83 results about "Hydrogen oxidation reaction" patented technology

The invention provides a self-humidifying CO2 membrane electrode structure and a preparation method thereof. The self-humidifying CO2 membrane electrode structure comprises an electrolyte isolation plate, the electrolyte isolation plate is provided with an anode side and a cathode side, the anode side is sequentially provided with a cation exchange membrane, an anode catalyst layer, a current collector and an anode electrode plate, and the cathode side is sequentially provided with an anion exchange membrane, a cathode catalyst layer and a cathode electrode plate; the anode electrode plate is provided with a first inlet, hydrogen enters the anode electrode plate from the first inlet and is subjected to a hydrogen oxidation reaction under the action of an anode catalyst to generate protons and electrons, and the protons are migrated to the electrolyte isolation plate through the cation exchange membrane; the cathode electrode plate is provided with a second inlet, CO2 gas enters the cathode electrode plate from the second inlet and is subjected to a reduction reaction under the action of a cathode catalyst to generate a reduction product and OH <->, and OH <-> is migrated to the electrolyte isolation plate through the anion exchange membrane to react with protons. The long-term operation stability of the membrane electrode structure is remarkably improved.

The invention provides a PtRu-based composite bifunctional catalyst and a preparation method and application thereof, the PtRu-based composite bifunctional catalyst comprises a carrier and a load loaded on the carrier, and the carrier comprises a graphitized carbon carrier; the load comprises platinum ruthenium-based metal particles and a compound with a chemical formula of HxMO3, wherein M comprises W or / and Mo. According to the PtRu-based composite bifunctional catalyst disclosed by the invention, the metal PtRu plays a role in resisting CO poisoning, and the HxMO3 plays a role of a proton acceptor, so that a hydrogen oxidation reaction is promoted. Meanwhile, the HxMO3 can strengthen a difunctional mechanism of a carbon monoxide oxidation reaction, and the CO poisoning resistance of the catalyst is improved. In addition, the graphitized carbon carrier with a specific graphite microcrystal size has good high-potential corrosion resistance and metal dispersibility, and metal agglomeration and performance degradation of the catalyst caused by high-potential corrosion of the carrier are greatly slowed down.

The present application relates to a kind of full solid-state lithium ion membrane reactor with symmetrical structure and its application, the reactor is in situ construction on the both sides of solid-state lithium ion conductor film with Pt and / or Ni as catalyst, with single-walled carbon nanotube etc. Conductive material is used as current collector gas diffusion electrode, the reactor can work in nitrogen hydrogen mixture atmosphere, integration is high, scale is flexible.The present application changes the working mode of traditional reactor using liquid electrolyte, replaces inefficient nitrogen and proton mass transfer with efficient lithium ion mass transfer, couples lithium-mediated nitrogen reduction and hydrogen oxidation reaction to synthesize ammonia, and the maximum working current density is increased to 1000mA / cm 2 , and can work at 40mA / cm 2 Current density for a long time, with innovation and broad industrial application prospect.

A hybrid electrochemical device configuration that comprises a first electrode that includes a redox reactive material or an alloy based on a transition metal, a second electrode that includes a multi-functional catalyst to catalyze hydrogen evolution reaction, hydrogen oxidation reaction, and water oxidation reaction at the second electrode, a separator disposed between the first and second electrode, an electrolyte disposed between the first electrode and the second electrode, and a conduit which provides the means to compensate for water loss in the electrolyte during electrochemical device operation. At least one valve is included that connects the electrolyte management system to the conduit system and a valve to connect the gas formed in the electrode to the gas management system. The electrochemical device configurations include several individual devices stacked on top of each other and separated from each other using separation plates.

The invention belongs to the technical field of anion exchange membrane fuel cells, and discloses a high-stability ruthenium-based hydroxide electrocatalyst used as an anode of an anion exchange membrane fuel cell and a preparation method of the high-stability ruthenium-based hydroxide electrocatalyst. The catalyst is prepared by taking ruthenium as a unique active component, fullerene (C60) as a carbon substrate and polydopamine (PDA) as an additive through argon heat treatment. The preparation method disclosed by the invention is simple and easy to implement, and through the design scheme that C60 with high electron affinity is used as a carrier, the electronic structure of a ruthenium active site is effectively adjusted, and excessive adsorption of a ruthenium-based catalyst to hydroxyl species in a hydrogen oxidation reaction (HOR) process is weakened, so that the ruthenium reaction active site is greatly reserved for hydrogen adsorption, and the hydrogen adsorption efficiency is improved. Therefore, the stability of ruthenium-based electro-catalysis in hydrogen oxidation reaction can be greatly improved.

Methods and apparatuses for converting carbon dioxide to useful compounds are disclosed. The method involves reducing bicarbonate solution in an electrolyzer. Bicarbonate solution is supplied to the cathode. The direct reduction of bicarbonate at the cathode may be coupled with an oxidation reaction at the anode. The oxidation reaction may provide a source of protons (H+) to cathode for the reduction of bicarbonate. The oxidation reaction may be a hydrogen oxidation reaction (HOR). Hydrogen gas (H2) may be supplied to the anode. In some embodiments, a source of gas may be supplied to the bicarbonate solution to form a pressurized solution before supplying the solution to the cathode.

The invention discloses a Ru / Ni-3DONMC catalyst as well as a preparation method and application thereof, and relates to the technical field of new energy materials and electrochemical catalysis. According to the invention, self-designed ordered SiO2 microspheres are self-assembled as a template, a nitrogen-doped carbon carrier with a three-dimensional ordered hierarchical pore structure is constructed, and a composite catalytic system with a multi-stage active center is successfully prepared by combining a bimetallic precursor adsorption impregnation and thermal reduction process. The catalyst disclosed by the invention shows excellent bifunctional catalytic performance in an alkaline medium; only 16 mV overpotential is needed in a hydrogen evolution reaction under the current density of 10 mA cm <-2 >, and the Tafel slope is as low as 40.54 mV / dec; and in a hydroxide reaction, the material has high limiting current density of 2.55 mA cm <-2 > and excellent mass activity. And it is powerfully proved that the intrinsic catalytic activity and long-term operation stability of the hydrogen-electricity reaction can be effectively improved through a monatomic-nanocluster cooperative regulation strategy.

Methods and apparatuses for converting carbon dioxide to useful compounds are disclosed. The method involves reducing bicarbonate solution in an electrolyzer. Bicarbonate solution is supplied to the cathode. The direct reduction of bicarbonate at the cathode may be coupled with an oxidation reaction at the anode. The oxidation reaction may provide a source of protons (H+) to cathode for the reduction of bicarbonate. The oxidation reaction may be a hydrogen oxidation reaction (HOR). Hydrogen gas (H2) may be supplied to the anode. In some embodiments, a source of gas may be supplied to the bicarbonate solution to form a pressurized solution before supplying the solution to the cathode.

This invention discloses a platinum-based catalyst for the hydrogenation reaction, its preparation method, and an electrode. The catalyst uses orthorhombic niobium pentoxide (T-Nb₂O₅) as a support to support the active component platinum. The support is resistant to strong acids and electrochemical corrosion at potentials above 1.0 V (vs RHE). The catalyst exhibits a hydrogenation reaction current density of not less than 200 mA·cm⁻¹ at 0.45 V (vs RHE). ‑2 In preparation, ammonium niobate oxalate hydrate was used as the niobium source, and the mixture was gelled via a sol-gel method. The gel was then heat-treated at 600-700℃ to obtain an orthorhombic niobium pentoxide support. The pH was adjusted to less than 3, and platinum was reduced with sodium borohydride to prepare the catalyst. This catalyst was then used to fabricate a hydrogen depolarization anolyte gas diffusion electrode with a platinum loading of 0.5-1.0 mg·cm³. ‑2 It can operate continuously and stably for no less than 120 hours with a cell voltage in the range of 1.25-1.45V. The catalyst of this invention has high activity and excellent stability, and can be used as a hydrogen depolarization anode in hydrometallurgy, significantly reducing electrolysis energy consumption and making it suitable for industrial applications.

The invention relates to the field of food preservation, and discloses a tungsten oxide loaded ruthenium-tungsten alloy catalyst and preparation and application thereof in a hydroxidation reaction, and the tungsten oxide loaded ruthenium-tungsten alloy catalyst is prepared by the following steps: (1) dissolving a tungsten source in a solvent, stirring, carrying out ultrasonic treatment, then putting into a polytetrafluoroethylene reaction kettle, then putting into a drying oven, and carrying out a hydrothermal reaction; after the reaction is completed, cooling to room temperature, and washing, centrifuging and drying the obtained substance to obtain a precursor; (2) carrying out metal ruthenium loading on the prepared precursor by adopting a ruthenium source, and heating and evaporating to dryness to obtain a ruthenium-loaded precursor; and (3) the prepared ruthenium-loaded precursor is subjected to heat treatment in the reducing gas atmosphere, and the tungsten oxide-loaded ruthenium-tungsten alloy catalyst is obtained.The heterogeneous interface of the tungsten oxide-loaded ruthenium-tungsten alloy catalyst has wide application prospects, shows high catalytic activity, stability and conductivity in a hydrogen oxidation reaction, and can be used for preparing the tungsten oxide-loaded ruthenium-tungsten alloy catalyst. The catalyst is especially suitable for a hydroxide reaction in an alkaline medium.

This invention discloses a proton exchange membrane hydrogen pump anode and its application. The anode includes an anode sheet and a catalyst composited on the anode sheet. The catalyst includes a support and a first metal and a second metal composited on the support. The first metal is selected from one or more of platinum, iridium, palladium, and ruthenium; the second metal is selected from one or more of iron, cobalt, nickel, molybdenum, and vanadium. The first metal serves as the main active center for the hydrogen oxidation reaction, and the second metal can regulate the electronic structure of the first metal, thereby reducing the adsorption of carbon monoxide at the active site or promoting its oxidative removal. The synergistic effect of the two metals allows the anode containing the catalyst to maintain high hydrogen oxidation activity and stability in hydrogen fuel containing carbon monoxide, thereby improving the carbon monoxide poisoning resistance of the proton exchange membrane hydrogen pump containing the anode.

The invention belongs to the technical field of hydrogen fuel cells, and particularly relates to an anode catalyst layer applied to a fuel cell and a preparation method and application of the anode catalyst layer. The anode catalyst layer for the fuel cell comprises a water electrolysis layer and a hydroxide layer which are overlapped, and the hydroxide layer is in contact with a proton exchange membrane of the fuel cell; the water electrolysis layer comprises a water electrolysis catalyst, carbon powder and first perfluorinated sulfonic acid resin; the hydroxide layer comprises a hydroxide reaction catalyst and second perfluorinated sulfonic acid resin; the ion exchange equivalent EW1 of the first perfluorinated sulfonic acid resin is less than or equal to the ion exchange equivalent EW2 of the second perfluorinated sulfonic acid resin. The anode catalyst layer for the fuel cell has the beneficial effects that through the gradient design of the hydrophilic and hydrophobic properties of the water electrolysis layer and the hydroxide layer, the antipole resistance of the anode catalyst layer is remarkably improved, the performance attenuation degree after antipole is reduced, and the service life of the fuel cell is prolonged.

This invention discloses a Se-doped Pt-based catalyst, its preparation method, and its application, relating to the field of catalyst technology. The preparation method of the Se-doped Pt-based catalyst includes the following steps: (1) mixing conductive carbon black and selenium dioxide powder uniformly to obtain a mixture; (2) heating the mixture to 250-350℃ under an inert atmosphere and holding for 0.5-2 h; (3) subsequently heating to 950-1100℃ and holding for 0.5-2 h to obtain powder A; (4) dissolving a platinum source in water to obtain solution B, then adding powder A to solution B and mixing uniformly, followed by rotary evaporation, grinding, and heating in a mixed atmosphere of H2 and Ar to obtain the Se-doped Pt-based catalyst. The Se-doped Pt-based catalyst prepared by the method of this invention exhibits high catalytic activity and stability in the hydrogenation reaction.

The invention provides a preparation method and application of a catalyst based on a crystal platinum / amorphous vanadium oxide cluster-cluster heterostructure. The preparation method comprises the following steps: S1, synthesizing an amorphous vanadium oxide cluster; s2, synthesizing a crystal platinum cluster; and S3, synthesizing the heterostructure catalyst. Through precise synthesis and interface engineering, precise assembly of amorphous vanadium oxide clusters and precise platinum clusters is realized, a highly dispersed and uniform heterogeneous interface is obtained, and the catalyst is endowed with excellent catalytic activity and stability in alkaline hydrogen oxidation reaction.

The invention belongs to the technical field of fuel cell electrocatalysts, and particularly relates to a carbon monoxide poisoning resistant electrocatalyst for a hydroxide reaction and a preparation method of the carbon monoxide poisoning resistant electrocatalyst. The preparation method comprises the following steps: impregnating and reducing noble metals (Pt, Pd, Ir, Rh, Ru and the like) on a transition metal-nitrogen-carbon (M-N-C, M = Fe, Co, Ni, Cu, Zn and the like) carrier by virtue of an impregnation and reduction method, and creatively synthesizing the M-N-C supported noble metal alloy electrocatalyst by virtue of a one-step pyrolysis method. The electrocatalyst prepared by the invention has excellent hydrogen oxidation activity, carbon monoxide poisoning resistance and durability, the preparation method is simple, clean and environment-friendly, the equipment investment is low, batch production is facilitated, and a new thought is provided for preparing the carbon monoxide poisoning resistance electrocatalyst for hydrogen oxidation reaction.

The present disclosure relates to an electrochemical method that comprises the direct production of hydrogen from boron compound types by reduction-oxidation reactions, the simultaneous production of boron hydride compounds and the production of hydrogen by oxidation-reduction reactions of boron hydride compounds, which does not require any additional pH adjustment or purification procedure in a solution system containing low-cost boron compounds (boric acid, boron salts, etc.), and which provides direct production of high purity hydrogen in a single step and at room temperature in an environmentally friendly and low-cost manner.

The invention provides a nickel-based alloy composite zinc-nitrogen-carbon material and a preparation method thereof.The preparation method comprises the steps that after zinc salt, a nitrogen-containing organic compound and a solvent are fully stirred and mixed, heating treatment is conducted in the inert atmosphere, and the zinc-nitrogen-carbon material is obtained; and adding nickel salt and molybdenum salt into the zinc-nitrogen-carbon material, and carrying out thermal reduction in an inert atmosphere to obtain the nickel-based alloy composite zinc-nitrogen-carbon material. Compared with a commercial platinum-based catalyst, the nickel-based alloy composite zinc-nitrogen-carbon material has the advantages that the nickel-based alloy and the zinc-nitrogen-carbon material are cheap materials, the cost is greatly reduced, meanwhile, the preparation process is simple, the raw materials are wide in source, and the nickel-based alloy composite zinc-nitrogen-carbon material is suitable for large-scale preparation and application; the nitrogen-carbon nano-porous structure endows the catalyst with high specific surface area and rich attachment sites, so that nickel-molybdenum alloy particles can be highly dispersed on the catalyst, more active sites are exposed, gas can easily participate in the reaction, and the catalytic activity of the hydrogen oxidation reaction is further improved.

The present disclosure relates to a noble metal single atom or cluster-porous molybdenum carbide / carbon nanocomposite using dynamic arrangement of noble metal single atoms or clusters, a method for preparing the same, a catalyst for hydrogen evolution reaction or hydrogen oxidation reaction including the same, and an electrode including the catalyst. The noble metal single atom or cluster-porous molybdenum carbide / carbon nanocomposite of the present disclosure, which is prepared by uniformly bonding a noble metal catalyst only on molybdenum carbide in the form of single atoms or clusters in atomic scale through selective dynamic arrangement, may have remarkably improved catalytic activity and kinetic characteristics since the utilization of the noble metal is improved through selective dynamic arrangement of the noble metal catalyst, may have high stability due to strong interaction between the noble metal catalyst and the molybdenum carbide, and may have high tolerance to carbon monoxide.In addition, the use of the noble metal can be decreased and the nanocomposite can be used as a catalyst for electrochemical hydrogen evolution reaction (HER) or hydrogen oxidation reaction (HOR) under acidic and basic conditions because it has superior catalytic activity, high stability and high tolerance to carbon monoxide. Furthermore, it can be prepared at low cost by a simple synthesis method and has good commercial viability.

A hybrid electrochemical device configuration that comprises a first electrode that includes a redox reactive material or an alloy based on a transition metal, a second electrode that includes a multi-functional catalyst to catalyze hydrogen evolution reaction, hydrogen oxidation reaction, and water oxidation reaction at the second electrode, a separator disposed between the first and second electrode, an electrolyte disposed between the first electrode and the second electrode, and a conduit which provides the means to compensate for water loss in the electrolyte during electrochemical device operation. At least one valve is included that connects the electrolyte management system to the conduit system and a valve to connect the gas formed in the electrode to the gas management system. The electrochemical device configurations include several individual devices stacked on top of each other and separated from each other using separation plates.

A process for preparing a catalyst, as well as a catalyst, the catalyst comprising an oxygen evolution reaction electrocatalyst OER, a hydrogen oxidation reaction HOR electrocatalyst, and a particulate solid support are described. The OER electrocatalyst and the HOR catalyst are both supported on the particulate solid support. The OER is deposited from an aqueous mixture comprising a particulate solid support and a halide free metalate which comprises iridium and / or ruthenium. The pH of the mixture is reduced to ≤7 to precipitate the oxygenated metal into the solid particulate support. In the process, the OER electrocatalyst is deposited before the HOR electrocatalyst. The catalyst may be incorporated into a catalyst coated membrane (CCM) and used in a fuel cell. [Figure 1a]

The invention relates to a preparation process of a bifunctional Ru / C catalyst applied to coupling thermocatalytic methanol dehydrogenation and electrocatalytic hydroxidation reaction, belonging to the technical field of methanol hydrogen production. TDI industrial waste residue is used as a raw material, and through the links of pyrolysis activation, supercritical methanol modification, bimetal freezing loading, activation, interface bonding construction, hydrophobic layer coating and the like, the Ru / C catalyst is prepared. The catalyst solves the problems that an existing Ru / C catalyst is sensitive to CO poisoning, easy to sinter at a high temperature, high in component and the like, the Ru utilization rate is high, the activity attenuation is reduced after long-time operation, the components are effectively reduced, and the catalyst is suitable for the process requirements of methanol hydrogen production-synthesis gas co-production.

Disclosed is a catalyst for hydrogen evolution reaction or hydrogen oxidation reaction, which is a catalyst that can be used under alkaline conditions and has significantly improved kinetic characteristics compared to existing commercial platinum catalysts. The present invention provides a catalyst for electrochemical hydrogen reaction under alkaline conditions and a method for preparing the same, and a ruthenium-based catalytic electrode containing the same, which can be used as an electrode for anion exchange membrane-based water electrolysis cell and fuel cell, wherein the catalyst has 2 to 20 ruthenium supported in an aggregate form on the surface of a molybdenum carbide-carbon nanocomposite carrier.

The present invention relates to the technical field of new energy materials and the field of electrocatalytic water splitting, and specifically to a single-site selenium-modified platinum wrinkled nanoparticle catalyst, a preparation method, and an application. The present invention obtains amorphous PtSe2 WNPs by a hydrothermal method and forms a unique non-metallic single-site structure through a subsequent heat treatment process to obtain a Pt-based nanomaterial rich in single-atom selenium. A strong interaction occurs between the single-site Se and the adjacent Pt atoms, causing the Pt to be in an electron-deficient state, thereby optimizing the adsorption and desorption of reaction intermediates on the Pt site and reducing the dissociation energy barrier of water molecules on the Pt site, ultimately improving the alkaline HOR / HER catalysis of the Pt-based nanomaterial. In addition, the Pt-based nanomaterial produces a defective structure, thereby controlling the activation of reactants and the adsorption and desorption of intermediates in the catalytic reaction, and promoting the kinetic process of hydrogen evolution reaction and hydrogen oxidation reaction under alkaline conditions.

The invention relates to the technical field of fuel cells and water electrolysis, in particular to a defect Ru nanocluster-oxygen coordinated Ru monatomic double-active-site porous nanosheet electrocatalyst for hydrogen hydroxide precipitation and a preparation method of the defect Ru nanocluster-oxygen coordinated Ru monatomic double-active-site porous nanosheet electrocatalyst. And preparing the defect Ru nanocluster-oxygen coordinated Ru monatomic double-active-site porous nanosheet electrocatalyst. The invention has the following advantages: in the defective Ru nanocluster-oxygen coordinated Ru monatomic double-active site porous nanosheet electrocatalyst prepared by low-temperature self-assembly, carbonization, acid pickling, wet impregnation and in-situ reduction, the defective Ru nanoclusters and oxygen coordinated Ru monatomic double-active sites are highly dispersed and adjacent to each other; in addition, the electrocatalyst has a large specific surface area and high porosity, and utilization of active sites is facilitated. The electrocatalyst has very high electrocatalytic activity, and is suitable for a hydroxide reaction of a hydroxyl exchange membrane fuel cell anode and a hydrogen evolution reaction of an electrolyzed water cathode.

The invention discloses an anti-CO poisoning PtRu / C catalyst as well as a preparation method and application thereof, and belongs to the technical field of fuel cells. According to the preparation method, firstly, the surface of a carbon carrier is modified through cooperation of acid oxidation and high-temperature annealing, then PtRu alloy particles are accurately loaded by combining an ethylene glycol reduction method, and the high-dispersion carbon-loaded PtRu catalyst is obtained; the catalyst prepared in the invention has high hydroxidation reaction catalytic activity and CO poisoning resistance, and can significantly improve the stability and working efficiency of a fuel cell in impurity-containing hydrogen when applied to a fuel cell anode catalytic reaction.

The present invention discloses an iridium-loaded molybdenum carbide nanoflower sphere and its preparation and application in the hydrogen oxidation reaction, relating to the field of electrocatalytic technology. Compared with the prior art, the present invention provides an iridium-loaded molybdenum carbide with a specific nanoflower sphere structure and its preparation method. Its controllable nanospherical morphology gives it a relatively broad application prospect, showing high catalytic activity, stability and conductivity in the hydrogen oxidation reaction, especially suitable for the hydrogen oxidation reaction in alkaline media, and can provide practical guidance for the development of efficient molybdenum-based electrocatalytic catalysts.

The invention discloses a ruthenium-platinum sub-nano alloy catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. The ruthenium-platinum sub-nano alloy catalyst provided by the invention comprises ruthenium-platinum alloy, the particle size of the ruthenium-platinum sub-nano alloy catalyst is less than or equal to 10nm. Based on the discovery that ruthenium shows higher alkaline hydrogen evolution activity than platinum under alkaline conditions, ruthenium and platinum are matched to construct the ruthenium-platinum alloy catalyst, respective advantages of ruthenium and platinum can be combined, the loading amount of platinum is reduced, the catalytic activity of alkaline hydrogen evolution reaction and alkaline hydrogen oxidation reaction is remarkably improved, and the catalytic activity of the catalyst is improved. Moreover, the sub-nanometer size provides sufficient active sites for the reaction, and the catalyst has a good application prospect in hydrogen evolution of alkaline electrolytic water or preparation of alkaline hydrogen-oxygen fuel cells.

The invention discloses a green electrochemical ammonia production method, which comprises a reduction reaction tank and an oxidation reaction tank which are separated by a proton conduction / permeable membrane, according to the method, an electrolyte containing metal salt capable of participating in electrochemical reaction, an aromatic mediator and an organic solvent is mainly utilized, and high-efficiency conversion from nitrogen to ammonia gas is realized under the conditions of normal temperature and normal pressure; the cathode is subjected to lithium deposition and nitrogen activation reaction, lithium nitride is generated through an aromatic mediator, and ammonia gas is released through protonation; the anode performs a hydroxide reaction to provide a continuous and stable proton source; the method has high selectivity, energy efficiency and modularization potential, can replace a traditional high-energy-consumption Harber method, and is widely applied to green manufacturing procedures of ammonia fuel, fertilizer and hydrogen storage carriers.

The invention discloses a preparation method of a vanadium carbide hollow nanosphere loaded platinum cluster catalyst and an application of the vanadium carbide hollow nanosphere loaded platinum cluster catalyst in a hydroxide reaction, relates to the technical field of electrocatalysis, and provides a preparation method of vanadium carbide with a specific hollow nanosphere structure and a loaded platinum cluster of the vanadium carbide hollow nanosphere structure compared with the prior art. According to the present invention, the controllable nanosphere morphology provides the wide application prospect, the high catalytic activity and the high stability in the hydrogen oxidation reaction are provided, the catalyst is especially suitable for the hydrogen oxidation reaction in the alkaline medium, and the feasible guidance can be provided for the development of the efficient vanadium-based electrochemical catalyst.

The invention discloses an IrSA-Ni3N-t twin crystal nanosheet electrocatalyst as well as a preparation method and application thereof, and belongs to the technical field of two-dimensional nano material catalysts. According to the preparation method, the Ir-atom-doped Ni3N twin crystal nanosheet is prepared by simply nitriding the Ir-substituted nickel hydroxide nanosheet through a high-temperature annealing method. According to the prepared IrSA-Ni3N-t twin crystal nanosheet electrocatalyst, Ir monatomic is doped in Ni3N crystal lattices to reduce stacking fault energy, twin crystals are induced to be formed through high-temperature nitridation, the capacity of a reaction interface for hydroxyl adsorption and transmission and hydrogen bond network connectivity is effectively adjusted, and therefore the alkaline hydroxide reaction performance is improved. The catalyst shows catalytic activity, CO tolerance and long-term stability which are obviously superior to those of a commercial platinum-carbon catalyst in an anion exchange membrane fuel cell anode hydroxide reaction.