56 results about "Trioxide" patented technology

The invention discloses an anti-pollution flashover and anti-impact tempered glass insulator and a processing technology thereof.The processing technology comprises the steps that silicon dioxide, sodium carbonate, calcium oxide, magnesium oxide, cerium dioxide, niobium trioxide, scandium trioxide, tungsten carbide and nano boron nitride are evenly mixed according to the formula ratio and fused, and fused liquid is obtained; then slowly injecting the molten liquid into a mold preheated in advance in a nitrogen environment, molding, and demolding to obtain a blank; carrying out primary nitriding treatment, pulsed magnetic field treatment, toughening treatment, heat treatment and secondary nitriding treatment to obtain a toughened glass part; and finally, binding the iron cap, the toughened glass piece and the steel foot into a whole by using an adhesive to obtain the toughened glass insulator. The toughened glass insulator has excellent anti-pollution flashover and anti-impact performance.

The invention provides spherical cobaltosic oxide as well as a preparation method and application thereof, the preparation method comprises the following steps: (1) injecting a cobalt salt-containing solution and a carbonate solution into a base solution in a parallel flow manner for a coprecipitation reaction to obtain a mixed-phase precursor; and (2) calcining the mixed phase precursor to obtain the spherical cobaltosic oxide, wherein the solute of the base solution in the step (1) is alkali metal hydroxide. According to the method disclosed by the invention, the precursor of the hydroxyl cobalt oxide and cobalt carbonate mixed phase can be prepared without separating kettles, the content of foreign ions in the precursor is low, and small-particle and high-purity cobaltosic oxide can be prepared by directly sintering.

The invention discloses a thermite formula for coating a ceramic layer in a steel pipe and a preparation method of the thermite formula, and relates to the technical field of steel pipe lining metal ceramic, the formula comprises aluminum powder, ferric oxide, silicon dioxide and oxygen, and further comprises copper oxide and diboron trioxide, the content of oxygen is smaller than the amount of oxygen consumed when the aluminum powder is completely oxidized, and the content of silicon dioxide is smaller than the amount of copper oxide consumed when the aluminum powder is completely oxidized. When the oxygen participating in the reaction is exhausted, aluminum which does not participate in the oxidation reaction exists. According to the invention, by adding the diboron trioxide and the copper oxide, a traditional metal ceramic lining steel pipe combined in a mechanical mode can be improved into a metal ceramic inner covering steel pipe combined in a brazing mode, so that the binding force of the inner covering layer and the base pipe is improved, and the surface flatness of the inner covering layer is improved so as to reduce the fluid conveying resistance; the metal ceramic internally-coated steel pipe manufactured through the formula and the specific implementation method has the advantages of being high in bonding force between the internally-coated layer and the base pipe, smooth in surface, resistant to high temperature and high pressure and resistant to corrosion.

The present invention relates to a high-entropy rare earth chromate high-temperature negative temperature coefficient thermistor material, belonging to the field of semiconductor sensors, and aims to solve the existing perovskite structure high-temperature NTC material. Under high temperature environment, the Cr element in the system will volatilize in the form of gaseous CrO3, showing poor high-temperature aging stability. The high-temperature negative temperature coefficient thermistor material uses lanthanum trioxide, neodymium trioxide, samarium trioxide, europium trioxide, gadolinium trioxide and chromium trioxide as raw materials, and undergoes wet three-dimensional vibration ball milling, powder calcination, cold isostatic pressing, and high-temperature sintering to obtain a perovskite structure (La 0.2 Nd 0.2 Sm 0.2 Eu 0.2 G 0.2 )CrO3 thermosensitive material. The electrical performance parameters of this series of materials are: B 0℃ / 1300℃ =2044±1.42%K,ρ 1300℃ =1.45×10 3 ±1.73%Ω·cm. The high-entropy rare earth chromate high-temperature negative temperature coefficient thermistor (La 0.2 Nd 0.2 Sm 0.2 Eu 0.2 G 0.2 )CrO3 has excellent negative temperature coefficient characteristics in the temperature range of 0~1300℃, and shows good high temperature aging stability at high temperatures (the resistance drift rate is only 4.35% after aging for 500 hours at 1300℃).

The invention discloses a series of high-stability negative temperature coefficient heat-sensitive materials based on seven-principal-element high-entropy rare earth stannate and application, and aims to solve the problem that existing stannate heat-sensitive materials with pyrochlore structures cannot meet long-term application in high-temperature environments. The series of heat-sensitive materials are prepared by mixing lanthanum trioxide, neodymium oxide, samarium oxide, europium oxide, gadolinium oxide, dysprosium oxide and tin dioxide with erbium oxide or ytterbium oxide respectively, and the preparation process comprises the steps of wet three-dimensional vibration ball milling, powder calcination, cold isostatic pressing, high-temperature sintering and the like. And finally obtaining the negative temperature coefficient heat-sensitive material with the pyrochlore structure. The electrical property parameters of the series of materials are as follows: B is equal to 13914-14067 + / -1.89% K, and rho 1500 DEG C is equal to 180.26-204.09 + / -1.38% omega.cm. The negative temperature coefficient heat-sensitive material has the negative temperature coefficient characteristic in the wide temperature range of 400-1500 DEG C and shows excellent high-temperature aging stability under the high-temperature condition of 1500 DEG C, and the resistance drift rate of the negative temperature coefficient heat-sensitive material is only 0.7% after an aging test for 500 hours.

The invention discloses a rare earth element modified nickel-based nano-catalyst and a preparation method and application thereof.The rare earth element modified nickel-based nano-catalyst comprises a carrier and an active component loaded on the carrier, and the carrier is cerium dioxide and yttrium oxide co-doped three-dimensional ordered silicon dioxide nanoparticles; the active component is metal nickel. The application refers to the application of the catalyst in preparation of synthesis gas through carbon dioxide methane reforming. According to the invention, rare earth element doped and modified three-dimensional ordered silicon dioxide nanoparticles are used as a carrier, nickel metal is loaded on the nanoparticles, and the problem of carbon deposition can be effectively reduced by adjusting the interaction of alkaline sites and oxygen vacancies on the surface of the catalyst and the metal carrier. The method provided by the invention is helpful for realizing industrialization of a carbon dioxide methane catalytic reforming reaction, realizing a carbon emission reduction target and solving a green electricity energy storage problem.

The invention relates to a method for plasma-assisted sintering of calcium stannate short-wave infrared long afterglow powder, the chemical composition of the long afterglow powder is Ca2SnO4: xEr < 3 + > / Pr < 3 + > / Nd < 3 + >, and x is more than or equal to 0.1 and less than or equal to 1; the long afterglow powder takes calcium stannate as a matrix and is formed by doping and sintering rare earth capable of emitting red light. The sintering adopts a stir-frying plasma assisted low-temperature sintering method, compounds containing an erbium element, a praseodymium element and a neodymium element are doped, namely erbium trioxide, praseodymium trioxide and neodymium oxide, and H3BO3 is added as a fluxing agent to prepare a sample. The method is low in energy consumption, and the yield of the calcium stannate fluorescent powder is effectively improved; according to the invention, short-wave infrared long-afterglow luminescence of doped ions is realized, and the emission wavelength is adjustable from 800nm to 1600nm.

The invention discloses a space anti-radiation glass cover sheet and a preparation method thereof, the glass cover sheet comprises the following raw materials by mass: 50-70 parts of silica, 5-15 parts of sodium oxide, 5-10 parts of lithium oxide, 5-10 parts of diboron trioxide, 3-10 parts of lead oxide, 2-6 parts of cerium oxide, 0.5-6 parts of potassium oxide, and 2-5 parts of alumina. According to the invention, PbO and CeO2 are added into the preparation raw materials, so that the radiation resistance of the glass cover plate is enhanced.

The invention relates to the technical field of alloys, in particular to a rare earth-doped high-temperature-resistant chemical-resistant alloy material and a preparation method thereof. The material comprises the following components in parts by weight: 2.34 to 4.39 parts of cerium, 1.48 to 1.96 parts of dicerium trioxide, 4.34 to 7.28 parts of europium, 2.24 to 3.54 parts of europium oxide, 1.84 to 2.68 parts of yttrium, 0.58 to 1.03 parts of yttrium oxide, 4.85 to 6.96 parts of titanium, 2.58 to 3.67 parts of titanium dioxide, 5.21 to 8.56 parts of hafnium, 2.56 to 4.32 parts of hafnium dioxide, 10.24 to 20.34 parts of nitrogen-doped tungsten carbide and the balance of nickel. The alloy material provided by the invention has excellent high temperature resistance and chemical resistance.

Disclosed in the present invention are a wear-resistant high-strength lightening admixture for a drilling fluid, and a preparation method therefor. The lightening admixture comprises the following components in percentages by mass (on the basis of all the components totaling 100%): 65-75% of silicon dioxide, 5-10% of aluminum oxide, 5-10% of diboron trioxide, 5-10% of an alkaline earth metal oxide, 5-10% of an alkali metal oxide, 0.2-3% of a rare-earth element, 0-2% of ferric oxide, 0-2% of manganese dioxide, 0-2% of zirconium oxide, 0-2% of zinc oxide, and 0.2-5% of other trace element materials. The preparation method comprises: crushing, grinding and granulating all the components to prepare precursor particles; and pre-treating the precursor particles, then subjecting same to high-temperature hollow-sphere formation, and then performing a surface treatment to prepare a wear-resistant high-strength lightening admixture for a drilling fluid. The product has the advantages of being environmentally friendly an obvious density reducing effect, lubricating and resistance-reducing functions, no loss of MWD signals, etc.; moreover, the problems of low compressive strength, proneness to breakage, poor wear resistance, etc., of existing low-density hollow glass bead lightening admixtures are solved.

The application relates to the technical field of welding materials, and discloses a 600MPa-grade high-toughness ultra-low-hydrogen welding rod, which comprises a welding core and a coating arranged on the surface of the welding core, and the coating raw material comprises the following components in parts by weight: 22-32 parts of marble, 16-24 parts of feldspar, 8-12 parts of fluorite, 10-15 parts of titanium white, 4-8 parts of medium-carbon manganese iron, 1.2-3.0 parts of low-carbon silicon iron and 6-12 parts of titanium trioxide. Through the technical scheme, the problems of high weld crack rate and high diffusible hydrogen content in the related art are solved.

The invention relates to a method for promoting alkali leaching and vanadium extraction by using mechanical activation of iron trioxide-containing tailings, which comprises the following steps: (1) mixing iron trioxide-containing tailings and vanadium slag, and carrying out ball milling for mechanical activation to obtain activated slurry; and (2) alkali and the activated slurry obtained in the step (1) are mixed, oxygen-containing gas is introduced for an alkaline leaching reaction, and vanadium-containing leachate is obtained. According to the method, mechanical activation of the tailings is utilized, the structure of a vanadium-containing ore phase in the vanadium slag is destroyed through the method of combining physical and chemical means, oxidation dissolution of vanadium is promoted, then efficient oxidation leaching of vanadium in the vanadium slag under the low-temperature and low-alkali conditions is achieved, the conditions are mild, the vanadium extraction rate is high, and industrial large-scale production is easy to achieve.

A method for coating a substrate with a Co-Pi modified BiVO4 / WO3 heterostructure film includes direct current reactive sputtering tungsten (W) onto a substrate in a gaseous mixture containing oxygen to form a tungsten trioxide (WO3) film, direct current reactive sputtering bismuth (Bi) onto the tungsten trioxide (WO3) film in a gaseous mixture containing oxygen to form a dibismuth trioxide (Bi2O3) film, drop-casting a vanadyl acetylacetonate solution onto the Bi2O3 film and heating at a temperature of at least 450° C. in ambient air to convert the Bi2O3 film to a BiVO4 film, and photoelectrochemically coating the BiVO4 film with a cobalt-phosphate (Co-Pi) to form a modified film on the surface of the substrate. A photoanode containing the Co-Pi modified BiVO4 / WO3 heterostructure film prepared by the method, and its application in water splitting.

The application discloses a network soil thermal desorption catalyst, a preparation method and application thereof, and belongs to the field of environmental protection. The catalyst takes an iron net as a carrier and takes manganese-cobalt composite metal sulfide as an active component. The mass content of the active component is 3-6% based on the mass of the carrier. The scheme is characterized in that the iron net is subjected to oxidation pretreatment, so that an iron trioxide oxidation layer is formed on the surface; then the iron net is immersed in an active component solution to perform electrochemical deposition loading; finally, the finished catalyst is formed through special atmosphere calcination. The catalyst is environment-friendly, can efficiently induce the thermal desorption of organic pollutants in soil, and can realize 100% removal of o-xylene at 120 DEG C. Meanwhile, the catalyst is convenient to recycle, has higher economic benefits and wide market application prospect.

The invention discloses a CaCeNbWO8-based high-entropy negative temperature coefficient thermal sensitive ceramic material and a preparation method thereof, belongs to the field of negative temperature coefficient thermistors, and aims to expand the temperature zone range of a scheelite structure negative temperature coefficient thermal sensitive ceramic material. The material is prepared by mixing and firing raw materials including calcium carbonate, cerium dioxide, tungsten oxide, niobium pentoxide, samarium oxide, europium oxide, lanthanum trioxide, holmium oxide or dysprosium oxide according to a stoichiometric ratio, the chemical formula is (Ca1 / 3Ce1 / 3M1 / 3) (Nb1 / 2W1 / 2) O4, and M is Sm, Eu, La, Ho or Dy; the electrical property parameters of the thermal sensitive ceramic material with the negative temperature coefficient are as follows: B200 DEG C / 1100 DEG C is equal to 6081-7210 + / -1.8% K, rho1100 DEG C is equal to 2.87 * 10 < 3 >-4.09 * 10 < 3 > + / -1.37% omega.cm, and the applicable temperature range is 200-1100 DEG C. The material has a wide temperature range of 200-1100 DEG C, can maintain high sensitivity at a high temperature due to a large material constant B value, and shows excellent aging stability at 1000 DEG C. Through measurement, the resistance drift rate of the thermal sensitive ceramic material with the negative temperature coefficient is less than 3.49 + / -0.03% after the thermal sensitive ceramic material is aged at 1000 DEG C for 500 hours.

The invention belongs to the technical field of functional material preparation, and provides GYbZ powder for PS-PVD spraying and a preparation method of the GYbZ powder. The preparation method comprises the following steps: mixing powder preparation raw materials with water, and carrying out ball milling to obtain slurry; sequentially carrying out spray granulation and drying on the slurry to obtain a granular material; and sintering and spheroidizing the granular material by adopting plasma flame, and crushing the obtained spheroidized powder to obtain the GYbZ powder, raw materials for preparing the powder comprise the following components in percentage by mass: 38-42% of zirconium dioxide, 5-8% of ytterbium trioxide, less than or equal to 1.0% of hafnium oxide and the balance of gadolinium trioxide. According to the method, the granular material is sintered and spheroidized by adopting plasma flame, so that pores in the final GYbZ powder are relatively few. Data of the embodiment shows that the porosity of the obtained GYbZ powder is 15-19%.

In order to solve the technical problems that iron hafnate prepared by the existing iron hafnate preparation method is uneven in ground and cannot meet the technical index requirements of aero-engine hot end components and the like on high-temperature ceramic additives, the invention provides a preparation method of iron hafnate. The preparation method comprises the following steps: firstly, dissolving hafnium oxide in hydrofluoric acid, then adding iron trioxide into the hydrofluoric acid, carrying out evaporation drying treatment to obtain an iron hafnium fluoride block material, and crushing and sieving the iron hafnium fluoride block material to obtain iron hafnium fluoride powder; then preparing the iron hafnate fluoride powder into a mud blank, heating and raising the temperature to carry out defluorination hydrolysis reaction, and repeating the process until fluorine ions meet requirements to obtain an iron hafnate amorphous substance; and finally, carrying out high-temperature qualitative treatment on the amorphous iron hafnate substance to obtain a porcelain-like iron hafnate finished product. According to the method, the texture uniformity of the iron hafnate can be ensured through liquid-phase mixing and drying by distillation, multiple times of mixing treatment with mud and defluorination hydrolysis reaction.

The invention discloses a method for preparing a fluoride ion adsorbent: (1) ferric oxide, ferric disulfide and calcium chloride are uniformly mixed to obtain a mixture; wherein the mass ratio of ferric oxide, ferric disulfide and calcium chloride is (10-12): (1-2): (0.08-0.1); (2) the mixture is subjected to one-stage roasting in an atmosphere containing tin tetrafluoride gas to obtain a one-stage roasting slag; (3) the one-stage roasting slag is subjected to two-stage roasting in a water vapor atmosphere to obtain a two-stage roasting slag; (4) the two-stage roasting slag is water-soaked, filtered after the water-soaking is completed, and the fluoride ion adsorbent is obtained. The present invention selects ferric oxide, ferric disulfide and calcium chloride as raw materials, and combines the process control of two-stage roasting, and the adsorbent obtained by water-soaking finally has the characteristics of stable structure, large fluorine adsorption capacity, fast fluorine adsorption rate, etc., and the adsorbent can be separated from the solution without liquid-solid separation.

The application relates to a wide-temperature-range negative temperature coefficient thermosensitive ceramic material and a preparation method thereof. The thermosensitive ceramic material comprises, in percentage by weight, 58.17-71.47% of lanthanum trioxide, 20.53-23.01% of aluminum trioxide, 3.98-15.36% of cerium dioxide and 1.54-5.94% of niobium pentoxide, and the chemical composition is La 1‑ x Ce x Al 1‑y Nb y O3, wherein x=0.05-0.20 and y=0.025-0.10. The NTC thermistor has the advantages of an ultra-wide temperature range (25 DEG C-1500 DEG C), good consistency of resistance value and B value, a resistance drift rate of less than 0.375% after aging for 500 hours at high temperature, high stability, long service life and the like.

The invention discloses low-melting-point sealing glass powder. The low-melting-point sealing glass powder is prepared from the following raw material components in percentage by mass: 50-70% of bismuth oxide; 1-5% of zinc oxide; 10 to 30 percent of zinc borate; 5%-10% of spodumene; and 2-5% of quartz. The low-melting-point sealing glass powder disclosed by the invention adopts 10-60% of zinc borate as a raw material, so that the content of active diboron trioxide in the glass powder can be reduced, and a sealing piece is high in strength and good in reliability.

The invention discloses a method for simultaneously determining the contents of diboron trioxide and phosphorus pentoxide in boron phosphate, and belongs to the technical field of analytical testing. According to the method, the sample is digested through microwaves, the diboron trioxide and the phosphorus pentoxide can be measured at the same time through the inductively coupled plasma emission spectrometry, the method is easy to operate, efficient, small in reagent dosage and environmentally friendly, but the content of the diboron trioxide and the content of the phosphorus pentoxide can be accurately measured; therefore, the method for measuring the contents of the diboron trioxide and the phosphorus pentoxide in the boron phosphate by utilizing the microwave digestion-inductively coupled plasma emission spectrometry has very important significance.

The invention discloses a high-entropy rare earth chromate negative temperature coefficient thermal sensitive ceramic material as well as a preparation method and application thereof, belongs to the field of high-temperature thermal sensitive sensors, and aims to solve the stability problem of chromium-based perovskite in high-temperature long-term use, especially the problem of electrical property reduction caused by Cr element volatilization. The thermal sensitive ceramic material with the negative temperature coefficient is prepared by the following steps: respectively mixing raw materials including lanthanum trioxide, neodymium oxide, samarium trioxide, europium oxide, gadolinium oxide and chromium sesquioxide with dysprosium oxide, holmium oxide, yttrium oxide and erbium oxide according to a stoichiometric ratio; and carrying out wet ball milling, drying, powder calcination, cold isostatic compaction and high-temperature sintering to obtain the perovskite structure (La1 / 6Nd1 / 6Sm1 / 6Eu1 / 6Gd1 / 6M1 / 6) CrO3 thermal sensitive ceramic material, and M is Dy, Ho, Y or Er. The electrical property parameters are as follows: B 25 DEG C / 1500 DEG C is equal to 1927-2011 K, rho 1500 DEG C is equal to 1.29 * 10 < 2 >-1.60 * 10 < 2 > omega.cm, and good high-temperature aging stability is shown at high temperature (the resistance drift rate after aging for 500 hours at 1500 DEG C is less than 4.6%).

The invention discloses an optical coating material with high light transmittance and a preparation method thereof, and relates to the field of optical coating. The invention discloses an optical coating material with high light transmission performance. The optical coating material comprises the following raw materials in parts by weight: 50-60 parts of aluminum powder; 20 to 28 parts of titanium dioxide; 4 to 10 parts of lanthanum trioxide; 2-6 parts of rare earth fluoride; the optical coating material is prepared through the steps of raw material mixing, high-temperature sintering, vacuum melting and cooling crystallization. The invention provides an optical coating material with high light transmission performance and long-term stability.

A glass includes a composition characterized by the following constituent phases (in mol-%): 20-80 lanthanum titanate; 10-50 lanthanum niobate; 0-60 lanthanum molybdenum borate; 2-40 lanthanum borate; 2-40 yttrium borate; 0-40 gadolinium borate; 2-40 zirconium silicate; 2-40 diboron trioxide; and 0-20 silicon dioxide. A refractive index is at least 2.00.

The invention relates to the technical field of welding materials, and provides a 600MPa-grade high-toughness ultralow-hydrogen welding rod which comprises a core wire and a coating arranged on the surface of the core wire, and the coating is prepared from, by weight, 22-32 parts of marble, 16-24 parts of feldspar, 8-12 parts of fluorite, 10-15 parts of titanium dioxide, 4-8 parts of medium-carbon ferromanganese, 1.2-3.0 parts of low-carbon ferrosilicon and 6-12 parts of titanium sesquioxide. According to the technical scheme, the problems of high weld crack rate and high diffusible hydrogen content in the prior art are solved.

The invention belongs to the technical field of resistor electrical elements, and particularly relates to a preparation method of a zinc oxide resistor with high gradient, large through-flow and stable impact. The zinc oxide resistor comprises zinc oxide, bismuth trioxide, antimony trioxide, nickel sesquioxide, manganous-manganic oxide, cobaltosic oxide, tin dioxide, diboron trioxide, nano silver powder, aluminum nitrate nonahydrate, barium acetate, a binder, a dispersing agent and deionized water. The zinc oxide varistor designed by the invention has the advantage of good stability under high gradient and large flux, overcomes the degeneration behavior of the zinc oxide varistor caused by the influence of the existing large-current surge impact on the zinc oxide crystal boundary potential barrier, and is suitable for industrial popularization.

The present invention discloses an Fe3O4-CNT water-based magnetic fluid, a preparation method thereof, and a magnetically controlled medium-temperature heat collection system. The preparation method includes: S1, acidifying carbon nanotubes; S2, modifying the acidified carbon nanotubes with iron tetroxide to obtain magnetic carbon nanotubes; S3, performing micro-aggregation of the magnetic carbon nanotubes based on a porous alumina template to form and collect a magnetic carbon nanotube array; S4, preparing a water-based magnetic fluid based on the magnetic carbon nanotube array. The iron tetroxide composite carbon nanotubes prepared by the present invention based on a porous alumina template are used as nanofluids in a heat collection medium, and an ideal nanodot array with artificially adjustable length is prepared, which can not only achieve a high light absorption rate, but also perform micro-regulated aggregation under the action of a magnetic field, further enhancing the photothermal conversion efficiency.

The invention is suitable for the technical field of chemical power sources, and provides a preparation method of a porous ferroferric oxide symmetric capacitor, which comprises the following steps: putting an iron source salt solution, a pore-forming additive and a carbon material substrate subjected to surface treatment into a reaction kettle, putting the reaction kettle into a drying oven, carrying out hydrothermal reaction, and after the hydrothermal reaction is finished, obtaining a porous ferroferric oxide symmetric capacitor; the porous iron trioxide carbon material is obtained; performing electrochemical conversion on the porous ferric oxide-carbon material by adopting a cyclic voltammetry method to obtain a flexible porous ferroferric oxide-carbon material; and taking the porous ferroferric oxide and carbon material as a positive electrode material and a negative electrode material respectively, taking two electrode clamps to clamp the positive electrode material and the negative electrode material respectively, placing the positive electrode material and the negative electrode material in an electrolytic tank containing a neutral salt solution, and assembling to obtain a supercapacitor monomer. The invention also provides a symmetric capacitor of porous ferroferric oxide and an application thereof. The capacitor has the advantages of high specific capacitance, high energy density, good cycling stability, long service life and the like.

A high-purity gallium sesquioxide which contains gallium sesquioxide and one or more impurity elements that are elements other than gallium and oxygen, the total concentration of the impurity elements being 1 ppm by mass or less in glow discharge mass spectrometry, and the concentration of silicon as one of the impurity elements being 0.01 ppm by mass or more and 0.1 ppm by mass or less.

The invention belongs to the technical field of urea electrode materials produced through coupling of new energy electroreduction CO2 and NO3 <->, and discloses a copper-doped cobaltosic oxide electrode material and a preparation method and application thereof.The method comprises the steps that S1, foamy copper is sequentially soaked in hydrochloric acid, acetone, ethyl alcohol and water to be pretreated, and foamy copper without impurities on the surface is obtained; s2, dispersing a cobalt source and an organic ligand in a solvent, and stirring to obtain a mixed solution; s3, enabling the pretreated foamy copper and the mixed solution to react in a high-pressure reaction kettle, cooling to room temperature, cleaning with deionized water, and performing vacuum drying to obtain a copper-doped cobaltosic oxide electrode material; the application comprises application of the electrode material in preparation of urea through electrochemical co-reduction of CO2 and NO3 <->.