640 results about "Manganese salt" patented technology

The invention discloses an electrolyte for an aqueous manganese-based battery. The electrolyte comprises an electrolyte, and the electrolyte comprises a manganese salt; the weak acid is used for regulating and controlling proton dynamic release of the positive electrode / electrolyte interface to realize on-demand supply of protons of the positive electrode / electrolyte interface; and a solvent, wherein the solvent is deionized water; the PH range of the electrolyte is 2.0-3.5, and the electrolyte can realize on-demand supply of protons of a positive electrode / electrolyte interface in the charging and discharging process of the aqueous manganese-based battery, and promotes efficient and reversible deposition and dissolution reaction of a positive active substance manganese dioxide. According to the invention, the proton on-demand supply electrolyte is constructed by utilizing dynamic dissociation equilibrium of weak acid, so that on-demand supply of protons in the MnO2 dissolving process is realized, complete electrochemical dissolution of MnO2 is promoted, and generation of'dead manganese 'is inhibited, so that the cycling stability of the battery and the utilization efficiency of active substances are remarkably improved. The invention also discloses an aqueous manganese-based battery for realizing on-demand supply of protons and application of the aqueous manganese-based battery in the field of secondary energy storage.

The invention discloses a manganese hydrogen phosphate precursor, lithium iron manganese phosphate, a preparation method of the manganese hydrogen phosphate precursor, a positive pole piece containing the lithium iron manganese phosphate, a battery containing the lithium iron manganese phosphate, and an electric device containing the lithium iron manganese phosphate. The preparation method comprises the following steps: firstly, carrying out primary precipitation reaction on soluble manganese salt and a precipitator to prepare manganese hydroxide, and then carrying out secondary precipitation reaction on the manganese hydroxide and phosphoric acid to prepare the manganese hydrogen phosphate precursor. The manganese hydrogen phosphate precursor with low impurity ion content and high yield is prepared through secondary precipitation reaction.

The invention relates to the technical field of preparation of manganous-manganic oxide, in particular to a production and preparation process of a manganous-manganic oxide material for batteries, which comprises the following steps: dissolving high-purity manganese sulfate to prepare a manganese sulfate solution, and adding a dispersing agent and a surfactant to obtain a manganese salt solution; the method comprises the following steps: adding a base solution into a reaction kettle, stirring and heating, conveying a manganese salt solution and ammonia water, synchronously introducing oxygen, dividing the whole oxidation reaction process into two stages, controlling the flow velocity of the ammonia water in different stages, and dynamically adjusting the temperature; and carrying out suspension precipitation on manganous-manganic oxide obtained by the oxidation reaction, aging, and carrying out dehydration suction filtration, washing and drying to obtain the manganous-manganic oxide material for the battery. The invention aims to adjust the morphology of the manganous-manganic oxide finished product by controlling reaction conditions, effectively reduce the granularity of the product and enhance the uniformity of particle size distribution.

The invention discloses a high-entropy metal oxide catalyst as well as a preparation method and application thereof in CO catalytic oxidation, and belongs to the technical field of flue gas treatment. The preparation method comprises the following steps: dissolving copper salt, manganese salt, cerium salt, cobalt salt, vanadium salt and a dispersing agent into water to form a uniform solution, and slowly adding excessive alkali precipitant into the uniform solution to form a solid-liquid mixture; the solid-liquid mixture is transferred into a high-pressure kettle to be subjected to a hydrothermal reaction and then quenched, an obtained hydrothermal reaction product is calcined, and the high-entropy metal oxide catalyst is obtained and is high in catalytic oxidation activity on carbon monoxide at the low temperature, excellent in water resistance and sulfur resistance and particularly suitable for treatment of complex flue gas.

The invention discloses a preparation method of a sodium ferromanganese vanadium phosphate material of a sodium battery positive electrode. The preparation method comprises the following steps: S1, preparing a hydrophosphate solution and a manganous salt solution; and S2, adding the hydrophosphate solution into the manganous salt solution, and reacting to obtain the manganous hydrogen phosphate crystal nucleus slurry. And S3, filtering and washing the manganese hydrogen phosphate crystal nucleus slurry, adding water into the manganese hydrogen phosphate material to prepare slurry, heating to 85-95 DEG C, respectively adding a ferrous source and a phosphorus salt solution, and reacting to obtain the manganese iron hydrogen phosphate slurry. And S4, filtering, washing and drying the iron manganese hydrogen phosphate slurry, adding water into the dried slurry to prepare slurry, adding phosphoric acid, heating to 90-100 DEG C, reacting to obtain an iron manganese phosphate compound precipitate, and filtering, washing and drying the precipitate to obtain an iron manganese phosphate material. The sodium manganese iron vanadium phosphate product is prepared by adopting a coprecipitation method and high-temperature sintering, and the method has the advantages of short process flow, simple process, only one-time sintering, low energy consumption and the like.

The invention belongs to the technical field of waste lithium battery recovery, and particularly relates to a method for selectively extracting lithium from a waste lithium battery positive electrode material based on activation and oxidation, which comprises the following steps: mixing the waste lithium battery positive electrode material, an oxidizing agent, an activating agent and a solvent, stirring and leaching, and carrying out solid-liquid separation to obtain a lithium-rich leaching solution and valuable metal leaching residues; wherein the activating agent is one or more than two of divalent ferrite, divalent cobalt salt, divalent manganese salt, divalent copper salt and monovalent silver salt, and the waste lithium battery positive electrode material is selected from one or more than two of waste nickel cobalt lithium manganate batteries, waste nickel cobalt lithium aluminate batteries, waste lithium cobalt oxide batteries and waste lithium manganate batteries. Through the synergistic effect of the oxidizing agent and the activating agent, preferential extraction of lithium in the raw material is achieved in one step, the problem that the lithium loss amount is large in the later lithium extraction process is solved, and the method has the advantages of being easy and convenient to operate, short in technological process, good in lithium selectivity, high in lithium leaching rate, wide in temperature application range and low in recovery cost.

The application discloses a preparation method of a catalyst for liquid-phase refining of crude octanol, and the preparation method comprises the following steps: (1) mixing pretreated fly ash and pseudo-boehmite, adding deionized water and nitric acid, stirring until a colloid is formed, drying the colloid, mixing the dried colloid with kaolin, and obtaining a carrier through kneading, extrusion molding, drying and calcination; (2) taking a nickel salt, a manganese salt and a zinc salt as active components, taking a calcium salt as an auxiliary component, dissolving the active components and the auxiliary component in deionized water to obtain a salt solution, adding n-hexane into the salt solution and stirring uniformly to prepare an impregnation solution, immersing the carrier in the impregnation solution, and obtaining the catalyst through washing, drying and calcination. The catalyst prepared by the method is mainly used in a liquid-phase refining reaction process of crude octanol, and has high activity stability and selectivity.

The invention provides a preparation method of a manganese-based Prussian blue sodium ion battery positive electrode material, which comprises the following steps: firstly, adding a mixed solution of a part of manganese salt and a chelating agent into a sodium ferrocyanide solution at a first flow rate in a protective atmosphere for reaction; and continuously adding the residual mixed solution of the manganese salt and the chelating agent into the reaction system in the previous step at a first flow rate, adding the mixed solution of the transition metal salt and the chelating agent at a second flow rate, reacting again, and aging to obtain the manganese-based Prussian blue sodium-ion battery positive electrode material. The chelating agent is used for assisting coprecipitation to synthesize the Prussian blue analogue coated manganese-based Prussian blue sodium ion battery positive electrode material with stable heterogeneous lattices, so that the volume change and particle cracking of the positive electrode material in the charging and discharging process can be effectively inhibited in the circulating process, and the structure collapse is prevented; the cycle stability of the positive electrode material in the charge-discharge process is effectively improved, and the cycle life of the battery is prolonged.

The invention discloses a metal element doped MnO2 and MnFe oxide composite catalyst as well as a preparation method and application thereof, and belongs to the technical field of flue gas desulfurization and denitrification. The preparation method comprises the following steps: dissolving potassium permanganate, divalent manganese salt and doped metal salt in water for reaction to prepare metal element doped MnO2; and mixing and reacting with a template agent, ferric salt and sodium salt, drying and roasting to obtain the final catalyst. The MnO2 electronic structure is modulated by doping metal elements, and the three-dimensional porous structure of the MnFe oxide is constructed by using the template agent, so that the catalyst has efficient adsorption and strong catalytic oxidation capacity, NO and SO2 can be synergistically removed at the same time, and the catalyst has desulfurization and denitrification activity in a wide temperature range of 30-300 DEG C, and is suitable for industrial production. And liquid ammonia does not need to be used in the purification process, so that the purification agent is high in safety and is particularly suitable for purification treatment under complex flue gas conditions in the non-electric industry.

The application discloses a preparation method of a manganese residue-based catalyst and application thereof, and belongs to the technical field of solid waste treatment. The application comprises the following steps: manganese residue is added into water and uniformly mixed to obtain a manganese residue turbid liquid; a soluble manganese salt solution and a potassium permanganate solution are mixed, and then added into the manganese residue turbid liquid to perform a hydrothermal reaction; and after washing and drying, a manganese residue-based catalyst is obtained. The catalyst prepared by using the manganese residue as a main raw material can efficiently degrade common organic wastewater, and the purpose of "waste treatment by waste" is achieved. In addition, the raw material manganese residue and the modifier are cheap and easy to obtain, the preparation method is simple, the production cost is low, and the application is beneficial to industrial popularization and use.

The invention discloses a citric acid regulated mesoporous lanthanum manganese perovskite catalyst, a preparation method and application, in the preparation method, lanthanum salt, manganese salt and citric acid are used as raw materials, a one-step fusion pyrolysis method is adopted for preparation, and the molar ratio of the lanthanum salt to the manganese salt to the citric acid is 1: (0.9-1.1): (1-3). The perovskite catalyst can catalytically degrade toluene waste gas with relatively high concentration, and relatively high toluene removal rate and mineralization rate can be obtained under the condition of low-temperature catalytic oxidation.

The invention belongs to the technical field of air power supplies, and relates to modification treatment of an oxide, in particular to a cerium oxide doped transition metal oxide and a preparation method thereof, an air cathode and an air power supply. The preparation method comprises the following steps: dissolving cerium salt, cobalt salt and manganese salt in water, uniformly mixing to obtain a mixed solution, adjusting the pH value of the mixed solution to 9-11, and carrying out a sedimentation reaction to obtain a sediment; and drying the precipitate, and calcining in an air atmosphere at 300 + / -10 DEG C for 2-4 hours to obtain the cerium oxide doped transition metal oxide. The cerium oxide doped transition metal oxide is cerium doped cobalt manganese oxide with a spinel structure, and the doping amount of cerium is 20 + / -1wt%. The cerium oxide doped transition metal oxide provided by the invention is applied to an air cathode as a catalyst, and has good stability and high catalytic activity. The performance of an air power supply containing the oxide is remarkably improved. The method for preparing the oxide provided by the invention is simple and easy to operate, and is suitable for large-scale production.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a high-entropy fluoride electrode material and a preparation method and application thereof. The preparation method of the high-entropy fluoride electrode material comprises the following steps: dispersing a surfactant in a solvent, adding a soluble iron salt, a soluble nickel salt, a soluble manganese salt, a soluble copper salt and a soluble chromium salt, uniformly mixing, and adding a fluorine source to obtain a precursor solution; the precursor solution is placed at the temperature of 120 DEG C to 140 DEG C for a reaction, uniform FeF3, NiF2, MnF2, CuF2 and CrF3 are formed, and a high-entropy fluoride precursor is obtained; and annealing the high-entropy fluoride precursor in a protective atmosphere to obtain the high-entropy fluoride electrode material. The high-entropy fluoride electrode material prepared by the invention shows excellent reversible capacity and excellent cycling stability.

The invention discloses a preparation method of a low-iridium-content catalyst for PEM electrolyzed water anode oxygen evolution, and belongs to the field of PEM electrolyzed water. The method comprises the following steps: (1) dissolving a manganese salt, potassium permanganate and a cerium salt in water, adding an acid, adjusting the pH value to 3-7, uniformly stirring, and aging to form a uniform suspension; then transferring into a reaction kettle, and carrying out hydrothermal reaction; roasting by using a muffle furnace to obtain a cerium-manganese-based metal oxide carrier; (2) adding iridium salt into deionized water, stirring, and carrying out ultrasonic dispersion to obtain an iridium-containing precursor solution; and adding the iridium-containing precursor solution into the cerium-manganese-based metal oxide carrier suspension, stirring and mixing, then carrying out ball milling treatment, washing and drying to obtain the supported low-iridium-content catalyst, namely the low-iridium-content catalyst for PEM electrolytic water anode oxygen evolution. The use amount of Ir is reduced, more active sites of Ir are exposed, and the performance of the catalyst is improved.

The invention provides a sodium vanadium fluorophosphate positive electrode material and a preparation method and application thereof, and belongs to the technical field of sodium ion battery positive electrode materials. The preparation method comprises the following steps: mixing sodium salt, a vanadium source, a phosphorus source, villiaumite and a carbon source in water, obtaining xerogel by adopting a sol-gel method, calcining to obtain a carbon-coated sodium vanadium fluorophosphate positive electrode material, dispersing the carbon-coated sodium vanadium fluorophosphate positive electrode material in water to form a suspension, adding polyvinyl alcohol and manganese salt, uniformly stirring, heating to evaporate a solvent, and annealing in inert gas to obtain the carbon-coated sodium vanadium fluorophosphate positive electrode material. The carbon and manganese dioxide synergistically co-coated sodium vanadium fluorophosphate positive electrode material is obtained. A sol-gel method and a suspension coating technology are combined to construct the carbon and manganese dioxide dual-coated NVPF composite material, so that the problems of slow sodium ion diffusion kinetics, low electronic conductivity, interface side reaction and the like when the NVPF is used as a sodium ion battery positive electrode material are solved.

The invention relates to the field of efficient integrated assemblies of PEM water electrolysis hydrogen production systems, and discloses an efficient integrated assembly for a PEM exchange membrane water electrolysis hydrogen production system, an anode electrode unit in the integrated assembly comprises a ruthenium-based high-entropy metal oxide electrocatalyst, and the ruthenium-based high-entropy metal oxide electrocatalyst comprises ruthenium, tin, manganese, chromium and tantalum elements; the preparation method of the ruthenium-based high-entropy metal oxide electrocatalyst comprises the following steps: grinding solid inorganic ruthenium salt, tin salt, manganese salt, chromium salt, tantalum salt and sodium chloride to obtain a metal salt mixture; carrying out ball milling to obtain a high-entropy metal oxide precursor; and carrying out heat treatment and water washing treatment on the precursor to obtain the ruthenium-based high-entropy metal oxide electrocatalyst. The invention also discloses application of the electrocatalyst in water electrolysis oxygen evolution reaction in an acid solution and water electrolysis hydrogen production reaction of a PEM proton exchange membrane, and the electrocatalyst shows excellent electrocatalytic activity.

The invention discloses an acidified soil conditioner and a preparation method thereof. The preparation method of the conditioner comprises the following steps: preparing a nano composite material: drying and crushing oyster shells, sieving and calcining to obtain oyster shell powder, namely the nano composite material; the preparation method comprises the following steps: preparing composite biochar powder: drying and grinding cleaned agricultural waste rice straws into powder, and carrying out sieving and calcining treatment to obtain straw biochar; mixing alkaline phosphate, sulfide, hemi-ferrite, manganese salt, clay, a microbial agent and straw charcoal in proportion to obtain composite charcoal powder; and preparing the acidified soil conditioner: compounding the nano composite material and the composite charcoal powder in proportion, and carrying out molding treatment on the complexing agent powder to obtain the acidified soil conditioner. The method has the beneficial effects that the available heavy metals in the soil can be reduced, the cation exchange capacity of the soil is enhanced, the acidification is neutralized, the soil fertility is improved, and the heavy metal pollution of the acidified farmland is repaired.

The invention discloses a catalytic system for preparing amine compounds through nitro reduction and application of the catalytic system. The catalytic system comprises an alkaline aqueous solution, a reducing agent and a catalyst, the alkaline aqueous solution is an alkali metal hydroxide aqueous solution; the reducing agent is alkali metal hydroboron and / or alkaline earth metal hydroboron; the catalyst is copper salt lewis acid and / or other lewis acid; the other Lewis acid is selected from one or a combination of more of cobalt salt, ferric salt, zinc salt, manganese salt and palladium salt. When the catalytic system is used for reducing the aromatic nitro-compound, the using amount of a reducing agent is small, meanwhile, the using amount of an organic solvent is reduced, the reaction yield is high, the reaction is milder, and amplified production of the process is facilitated.

The invention discloses a coal mine return air corner CO purification method based on catalytic oxidation, and relates to the technical field of coal mine return air corner CO purification, the coal mine return air corner CO purification method comprises the following steps: mixing manganese salt, cerium salt and a complexing agent by adopting a sol-gel coprecipitation method, stirring to form sol, and sequentially drying and calcining at high temperature to prepare a Mn-Ce-O composite oxide catalyst precursor; loading the Mn-Ce-O composite oxide catalyst precursor on a mesoporous carbon carrier subjected to hydrophobic modification treatment through an impregnation method, and carrying out drying and inert atmosphere heat treatment to obtain the low-temperature adaptive composite catalyst with an oxygen vacancy structure and moisture resistance, forming the low-temperature adaptive composite catalyst into a regular structure unit, filling the regular structure unit into a front end area of a reactor to form a first catalyst layer, filling a downstream area of the reactor with a thermal stability catalyst to form a second catalyst layer, and forming a catalytic reaction structure with an activity gradient along an airflow direction; the catalytic reaction structure with the activity gradient is integrated in a modular shell.

The invention provides a zinc ion structure battery, a preparation method thereof and application of the zinc ion structure battery in an energy storage device, and belongs to the technical field of batteries. The zinc ion structure battery is based on redox electrolyte and comprises a positive electrode, a zinc foil negative electrode and a diaphragm arranged between the two electrodes, the positive electrode is based on a carrier with good conductivity, and a certain amount of active substances or conductive substances are not attached to the carrier or attached to the carrier. A cementing material diaphragm is arranged between the two electrodes and is immersed in the electrolyte under negative pressure; according to the electrolyte, oxidation-reduction electrolytes such as manganese salt and iodized salt are added on the basis of zinc salt. The device needs to perform capacity excitation through a proper charging system, and the capacity excitation system comprises a constant-current charging part, a constant-voltage charging part and the like. The invention mainly provides a structural electrochemical energy storage device based on a cementing material diaphragm and a use method thereof. The structural electrochemical energy storage device can have relatively high energy density.

The invention discloses a lithium-rich manganese-based solid-state battery positive electrode active material and a preparation method and application thereof, and the preparation method comprises the following steps: S1, taking a manganese salt, a cobalt salt and a nickel salt, and preparing a mixed salt solution; s2, adding an oxalic acid solution into the mixed salt solution, and stirring to form an oxalate precipitate; s3, carrying out vacuum drying and collecting precipitates to obtain an oxalic acid precursor; s4, mixing and uniformly grinding the oxalic acid precursor, LiOH and Li2WO4 to obtain mixed powder; and S5, pre-sintering the mixed powder, then calcining, and naturally cooling to room temperature to obtain the composite material. The invention also discloses the lithium-rich manganese-based solid-state battery positive electrode active material prepared by the preparation method, and a battery positive electrode and a solid-state battery comprising the active material. Li2WO4 is introduced into the lithium-rich manganese-based solid-state battery positive electrode material to construct a Li < + > / e <-> transmission channel, so that the initial specific capacity of the battery is increased; and a protective layer is formed on the surface of the positive electrode material to enhance the redox reversibility and improve the cycle stability of the battery.

The invention belongs to the field of light modulators, and provides an electrochromic device based on reversible double electrodeposition and application of the electrochromic device. The electrochromic device sequentially comprises a first transparent substrate, a first conductive layer, an electrolyte layer, a second conductive layer and a second transparent substrate; the electrolyte layer comprises a solvent and an electrolyte additive, and the electrolyte additive comprises a manganese salt, a zinc salt and a redox medium. And the charge change in the manganese ion deposition / dissolution process is compensated through the reversible deposition / dissolution reaction of zinc ions in the electrolyte. In the coloring process, manganese ions are subjected to oxidation reaction on the surface of the first transparent conductive substrate to form manganese dioxide sediment; meanwhile, the zinc ions are subjected to reduction reaction on the surface of the second transparent conductive substrate to form metal zinc. And in the fading process, the sediment is dissolved, so that the device is recovered to the initial transparent state. In addition, dissolution of manganese dioxide and metal zinc can be accelerated by adding the oxidation-reduction medium, and the reaction kinetics of the device is improved.

The invention discloses a hydrophobic modified manganese-doped copper-based catalyst for preparing methanol through CO2 thermal reduction hydrogenation as well as a preparation method and application of the hydrophobic modified manganese-doped copper-based catalyst, and belongs to the technical field of catalysts. The preparation method of the catalyst comprises the following steps: mixing a metal salt mixed solution of a copper salt, a zinc salt, an aluminum salt and a manganese salt with an alkaline solution of a sodium salt, and controlling the pH value; heating, aging, standing and layering; washing the precipitate, drying and roasting to obtain a manganese-doped copper-based catalyst to be hydrophobically modified; the preparation method comprises the following steps: carrying out a hydrothermal reaction on divinyl benzene and a DMF solution of epoxy resin, washing and drying a white solid obtained by the reaction to obtain a hydrophobic material nano-porous polydivinyl benzene; the preparation method comprises the following steps: mixing a hydrophobic material and a manganese-doped copper-based catalyst to be hydrophobically modified, grinding, tabletting and forming to obtain the hydrophobically modified manganese-doped copper-based catalyst. The CO2 adsorption capacity of the catalyst is improved, the monatomic dispersion degree of the catalyst is promoted, and large-scale low-steric-hindrance hydrophobic modification of an active phase is realized.

The invention relates to a high-entropy metal oxide catalyst and a preparation method and application thereof.The preparation method comprises the following steps that S1, ferric salt, cobalt salt, manganese salt, nickel salt, copper salt and organic alkaline matter are mixed to obtain a mixed solution, hydrothermal reaction is conducted, and a precursor is obtained; and S2, calcining the precursor at the temperature of 500-600 DEG C to obtain the high-entropy metal oxide catalyst. The high-entropy metal oxide catalyst uniformly doped with iron, cobalt, manganese, nickel and copper is prepared by adopting a hydrothermal reaction and calcination method, and the high-entropy metal oxide catalyst not only can efficiently catalyze ozone to remove antibiotics, but also can still keep an excellent antibiotic removal rate constant in a water body containing hetero ions and humic acid; and the anti-interference capability is excellent.

A manganese iron oxide and a preparation method thereof, and a preparation method for lithium manganese iron phosphate cathode materials are provided. The preparation method for the manganese iron oxide includes the following steps: Configuring a mixed salt solution containing the first complexing agent, antioxidant, manganese salt, and iron salt; mixing the mixed salt solution, the second complexing agent, oxidant and deionized water to undergo a complexation-oxidation-precipitation reaction, filtering, washing, and drying a precipitate obtained after the reaction to obtain a manganese iron oxide. The preparation methods for the manganese iron oxide and lithium manganese iron phosphate cathode materials are simple, the physical and chemical indexes of the product are controllable, the raw materials are easy to obtain, the cost is low, the reaction conditions are mild, the corrosion resistance requirements of the equipment are not high, the technical difficulty is low, and it is easy to scale production.

The invention discloses a preparation method and application of a high-entropy layered double hydroxide oxygen evolution catalyst, and relates to the field of oxygen evolution reaction catalysis, and the preparation method comprises the following steps: S1, washing foamed nickel in absolute ethyl alcohol and deionized water, and then carrying out ultrasonic treatment in a hydrochloric acid solution to obtain pretreated foamed nickel; s2, adding ferric salt, cobalt salt, nickel salt, manganese salt, zinc salt and a proper amount of urea into deionized water, then adding ammonium fluoride, and uniformly stirring to obtain a mixed solution; and S3, transferring the mixed solution and the pretreated foamed nickel into a reaction kettle, carrying out a hydrothermal reaction, and washing and drying the obtained product to obtain the high-entropy layered double hydroxide oxygen evolution catalyst. According to the method, the key regulation and control effect of NH4F on the structure, chemical and electro-catalytic properties of HELDHs in the synthesis process of the HELDHs is analyzed, and the performance enhancement is attributed to NH4F-induced morphology and crystal engineering and catalytic active cation vacancies generated in situ through selective leaching of Zn < 2 + > and adsorption of sulfate under the alkaline condition.

The preparation method mainly comprises the following steps: dissolving chloroplatinic acid, lanthanum salt and manganese salt in water according to a certain proportion, adding a complexing agent, adjusting the pH value, and carrying out gelation, drying and high-temperature calcination to obtain a perovskite precursor; and treating in a reducing atmosphere, so that platinum atoms are selectively dissolved out from crystal lattices, high-dispersion platinum nanoparticles are formed on the surface, and finally, the composite catalyst with extremely low platinum loading capacity is obtained. According to the method, platinum species are stably anchored through the perovskite carrier, the platinum atom utilization rate and catalytic stability are remarkably improved, excellent electrocatalytic activity and durability are shown in the oxygen reduction reaction, and the method can be widely applied to energy conversion equipment such as zinc-air cells and fuel cells and has important practical application value.

The invention relates to the technical field of gas deoxidation, and particularly discloses a deoxidizer and a preparation method thereof. The preparation method of the deoxidizing agent comprises the following steps: S1, dissolving lanthanum salt, manganese salt and nickel salt in water, adding citric acid, adjusting the pH value, heating and mixing, spray-drying, heating and preserving heat, switching a mixed gas of O2 and N2, and heating and sintering to obtain particles A; s2, cerium salt, manganese salt and nickel salt are dissolved in water, citric acid is added, pH is adjusted, heating mixing, spray drying and heating sintering are conducted, and particles B are obtained; and S3, mixing the particles A and the particles B, grinding for 4-5 hours, adding a dispersing agent and water, uniformly mixing, adding a magnesium modified ceramsite carrier, carrying out vacuum impregnation for 45-55 minutes, carrying out solid-liquid separation, drying, carrying out heat preservation for 110-150 minutes in a mixed gas of H2 and N2 at 480-520 DEG C, and cooling to obtain the deoxidizer. The deoxidizing agent provided by the invention has excellent deoxidizing capacity.

The invention belongs to the technical field of immunology, and discloses a manganese salt adjuvant system based on dextran particle capsule shrinkage and a preparation method and application thereof.The manganese salt adjuvant system comprises beta-dextran particles GPs of a hollow spherical shell structure from yeast and manganese hydroxide colloid encapsulated in the dextran particles, the preparation method comprises the following steps: soaking the GPs in a MnCl2 solution, after the inner cavity of the GPs fully absorbs the MnCl2 solution, separating the GPs adsorbing MnCl2, then adding the GPs into a NaOH solution, forming stable manganese hydroxide colloid by manganese ions in the inner cavity of the GPs, and washing after separation to obtain the dextran particle encapsulated manganese salt adjuvant system. The GPMnOH particles carry various antigens at the same time in various modes such as electrostatic adsorption, chemical coupling or hydrophobic interaction, and an ideal carrier is provided for co-delivery immunization of the antigens and adjuvants.

The present invention discloses a potassium-sodium co-doped manganese dioxide nanomaterial and its preparation and application. The present invention comprises the steps of dissolving silicate and manganese salt and mixing them to prepare a precursor; and treating the precursor by alkali etching. The potassium ions and sodium ions pre-embedded between the manganese dioxide layers stabilize the layered structure of the crystal, widen the interlayer spacing, and make the embedding and extraction of zinc ions and hydrogen ions smoother through electrostatic shielding. At the same time, the prepared potassium-sodium co-doped manganese dioxide nanomaterial has a unique nano-flower sheet structure, which increases the contact area of ​​the reaction. The electrochemical test results show that the potassium-sodium co-doped manganese dioxide nanomaterial has a good reversible specific capacity as a positive electrode material for zinc ion batteries. At a current density of 0.5 A / g, the high specific capacity can reach up to 239.1 mAh / g after 600 cycles.