1905 results about "Oxygen evolution" patented technology

Nanomaterials and methods of preparation and use thereof, are disclosed. The nanomaterials include a non-noble metal substrate and noble metal atoms on a surface of the non-noble metal substrate. The noble metal atoms simultaneously coordinate with a halogen and oxygen. The substrate has a large specific surface area and a large electrochemical active area, and the surface coordination environment of the noble metal affects the electronic structure and catalytic activity of a resulting catalyst. The noble metal surface coordination structure may be regulated and controlled by a synthesis temperature, an alkalinity, a reaction time, and an electrodeposition voltage range. A hydroxide ion and the halogen coordinate with the noble metal, exhibiting an unsaturated pentacoordinate state. Doping the substrate with reducing metal ions may increase the loading capacity, anchor the noble metal atoms, and improve anodic oxygen evolution and cathodic hydrogen evolution in seawater electrolysis.

The invention relates to a preparation method of a three-dimensional ferrocobalt metal oxide oxygen evolution catalyst. According to the method, foamed nickel is selected as a carrier, the foamed nickel is pretreated, a metal ion and ethanol mixed solution is evenly adsorbed to the surface of the foamed nickel, then open fire ignition is carried out, and a second-level self-limiting combustion process is carried out, so that metal ions form a ferrocobalt metal oxide material with a three-dimensional network structure in situ on the surface of the foamed nickel. The method is simple and easy to implement, a target product can be generated within second-level time, and the area of a foamed nickel matrix is adjusted according to needs, so that the three-dimensional ferrocobalt metal oxide catalyst is prepared on a large scale. The material obtained by the invention is used as an oxygen evolution anode catalyst, and the three-dimensional network-shaped ferrocobalt metal oxide oxygen evolution catalyst shows excellent electrochemical performance.

The invention discloses a high-current-density long-term stable electrocatalytic oxygen evolution catalyst as well as a preparation method and application thereof, and particularly relates to the field of catalysts. Comprising the following steps: mixing a salt template, ruthenium salt powder and chromium salt powder to obtain mixed powder, and grinding the mixed powder to obtain a precursor; placing the precursor in a reaction container for a molten salt reaction, and cooling a reaction product with water to obtain a catalyst precursor; and adding the catalyst precursor into an acid solution for etching to obtain the high-current-density long-term stable electro-catalytic oxygen evolution catalyst. The electron transmission capability and Ru-O covalence of the catalyst are continuously regulated and controlled at the same time through continuous doping of chromium, the doping amounts of chromium in the catalyst located at the poles of the two are the same, the catalyst has high catalytic activity due to the optimal electron transmission capability and Ru-O covalence, dissolution of ruthenium dioxide in the electrooxidation reaction process is effectively hindered, and the catalytic activity of the catalyst is improved. The stability of the catalyst in an acidic oxygen evolution reaction is greatly improved.

The invention belongs to the technical field of electrocatalyst material preparation, and discloses a long-range disordered localized CoOOH ultrathin nanosheet electrocatalyst as well as a preparation method and application thereof, fluorine-doped cobalt selenide nanobelts prepared by a low-temperature annealing method are used as a base material, and the CoOOH ultrathin nanosheet electrocatalyst is prepared by in-situ reconstruction under an alkaline electrolyzed water anode oxygen evolution reaction condition. In the preparation process of the CoOOH ultrathin nanosheet provided by the invention, lattice cobalt is stabilized in the water electrolysis anode reconstruction process through fluorine ions with strong bonding action with cobalt ions, so that the long-range disordered structure of amorphous CoOOH generated after reconstruction is limited by localization, and the alkaline water electrolysis anode reaction performance is improved. The catalyst has activity and durability obviously superior to those of a commercial ruthenium oxide catalyst in industrial application of anion exchange membrane water electrolysis hydrogen production.

The invention discloses an electrocatalyst for acidic oxygen evolution reaction as well as a preparation method and application of the electrocatalyst, and belongs to the technical field of electrolyzed water. The preparation method of the electrocatalyst for the acidic oxygen evolution reaction comprises the following steps: growing a transition metal oxide on a conductive substrate in situ to obtain a transition metal oxide carrier; the transition metal oxide carrier is subjected to plasma treatment and then placed in a precious metal salt solution for a cation exchange reaction, and the electrocatalyst is obtained. The electrocatalyst prepared by the invention has extremely low initial overpotential (187mV) when a water electrolysis reaction is carried out in a 0.5 M H2SO4 solution, has no obvious performance degradation in a continuous acidic water electrolysis process for 4500h, shows very high operation stability, and has great application potential in the aspects of replacing a commercial RuO2 / IrO2 catalyst and reducing electrode preparation cost and acidic water electrolysis.

The invention provides a stable multivalent metal surface doped ruthenium oxide catalyst, a preparation method thereof and application of the stable multivalent metal surface doped ruthenium oxide catalyst in a proton exchange membrane water electrolysis device, and belongs to the technical field of catalysts and preparation thereof. According to the prepared multivalent metal such as molybdenum, niobium, tungsten, tantalum and chromium doped ruthenium oxide catalyst, the active center electronic structure is effectively stabilized due to the flexible valence change of the multivalent metal in the oxygen evolution process, meanwhile, a surface layer can be constructed through surface doping, separation of the active center Ru and lattice oxygen is effectively inhibited, and the stability of the catalyst is improved. The prepared catalyst shows excellent catalytic activity and electrochemical stability in an acidic oxygen evolution reaction, has the advantages of low cost and good catalytic stability, and in addition, can stably operate under relatively high current density as a proton exchange membrane electrolyzed water anode catalyst.

The invention relates to a titanium oxide nanowire supported iridium catalyst as well as a preparation method and application thereof. The catalyst comprises a titanium oxide nanowire carrier and elemental iridium supported on the titanium oxide nanowire carrier. According to the catalyst, the titanium oxide nanowire is used as a carrier, and the catalyst prepared by loading elemental iridium on the titanium oxide nanowire is used as an anode catalyst, so that higher mass specific activity and lower oxygen evolution overpotential can be obtained; the membrane electrode prepared by using the composite material has the characteristics of low noble metal catalyst loading capacity and low electrolytic water decomposition voltage.

The invention relates to the technical field of electrolysis, in particular to a method for assisting electrolysis of a solid oxide electrolytic tank by ammonia gas, a symmetric electrode and a preparation method of the symmetric electrode. According to the method for assisting electrolysis of the solid oxide electrolytic tank with the ammonia gas, NH3 is introduced into the anode side of the solid oxide electrolytic tank for oxidation, CO2 and / or H2O is introduced into the cathode side of the solid oxide electrolytic tank, and the CO2 and / or H2O are / is electrolyzed. The symmetric electrode disclosed by the invention is applied to the solid oxide electrolytic tank, and a symmetric electrode catalyst is square fluorite type cerium oxide and high-entropy alloy which is separated out from doped cerium oxide in situ. The conventional dynamic slow oxygen evolution reaction on the SOEC anode is replaced by a favorable NH3 oxidation reaction, so that the oxygen partial pressure on the anode side can be reduced, the CO2 reduction reaction rate of the cathode is improved, and meanwhile, the power demand of CO2 electroreduction is greatly reduced.

The invention belongs to the technical field of water electrolysis hydrogen production, and particularly relates to an electrolytic hydrogen production electrolytic bath. Comprising a composite electrode assembly; the composite electrode assembly comprises an electrode frame, a bipolar plate, an electrode conductive frame, an oxygen evolution electrode and a hydrogen evolution electrode, the electrode frame is arranged on the outer side of the bipolar plate, the electrode frame and the bipolar plate are both made of plastic materials, the electrode conductive frame is arranged in the electrode frame, and the oxygen evolution electrode and the hydrogen evolution electrode are arranged on the two sides of the bipolar plate respectively and both connected with the electrode conductive frame. By adopting the plastic-based bipolar plate, a sealing effect can be achieved, a sealing gasket part of a traditional electrolytic cell is removed, and the cost of the electrolytic cell is greatly reduced; and the plastic-based bipolar plate, the electrode and the electrode conductive frame are integrated into a whole, so that the assembling and integrating process of the electrolytic cell is greatly simplified.

The invention belongs to the field of microbial electrochemistry and solid organic waste recycling, and discloses a microbial electrosynthesis enhanced solid wastewater hydrolysis and anaerobic digestion biogas high-value utilization system coupling microbial electrosynthesis, organic solid waste electrochemical-biological synergistic hydrolysis oxidation and anaerobic digestion. The system comprises a cathode chamber and an anode chamber which are separated by an ion exchange membrane, an electrochemical driving device and an anaerobic digestion unit communicated with the anode chamber. And the cathode chamber is provided with a cathode electrode and an anaerobic acetic acid production microbial system and is communicated with biogas generated by anaerobic digestion, so that carbon dioxide in the biogas is reduced at the cathode to generate acetic acid and methane-enriched gas is output. The anode chamber is provided with an anode electrode, organic solid waste and a hydrolytic microorganism system are added, electrochemical-biological synergistic hydrolytic oxidation of the organic solid waste and hydrolysates of the organic solid waste is used as an anode reaction, oxygen evolution is inhibited, and oxygen transmembrane migration is reduced; and the hydrolysate in the anode chamber flows into the anaerobic digestion unit to produce biogas, so that the integrated operation of solid wastewater hydrolysis and biogas upgrading is realized.

The invention relates to a NiCoW-CoP / Co3O4 (at) NF self-supporting heterostructure catalyst and a preparation method thereof. The preparation method comprises the following steps: preparing a CoP-coated NF precursor on foamed nickel through a constant potential electrodeposition method, then carrying out annealing treatment in a muffle furnace, and finally carrying out electrodeposition on NiCoW-LDH to obtain the NiCoW-CoP / Co3O4-coated NF material. According to the preparation method, the microsphere material with the surface covered with the dendritic dendrites is synthesized, and exposure of active sites is increased through the special surface structure of the microsphere material. The compounding of the trimetal hydroxide containing high-valence tungsten and the introduction of oxygen vacancies can effectively enhance the local electron density of oxygen atoms on the surface of the catalyst, thereby enhancing the catalytic performance and seawater corrosion resistance of the material. Compared with the prior art, the method disclosed by the invention is simple to operate and low in cost, and the prepared catalyst has high electrocatalytic activity, relatively low hydrogen evolution overpotential and oxygen evolution overpotential and long-time stability. And the method has important theoretical significance and potential application value for developing a bifunctional electrocatalyst suitable for electrolyzing seawater.

The invention relates to an electrochemical carbon dioxide reduction device without a prefabricated anion exchange membrane and application of the electrochemical carbon dioxide reduction device, and belongs to the fields of electrochemistry, carbon dioxide utilization and renewable energy sources. The device comprises an anode for catalyzing an oxygen evolution reaction, a cathode formed by a gas diffusion electrode, an extraction chamber arranged between the anode and the cathode, a cation exchange membrane covering the surface of the anode, a diaphragm covering the surface of the cathode, and ion exchange resin filled in the extraction chamber and used as a solid electrolyte. The device is used for a carbon dioxide reduction reaction, and an extracting solution can be used in an extracting chamber to extract a liquid product solution of carbon dioxide reduction; the components of the liquid product solution only contain the components of the extracting solution and the components of the liquid product. Based on the invention, the use of expensive prefabricated anion exchange membranes with unstable acidic conditions can be avoided, a product with higher purity of a liquid product can be directly obtained, and an additional operation unit for separating the liquid product from metal cations can be omitted.

The invention relates to the technical field of electrocatalysts, in particular to a boron-doped ruthenium dioxide hollow fiber catalyst and a preparation method and application thereof. The preparation method comprises the following steps: preparing calcium alginate fibers from sodium alginate as a raw material through a wet spinning process, mixing the calcium alginate fibers with a boric acid solution, washing and drying to obtain boric acid cross-linked calcium alginate fibers, fully mixing the boric acid cross-linked calcium alginate fibers with a ruthenium trichloride solution, drying to obtain a boric acid cross-linked ruthenium alginate fiber precursor, and carrying out pyrolysis treatment to obtain the boric acid cross-linked ruthenium alginate fiber. Ruthenium ions are converted into ruthenium dioxide nano-particles, boric acid cross-linked alginate fibers are converted into hollow fibers, and boron atoms are doped into ruthenium dioxide crystal lattices to form the boron-doped ruthenium dioxide oxygen evolution reaction electrocatalyst. The boron-doped ruthenium dioxide hollow fiber can be used as a proton exchange membrane electrolytic bath and an electrolyzed water catalyst with excellent performance, and has relatively high catalytic activity and good stability. The raw materials are wide in source, expensive equipment is not needed, and large-scale preparation can be performed.

An oxygen evolution reaction electrocatalyst and a method for preparing said oxygen evolution reaction electrocatalyst are disclosed. The method comprises the steps of contacting a porous zeolite with a solution containing a noble metal precursor to form a noble metal doped zeolite, pyrolyzing the noble metal doped zeolite to form nanocrystals comprising at least the noble metal and a second metal, said nanocrystals being confined within a layer of carbon-based material, wherein the second metal and the carbon-based material are derived from the pyrolyzed zeolite, and annealing said layer of carbon-based material confined nanocrystals to form isolated noble metal atoms singly dispersed within a metal oxide lattice of the second metal as an oxygen evolution reaction electrocatalyst.

The invention belongs to the technical field of electrocatalysis, and particularly relates to a preparation method of a nickel-iron-based transition metal boride / black phosphorus composite oxygen evolution reaction electrocatalyst. The invention provides a preparation method of a ferronickel-based transition metal boride / black phosphorus composite oxygen evolution reaction electrocatalyst, which is characterized by comprising the following steps: synthesizing a quasi-two-dimensional ethylenediamine modified black phosphorus nanosheet (eda-BP) by a hydrothermal method, and carrying out ultrasonic treatment on the surface of the obtained eda-BP to obtain the ferronickel-based transition metal boride / black phosphorus composite oxygen evolution reaction electrocatalyst. The nickel-iron-based transition metal boride / black phosphorus composite oxygen evolution reaction (OER) electrocatalyst (Ni < x > FeyB / eda-BP) is prepared by loading nickel-iron-based transition metal boride (Ni < x > FeyB) through an in-situ chemical reduction method, so that modification of a two-dimensional black phosphorus electrocatalyst is realized; the problems of instability of a quasi-two-dimensional black phosphorus catalyst, serious Fe loss of a nickel-iron-based catalyst, poor reaction kinetics and the like are solved to a great extent, and under the synergistic effect of the two parts, the electro-catalytic oxygen evolution reaction activity and the electro-catalytic stability of the composite catalyst are remarkably improved. The preparation method of the nickel-iron-based transition metal boride / black phosphorus composite oxygen evolution reaction electrocatalyst provides a new thought and a new way for designing and developing a novel efficient and stable oxygen evolution reaction electrocatalyst.

Improved electrocatalysts for promoting a hydrogen evolution reaction (HER) or an oxygen evolution reaction (OER) from alkaline fresh water and seawater are disclosed. By incorporating metals, such as tungsten and rare earth elements, into the nickel molybdenum nitride framework, Ni1-xMoxN, the disclosed electrocatalysts demonstrate improved catalytic activity and stability compared to the original Ni&Ni0.2Mo0.8N catalysts, particularly under high-current alkaline conditions, in water electrolysis for hydrogen and oxygen production.

The invention provides a preparation method of a nickel-based composite oxygen evolution anode for alkalescent electrolyte. According to the invention, nickel-based alloy is used as substrates, two same substrates are respectively used as a working electrode and an auxiliary electrode, two-electrode system electrochemical oxidation reduction treatment at room temperature is carried out in a mixed solution of phosphate, carbonate and chloride, and two reconstructed nickel-based composite oxygen evolution electrodes are obtained at the same time. In the electrochemical oxidation process, nickel ions and other metal (Fe, Co, Cr and Mn) ions are dissolved out from the nickel-based alloy under the etching assistance of chloride ions; in the electrochemical reduction process, water on the electrode is reduced to form hydroxyl. Under continuous oxidation reduction, substance reconstruction is carried out to generate a composite catalyst layer of phosphate, carbonate and hydroxide of nickel and other metals, so that not only can the oxygen evolution activity be improved, but also metal dissolution and corrosion passivation when the catalyst is used in a weakly alkaline solution can be inhibited, and the durability of the electrode is greatly improved.

The invention belongs to the related technical field of electrocatalysts, and discloses a cross array electrocatalyst and a preparation method and application thereof.The preparation method comprises the following steps that a nickel net subjected to corrosion treatment is put into a corrosion solution to be subjected to heat preservation reaction for preset time, and then the cross array electrocatalyst is obtained, the electrocatalyst is provided with a nanosheet array structure which is mutually crossed and supported; wherein hydrochloric acid is used for carrying out corrosion treatment on the nickel net; the etchant solution is obtained by dissolving sodium thiosulfate pentahydrate, nickel chloride hexahydrate, ferrous chloride tetrahydrate and sodium orthovanadate in an ethylene glycol solution. The catalyst prepared by the invention has a nanosheet array structure which is mutually supported in a crossed manner, and the special structure enables the catalyst to construct an ion confinement space, so that adsorption and enrichment of reactants on the interface of the catalyst are facilitated, a local reactant-rich environment is constructed, and excellent electro-catalytic oxygen evolution activity is shown.

The invention relates to a ruthenium nano-cluster / trinickel disulfide heterojunction composite material as well as a preparation method and application thereof. According to the composite material, foamed nickel serves as a substrate material, a Ni3S2 nanosheet array grows on the surface of the substrate material in situ, and ruthenium nanoclusters are anchored on the surface of the Ni3S2 nanosheet array to form the heterojunction composite material. According to the preparation method, the Ni3S2 nanosheet array grows on the foamed nickel substrate in situ, then the composite material with the ruthenium nanocluster anchored on the Ni3S2 surface is prepared through a chemical etching method, and the preparation method is simple, relatively low in cost and suitable for large-scale production; the prepared heterojunction composite material forms a nanosheet array structure and shows a honeycomb structure, so that the catalyst has a relatively large specific surface area, provides more active sites for catalytic reaction, is high in catalytic activity, and can be used as a catalyst applied to hydrogen evolution and oxygen evolution of water electrolysis reaction in electro-catalysis.

The invention relates to the technical field of oxygen evolution catalysts, in particular to a preparation method and application of a monatomic doped ferronickel-based oxygen evolution electrocatalyst, and the preparation method comprises the following steps: growing a NiFe-LDH nanosheet substrate on the surface of a carbon-based carrier in situ through a hydrothermal method, and then precisely regulating and controlling transition metal monatomic doping in combination with an electrochemical deposition technology. The monatomic doped ferronickel-based oxygen evolution electrocatalyst prepared by the preparation method has the advantages of excellent catalytic activity, low cost, greenness and no toxicity.

The invention provides a method for coupling vanadium extraction through ore pulp electrolysis and new energy utilization. The method comprises the following steps: step 1, crushing a vanadium-containing raw material; step 2, adding a leaching agent into the crushed vanadium-containing raw material, and stirring to obtain ore pulp; 3, the ore pulp is placed in an anode of an electrolytic bath, and an oxidation state substance is added into a cathode of the electrolytic bath; step 4, turning on a power supply, carrying out oxidation reaction on vanadium at the anode of the electrolytic cell, and dissolving the vanadium into the solution by the leaching agent at the same time; and the cathode oxidation-state substance is reduced in the electrolytic bath to obtain a reduction-state substance. According to the green vanadium extraction method, vanadium is leached out through ore pulp electrolysis, electrolytic bath anodic oxidation and a leaching agent. When the oxidation-state substance is water or CO2, the method not only realizes reduction of hydrogen or carbon dioxide, but also replaces an anode oxygen evolution process with an oxidation leaching process of vanadium, so that the cost is remarkably reduced.

The invention discloses a surface treatment process of a hydraulic rod and a coating monitoring system, relates to the technical field of electroplating, and aims to solve the problems that various complementary sensing technologies cannot be integrated, information such as thickness, uniformity and microstructure cannot be synchronously acquired in a lossless, in-situ and real-time manner, and closed-loop control cannot be formed based on the information in the background technology. According to the scheme, the method comprises the steps that PR electrolytic degreasing is conducted, a workpiece serves as an anode, an oil film is torn through the oxygen evolution effect, an extremely-thin oxidation film possibly existing on the surface of the workpiece is dissolved, base metal is completely activated, and an optimal combination basis is provided for a follow-up coating; and washing with hot water, namely removing residual alkaline degreasing fluid and emulsified oil stains by using hot water with the temperature higher than 60 DEG C in a stirring and spraying manner. According to the method, multi-dimensional information such as the thickness, the uniformity and the microstructure can be synchronously obtained in a lossless, in-situ and real-time mode in the surface treatment process, closed-loop control is formed based on the information, and it is ensured that plating growth is always located on the optimal track.

The invention provides a method for regulating and controlling cooling time after Joule heating and a high-entropy oxide electrocatalyst based on the method, and belongs to the technical field of electrocatalytic electrolysis of water. According to the method, the relationship between the graphite substrates with different mass area ratios and the cooling time is determined based on the Newton's law of cooling by carrying out volume segmentation on the graphite substrates; the structure and performance of the high-entropy oxide electrocatalyst are regulated and controlled on the basis of a cooling time regulation and control strategy; the prepared high-entropy oxide electrocatalyst has excellent oxygen evolution reaction catalytic activity in an alkaline environment, the structure of the high-entropy oxide electrocatalyst with the cooling time of 0.3 s is a nanowire assembled by fine nano-particles, the high-entropy oxide electrocatalyst shows the optimal electrochemical performance, and under the current density of 10 mA cm <-2 >, the high-entropy oxide electrocatalyst has excellent oxygen evolution reaction catalytic activity. And the overpotential is only 219 mV. The method provided by the invention is simple and efficient, and can be widely applied to preparation and performance optimization of the electrocatalyst.

The invention is suitable for the technical field of photocatalyst preparation, and provides a modified tubular g-C3N4 loaded Ni-CoP photocatalyst and a preparation method thereof. The preparation method comprises the following steps: calcining a carbon nitride precursor in stages to obtain tubular carbon nitride, stirring the tubular carbon nitride with a cobalt and nickel-containing compound and an alkaline compound, washing and drying to obtain a precipitate, calcining, mixing and grinding with a phosphorus-containing compound, calcining again, and modifying the product with polydopamine and polypyrrole to obtain the composite material. The photocatalyst modified by the polydopamine and the polypyrrole and loaded with the Ni-CoP by taking the tubular g-C3N4 as the carrier is obtained. According to the invention, three-in-one synergistic integration of'carrier-modifier-cocatalyst 'is realized, the prepared photocatalyst still keeps tubular morphology and has a larger specific surface area, the requirements of anode oxygen evolution reaction (OER) on rapid charge separation and transmission can be met, meanwhile, the light absorption range is widened, the solar energy utilization rate is increased, and a foundation is laid for efficient OER reaction.

The invention provides an indigo electrochemical reduction reactor using a micro-channel carbon felt electrode and an indigo electrochemical reduction reaction method. A reaction device of the reactor comprises a cathode shell, an insulating spacer, a current collector, a micro-channel carbon felt electrode, a diaphragm, an oxygen evolution electrode, an anode channel and an anode shell, a micro-channel network through which a cathode solution flows is arranged in the micro-channel carbon felt electrode; the oxygen evolution electrode and the carbon felt channel electrode are arranged in parallel and are separated by a diaphragm; the current collector clings to the outer surface of the micro-channel carbon felt electrode; the insulating spacer clings to the outer surface of the current collector; the cathode shell clings to the outer surface of the insulating spacer; an anode channel is arranged between the oxygen evolution electrode and the anode shell, and an anode solution channel is arranged in the anode channel; and heat exchange pipelines are arranged in the cathode shell and the anode shell. The invention further provides an indigo electrochemical reduction reaction method based on the reactor. According to the invention, direct electro-reduction of indigo can be realized in the presence of a chemical reducing agent.

The invention discloses a flowing type vanadium-based electric fuel energy storage and supply system which comprises an electric pile reaction module, an electrolyte driving module and a medium storage module, and the electric pile reaction module comprises an oxygen evolution reaction flowing unit, a vanadium electrolyte flowing unit and an oxygen reduction reaction flowing unit which are arranged adjacently in pairs; a first flow field plate in the oxygen evolution reaction flow unit is provided with a bionic dendritic interdigital first flow channel; a second flow field plate in the vanadium electrolyte flowing unit is provided with a bidirectional spiral interdigital second flow channel; a third flow field plate in the oxygen reduction reaction flow unit is provided with a third multi-stage fractal interdigital flow channel; the medium storage module comprises a vanadium electrolyte storage tank and a reaction medium storage tank, the vanadium electrolyte storage tank and the reaction medium storage tank are arranged on the two opposite sides of the galvanic pile reaction module, the vanadium electrolyte storage tank is connected with the second flow field plate, and the reaction medium storage tank is connected with the second flow field plate and the third flow field plate. According to the system, the integration level of the system is improved on the basis of reducing the cost.

The invention belongs to the technical field of electro-catalysis, and particularly relates to an iridium cluster-loaded gallium oxide material as well as a preparation method and application thereof. The gallium oxide material loaded with the iridium cluster comprises flaky gallium oxide and the iridium cluster loaded on the surface of the gallium oxide, wherein the mass percentage content of iridium in the gallium oxide material loaded with the iridium cluster is less than or equal to 50%. The mass percentage of noble metal Ir in the material is less than or equal to 50%, so that the cost can be reduced; in the electrocatalytic oxygen evolution reaction, after voltage is applied, the gallium oxide material (Ir (at) Ga2O3) loaded with the iridium cluster can generate an in-situ reconstructed Ga-O-Ir interface through bias-induced Ga leaching, the Ga-O-Ir interface remarkably reduces the energy barrier of the oxygen evolution reaction, the reaction activity is greatly improved, and the electrochemical performance (overpotential and cycling stability) is remarkably improved.

The invention discloses a preparation method of a rare earth element doped nickel-based selenide nano-material and application of the rare earth element doped nickel-based selenide nano-material in electro-catalysis water full-hydrolysis reaction. According to the method, nickel salt, cerium salt, selenium dioxide and potassium chloride are prepared into electrolyte, and the electrolyte is subjected to electro-deposition on a foamed nickel substrate to obtain Ce-doped Ni0.85Se nanoparticles growing on foamed nickel. The crystal structure and electron distribution of Ni0.85Se are optimized by doping trace rare earth element cerium, so that the HER and OER performances of the Ni0.85Se are greatly improved. The prepared catalyst is self-supporting closely-packed nanoparticles, the formed amorphous structure is easy to expose more active sites, the catalyst has good electrocatalytic hydrogen evolution and oxygen evolution performance under alkaline conditions, the overpotential in electrocatalysis of nickel-based selenide is greatly reduced, and the electrocatalytic performance of nickel-based selenide is improved. And excellent electro-catalytic activity is shown in electro-catalytic water full hydrolysis. And the self-supporting electrode is not easy to fall off due to generation of bubbles in the reaction process, so that the working stability of the catalyst is improved.

The invention belongs to the technical field of photocatalytic nanometer materials, particularly provides a low-cost photocatalyst for hydrogen production and oxygen production through pure water decomposition and a preparation method of the low-cost photocatalyst, provides an efficient photocatalytic nanometer material SrTiO3, and supports PtNix-coated CrOy as a hydrogen evolution cocatalyst and CoOOH as an oxygen evolution cocatalyst. The invention relates to a different PtNix-coated CrOy / SrTiO3 / CoOOH composite nanometer photocatalytic material with the PtNix-coated CrOy / SrTiO3 / CoOOH cocatalyst loading capacity of 0.5 wt%-5wt%. The catalyst disclosed by the invention can realize a photocatalytic reaction under ultraviolet-visible light, can realize pure water decomposition under visible light in a photocatalytic water decomposition reaction, and has excellent photocatalytic activity and relatively high photocatalytic efficiency in the photocatalytic reaction; the preparation process is simple to operate, the experimental environment is safe, the reaction condition is mild, the technical cost is low, the price of used reagents is low, expandability is achieved, and possible market demand increase in the future is met.

The invention belongs to the technical field of electrochemistry, and discloses a surface-carbonized NiFe Prussian blue composite electrode as well as preparation and application thereof. The preparation method comprises the following steps: 1) synthesizing a Prussian-blue-like catalyst on a conductive substrate in situ; 2) carrying out confinement heat treatment on the conductive substrate with the Prussian blue-like catalyst, so that the conductive substrate retains a Prussian blue-like structure and obtains a partial carbonization effect at the same time; and 3) carrying out desalting treatment on the catalyst subjected to confinement heat treatment, and then carrying out non-confinement heat treatment to obtain the Prussian blue-like composite electrode subjected to carbon etching. The method is simple and low in cost, and the prepared electrode has good electrocatalytic activity, shows good catalytic activity and stability in electrocatalytic oxygen evolution reaction, has the advantages of high hydrogen peroxide selectivity, high activity and the like in the hydrogen peroxide electrosynthesis process, and is suitable for industrial production. The method has a good application prospect in the aspect of on-site electrosynthesis of H2O2 at normal temperature and normal pressure. The catalyst can be used for electrolyzing water and electrosynthesizing H2O2.