47 results about "CO poisoning" patented technology

The invention relates to the field of fuel cell anode catalysts, in particular to a preparation method of a Pd / h-BNNSs / rGO composite catalyst for a direct ethanol fuel cell, which comprises the following steps: taking reduced graphene oxide (rGO) as a substrate and compounding 5-20% by mass of hexagonal boron nitride nanosheets (h-BNNSs) to form a composite carrier; palladium (Pd) nanoparticles accounting for 16 + / -0.5 wt% of the total mass of the catalyst are loaded on the catalyst; the preparation method mainly comprises the following steps: preparing graphene oxide (GO) by an improved Hummer method, carrying out ultrasonic dispersion on GO and h-BNNSs, carrying out hydrothermal reaction at 180 DEG C for 6 hours, carrying out freeze drying to prepare a composite carrier, and loading Pd by a NaBH4 reduction method. The catalyst shows excellent performance on ethanol electrooxidation in an alkaline medium, has an electrochemical active area up to 202.31 m < 2 > / g, peak current density (5.9 times of commercial Pd / C) of 5549.0 mA / mg, excellent stability that activity attenuation is only 50% after 300 cycles, and remarkably improved CO poisoning resistance (the Jf / Jb ratio reaches 1.35), and shows strong industrial application potential.

The application provides a Pt-based catalyst with (1x2)-(110) surface structure for catalyzing CO oxidation and a preparation method thereof. The preparation method of the catalyst is as follows: an oxide carrier and a platinum source are ground and loaded, and after heat treatment under a specific atmosphere, Pt-carrier powder is obtained; then the Pt-carrier powder is calcined with a mixed gas of CO and O2 at a certain temperature for a certain time, so that a Pt-based catalyst with Pt surface with (1x2) structure for catalyzing CO oxidation is prepared in situ. The Pt-based catalyst has the following characteristics: the (1x2) structure of the (110) surface of Pt nanoparticles changes the gas adsorption behavior, and establishes double active sites respectively beneficial to adsorption of O2 and desorption of CO, so that the problem of 'CO poisoning' in the Pt catalytic reaction can be significantly relieved during catalytic oxidation of CO. Compared with other catalysts with other structures, the Pt-based catalyst with the (1x2) special structure has more excellent CO catalytic oxidation activity, and has more practical application value.

The invention discloses an anode CO poisoning resistant catalyst and a preparation method thereof. The preparation method comprises the following steps: step 1, preparation of a nitrogen-doped carbon carrier: dispersing carbon black in a concentrated nitric acid solution for hydrothermal reaction; and after the reaction is finished, washing and drying the precipitate, and carrying out heat treatment in an ammonia gas atmosphere to obtain the nitrogen-doped carbon carrier. Step 2, preparation of a catalyst precursor: dispersing the nitrogen-doped carbon carrier in water, adding a platinum precursor and a ruthenium precursor, uniformly mixing, and drying to obtain the catalyst precursor; and step 3, preparation of the anti-anode CO poisoning catalyst: placing the catalyst precursor in a reducing atmosphere for rapid thermal reduction, and cooling to obtain the anti-anode CO poisoning catalyst. Carbon black is modified through concentrated nitric acid and ammonia gas, the carbon carrier uniformly loaded with nitrogen active sites is obtained, and a basis is provided for subsequent uniform distribution of Pt-Ru particles on the C carrier.

The present invention discloses a rotary tamping system for a high-silicon alloy closed electric furnace, characterized in that it includes a rotary furnace cover, a material surface processing device, and a sealing system; by arranging a circular track on the furnace cover platform, and then the driving device drives the movable cover to rotate along the circular track, the material surface processing device can perform circular motion or reciprocating motion between fixed angles along the furnace body along with the rotating furnace cover, so that the rotary furnace cover can realize automatic tamping of materials, avoid manual operation, improve the production environment, and greatly reduce the risk of safety accidents. The present application meets the requirements for tamping of high-silicon alloy electric furnaces in a closed smelting state, avoids the risk of CO poisoning caused by flammable and explosive gases such as CO in production from overflowing the furnace cover, or the risk of CO flash explosion during the process of opening the furnace door; at the same time, the split rotary furnace cover is conducive to reducing the number of furnace cover hangings and the size of their load, helps to optimize the plant structure design, and reduces the cost of civil engineering investment.

This invention discloses the application of a Ni-based catalyst in the anti-CO poisoning hydrogenation reaction of a liquid organic hydrogen support, aiming to solve the technical problem of CO poisoning in existing LOHC hydrogenation catalysts. It uses CO-containing crude hydrogen as the hydrogen source to achieve the hydrogenation reaction. The Ni-based catalyst has an M / Ni reverse-phase structure, using hydrogen-dissociated metallic Ni as the support, and loading nano-metal oxide M as the supported phase to construct reverse-phase interfacial active sites. The metal M is a combination of Zr and Al, with the molar fraction of the supported phase metal M ranging from 10% to 25% based on 100% of all metals in the catalyst. The catalyst preparation method of this invention is simple and easy to implement, possessing a non-traditional supported reverse-phase structure. When applied to the anti-CO poisoning hydrogenation reaction, it exhibits superior activity compared to traditional supported catalysts. Furthermore, the reaction system is clean, safe, and reproducible, allowing for effective recycling and making it suitable for industrial production, showing promising application prospects.

The invention relates to a preparation method and application of a bimetallic catalyst resistant to CO poisoning. The catalyst comprises the following components in percentage by weight: 0.5% of Pt, 0.5% of Ru and 99% of TiO2. The bimetallic PtRu / TiO2 catalyst resistant to CO poisoning is developed by using an isovolumetric-co-impregnation method through a lattice matching induced epitaxial growth strategy, the electronic structure of the catalyst can be adjusted, the CO poisoning resistance of the catalyst can be effectively enhanced, and the bimetallic PtRu / TiO2 catalyst still shows excellent nitrobenzene hydrogenation performance under the conditions that the temperature is 35 DEG C and the CO content is 5000 ppm. The catalyst has the advantages of simple and easy synthesis process, mild preparation conditions, easy industrial amplification production, and wide application prospects.

The invention provides a fuel cell anode catalyst layer preparation method, which comprises: S1, mixing a Ru precursor and an Ir precursor, dispersing to obtain a mixed solution, adding an alkaline solution, carrying out a complexation reaction to obtain a mixture, calcining the mixture, washing, and drying to obtain a RuIrO2 catalyst; s2, mixing a RuIrO2 catalyst, a platinum-based catalyst, a solvent and a perfluorosulfonic acid resin solution, and dispersing to obtain catalyst layer slurry; and S3, coating a substrate with the catalyst layer slurry, and drying to obtain the anode catalyst layer. The RuIrO2 catalyst is added into the fuel cell anode catalyst layer, Ru provides CO poisoning resistance, IrO2 serves as an OER catalyst to enhance the antipole resistance, Ru atoms can effectively reduce the d band center of Pt, the CO tolerance of the fuel cell is improved, and the membrane electrode containing the fuel cell anode catalyst layer has CO poisoning resistance and antipole resistance under low loading capacity.

The invention belongs to the technical field of hydrogen energy and fuel cell catalyst preparation, and particularly relates to a carbon-loaded palladium-tin intermetallic compound and a preparation method and application thereof. The preparation method comprises the following steps: dispersing palladium salt, tin salt and a carbon carrier in a solvent, ultrasonically mixing, heating until the solvent is evaporated, drying an obtained solid product, and grinding to obtain precursor solid powder; and heating and reducing the precursor solid powder in a reducing atmosphere to obtain the carbon-loaded palladium-tin intermetallic compound. By introducing low-melting-point and relatively-cheap metallic tin, not only can the formation temperature of intermetallic compounds be reduced and the energy consumption be reduced, but also more OH and CO adsorption and desorption sites can be provided by doping the tin element, the electro-catalytic activity and the CO poisoning resistance can be improved, and the preparation method is simple and easy to implement. The problems that hydrogen energy and fuel cell catalysts are poor in activity, the preparation method is tedious, and the CO poisoning resistance is poor are effectively solved.

The present application relates to the technical field of low-carbon metallurgical CO2 reduction catalyst, and specifically discloses a single-atom Mo loaded titanium dioxide hollow sphere, a preparation method and application thereof. The present application inhibits CO from occupying the active center from the adsorption energy level through the electronic regulation of Mo sites, and at the same time, hinders CO from approaching the active center from the mass transfer level by using the hollow confinement structure of TiO2. The synergistic effect of the two significantly improves the stability and selectivity of the catalyst in a low-concentration CO2 atmosphere. Experiments show that in a simulated industrial low-concentration CO2 atmosphere (CO2 volume fraction 15%), the activity of the catalyst does not show obvious attenuation after 16 hours of continuous reaction, and the Mo sites do not show obvious CO poisoning and deactivation after the reaction, proving that the catalyst of the present application has broad application prospects and industrialization promotion value in the fields of CO2 resource utilization of industrial CO-containing exhaust gas and syngas purification.

The application relates to the hydrogen storage technical field and particularly relates to a material for improving the CO poisoning resistance of Pd particles in the hydrogen absorption process and a preparation method thereof, which comprises the following steps: 1) preparing MOF-74(M); 2) adding a solution containing a palladium source precursor into the MOF-74(M) drop by drop, drying the Pd / MOF-74(M) after natural volatilization to obtain Pd / MOF-74(M); 3) introducing hydrogen into the Pd / MOF-74(M) to obtain Pd / MOF-74(M); and 4) obtaining the Pd / MOF-74(M) after activation. 2+ / MOF-74(M). 3) introducing hydrogen into the Pd 2+ / MOF-74(M) to obtain Pd / MOF-74(M). 4) obtaining the Pd / MOF-74(M) after activation. The prior art does not have research on improving the CO gas poisoning resistance of palladium in the hydrogen absorption process, and conventional anti-poisoning means alloying will cause problems such as palladium alloy element segregation, hydrogen absorption capacity reduction, hydrogen absorption rate reduction and the like, the inventors of the application propose that the palladium particles are combined with MOF-74(M) to form a Pd / MOF-74(M) composite structure, which can effectively improve the poisoning effect of strong toxic gas CO on palladium in the hydrogen absorption process.

The application discloses an in-situ surface modification method for enhancing the CO2 and CO poisoning resistance of high-density metal-based alloy, which comprises the following steps: 1) carrying out surface modification on the activated dehydrogenated ZrCo-based alloy in a mixed gas of H2 and a modification gas at 350-450 DEG C; the modification gas is at least one of N2 and CO2; and 2) under the condition of dynamic evacuation, cooling the alloy processed in the step 1) to obtain a ZrCo-based alloy with CO2 and CO poisoning resistance. The application adopts the modification strategy of in-situ surface reconstruction, and solves the problem of poor CO2 and CO poisoning resistance of the ZrCo-based alloy. The application has the advantages of simple steps, low cost and high safety, and has important significance for promoting the application and popularization of the ZrCo-based alloy in the field of hydrogen energy.

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 invention belongs to the field of alcohol catalytic oxidation, and particularly relates to a multi-component alloy alcohol oxidation electrode, preparation and application of the multi-component alloy alcohol oxidation electrode in an alcohol fuel cell, and the preparation method of the electrode comprises the following steps: depositing an M1-M2-M3-LDH material on a carbon-based carrier, and then performing reduction treatment to prepare an M1-M2-M3-multi-component alloy carbon-based carrier; and preparing a precursor electrode by taking the M1-M2-M3-multicomponent alloy and carbon-based carrier as an active material, and carrying out CV electrochemical etching in an acidic electrolyte by taking the precursor electrode as a working electrode to prepare the multicomponent alloy alcohol oxidation electrode, wherein M1 comprises at least one noble metal of Pt, Au, Ag, Pd and Ir; m2 comprises at least one divalent metal of Co, Ni, Cu, Zn and Mn; m3 comprises at least one trivalent metal of Ga, In, Bi, Sb and Fe; the molar weight ratio of M1 to M2 to M3 is 1: (1-8): (1-6); the number of CV circulation circles of the CV electrochemical etching is 10 to 100. The material provided by the invention can effectively resist the problem of CO poisoning, and can significantly improve the alcohol catalytic oxidation effect.

The invention relates to the technical field of electrocatalysis, and discloses a hydroxide anode for preparing carbon monoxide through electrochemical reduction of carbon dioxide and a preparation method thereof.The hydroxide anode for preparing carbon monoxide through electrochemical reduction of carbon dioxide comprises a base material and a catalyst arranged on the base material, the catalyst comprises a cobalt-chromium-molybdenum alloy and a coating layer coating the outer surface of the cobalt-chromium-molybdenum alloy, and the coating layer comprises a carbon coating layer and tungsten oxide loaded on the carbon coating layer. The molybdenum element, the cobalt element and the chromium element form an alloy, and CO accumulation is reduced. The surface of the cobalt-chromium-molybdenum alloy is coated with the carbon coating layer, the conductivity of the hydroxide anode is improved, CO molecules are prevented from making contact with the surface of the alloy, in the long-term use process, the activity of a catalyst cannot be reduced due to CO poisoning, the hydroxide reaction can be efficiently conducted in the electrolysis process, the Faraday efficiency is improved, and the stability of the electrode is guaranteed. Tungsten oxide is loaded on the surface of the carbon coating layer, so that the activity and the stability are further improved.

The present invention belongs to the field of electrocatalysis technology, and specifically relates to a method for synthesizing a transition metal phosphide Pt-based composite catalyst with adjustable morphology, including preparing a precursor Fe-DCD, preparing a Fe-Co-DCD precursor, preparing a composite support, and preparing a composite catalyst. Hydrangea-shaped, spherical, and lamellar Pt / Fe2P-CoP-NDC composite catalysts can be obtained by the method of the present invention. Compared with the existing granular form, the present invention increases the specific surface area and improves the pore structure, which can accelerate the reaction kinetics and reaction process of methanol oxidation. At the same time, by regulating the morphology, the interaction force between Pt NPs and the carrier material can be effectively enhanced, the catalytic stability of the Pt-based catalyst in the methanol oxidation reaction can be improved, and the optimization of the Pt particle size, dispersion, surface state, exposed crystal surface, number of active sites, and resistance to CO poisoning plays a key role, thereby improving the catalytic activity of the Pt-based catalyst.

This invention belongs to the field of new energy fuel cell technology, and specifically relates to an anode catalyst with anti-reverse polarity, its preparation method, slurry, and fuel cell. The catalyst includes a support and a Pt-Ru alloy and IrO2 supported on the support, wherein the support is a carbon material support; the particle size of the anti-reverse polarity anode catalyst is 3-5 nm. Addressing the technical deficiencies of existing anti-reverse polarity anode catalysts, this invention proposes an improved anti-reverse polarity anode catalyst. This catalyst uses a carbon material support with superior conductivity and mass transfer capacity compared to metal oxide supports such as TiO2, ZrO2, WO3-Mn, and Nb-TiO2. IrO2, which has high anti-reverse polarity performance, is co-supported with the metal active component Pt-Ru alloy on the carbon material support. The resulting anti-reverse polarity anode catalyst, when applied to a fuel cell, exhibits a reverse polarity time of 171 min and an electrode performance of 1.40 A / cm² after reverse polarity. 2 In addition, this anode catalyst also exhibits excellent resistance to CO poisoning.

The invention discloses a three-way catalyst for a water gas shift reaction as well as a preparation method and application of the three-way catalyst. The three-way catalyst comprises a Si-containing carrier, alpha-MoC loaded on the carrier and active metal M particles selectively and uniformly dispersed on the surfaces of MoC particles. According to the invention, the metal M is accurately positioned on alpha-MoC, and formation of rich M-Mo interfacial active sites in the supported three-way catalyst is promoted; in addition, due to the introduction of the third component carrier, the M / alpha-MoC component is effectively dispersed, and meanwhile, the electronic properties of the M / alpha-MoC component are changed; through modification, CO poisoning on M / alpha-MoC active sites is weakened, and water dissociation is enhanced.

The invention relates to the technical field of fuel cell anode catalysts, in particular to a composite catalyst, a preparation method and application thereof and an anion exchange membrane fuel cell. The invention provides a composite catalyst. The composite catalyst comprises a carrier and Pt loaded in the carrier in situ, the carrier comprises a carbon nanotube and molybdenum oxide in a non-stoichiometric state; the mass percentage of Pt in the composite catalyst is 1-5%. The composite catalyst can reduce the loading amount of Pt, and has excellent catalytic activity and CO poisoning resistance.

The invention relates to the technical field of new energy and new materials, and discloses an anti-CO poisoning ruthenium group cluster hydrogen oxidation electrocatalyst and a preparation method and application thereof.The method comprises the steps that glucose, dicyandiamide and indium salt are evenly mixed in a solvent, then evaporation concentration, freezing and freeze drying treatment are conducted, and a solid precursor is obtained; the preparation method comprises the following steps: carrying out primary calcination on a solid precursor in an inert atmosphere to obtain an indium monatomic modified nitrogen-oxygen co-doped carbon carrier, dispersing the indium monatomic modified nitrogen-oxygen co-doped carbon carrier in a solvent, adding a ruthenium salt solution for dipping, drying, and carrying out secondary calcination in a reducing atmosphere to obtain the ruthenium group cluster hydrogen oxidation electrocatalyst with an ultrathin sheet structure. The preparation method of the catalyst is based on a step-by-step wet chemical synthesis method and comprises the following steps: firstly, constructing an indium monatomic modified nitrogen-doped carbon carrier (In1 atCNO), then loading ruthenium clusters on the carrier through liquid phase impregnation and subsequent reduction treatment, and finally obtaining the target catalyst. The method has the advantages of high universality, short reaction time, simplicity and convenience in operation and the like.

To provide RcoM protein-based carbon monoxide scavengers and preparations for treating carbon monoxide poisoning.SOLUTION: Disclosed herein is a method for rapid elimination of carbon monoxide (CO) from CO-bound hemoglobin, myoglobin and cytochrome C oxidase in a subject with CO poisoning. The disclosed therapeutic method comprises use of a rationally designed and modified regulatory factor of CO metabolism (RcoM) protein and pharmaceutical compositions thereof, which scavenge carbon monoxide from poisoned tissue. The recombinant RcoM composition is infused into blood to rapidly sequester carbon monoxide and limit the toxic effects of carbon monoxide on cellular respiration, oxygen transport and oxygen utilization.SELECTED DRAWING: None

The invention discloses a fuel cell activation and CO poisoning performance recovery method, which comprises the following steps: 1) setting fuel cell activation conditions including temperature and back pressure, and introducing humidified nitrogen into a cathode and an anode; 2) after the temperature and the back pressure reach set conditions, introducing humidified hydrogen into the anode of the fuel cell, and introducing humidified air or oxygen into the cathode of the fuel cell; (3) activating the fuel cell by adopting variable current discharge; 4) carrying out polarization curve test on the fuel cell, introducing humidified pure hydrogen or 50 ppm CO mixed hydrogen into the anode, and introducing humidified air or oxygen into the cathode; and (5) carrying out CO poisoning performance recovery on the fuel cell, introducing nitrogen into the anode, then introducing oxygen-containing mixed gas into the anode, and applying high-frequency pulse voltage. According to the activation method disclosed by the invention, the activation process of the fuel cell is shortened to be within 2 hours, the performance activation of the fuel cell is quickly realized, and CO desorption is realized through a series of operation working conditions, so that the performance of the fuel cell is recovered, and the performance recovery rate reaches 97.45%.

This invention relates to the field of low-carbon metallurgical CO2 reduction catalyst technology, specifically disclosing a single-atom Mo-supported hollow titanium dioxide sphere, its preparation method, and its applications. This invention inhibits CO from occupying the active center at the adsorption energy level through electronic regulation of the Mo sites, while simultaneously utilizing the hollow confinement structure of TiO2 to hinder CO from approaching the active center at the mass transfer level. The synergistic effect of these two methods significantly improves the stability and selectivity of the catalyst in a low-concentration CO2 atmosphere. Experiments show that in a simulated industrial low-concentration CO2 atmosphere (CO2 volume fraction 15%), the catalyst's activity did not significantly decrease after 16 hours of continuous reaction, and no obvious CO poisoning deactivation was observed at the Mo sites after the reaction. This demonstrates that the catalyst of this invention has broad application prospects and industrial promotion value in the fields of CO2 resource utilization from CO-containing industrial tail gas and syngas purification.

The invention belongs to the technical field of catalysts, and particularly discloses a Pd / BEA-coated CeOx core-shell catalyst with high NOx adsorption and high CO poisoning resistance and a preparation method and application thereof.The Pd / BEA-coated CeOx core-shell catalyst takes a Pd / BEA molecular sieve as an inner core and CeOx as a shell layer, the mass ratio of the Pd / BEA molecular sieve to the CeOx is 1: (0.25-0.75), the Pd / BEA molecular sieve takes a molecular sieve as a carrier, Pd is loaded on the molecular sieve carrier through an impregnation method, and the loading amount of Pd is 0.8-1.2 wt%. The catalyst provided by the invention has excellent low-temperature NOx adsorption performance, can rapidly capture NOx, and lays a foundation for subsequent conversion; the catalyst still shows excellent stability after CO poisoning, and the problem of inactivation of a traditional Pd / BEA catalyst can be avoided; the catalyst raw materials are environment-friendly and cheap, the preparation process is simple and easy to operate, special equipment is not needed, and industrial large-scale production is facilitated.

The invention discloses a platinum-based catalyst based on molybdenum carbide nanofibers as well as a preparation method and application of the platinum-based catalyst. The preparation method comprises the following steps: preparing a [CH3COCH = C (O-) CH3] 2MoO2 / C nanofiber material in advance through an electrostatic spinning process, carrying out high-temperature carbon heat treatment to obtain a Mo2C-coated CNFs nanofiber carrier, and loading platinum nanoparticles on the carrier by using a mode of carrying out physical adsorption first and then carrying out heat adsorption to obtain the Pt / Mo2C-coated CNFs catalyst material. The platinum nanoparticles are loaded on the molybdenum carbide nanofiber carrier, the high activity effect of the platinum nanoparticles and the corrosion resistance and efficient charge transfer effect of molybdenum carbide are used for coordinating and optimizing the adsorption effect of an acidic HOR reaction intermediate, and the CO poisoning resistance and phosphoric acid poisoning resistance of the material are improved; and finally, the catalytic activity of the acidic HOR is improved.

The invention belongs to the technical field of alkaline fuel cells and water electrolysis hydrogen production electrocatalysis, and provides a rare earth fluoride composite catalyst for alkaline methanol oxidation and hydrogen evolution, the catalyst takes a rare earth fluoride modified transition metal-carbon composite material as a carrier to load a multi-component metal active center, a multi-metal catalyst system with an NM / TM-REFx / C structure is constructed by using a multi-metal catalyst system, NM is a noble metal, TM is a transition metal, RE is a rare earth element, and the mass fraction of each component is as follows: 1 wt%-9 wt% of NM, 2 wt%-15 wt% of TM and 0.5 wt%-5 wt% of RE; through the electronic regulation and control and interface synergistic effect of the rare earth fluoride, the problems that a platinum-based catalyst is large in precious metal consumption, poor in CO poisoning resistance, high in cost and the like in the alkaline methanol oxidation and hydrogen evolution reaction are solved, and the method is suitable for the low-temperature, efficient and low-energy-consumption alkaline methanol oxidation and hydrogen evolution process.

The present invention relates to a Pd single-atom catalyst resistant to CO poisoning, wherein the main active component is palladium, the auxiliary active component is molybdenum carbide, and the molybdenum carbide is a nanoparticle of size 2-3nm, the nanoparticles are embedded in a two-dimensional nitrogen-doped carbon support, and palladium is dispersed at the atomic level on the molybdenum carbide; in the catalyst, the Pd content is 0.05wt% to 1wt%, the Mo content is 1wt% to 15wt%, and the molar ratio of Mo to Pd is 50:1 to 3:1. The present invention also relates to a method for preparing the above-mentioned Pd single-atom catalyst resistant to CO poisoning, and the application of the above-mentioned Pd single-atom catalyst resistant to CO poisoning in acetylene selective hydrogenation. In the catalyst, the active component palladium is uniformly dispersed at the atomic level on the MoC-NC support, and the catalyst has high activity and selectivity for acetylene selective hydrogenation reaction, showing high resistance to CO poisoning.

The invention relates to the technical field of electrocatalysis, and discloses a gadolinium monatomic doped ruthenium / ruthenium oxide heterostructure electrocatalyst and a preparation method and application thereof.The preparation method comprises the steps that benzenetricarboxylic acid and gadolinium nitrate hexahydrate are dissolved in ultrapure water for ultrasonic treatment, and a precursor is obtained through a heating reaction, centrifugation and drying; calcining the precursor at the temperature of 700 to 1000 DEG C in an argon atmosphere to prepare a Gd2O3 MOF material; and adding the Gd2O3 MOF material, polyvinylpyrrolidone and ruthenium chloride hydrate into ethylene glycol, carrying out a reaction at 100-180 DEG C, and carrying out centrifugation, washing and vacuum drying on the reaction product to obtain the gadolinium monatomic doped ruthenium / ruthenium oxide heterostructure electrocatalyst. The catalyst disclosed by the invention shows excellent electro-catalytic performance in an alkaline HOR reaction; a heterogeneous interface optimizes an electronic structure and improves intrinsic activity; the gadolinium monatomic in the crystal lattice enhances the structural stability and CO poisoning resistance, and a high-performance material solution is provided for alkaline hydrogen fuel cell anode catalysis.

The invention discloses an anti-CO poisoning membrane electrode and a preparation method thereof, and a fuel cell, and belongs to the technical field of fuel cells, the membrane electrode comprises an anode gas diffusion layer, an anode catalyst layer, a proton exchange membrane, a cathode catalyst layer and a cathode gas diffusion layer which are arranged in sequence, the anode gas diffusion layer and the cathode gas diffusion layer can cover the bipolar plate flow field region and the bipolar plate transition region; the positions of the anode catalyst layer and the cathode catalyst layer correspond to the bipolar plate flow field region; the surfaces of the sides, facing the proton exchange membrane, of the anode gas diffusion layer and the cathode gas diffusion layer covering the bipolar plate transition region are coated with anti-CO catalyst layers; and the CO poisoning-resistant catalyst layer in the transition region is used for treating hydrogen entering the flow field region in advance, so that the reduction of battery performance caused by CO entering the flow field region is reduced.

The invention provides an NC loaded Rh monatomic and Dy2O3 catalyst and a preparation method and application thereof.The preparation method comprises the steps that zinc nitrate, an Rh precursor and a Dy precursor are dissolved in methyl alcohol, ultrasonic dispersion is conducted, and a solution A is obtained; dissolving 2-methylimidazole in methanol, and carrying out ultrasonic dispersion to obtain a solution B; mixing the solution A and the solution B, carrying out hydrothermal reaction on the obtained mixed solution, cooling, centrifuging, collecting nanocrystals, and washing with methanol to obtain RhDy ZIF-8; and roasting the RhDy ZIF-8, cooling, and grinding to obtain the Dy2O3-Rh / NC catalyst. According to the NC-loaded Rh single atom and Dy2O3 composite material obtained by the method, high-dispersion single atom activity is maintained, and meanwhile, Dy2O3 and Rh single atoms cooperate to endow a catalyst with excellent CO poisoning resistance and FAOR resistance through unique oxyphilicity of Dy2O3, so that the NC-loaded Rh single atom and Dy2O3 composite material shows huge application potential in high-concentration formic acid fuel cells.

The application belongs to the technical field of electrocatalysis, and particularly relates to a single-atom modified multi-element nano-alloy catalyst preparation and methanol fuel cell application. The application first synthesizes a chromium single-atom catalyst (Cr-SAC), then uses the Cr-SAC as a carrier substrate, and uses an electrochemical deposition method to load palladium (Pd), cobalt (Co) and nickel (Ni) metal precursors, and finally obtains a single-atom modified multi-element nano-alloy catalyst PdCoNi / Cr-SAC. The single-atom modified multi-element nano-alloy catalyst synthesized by the method has good conductivity, the single atoms and the multi-element nano-alloy are uniformly distributed on the substrate, the active sites are dense, the CO poisoning resistance is strong, and the catalytic activity and stability of the methanol oxidation reaction are improved, so that the direct methanol fuel cell with the PdCoNi / Cr-SAC catalyst as the anode has super-high energy conversion efficiency and long-term operation stability.