135 results about "Metal nitrate" patented technology

The invention discloses an A-site high-entropy solid oxide fuel cell cathode material as well as a preparation method and application thereof, and provides an A-site high-entropy solid oxide fuel cell cathode material Pr < 0.2 > M < 0.2 > La < 0.2 > Ba < 0.2 > Sr < 0.2 > Co < 0.8 > Fe < 0.2 > O < 3-delta > with a perovskite phase. The preparation method comprises the following steps: S1, weighing multi-element metal nitrates, and mixing to obtain a first mixed solution; s2, dissolving ethylenediamine tetraacetic acid in ammonia water to obtain a second mixed solution; mixing the first mixed solution, the second mixed solution and citric acid to form a mixed precursor solution; s3, carrying out second heating treatment on the mixed precursor solution, and adjusting the pH value to form a gel precursor; and S4, carrying out pre-sintering treatment, third heat treatment and calcination treatment on the gel precursor to obtain a high-grade powder precursor, and carrying out ball milling and sieving treatment to obtain the A-site high-entropy solid oxide fuel cell cathode material. The cathode material is high in stability and good in chemical compatibility with a barrier layer GDC, provides high-quality mass transfer channels and active sites for O2 / O- / O2-, and has good electrochemical performance at medium and low temperatures.

The invention belongs to the technical field of high-entropy metal oxide nano powder materials, and particularly relates to a novel high-entropy metal oxide material for a negative electrode of a lithium ion battery and a preparation method of the novel high-entropy metal oxide material. On the basis of a solution combustion synthesis technology, a redox reaction system is constructed by adopting metal nitrate and organic fuel (such as citric acid, urea and the like), three spinel type high-entropy metal oxide nano powder materials with good electrochemical performance are provided and comprise (FexCoyNizCrmLin) 3O4, (FexCoyNizCrmLinZnq) 3O4 and (FexCoyNizCrmLinMgq) 3O4, the ratio of x: y: z: m: n: q is (0.1-1): (0.1-1): (0.1-1): (0.1-1): (0.1-1): (0.1-1): (0.1-1): (0.1-1): (0.1-1), and the reversible specific capacity can reach 442.2-1190.3 mAhg <-1 > after 400 cycles under the current density of 500 And the rapid synthesis process significantly shortens the time required by traditional sintering, the obtained powder product also has the characteristics of narrow particle size distribution, high grain boundary purity, excellent chemical uniformity and the like, and an effective preparation way is provided for developing a high-performance electrode material.

The invention discloses a fused salt phase change heat storage composition as well as a preparation method and application thereof, and belongs to the technical field of heat storage. The fused salt phase change heat storage composition provided by the invention comprises the following components: a fused salt material, the melting point of the fused salt material is 100-1500 DEG C, and the absorption coefficient of the fused salt material to infrared waves is 0-100m <-1 >; the infrared absorbing material comprises at least one of transition metal chlorine salt, metal carbonate, metal sulfate, metal nitrate, a carbon-based material, silicon carbide and spinel. The fused salt phase change heat storage composition provided by the invention has high heat exchange power (average heat release power) and heat storage energy density. The invention further provides a preparation method and application of the fused salt phase change heat storage composition.

The application discloses a kind of metal-loaded starch aerogel and its preparation method and application, comprising the following steps: (1) starch and water are prepared into starch milk, starch milk is heated, and gelatinized starch solution is obtained;(2) sodium laurate is added to the gelatinized starch solution and heated to react, and after the reaction is completed, starch-sodium laurate complex solution is obtained;(3) metal nitrate solution is added to the above-mentioned complex solution, and after stirring uniformly, a reducing agent is added to reduce metal ions, and metal-loaded starch hydrogel is obtained;(4) the above-mentioned hydrogel is pre-frozen and freeze-dried to obtain metal-loaded starch aerogel.The metal-loaded starch aerogel of the application has excellent ethylene adsorption capacity, with an adsorption capacity of about 32 mL / g, good adsorption stability, and the adsorption process can be carried out at normal temperature and pressure, which can be used for fruit preservation.

The invention discloses a high-entropy perovskite oxide, a preparation method thereof and application of the high-entropy perovskite oxide as an electrocatalyst, and belongs to the technical field of high-entropy transition metal oxides. A sol-gel method is adopted, various metal nitrates and lanthanum nitrate are dissolved in water and ethylene glycol in an equimolar mode, and an ammonium citrate complexing agent is added. And then heating at 120 DEG C for 10 hours. And heating the obtained gel precursor to 600 DEG C in a muffle furnace at a heating rate of 10 DEG C / min, maintaining the temperature for 2 hours, and cooling to obtain the high-entropy perovskite oxide LaBxO3. The high-entropy perovskite oxide electrocatalyst which is simple in synthesis method, stable in structure and easy in raw material obtaining is obtained, and the electrocatalyst can be applied to electrocatalytic nitrate radical reduction and sulfur ion oxidation; and a foundation is laid for developing other high-entropy transition metal oxides as electrocatalysts for synthesizing value-added chemicals by electrocatalyzing nitrate radicals and sulfur-containing wastewater.

The application discloses a kind of microspheroidal high-entropy spinel type ferrite wave-absorbing materials and preparation method thereof, belong to electromagnetic wave absorbing material technical field, the preparation method includes with the designed molar ratio six metal nitrate is weighed and dissolved in deionized water, then add ammonium fluoride, urea, after stirring, the obtained solution is hydrothermal reaction at a certain temperature for a certain time to obtain precursor, the precursor is calcined to obtain microspheroidal high-entropy spinel type ferrite.The obtained wave-absorbing material is single-phase spinel structure, micron-sized spherical morphology, its chemical formula is MFe2O4;Wherein M=Co, Ni, Cu, Zn, Cr.The microspheroidal high-entropy spinel type ferrite wave-absorbing material and preparation method thereof are used, and the performance of pure ferrite wave-absorbing material can be effectively improved, with the characteristics of simple preparation, strong absorption performance, absorption frequency bandwidth.

The application discloses a high-activity alkaline electrolytic water oxygen evolution reaction catalyst based on transition metals and a preparation method and application thereof, and belongs to the fields of new energy technologies and electrocatalytic material applications.The electrocatalyst is expressed by a chemical formula of Ni m Fe n LDH / CeO 2‑x / NF.The preparation method comprises the following steps: dissolving a nitrate precursor containing a Ce element in deionized water, then performing electrodeposition on a foam nickel which has been treated in advance, placing the foam nickel in a corresponding transition state metal nitrate solution containing Ni and Fe after high-temperature annealing treatment, and finally performing a hydrothermal reaction to obtain the electrocatalyst. m Fe n LDH / CeO 2‑x / NF.The oxygen evolution performance of the electrocatalyst is obviously superior to that of single-metal-based Ni LDH / CeO 2‑x / NF, single-layer Ni m Fe n LDH / NF and Ni m Fe n LDH / CeO2.The main reasons for improving the oxygen evolution activity of the catalyst are that the catalyst introduces low-spin Fe doping, formation of a heterojunction interface and creation of multi-oxygen vacancies.Meanwhile, the material exhibits sustained high stability, and the design of the catalyst provides technical feasibility for large-scale electrolytic water hydrogen production.

The invention discloses a method for synthesizing sustainable aviation kerosene through CO2 hydrogenation in biogas. The method comprises the following steps: taking Fe / Mn-CaO as a CO2 adsorption separating agent, taking NiMoGa ternary liquid metal as a catalyst for methane decarbonization hydrogen production, and taking a metal oxide-molecular sieve as a catalyst for synthesizing aryl aviation kerosene through CO2 hydrogenation. According to the metal oxide-molecular sieve catalyst for synthesizing the aromatic sustainable aviation kerosene through CO2 hydrogenation, a metal oxide (ABO3) with a perovskite structure is synthesized through a sol-gel method, and the metal oxide (ABO3) is physically mixed with a molecular sieve; a in ABO3 is lanthanum, and a B element comprises iron, chromium, cobalt or nickel; the molecular sieve contains ZSM-5 (Zeolite Socony Mobil-5), ZSM-11 (Zeolite Socony According to the oxide catalyst disclosed by the invention, a polydentate chelate is formed by metal nitrate and citric acid, and a special perovskite structure can be formed through simple drying and roasting, so that the oxide catalyst has excellent carburization resistance, and a formed oxygen-containing intermediate is diffused into a zeolite molecular sieve to form aromatic aviation kerosene; the preparation of aryl aviation kerosene from bio-based CO2 hydrogenation is realized.

The invention relates to a catalyst for treating nitrogen-containing VOCs and application thereof in treatment of nitrogen-containing VOCs, the main preparation steps are as follows: a carrier component containing Si, Al and optional Mg, a cross-linking agent, a rare earth oxide and water are put in a ball mill for ball milling to prepare coating slurry, the coating slurry is coated in cordierite honeycomb ceramic channels by a vacuum coating method, and the catalyst is prepared. And then the coated honeycomb ceramic is quickly dried. Preparing a metal nitrate solution as an impregnation liquid, impregnating the nitrate on the dried honeycomb ceramic, aging, quickly drying the impregnated honeycomb ceramic, and roasting the dried honeycomb ceramic for a certain time to obtain the catalyst. According to the preparation method disclosed by the invention, the catalyst for treating the nitrogenous VOCs, which is formed in a honeycomb manner, low in preparation cost, relatively high in N2 selectivity, good in catalytic oxidation effect and high in stability, can be produced, so that the problems of long technological process, short service life of the catalyst, secondary pollution of NOx and the like in the conventional process for treating the nitrogenous VOCs are solved.

The invention belongs to the related technical field of preparation of inorganic nano materials, and particularly relates to a preparation method of a bifunctional material for storage-in-situ oxidation of VOCs (volatile organic compounds), the preparation method takes ZSM-5 as a substrate material, an ion exchange method is used for modification, and the preparation method comprises the following steps: adding a pretreated commercial H-type molecular sieve into a metal nitrate solution, and stirring to obtain a mixed solution; stirring and reacting under a water bath condition, and then filtering, washing, drying and calcining to obtain the bifunctional material. The method disclosed by the invention has the advantages of simple process, low cost and the like, and the prepared bifunctional material has excellent storage-in-situ oxidation performance on toluene.

This invention discloses a process for preparing ultrafine glass powder using a spray pyrolysis method in the field of glass encapsulation materials. The process first prepares a homogeneous solution A using boric acid, aluminum nitrate nonahydrate, alkaline earth metal nitrates, lithium acetate, sodium acetate, and potassium acetate. Tetraethyl orthosilicate is dissolved in anhydrous ethanol to obtain solution B. A rare earth transition metal composite oxide nanoclusters encapsulated with a silica shell hybrid inorganic modifier is dispersed in anhydrous ethanol to obtain suspension C. Solution B and suspension C are mixed, and deionized water and hydrochloric acid are added to adjust the pH. After pre-hydrolysis and cooling, triethyl borate is added dropwise for co-condensation, and then mixed with solution A. After adjusting the pH and aging, the mixture is ultrasonically atomized and spray pyrolyzed to obtain ultrafine glass powder. The glass powder obtained by this invention has small particle size, high sphericity, and can be continuously produced.

The application discloses a preparation method of a metal oxide passivation film on a gallium nitride surface; the method comprises the following steps: mixing a metal nitrate precursor solution and a hole sacrificial agent to obtain a mixed solution; placing a substrate containing a GaN layer into the mixed solution and performing photochemical deposition under ultraviolet light to obtain a metal oxide passivation film formed on the surface of the GaN layer. The preparation method uses a metal nitrate as a precursor, and under ultraviolet light, photo-generated electrons and holes of the GaN are used to initiate a redox reaction at a solid / liquid interface to form a uniform and dense metal oxide passivation film. The method is simple in process, is performed at room temperature, does not need vacuum, has small interface damage, can be used to reduce the trap state density of the GaN surface, improve the interface stability and reliability of a device, and is suitable for surface / interface passivation treatment of power electronic and ultraviolet photoelectric devices.

The preparation method for growing the metal organic framework on the dendritic porous silicon dioxide comprises the following steps: treating the dendritic silicon dioxide by using organosilane and anhydride in sequence to obtain carboxyl-functionalized dendritic porous silicon dioxide. And growing a metal organic framework on the surface of the carboxyl functionalized dendritic porous silicon dioxide by using a metal nitrate solution. The preparation method is simple and controllable, the synthesized dendritic porous dioxide-metal organic framework composite material has large metal organic framework loading capacity, and the metal organic framework material has regular growth morphology on the surface of dendritic silicon dioxide, shows excellent corrosion resistance, and has good application prospects. Good application prospects are realized in the field of intelligent anti-corrosion coatings.

The application discloses a preparation method of a ferroferric oxide-sepiolite (Fe2O3-SEP) catalyst for CO2 amine solution desorption, wherein the catalyst is obtained by loading metal oxides on sepiolite through an impregnation method. The method comprises the following steps: firstly, magnetically stirring and impregnating a metal nitrate solution and sepiolite in a water bath, then performing suction filtration, drying, grinding and calcination to obtain the supported Fe2O3-SEP catalyst. The obtained catalyst is used for desorption of saturated amine-rich solution, the amine-lean solution after desorption is cooled, the CO2 loading amount of the amine-lean solution is titrated, CO2 is introduced again for absorption, and the amine-lean solution is recycled for 4-5 times. Compared with existing catalysts, the catalyst has the advantages of wide raw material distribution, low price, simple preparation process, no other by-products, stable catalytic performance and no influence on CO2 absorption performance of the amine solution.

The present invention relates to a metal nitrate hydrate catalyst and a method for preparing 5-hydroxymethylfurfural, using same and, more specifically, may provide: a catalyst which comprises a metal nitrate hydrate and is to prepare 5-hydroxymethylfurfural (HMF) from at least one selected from the group consisting of monosaccharides and disaccharides; and a method for preparing 5-hydroxymethylfurfural (HMF), the method comprising (a) a step of preparing 5-HMF by reaction in the presence of the catalyst from a sugar comprising at least one selected from the group consisting of monosaccharides and disaccharides. The present invention provides high 5-HMF yield and selectivity, biological and process stability, and economic efficiency by using inexpensive monosaccharides and / or disaccharides.

The invention relates to a catalytic quasi-solid ionic conductor, a preparation method and application thereof, and an aqueous zinc ion battery, and belongs to the field of aqueous zinc ion battery electrolyte preparation. The preparation method of the catalytic quasi-solid ionic conductor comprises the following steps: mixing ZSM-5 molecular sieve powder with a metal nitrate solution, carrying out a hydrothermal reaction, centrifuging, washing and drying after the reaction is completed to obtain a monatomic-loaded molecular sieve, then preparing the monatomic-loaded molecular sieve into a sheet, dropwise adding a trace amount of electrolyte for infiltration, and drying to obtain the catalytic quasi-solid ionic conductor. The catalytic quasi-solid ionic conductor is obtained. The catalytic quasi-solid ionic conductor has the following advantages: (1) rich monatomic catalytic sites can accelerate iodine conversion, reduce accumulation of polyiodide, and inhibit the shuttle effect through strong adsorption, thereby avoiding capacity fading and cathode corrosion; (2) molecular sieve pore channels can limit the activity of water molecules and inhibit side reactions; (3) zinc ions can be guided to be uniformly deposited, and dendritic crystal growth is inhibited; and (4) the cathode material has good adaptability.

The application discloses a cerium-regulated potassium-manganese composite metal oxide catalyst with a hollow nanotube structure, which is a cerium-regulated potassium-manganese composite metal oxide catalyst with a hollow nanotube structure and is composed of a composite metal potassium-manganese, potassium-manganese-cerium and oxygen. The application applies a centrifugal spinning method to the preparation of a morphology of a hollow nanotube metal oxide catalyst and catalytic combustion of carbon smoke. In the preparation method, low-cost metal nitrate and metal acetate are selected as metal precursors, polyvinylpyrrolidone is used as a template agent, and a cerium-regulated potassium-manganese composite metal oxide catalyst with a hollow nanotube structure is obtained through dissolution-centrifugal spinning-drying-calcination. The preparation method can be applied to the preparation of various composite metal oxide catalysts and has the advantages of simple preparation process, strong practicability, high efficiency, low cost and easy realization of large-scale production.

This method comprises: mixing a first solution containing a metal nitrate with a second solution containing lithium hydroxide to precipitate a metal hydroxide; thermally decomposing lithium nitrate produced from the metal nitrate and the lithium hydroxide; and recovering lithium oxide contained in the thermal decomposition product of the lithium nitrate. This method may further comprise converting lithium oxide into lithium hydroxide and reusing the lithium hydroxide.

The present application mainly relates to the technical field of pollution gas prevention and treatment, and particularly relates to a preparation method and application of a transition metal oxide catalyst for high-efficiency catalytic decomposition of N2O pollution. The preparation method is as follows: a specific surfactant is dissolved in deionized water, inorganic acid is added, stirring is performed until the mixture is miscible, transition metal nitrate is added, reaction is performed until a gel is formed, drying is performed to obtain a dry gel, calcination is performed, and the target catalyst is obtained. The prepared catalyst 10TX-Co3O4 has extremely high low-temperature catalytic activity, and the catalytic conversion rate of N2O reaches 90% at 300 DEG C; and under the condition of coexistence of O2, NO x , H2O impurity gas and N2O (simulated tail gas of a nitric acid plant), the catalyst still has high catalytic activity and stability (81% conversion rate at 400 DEG C). The present application provides a plurality of high-activity low-temperature catalysts for catalytic decomposition of N2O, and provides a wider train of thought for subsequent design of the catalyst and effective development and utilization of the additives.

The invention discloses a light-induced self-cleaning high-flux high-adhesion oil-water separation membrane and a preparation method thereof, the method comprises the following steps: S1, preparing a metal-polyphenol porous coordination polymer suspension, and drying to obtain a metal-polyphenol porous coordination polymer solid; s2, divalent metal nitrate polyhydrate, trivalent metal nitrate polyhydrate and PCP are mixed in water, alkali liquor is dropwise added to adjust the pH to be neutral, LDHs grow on the surface of a PCP solid in situ, and LDHs-PCP is obtained; s3, performing plasma treatment on the substrate filter membrane; and S4, dispersing LDHs-PCP in water, and carrying out suction filtration on the dispersion liquid onto the plasma modified substrate filter membrane to obtain the light-induced self-cleaning high-flux high-adhesion oil-water separation membrane. The oil-water separation membrane disclosed by the invention has high flux, super-hydrophilicity and underwater super-oleophobicity; the oil-water separator has high mechanical strength and illumination self-cleaning capability, and can stably operate for a long time in a high-strength oil-water separation process.

The invention discloses a carbon-supported metal catalyst for reducing N2O at low temperature with hydrogen and its application, and belongs to the field of air pollution control. The method uses H2 as a reducing agent, uses commercial activated carbon or coconut shell carbon to load metal nitrate, so that the load of metal is about 3 10wt.%;After the mixture is dissolved and dried by deionized water, it is calcined under N2 atmosphere, and then the metal active phase is reduced to a simple state under H2 atmosphere, so that it has reaction activity, and the preparation of the catalyst is completed;Then, in H2 atmosphere, the medium and low temperature (40 200 DEG C) reduction of N2O is realized. The catalyst efficiency of the present invention is high, and the activated carbon surface after the metal Ni load can reach 90% N2O removal rate under the conditions of 160 DEG C, and is low in price, effectively reducing the reduction cost of N2O, and the reaction products are all environmentally friendly (H2O and N2), without secondary pollution, and the catalyst life is longer.

The invention discloses a preparation method of a metal organic framework material composite catalyst, which comprises the following steps: S1, adding a metal nitrate solution into a UiO-66 carrier, stirring, standing and drying to obtain a UiO-66 carrier loaded with metal nitrate, the metal nitrate solution comprising one or more of a Fe (NO3) 3.9 H2O solution, a Co (NO3) 2.6 H2O solution and a Ce (NO3) 3.6 H2O solution; s2, the UiO-66 carrier loaded with the metal nitrate in the S1 is calcined in inert gas, the xYO-ZrO2 (at) C catalyst is obtained, Y is one or more of Fe, Co and Ce, and x represents the content of Fe, Co and Ce. The ZrO2 (at) C carrier inherits the skeleton stability and alkali resistance of UiO-66, and the density of active sites is increased through the strong interaction of the metal oxide and the carrier.

The invention discloses a CaLaPrNdGdFeO perovskite high-entropy ferrite wave-absorbing material as well as a preparation method and application thereof, and belongs to the technical field of electromagnetic wave absorbing materials. The chemical composition of the material is (Ca < 0.2 > La < 0.2 > Pr < 0.2 > Nd < 0.2 > Gd < 0.2 >) FeO3. The preparation method comprises the following steps: dissolving metal nitrate and a complexing agent in water, adjusting to alkalescence to obtain a metal ion-complexing agent solution, heating to obtain gel, aging, drying and carrying out self-propagating reaction to obtain precursor xerogel; and then grinding, pre-sintering and carrying out heat treatment. The ferrite wave-absorbing material composed of the equimolar high-entropy components fully solves the disadvantages of narrow effective wave-absorbing frequency band and poor low-frequency performance stability of the traditional ferrite, has the advantages of strong synthesis stability, good oxidation resistance, high absorption efficiency and stable performance, can absorb electromagnetic waves in the microwave band of 2-18 GHz, and has a wide application prospect. And the material can be used in the fields of stealth coatings, electromagnetic shielding, 5G communication devices and the like.

The application belongs to the technical field of electroluminescence, and particularly relates to a preparation method of a high-entropy oxide material and application of the high-entropy oxide material in electrochemiluminescence detection of levofloxacin. The high-entropy oxide material is a kind of five-element high-entropy oxide HEO-800 material with simple raw materials, convenient synthesis, excellent electrochemiluminescence performance, which is synthesized by taking metal nitrate of Fe, Co, Cu, Zn and Ni as raw materials, and taking Na2CO3 and NaOH as raw materials. The HEO-800 material has excellent conductivity and chemical stability, and a multi-electron reaction potential accelerates the conversion of dissolved oxygen into reactive oxygen species (ROS), enhances the electroluminescence intensity, and based on the quenching effect of LVX, a method for detecting LVX by using a luminol / HEO-800 system is established. By fitting the change of ECL intensity with the concentration of LVX, a linear calibration curve is obtained, the correlation coefficient is 0.993, and the detection limit is 1.02*10 ‑5 μM (S / N=3). The material has good sensitivity, stability and reproducibility for electrochemiluminescence detection of LVX, and provides a new scheme for designing a new electrocatalyst for testing LVX.

An embodiment of the present disclosure provides an interlayer produced from an electrolyte additive carrying with a large amount of metal nitrates by subjecting a polymer solution, wherein metal nitrates are dissolved, to an electrospinning method, and also further includes the interlayer in a lithium metal battery using a carbonate electrolyte to thereby provide a lithium metal battery having significantly superior electrochemical performance and stability compared to lithium metal batteries using conventional commercially available carbonate electrolytes.

The application belongs to the field of catalysis technology, and discloses a carbon sponge supported nanometer array monolithic catalyst, a preparation method and application thereof, and comprises the following steps: (1) preparing nitrogen-doped carbon sponge; (2) preparing a precursor solution: dissolving metal salt in water, then adding a precipitant to prepare the precursor solution; the metal salt is manganese acetate and metal nitrate, and the metal nitrate is rare earth metal nitrate and / or transition metal nitrate; (3) adding a template agent to the precursor solution, stirring until completely dissolved, adding nitrogen-doped carbon sponge, then performing hydrothermal reaction, cooling, washing, and drying to obtain the carbon sponge supported nanometer array monolithic catalyst. The preparation method is green and efficient, the denitration efficiency of the prepared catalyst can reach 100%, the catalyst has high sulfur and water resistance, and the waste catalyst is easy to handle.

A preparation method of a medium-entropy perovskite oxygen carrier comprising: 1) preparing an aqueous solution from metallic nitrate serving as a raw material, performing a coprecipitation reaction w

The application provides a method for determining the content of aluminum by graphite furnace atomic absorption spectrometry. The method comprises the following steps: preparing an aluminum series calibration solution added with an alkali metal nitrate, determining the absorbance of the solution by using a graphite furnace atomic absorption spectrometer, and then drawing a standard curve with the determined absorbance as the ordinate and the content of aluminum in the aluminum series calibration solution added with the alkali metal nitrate as the abscissa; adding the alkali metal nitrate into a sample to be determined, determining the absorbance of the sample by using the graphite furnace atomic absorption spectrometer, and then calculating the content of aluminum in the sample to be determined according to the standard curve. The method can fully atomize the aluminum element, improve the measurement accuracy, and solve the problem of different atomization rates of sample water and calibration solution, and mask the interference of other metal oxides.

The invention discloses multivalent high-entropy sulfide, a preparation method thereof and application of the multivalent high-entropy sulfide as an electrocatalyst, and belongs to the technical field of high-entropy transition metal sulfide. The preparation method comprises the following steps: dissolving a plurality of metal nitrates in isopropanol and glycerol according to the concentration of equal molar ratio by adopting a solvothermal method, carrying out solvothermal reaction, filtering and washing to obtain a metal glycerol precursor; the method comprises the following steps: dissolving a metal glycerol precursor and thioacetamide in ethanol, carrying out solvothermal reaction, cooling, centrifuging, washing and drying to obtain the multivalent high-entropy sulfide. The multivalent high-entropy sulfide which is simple in synthesis method, stable in structure and easy in raw material obtaining is obtained and can serve as an electrocatalyst to be applied to electrocatalytic nitrate reduction synthesis of ammonia, and a foundation is laid for developing other high-entropy transition metal sulfide serving as an electrocatalyst for electrocatalytic nitrate wastewater synthesis of value-added chemicals.

The invention discloses a metal-doped cerium oxide nano-scale self-supporting electrode material (MCeO and NF, M is a divalent transition metal) in the field of oxidation of an electrocatalytic anode 5-hydroxymethylfurfural (HMF), and an efficient, low-cost and stable transition metal catalyst is developed through strategies of constructing a heterostructure on a conductive substrate, doping cations and the like. According to the preparation method, a transition metal cerium hydroxide precursor is deposited on a foamed nickel substrate through a hydrothermal method, and then high-temperature calcination is performed to obtain the metal cerium oxide nanoscale catalyst with different morphologies. The method is characterized in that different precursors can be prepared by regulating and adding different metal nitrates, and then different metal-doped nanoscale catalysts are prepared. After the CoCeO-coated NF nano-catalyst prepared by adding cobalt nitrate and mixing the cobalt nitrate with a certain amount of cerium nitrate and urea is electrolyzed for 2 hours under the condition of 50 mA constant current, the conversion rate of HMF is 100.0%, and the selectivity of 2, 5-furandicarboxylic acid (FDCA) is 99.0%. When the nano-scale catalyst material prepared by the method is applied to electro-catalytic anode HMF oxidation, relatively high HMF conversion rate and Faraday efficiency are realized, guidance is provided for future industrial application, and the nano-scale catalyst material can be widely applied to the field of electro-catalytic anode HMF oxidation.