274results about "Molybdenum oxides/hydroxides" patented technology

The invention relates to the technical field of chemical reactions, and particularly discloses a reaction device and method for preparing high-purity molybdenum trioxide, and the reaction device for preparing high-purity molybdenum trioxide comprises a reaction kettle; the filter bag is arranged in the reaction kettle; the lifting column is arranged in the discharging sleeve in a lifting and sleeving manner; the lifting driving part is arranged at the upper end of the reaction kettle and is used for driving the lifting column to do lifting motion; the spoiler is movably arranged on the lifting column and located in the bag body; the bag body shakes up and down to effectively promote mixing of reaction solutions in the vertical direction and enhance the hierarchical fluidity of the solutions, meanwhile, the spoiler pushes the reaction solution in the center to the periphery and gathers the peripheral solutions to the center to form effective radial mixing, radial flow mixing of the reaction solutions is achieved, and the reaction effect is improved. Any possible local concentration gradient can be broken, uniform distribution of reactants in the whole reaction kettle is ensured, sufficient mixing of a reaction solution is ensured, and the product purity is effectively improved.

The present invention is directed towards methods for isolating molybdenum compounds from a mixture of fission products. The mixture of fission products may be extracted from a molten salt reactor system. Utilizing a phase transfer agent, the molybdenum compounds may be extracted from an aqueous solution into an organic solution, thereby isolating the molybdenum compound from the mixture of fission products. Molybdate may then be isolated from the resulting organic solution and provided to a generator to facilitate transformation into technitum-99m.

The invention relates to the technical field of hydrometallurgy, and particularly discloses preparation methods of ultralow-potassium ammonium molybdate and ultralow-potassium derivatives thereof. The preparation method of the ultralow-potassium ammonium molybdate comprises the following steps that S1, roasted molybdenum concentrate is subjected to primary screening, smashing and re-screening, and a raw material is obtained; s2, adding the raw materials and pure water into a reaction kettle, uniformly mixing, adding an acid solution, adjusting the pH value, introducing compressed air, heating, adjusting the pressure in the kettle, cooling and depressurizing, washing, and carrying out solid-liquid separation to obtain hydrated molybdenum trioxide; s3, mixing molybdenum trioxide hydrate with an ammonia water solution, adding ammonium sulfide, mixing for 1-2 hours, carrying out solid-liquid separation, then adding an adsorbent, mixing for 1-2 hours, cooling, aging for 24-48 hours, and carrying out solid-liquid separation to obtain an ammonium molybdate solution; and S4, concentrating the ammonium molybdate solution according to the specific gravity, and then carrying out cooling crystallization, solid-liquid separation, washing and drying to obtain the ultralow-potassium ammonium molybdate. The ammonium molybdate and the derivatives thereof prepared by the invention have relatively low content of potassium.

The invention provides a preparation method of high-purity molybdenum trioxide, which belongs to the technical field of molybdenum trioxide production and comprises the following steps: S1, crushing, grinding and roasting molybdenum ore sand to obtain crude molybdenum oxide, adding the crude molybdenum oxide into a sodium hydroxide solution, heating, stirring and filtering to obtain a crude sodium molybdate solution; s2, adjusting the pH value of the crude sodium molybdate solution to 5.5-7.0, introducing the crude sodium molybdate solution into an exchange column of macroporous cation exchange resin, then adjusting the pH value of the solution to 7.0-8.5, and introducing the crude sodium molybdate solution into an exchange column filled with anion exchange resin to obtain a high-purity sodium molybdate solution; s3, excessive ammonia water is added into the high-purity sodium molybdate solution, ammonium molybdate is separated out, washing and drying are conducted, and high-purity ammonium molybdate is obtained; and S4, the high-purity ammonium molybdate is put into a rotary calcining furnace, rare earth oxide is sprayed on the inner wall of a furnace tube, and the high-purity molybdenum trioxide is prepared by adopting a calcining mode of firstly heating, then cooling and then heating. According to the invention, the purpose of producing high-purity molybdenum trioxide is realized.

To provide glass fiber yarn and a method for manufacturing the same.SOLUTION: A method for manufacturing glass fiber yarn comprises a coating step of coating a molybdenum compound on the surfaces of inorganic particles to form the surface-treated inorganic particles; a sintering step of sintering the surface-treated inorganic particles on a temperature condition of 400 to 1,000°C in a nitrogen gas atmosphere; a mixture step of mixing the surface-treated inorganic particles into a molten glass raw material; and a spinning step of spinning the molten glass raw material including the surface-treated inorganic particles to form glass fiber yarns.SELECTED DRAWING: Figure 1

The invention provides a lithium manganese iron phosphate positive electrode material and a preparation method thereof, a lithium ion battery and electric equipment, and relates to the technical field of new energy. According to the lithium manganese iron phosphate positive electrode material provided by the invention, the amorphous precursor and the high-crystallization precursor are used as raw materials, and the high-crystallization precursor causes a relatively high specific surface area of the material and affects the processability; the amorphous precursor can improve the compaction density and the specific surface area of the material, and the capacity and the cycle performance of the lithium manganese iron phosphate positive electrode material are ensured by combined use of the two precursors. The combination of elements with different valence states is used, so that the doping and coating effects are achieved at the same time, and the performance of the material is synergistically improved; elements with relatively low valence states are easily doped in a lithium manganese iron phosphate crystal structure, so that the capacity of the material is improved; and elements with relatively high valence states are distributed on the surfaces of lithium manganese iron phosphate particles, so that the stability of the surface structure of the material is improved.

The invention discloses a molybdenum oxide nanorod material, a preparation method of the molybdenum oxide nanorod material and application of the molybdenum oxide nanorod material to improvement of corn nutrient utilization, growth promotion and lodging resistance, and belongs to the technical field of corn nutrient utilization and agricultural nano material application. The morphology and dispersity of the nanorod are optimized by combining molecular composition characteristics of key enzymes (such as nitrate reductase and glutamine synthetase) in a corn nutrient utilization process, and finally the functional nanorod with targeting property and biocompatibility is obtained and can be widely applied to nutrient regulation and control scenes of corn water culture and field planting. After the material is applied, the activity of nitrate reductase and glutamine synthetase of a corn root system can be activated in a targeted manner, the nutrient utilization efficiency is accurately improved, and sufficient nutrition support is provided for plant growth. After the fertilizer is applied to plants, the root system is promoted to be developed, the stalks are thick and strong, the lodging resistance is remarkably enhanced, the protein content of the plants and grains can be increased, and the synergistic effects of efficient nutrient utilization, robust plant growth, lodging resistance and yield increase are achieved.

The invention relates to the technical field of sodium / lithium ion battery negative electrode materials, and discloses a molybdenum-based negative electrode material and a preparation method and application thereof.The molybdenum-based negative electrode material comprises a nitrogen and sulfur co-doped carbon nano short rod, and the carbon nano short rod is filled with a core-shell type molybdenum-based nano roll; the core-shell type molybdenum-based nano roll comprises a molybdenum dioxide core and a molybdenum disulfide shell layer with a bent structure, and the number of the molybdenum disulfide layers is 12-35. The molybdenum-based negative electrode material provided by the invention is composed of a carbon nano short rod coating layer and a core-shell type MoO2-MoS2 nano roll filled in the carbon nano short rod coating layer; the MoO2-MoS2 nano-roll is obtained by homologous conversion of MoO3 nano short rods and has unique core-shell structure characteristics, and the MoO2-MoS2 nano-roll and the MoO3 nano short rods form a large number of heterogeneous interfaces to provide abundant reaction active sites for storing sodium ions or lithium ions and accelerating electrochemical reaction kinetics; according to the present invention, the MoS2 shell layer has the bending structure characteristic, and the number of the MoS2 layers is controlled to 12-35 through the confinement pyrolysis temperature and the sulfur-containing initiator consumption so as to obtain the excellent sodium / lithium storage performance, and the excellent rate performance and the excellent cycle stability are provided when the MoS2 / lithium battery is used;

The invention discloses a metal oxide nano material as well as a preparation method and application thereof, and belongs to the technical field of laser preparation of metal oxides. According to the preparation method disclosed by the invention, the metal salt powder on the surface of the substrate material is treated by utilizing infrared laser, and under the action of the infrared laser, the infrared laser, the metal salt powder and the substrate material generate light-substance interaction including heat transfer and deformation, so that the metal salt powder and the substrate material are subjected to heat transfer and deformation; the metal salt powder is subjected to a chemical reaction, and a large amount of continuous nano metal oxide materials are generated on the surface of the substrate material; the metal oxide nano material obtained by the invention has the advantages of short laser processing time, high energy density, wide material application range and the like, and the product generated by laser processing has the advantages of good crystallinity, patterning and in-situ generation.

The present invention discloses a silicon-carbon negative electrode material modified with a magnetic transition metal oxide and a preparation method thereof, and belongs to the technical field of lithium-ion battery micro-nano materials. The preparation method provided by the present invention has readily available raw materials, low prices, a simple preparation process flow, easy operation, low energy consumption, and environmental friendliness in the preparation process. The prepared silicon-carbon negative electrode material has a uniform and dense modified layer containing a magnetic transition metal oxide, which can effectively improve the conductivity, high specific capacity, and cycle stability of the silicon-carbon negative electrode material. The first coulomb efficiency reaches more than 80%, and the specific capacity can be stabilized to a maximum of 1127mAh / g after 100 cycles, which is much higher than the current average level of this type of material. In addition, the prepared silicon-carbon negative electrode material has excellent mechanical flexibility and can be directly used in the assembly of lithium-ion batteries, and has strong application potential in flexible wearable electronic devices in the future.

The invention relates to the technical field of battery positive electrode materials, discloses a manganese-based battery positive electrode material precursor as well as a preparation method and application thereof, and belongs to the technical field of battery preparation. According to the technology for preparing the manganese-based battery positive electrode material precursor, a solid-phase method is mainly adopted, a high-temperature melting technology is adopted, the manganese-based positive electrode material is subjected to doping modification through multiple elements at the same time, then surface coating is carried out, the density of the synthesized positive electrode material is improved, the structural stability of the synthesized positive electrode material is enhanced, and the morphology, the crystal face and the crystal boundary of the positive electrode material are optimized; the side reaction between the crystal interface of the positive electrode material and electrolyte is inhibited, the service life is prolonged, and the safety performance during use is enhanced. A small amount of water vapor and carbon dioxide gas generated in the preparation process are discharged at high altitude, so that the environment is not polluted.

The invention provides a molybdenum-niobium-tungsten-oxygen fast-charging negative electrode material and a preparation method and application thereof.The preparation method includes the steps that a molybdenum source, a niobium source, a tungsten source and an organic solution are subjected to dehydration treatment to obtain an organic-inorganic mixed solid, and the molybdenum-niobium-tungsten-oxygen fast-charging negative electrode material and micron-sized secondary particles composed of nano-particles are prepared through a high-temperature calcination method. The conductivity and the ion diffusion rate are improved by utilizing a low-crystallinity crystal structure, the capacity retention rate is 87% after 2000 cycles at the high rate of 50C, and meanwhile, the problem of low compaction density of nanoparticles is avoided. The method is simple in process, low in energy consumption and loose in preparation condition, avoids harsh conditions, and has practical application value.

The present invention provides a method for preparing high-purity molybdenum trioxide, belongs to the technical field of molybdenum trioxide production, and comprises the following steps: step S1, molybdenum ore is crushed and ground, roasted, crude molybdenum oxide is obtained, added to sodium hydroxide solution, heated and stirred, filtered, and crude sodium molybdate solution is obtained; step S2, the crude sodium molybdate solution is adjusted to pH 5.5-7.0, an exchange column of macroporous cation exchange resin is passed, and the solution pH is adjusted to 7.0-8.5, and an exchange column equipped with anion exchange resin is passed to obtain a high-purity sodium molybdate solution; step S3, excessive ammonia water is added to the high-purity sodium molybdate solution, ammonium molybdate is precipitated, washed, and dried to obtain high-purity ammonium molybdate; step S4, high-purity ammonium molybdate is put into a rotary calcining furnace, the inner wall of the furnace tube is sprayed with rare earth oxide, and a calcination mode of first heating, then cooling, and then heating is adopted to prepare high-purity molybdenum trioxide. The present invention realizes the purpose of producing high-purity molybdenum trioxide.

A process produces high-purity vanadium chemicals from vanadium raw materials having high molybdenum contents. Molybdenum is selectively precipitated via vanadium from alkaline vanadate solutions using the following process steps: providing a molybdenum-containing alkaline vanadate solution, adding calcium hydroxide as a precipitant in portions while keeping the pH constant between 6 and 7 using acid, mixing the solution, solid-liquid separation of the resulting suspension, and further processing the low-molybdenum alkaline vanadate solution to produce a high-purity vanadium chemical having a molybdenum content of at most 500 ppm.

The invention relates to the field of materials, and discloses a three-dimensional graphene / metal oxide composite pellet and a preparation method and application field thereof, the three-dimensional graphene / metal oxide composite pellet comprises a graphene pellet and a metal oxide loaded on the graphene pellet; wherein the specific surface area of the three-dimensional graphene / metal oxide composite sphere is 50-500m < 2 > / g. In the obtained three-dimensional graphene / metal oxide composite sphere, the metal oxide is uniformly loaded on the surface of the graphene sphere, and the sphere internally has a rich pore structure, so that the application of gas sensing, catalysis, energy storage and the like is facilitated.

The invention discloses a platinum-nickel loaded molybdenum carbide / molybdenum dioxide nano composite material and a preparation method and application thereof.The platinum-nickel loaded molybdenum carbide / molybdenum dioxide nano composite material is prepared by the steps that firstly, metal molybdenum salt and a coordination agent serve as raw materials, a Mo2C / MoO2 substrate material containing heterojunctions is prepared, then PtNi is loaded on the Mo2C / MoO2 substrate material, and the platinum-nickel loaded molybdenum carbide / molybdenum dioxide nano composite material is prepared. Wherein the PtNi alloy is well anchored by the MoO2 / Mo2C nano material carrier, the catalytic stability of the material is further improved, and the reactivity of active sites can be enhanced by the electron coupling and interface synergistic effect provided by a heterogeneous interface, so that the catalytic performance of the material can be developed to the greatest extent; meanwhile, the application cost of hydrogen production under the acidic condition is further reduced. Experimental results show that the platinum-nickel loaded molybdenum carbide / molybdenum dioxide nano composite material has the advantages of high catalytic activity, excellent stability and the like when being used as a hydrogen production electrocatalyst of an acidic electrolyte, so that the platinum-nickel loaded molybdenum carbide / molybdenum dioxide nano composite material has a wide application prospect.

The invention discloses a MoO3 / C co-coated micro-expansion microcrystalline graphite / Fe3O4 lithium ion battery negative electrode material and a preparation method and application thereof, and relates to the technical field of new material preparation and new energy, and the preparation method comprises the following steps: preparing a micro-expansion microcrystalline graphite / Fe3O4 composite material by taking micro-expansion microcrystalline graphite as a matrix and adopting a sol-gel method; and preparing the MoO3 / C co-coated micro-expansion microcrystalline graphite / Fe3O4 composite material by taking the micro-expansion microcrystalline graphite / Fe3O4 composite material as a matrix and adjusting the addition amount of ammonium molybdate and citric acid by adopting a liquid phase coating method, and using the MoO3 / C co-coated micro-expansion microcrystalline graphite / Fe3O4 composite material as a lithium ion battery negative electrode material. Under the current density of 0.1 A / g, the coating material has the first specific discharge capacity of 987.3 mAh / g, the first coulombic efficiency is 81.6%, and the coating material still has the specific discharge capacity of 853.2 mAh / g after 100 cycles. The lithium storage performance such as reversible capacity of the high-purity microcrystalline graphite lithium ion battery negative electrode material is remarkably improved, and the application potential and commercial value of microcrystalline graphite are improved.

The invention provides a method for generating molybdenum dioxide or molybdenum carbide through reduction of molybdenum trioxide and application, and the method comprises the following steps: dispersing MoO3 powder in a mixed solution of monohydric alcohol and polyhydric alcohol, adding a triblock copolymer P123 stabilizer, carrying out microwave-assisted solvothermal reaction on the obtained suspension, centrifuging or filtering and washing to obtain molybdenum dioxide or molybdenum carbide; the obtained brown H0. 93MoO3 / C precursor microspheres are placed in an argon plasma environment, high-temperature calcination is carried out at the temperature of 500-600 DEG C for 30-60 min, and brown black MoO2 / C microspheres are obtained; or placing the H0. 93MoO3 / C precursor in a hydrogen-argon plasma environment, and calcining the H0. 93MoO3 / C precursor at a high temperature of 500-600 DEG C for 30-60 minutes to obtain the gray Mo2C / C microspheres. The MoO2 / C and Mo2C / C materials prepared in the invention have nanocrystalline characteristics and excellent electrochemical performance, and have good commercial application prospects as lithium battery negative electrode materials.

The invention discloses a preparation method of nearly spherical porous nano molybdenum powder. The method comprises the following steps: 1, decomposing molybdenum salt to obtain molybdenum trioxide; 2, performing hydrothermal reaction and carbonization on the organic carbon source to obtain carbon microspheres; 3, performing high-temperature carbonization to obtain partially graphitized microcrystalline carbon spheres; 4, molybdenum trioxide and microcrystalline carbon spheres are mixed in a high-dispersion mode, and a mixed material is obtained; 5, carrying out heat treatment on the mixed material to obtain nearly spherical molybdenum dioxide powder; and sixthly, hydrogen reduction is conducted, and the nearly-spherical porous nanometer molybdenum powder is obtained. Molybdenum salt is decomposed through rapid heating to avoid agglomeration of the molybdenum salt, microcrystalline carbon spheres which are good in dispersity and uniform in size are obtained through a hydrothermal method and high-temperature carbonization to serve as a nucleating agent for hydrogen reduction, the situation that subsequent agglomeration and growth of MoO2 and Mo powder are hindered in the chemical vapor transmission process in the hydrogen reduction process is avoided, and therefore the molybdenum-molybdenum-molybdenum composite material is obtained. And the chemical vapor transmission and growth process in the MoO2-Mo hydrogen reduction process is controlled in combination with gradient heating reduction, so that the dispersity of Mo particles and the size of a pore structure are ensured.

The present disclosure addresses the problem of providing a method for producing molybdenum trioxide having a lowered Sb content. A method for producing molybdenum trioxide according to the present invention includes: a step for mixing a raw material constituted of molybdenum compounds or hydrates thereof with chlorine, hydrogen chloride or a chloride; and a step for heating the obtained mixture at a temperature of 70°C or higher. Alternatively, a method for producing molybdenum trioxide according to the present invention includes: a step for mixing ammonium chloride with a raw material constituted of molybdenum trioxide, ammonium molybdate or hydrates of these; and a step for heating the obtained mixture at a temperature of 180ºC or higher.

The invention discloses a natural mineral-based wave-absorbing material synthesized based on a flash sintering process and a preparation method of the natural mineral-based wave-absorbing material, and relates to the technical field of wave-absorbing materials. Molybdenite powder and ferric oxide powder are fully and uniformly mixed in a mortar, and a mixed raw material is obtained; putting the mixed raw material into a corundum ring, connecting a platinum wire and fixing; placing the corundum ring in a muffle furnace, heating, connecting a platinum wire with a power supply, and carrying out flash burning; and naturally cooling to obtain a product, namely the MoS2 / Fe3O4 / MoO2 composite wave-absorbing material. Natural molybdenite is used as a raw material and is mixed with ferric oxide powder, a flash sintering process is adopted, and in the process, current passes through a sample to generate Joule heat, so that the temperature of the sample is rapidly increased, substance transmission is promoted, rapid reaction of the sample and the molybdenite is promoted, and rapid densification of the sample is caused, so that preparation of the MoS2 / Fe3O4 / MoO2 composite wave-absorbing material is realized. The production cost is reduced while the preparation efficiency is improved, and the environmental pollution is reduced.

This invention belongs to the field of aerogel technology, and relates to a silicon-based aerogel composite material, its preparation method, and its application. The preparation method of the silicon-based aerogel composite material is as follows: An active component precursor is added to a solvent and stirred until homogeneous, forming an active component precursor solution; ethanol and acid are added to the silicon-based precursor, stirred until homogeneous, and cooled to room temperature to form a silicon-based precursor solution; the active component precursor solution is added to form a precursor-silica sol mixed solution; an alkaline solution is added and stirred until homogeneous, forming a mixed solution; a stepped hot melt-gel treatment is performed, followed by standing to form a silicon-based composite wet gel; solvent replacement and drying yield silicon; the stepped hot melt-gel reaction includes 2-5 temperature stages, each lasting 10-80 minutes at 50-100°C. This invention employs a controllable stepped hot melt-gel process to obtain a silicon-based aerogel composite material with both high specific surface area and excellent mechanical properties.

To provide a novel graphene monoxide material that can be used in many applications such as electrochemical cells and methods of making the same.SOLUTION: Provided are a composition of graphene-based nanomaterials characterized by at least one area of one atomic layer of graphene monoxide, wherein at least a portion of oxygen molecules present in the graphene monoxide are incorporated into specific crystalline structural moieties, methods of making the same, electrodes in electrochemical devices incorporating the same, and compositions of lithium and graphene monoxide, the compositions containing material that result from cycling the electrodes.SELECTED DRAWING: Figure 1-1

The invention discloses a preparation method of a low-dimensional composite material for electrochemical sensing detection of nitrite, and relates to the technical field of low-dimensional materials. The preparation method comprises the following steps: by taking selenium powder as a reducing agent, reducing phosphomolybdic acid under specific hydrothermal reaction conditions, and after the reaction is finished, cooling, centrifuging and drying to obtain the MoO3-coated MoSe2 nano composite electrode material. The one-dimensional / two-dimensional structure MoO3atMoSe2 nano composite electrode material prepared by the invention has the advantages of strong specific recognition capability on nitrite, long service life, high sensitivity and excellent detection limit.

The application relates to the technical field of molybdenum trioxide production, and particularly discloses a preparation method of high-purity molybdenum trioxide. The method comprises the following steps: preparing a complexing impurity removing agent by taking diatomite, citric acid, ethylenediaminetetraacetic acid disodium and tartaric acid as raw materials; dissolving industrial ammonium dimolybdate to obtain an ammonium molybdate solution, adding the impurity removing agent into the ammonium molybdate solution, complexing impurities under an acidic condition, and deeply removing the impurities through flocculation and precision filtration; adjusting the alkalinity of the filtrate, and cooling and crystallizing the filtrate to obtain high-purity ammonium molybdate; and finally performing program-controlled temperature calcination in an atmosphere with a specific oxygen content by using a quartz boat coated with a composite coating on the inner wall, so as to obtain high-purity molybdenum trioxide. The application combines multi-stage purification with an accurate calcination process, can efficiently remove impurities in raw materials, and has stable process flow; the obtained molybdenum trioxide product has high purity, good crystal morphology, good process stability and good industrialization prospect.

A composite product includes molybdenum disulfide particles and palladium particles, in which an average crystallite size of molybdenum disulfide included in the molybdenum disulfide particles determined from a peak of 2θ=14.4°±0.5° obtained by X ray diffraction measurement is 150 nm or less. A catalyst ink includes the composite product and a dispersing medium. A method for producing the composite product includes a step of mixing molybdenum disulfide particles and a palladium solution, in which an average crystallite size of molybdenum disulfide included in the molybdenum disulfide particles determined from a peak of 2θ=14.4°±0.5° obtained by X ray diffraction measurement is 150 nm or less.

This invention provides an ultrafine intermediate molybdenum oxide material and its preparation method. The method involves placing ammonium molybdate in a reaction vessel and heating it in a vacuum environment at 400℃–600℃ for at least 3 hours to obtain the ultrafine intermediate molybdenum oxide material. The reaction vessel is a sealed structure except for the exhaust end, which is equipped with a one-way gas flow valve. The Fisher particle size of the ultrafine intermediate molybdenum oxide material is 0.8–1.0 micrometers. The method uses a reaction vessel equipped with a one-way gas flow valve, preventing external air from entering during the roasting process while simultaneously allowing the exhaust of gases generated during decomposition, thus ensuring the purity of the obtained molybdenum oxide material. The process conditions are simple and easy to control, making it suitable for industrial production. This material, with its small particle size and high purity, has broad application prospects.

The invention relates to preparation and application of a MoNiCoFe multi-metal self-supporting electrocatalyst in the field of hydrogen production by electrocatalytic decomposition of water. Hydrogen energy serving as renewable energy has become an important research subject in global energy transformation. Water electrolysis hydrogen production is regarded as one of the most potential hydrogen production modes by means of efficient H2 output. Therefore, development of an electrocatalyst with high efficiency, long-term stability and low cost becomes a core problem of current electrocatalysis research. The invention relates to preparation and application of a MoNiCoFe multi-metal self-supporting electrocatalyst in the field of electrocatalytic hydrogen evolution. The invention aims to solve the problems that raw materials for synthesizing a high-performance electrocatalyst in the prior art are rare in reserve and high in price. The invention designs and develops a polyacid-derived dissimilar metal oxide Mo4O11 / NiCoFe-LDH (at) IF and a preparation method of the polyacid-derived dissimilar metal oxide. According to the adopted method, (NH4) 4 [NiMo6O24H6]. 6H2O is used as a precursor, cobalt nitrate is combined as an auxiliary cobalt source, foam iron is used as a conductive substrate, the self-supporting catalyst Mo4O11 / NiCoFe-LDH (at) IF with a hierarchical porous micron column structure is constructed through a hydrothermal method, and the self-supporting catalyst shows excellent electrocatalytic activity and stability in alkaline electrolyte.

This molybdenum trioxide powder has a specific surface area, as measured using the BET method, of 100 mｍ2 / g-500 m2 / g. The molybdenum trioxide powder may have a median diameter D50 of 5-1000 nm, as determined using a dynamic light scattering method. The molybdenum trioxide powder may have a purity of 99 mass% or more. The molybdenum trioxide powder may include molybdenum trioxide having a β crystal structure.