for inserting a to-be-welded pen point base material; the welding assembly comprises a hopper, a feeding pipe coaxially connected with the hopper in a sliding mode, an electrode ring fixed to the top end of the feeding pipe and an inverted-cone-frustum-shaped iridium particle groove formed in the top end. The hopper can be filled with iridium particles to be welded, the feeding pipe can ascend and descend in the vertical direction, and the iridium particle groove can bear one iridium particle. Through cooperation of the conveying block and the positioning tool, quick assembly and feeding of the pen point base material are facilitated, the feeding difficulty is reduced, and manual feeding is more labor-saving.

The invention belongs to the technical field of organic electroluminescent materials, and provides an iridium-containing heterocyclic phosphorescent doping material and an organic electroluminescent device.The doping material has a compound general formula shown in the formula I. Quinoline and a naphthalene ring are connected through silane or germane, and a silicon or germanium six-membered heterocyclic structure is formed. And reacting with iridium metal and a diketone monomer to obtain the iridium metal heterocyclic phosphorescent organic light-emitting material. The heteroatom silicon or germanium in the material can adjust molecular orbital HOMO and LUMO energy levels, and the polarity effect of heteroatoms promotes electron migration, reduces interface potential barriers and electron injection barriers, reduces carrier injection loss and improves carrier mobility, so that driving voltage is reduced, and the external quantum efficiency of a device is improved. In addition, the silicon or germanium heterocyclic ring has better rigidity, so that the overall stability of the structure is enhanced, and the rigid structure can prolong the service life of the device.

The invention discloses a titanium-based-iridium tantalum oxidation coating anode and a preparation method and application thereof, and belongs to the technical field of anode preparation, and the preparation process of the titanium-based-iridium tantalum oxidation coating anode comprises the steps that a titanium substrate is brushed with a solution containing a tantalum source A, then sintering is conducted, brushing-sintering is repeated, and a tantalum-coated titanium substrate is obtained; the tantalum-coated titanium substrate is brushed with the iridium-tantalum oxidation coating liquid, then sintering is carried out, and brushing-sintering is repeated, so that the tantalum-coated titanium substrate is obtained; the iridium-tantalum oxidation coating liquid contains a tantalum source B, an iridium source and a zirconium source; in the iridium tantalum oxidation coating liquid, the mass ratio of tantalum to iridium is (6-7): (4-5), according to the preparation method provided by the invention, through two times of brushing, the tantalum content in the titanium-based-iridium tantalum oxidation coating anode is more than 5% greater than the iridium content, and when the titanium-based-iridium tantalum oxidation coating anode is used for an alkaline citric acid electroplating system, the decomposition of a complexing agent can be effectively inhibited, the components of the electroplating liquid are maintained to be stable, so that the quality of a plating layer is ensured, and the service life of the plating layer is prolonged. The maintenance cost of the plating solution is reduced and the service life is prolonged.

METHOD OF TREATING AN IRIDIUM CONTAINING EFFLUENT STREAM A method of treating an iridium containing effluent stream to remove and recover iridium, the method comprising: adding a base to the iridium containing effluent stream to increase pH of the effluent stream and precipitate the iridium as a solid iridium salt; and separating the solid iridium salt from the effluent stream.

The present embodiments relate to a near field transducer for thermally-assisted magnetic recording (TAMR) with a hybrid plasmonic bottom layer. In a first example embodiment, a thermally-assisted magnetic recording (TAMR) write head is provided. The TAMR write head can include a main pole and a near field transducer (NFT). The NFT can include a first layer and a second layer. The first layer can include a first plasmonic material (e.g., rhodium, iridium, platinum). Further, the first layer can be disposed adjacent to the heat sink. The second layer can include a portion of a second plasmonic material (e.g., gold) and a first plasmonic portion (e.g., comprising rhodium). The first plasmonic portion of the second layer can be disposed adjacent to the ABS. The hybrid second layer (e.g., plasmonic bottom layer) can provide an improved NFT reliability during TAMR writing.

The invention discloses a laser-chemical composite surface planarization process based on a laser stripping sheet. The method comprises the following steps: firstly, carrying out surface scanning on the surface of a wafer subjected to laser-ultrasonic stripping by adopting femtosecond laser, thinning the wafer to a first target thickness through an ultra-short pulse cold working mechanism, and optimizing the sharp corner fluctuation of the surface at the same time; then immersing the wafer into a hydrofluoric acid-nitric acid mixed solution containing a platinum / iridium catalyst, accurately etching the residual sharp corner by utilizing a selective catalytic reaction of a contact point of a catalyst plate and the wafer, and feeding back and adjusting processing parameters in real time through a morphology monitoring module and an infrared thermal imaging system; and finally, thinning to the required thickness by adopting chemical mechanical polishing, and obtaining an atomic-scale flat surface. According to the technology, through the synergistic effect of laser pre-thinning and chemical etching, the problems that a traditional grinding technology is low in efficiency and large in material consumption are solved, and the technology has the advantages of being efficient, low in damage, high in precision and the like and is suitable for surface treatment of hard semiconductor wafers such as silicon carbide and gallium nitride.

The invention belongs to the technical field of electrochemistry, and provides a monatomic iridium-based alloy cluster catalyst and a preparation method and electrocatalysis application thereof, and the preparation method comprises the following steps: low-pressure gas-phase capillary filling: mixing an iridium organic metal precursor, a dopant metal organic precursor, a microporous carrier material and a solvent, and drying to obtain mixed powder, the mixed powder is placed in an ampoule bottle with a certain vacuum degree and sealed, then the ampoule bottle is placed in a rotary drying oven for high-temperature heat treatment, and powder a is obtained; temperature-controlled acid etching: mixing the powder a and an acid solution for reaction in the environment of protective gas to obtain black powder; the black powder is placed in H2 / Ar mixed gas for programmed heat treatment, and the monatomic iridium-based alloy cluster catalyst is obtained. The monatomic iridium-based alloy cluster catalyst prepared by the method provided by the invention shows mass activity and catalytic durability which are obviously superior to those of commercial platinum carbon in alkaline hydroxide catalysis, and has a practical application prospect.

The present disclosure provides at least one of an iridium-containing manganese oxide that exhibits high oxygen-generating electrode catalytic activity in a water electrolysis method, a catalyst that contains the same, an electrode that contains the catalyst, and a water electrolysis method that uses the electrode. With respect to the iridium-containing manganese oxide according to the present invention, the molar ratio of iridium to manganese is not less than 0.001 but 0.250 or less. In one embodiment, the manganese oxide is manganese dioxide that has a β-type crystal structure. In another embodiment, the ratio of the lattice constant in the a-axis direction to the lattice constant in the c-axis direction is not less than 1.420 but less than 1.521.

The invention provides a catalyst as well as a preparation method and application thereof, and relates to the technical field of catalysts. According to the catalyst, ruthenium-iridium alloy oxide is loaded on a high-porosity inorganic oxide carrier, the average particle size of the high-porosity inorganic oxide is 10-500 nm, and the BET specific surface area is not smaller than 200 m < 2 > / g. Preferably, the high-porosity inorganic oxide is high-porosity cerium dioxide. The catalyst disclosed by the invention has relatively high catalytic activity and durability, and also has relatively high catalytic activity under the condition of relatively few catalytic active components.

A multi-material structure includes a refractory portion with a metal or metal alloy of at least one of niobium (Nb), molybdenum (Mo), tantalum (Ta), tungsten (W), rhenium (Re), iridium (Ir), vanadium (V), and ruthenium (Ru). A structural portion is metallurgically joined with the refractory portion. The structural portion includes a titanium (Ti) alloy. At least one of the refractory and structural portions is additively manufactured.

The invention discloses a low-resistance N-type gallium oxide crystal and a growth method thereof. The growth method comprises the following steps: pretreatment of raw materials: sintering a doped gallium oxide material block formed by mixing gallium oxide powder and doped raw material powder; crystal growth: heating the iraurita crucible to melt the doped gallium oxide material block, increasing the power of the medium-frequency induction coil to raise the temperature of the gallium oxide melt, keeping the temperature, cooling to the melting point of gallium oxide, keeping the melt state, firstly reducing the power of the medium-frequency induction coil to spontaneously nucleate at the cold core of the upper surface of the melt and realize the transverse growth of the nucleated crystal; reducing the power of the lower medium-frequency induction coil to enable the gallium oxide melt to grow from top to bottom until the gallium oxide melt completely grows into crystals; after crystal growth is finished, the temperature is reduced to 1200-1400 DEG C, heat preservation is conducted, cooling is conducted to the room temperature, and the low-resistance N-type gallium oxide crystals are obtained.The growth method is simple in process, the crystal growth speed is conveniently controlled, the crystal forming rate is increased, and large-scale mass production is achieved.

The invention provides a preparation method of spherical iridium powder, and relates to the field of iridium powder preparation. The method comprises the following steps: mixing an iridium raw material and an alkaline reagent to obtain a mixture, and performing first roasting on the mixture to obtain a roasted product; pickling the roasted product to obtain a pickled product; under the mixed atmosphere of argon and hydrogen, plasma spheroidizing is conducted on the product obtained after acid pickling, and a plasma spheroidized product is obtained; the plasma spheroidized product is subjected to atomization treatment, and an atomized product is obtained; the atomized product is subjected to multi-stage cooling, and cooled iridium powder is obtained; and grading the cooled iridium powder, performing secondary roasting in a reducing atmosphere, and cooling to obtain the spherical iridium powder. The spherical iridium powder is uniform in particle size and high in sphericity degree, and the compactness and stability of the spherical iridium powder are improved.

A method may include operating a dehydrogenation process whereby a hydrocarbon-containing feed is converted to light olefins, wherein the dehydrogenation process utilizes a fluidized process catalyst that circulates between a reactor and a combustor. The method may comprise withdrawing the process catalyst from the dehydrogenation process, modifying the process catalyst to form a modified catalyst, and adding the modified catalyst back to the dehydrogenation process. The process catalyst may include from 0.1 wt. % to 10 wt. % of one or more metals chosen from gallium, indium, thallium, or combinations thereof, from 1 ppmw to 1000 ppmw of one or more metals chosen from platinum, palladium, rhodium, iridium, ruthenium, osmium, or combinations thereof, and at least 85 wt. % support. Modifying the process catalyst may include adding one or more of manganese, iron, chromium, or vanadium.

The invention discloses an ultrahigh-temperature multi-element iridium alloy material and a preparation method thereof, and belongs to the technical field of alloy materials. The iridium alloy material comprises the following elements in percentage by mass: 53 to 58.5 percent of Ir, 40 percent of Ta, 0.5 to 2 percent of Y and 1 to 5 percent of Re. The preparation method of the iridium alloy material comprises the following steps: weighing Ir, Ta, Y and Re metal powder in proportion and uniformly mixing; blank pre-pressing treatment is conducted on the evenly-mixed metal powder, the metal powder is die-cast into a block, and a pressed blank is obtained; the pressed blank is smelted through an electric arc smelting method, and an iridium alloy crude product is obtained after smelting is finished; and the smelting is repeated for more than 7 times, so that the pressed blank is uniformly smelted, the content of each component reaches the standard, and the iridium alloy material is prepared. According to the iridium alloy material, through the synergistic effect of multiple elements and the preparation technology, the triple effects of structural distortion strengthening, high-temperature stability and oxidation film integrity are achieved. And due to the high mixed entropy, a similar high-entropy alloy structure is formed, the high-temperature oxidation resistance is remarkably improved, and the alloy is suitable for various ultra-high-temperature environments.

The invention relates to the technical field of catalyst processing, and discloses a high-activity transition metal phosphide electrolyzed water catalyst and a preparation method thereof, and the high-activity transition metal phosphide electrolyzed water catalyst comprises the following components by weight: 1-3 parts of cobalt chloride hexahydrate; 0.5 to 1.5 parts of ruthenium trichloride; 0.5 to 1.5 parts of iridium chloride (III) hydrate; 1-2 parts of copper sulfate pentahydrate; 2 to 4 parts of sodium hypophosphite; 1 to 2 parts of urea; 1 to 2 parts of glucose; 1-2 parts of sodium sulfide nonahydrate; 0.5 to 1 part of crystalline aluminum chloride; 50 to 100 parts of deionized water; and 0.1 to 0.5 part of hexadecyl trimethyl ammonium bromide. By introducing the plasma auxiliary treatment technology, the electronic structure of the catalyst is optimized, the conductivity and stability of the catalyst are improved, and the efficiency and durability of hydrogen production through water electrolysis are enhanced.

A nickel-based alloy composition consisting, in weight percent, of: 1.5 to 4.5% aluminium, 1.1 to 3.4% titanium, 0.0 to 4.0% niobium, 0.0 to 5.2% tantalum, 0.9 to 6.6% tungsten, 0.0 to 3.0% molybdenum, 0.0 to 24.0% cobalt, 12.5 to 20.6% chromium, 0.02 to 0.15% carbon, 0.001 to 0.015% boron, 0.0 to 0.1% zirconium, 0.0 to 3.0% rhenium, 0.0 to 2.0% ruthenium, 0.0 to 3.0% iridium, 0.0 to 0.5% vanadium, 0.0 to 1.0% palladium, 0.0 to 1.0% platinum, 0.0 to 0.5% silicon, 0.0 to 0.1% yttrium, 0.0 to 0.1% lanthanum, 0.0 to 0.1% cerium, 0.0 to 0.003% sulphur, 0.0 to 0.25% manganese, 0.0 to 0.1 magnesium, 0.0 to 5.0% iron, 0.0 to 0.5% copper, 0.0 to 1.0% hafnium, the balance being nickel and incidental impurities, wherein the following equations are satisfied in which WAl, WTi, WNb, WTa and WW are the weight percent of aluminium, titanium, niobium, tantalum and tungsten in the alloy respectively 0.65≤0.3 WNb+0.15 W 3.6≤WAl+0.5 WTi+0.3 WNb+0.15 WTa≤5.7 WTa+0.92WW≤6.1.

The invention discloses a palladium-doped Ir-Sn oxide titanium anode with high catalytic activity and a preparation method of the palladium-doped Ir-Sn oxide titanium anode, and belongs to the technical field of electrolytic anodes. The anode comprises a titanium substrate, a TiO2-Ta2O5 intermediate layer and an Ir-Sn-Pd oxide catalyst layer, the molar ratio of Ir to Sn to Pd in the catalyst layer is (5-6): 3: (1-2), and the total metal ion concentration is 0.3 mol L. The preparation method is realized through titanium substrate pretreatment (sand blasting and etching), intermediate layer coating sintering (a TiCl4-TaCl5 solution) and catalyst layer circulating coating sintering (an H2IrCl6-SnCl4-PdCl2 mixed solution). The relatively cheap palladium element is introduced, the electron structure of the catalyst layer is optimized by utilizing the defect effect, the charge transfer resistance is reduced to 6.7 omegacm, and meanwhile, the iridium consumption is reduced by more than 30%. Experiments show that the cell voltage of the anode is stabilized at 0.95 V (the current density is 5Acm <-2 >), the accelerated life reaches 1630 hours, the coating binding force is 62N, and the corrosion rate in an acidic electrolyte is only 0.01 mm / year. Compared with a traditional iridium tantalum anode, the cost is reduced by 40%, and the overpotential in the oxygen evolution reaction is as low as 0.45 V.

The invention provides an iridium-ruthenium oxide composite catalyst, a preparation method thereof and a proton exchange membrane water electrolysis device, and relates to the field of hydrogen production through water electrolysis. The preparation method of the iridium-ruthenium oxide composite catalyst comprises the following steps: mixing sodium nitrate, ruthenium chloride and water to prepare a mixed solution, and then drying and grinding to obtain a mixture; placing the mixture on the surface of nickel foil, carrying out first heating by using Joule heating equipment, and then cooling to obtain ruthenium oxide; mixing ruthenium oxide, hexadecyl trimethyl ammonium bromide and ethylene glycol, and performing ultrasonic dispersion to obtain a ruthenium oxide solution; and mixing the ruthenium oxide solution, H2IrCl6 and potassium hydroxide, adjusting the pH value of the system to be alkaline, then carrying out second heating until reflux and constant-temperature reaction, carrying out solid-liquid separation on the reaction product, and washing to obtain the iridium-ruthenium oxide composite catalyst. The iridium-ruthenium oxide composite catalyst provided by the invention has high activity, high stability and high water electrolysis efficiency.