162 results about "Oxygen vacancy" patented technology

This invention discloses an Au / CeO2-BTC nanozyme based on strong metal-support interactions and its application in electrochemical glucose detection. The nanozyme uses a Ce-BTC metal-organic framework as a precursor, which is calcined to obtain a porous CeO2-BTC support rich in oxygen vacancies. Gold nanoparticles are then loaded onto the support via in-situ deposition. The product forms Au-O-Ce interfacial active sites and exhibits significant strong metal-support interactions, enabling electronic regulation and enhancing CeO2-support electrochemical detection. 3+ The content is increased and the charge transfer rate is accelerated. The electrode modified with this Au / CeO2-BTC nanozyme exhibits excellent catalytic performance for glucose oxidation, with a sensitivity of 41.3 μA·cm. ‑2 ·mM ‑1 The detection limit is as low as 4.75 μM, and it exhibits good reproducibility, stability, and selectivity.

This invention belongs to the field of gas sensor technology and discloses a method for preparing europium ferrite nanosensors and their applications. This method utilizes electrospinning technology combined with a specific low-temperature confined-domain calcination process (550℃~700℃) to prepare EuFeO3 nanotubes with a hollow structure and rough surface by taking advantage of the thermal decomposition kinetics differences of poly(p-v) magnets (PVP). This process effectively suppresses excessive repair of lattice oxygen while forming a unique tubular morphology, effectively "freezing" oxygen vacancies (O2) accounting for up to 34.44% on the material surface in situ. v This invention addresses the shortcomings of traditional solid fiber materials by constructing a sensor using a grinding, dispersion, and coating process. Utilizing the dual reactive surfaces of hollow nanotubes and high-concentration oxygen vacancy active sites, it achieves highly sensitive and selective detection of low-concentration ethylene gas released during fruit ripening. This invention solves the problems of small specific surface area and insufficient active sites in traditional solid fiber materials.

This invention belongs to the field of semiconductor optoelectronic device manufacturing technology and discloses a multi-stage annealing process for ITO thin films, including the following steps: Step 1: Under high vacuum protection, the furnace temperature is raised from room temperature to a first temperature T1 and held for a first time; Step 2: The furnace temperature is raised to a higher second temperature T2 and held for a second time, without the need for oxygen introduction during the second holding stage; Step 3: While maintaining the second temperature T2, a third holding stage is performed, and oxygen is introduced during the third holding stage; Step 4: A controllable cooling process is performed, which includes at least a slow cooling stage under the oxygen atmosphere and a rapid cooling stage under an inert gas or extremely low oxygen concentration atmosphere. This invention achieves precise staged control of the ITO thin film crystallization process, oxygen vacancy filling, and interfacial reactions by precisely controlling the oxygen partial pressure and cooling rate at different temperature stages.

The application relates to a diffusion parameter determination method and device, computer equipment, a storage medium and a program product. The method comprises the following steps: obtaining a first energy parameter of a target fuel cell under an oxygen vacancy structure and second energy parameters of the target fuel cell under a plurality of oxygen vacancy structures; processing the first energy parameter and each second energy parameter to obtain a free energy parameter corresponding to each oxygen vacancy structure; determining a target oxygen vacancy concentration according to the free energy parameter corresponding to each oxygen vacancy structure; constructing a structure model according to the target oxygen vacancy concentration, and solving the structure model through an ab initio molecular dynamics (AIMD) algorithm to obtain a target diffusion parameter corresponding to the target oxygen vacancy concentration; each oxygen vacancy structure refers to a structure corresponding to different oxygen vacancy concentrations in the target fuel cell. The method can improve the accuracy of the determined diffusion coefficient.

This invention discloses a supported zirconium-based catalyst, its preparation method, and its application. It includes a zirconium-based support and a noble metal supported on the zirconium-based support. The zirconium-based support includes one or more of a zirconium-based composite oxide support and a zirconium-based metal-organic framework material. The zirconium-based composite oxide support includes a composite of zirconium oxide and other oxides, and the other oxides include oxides of one or more elements selected from Si, P, Ce, and Mg. The above-mentioned supported zirconium-based catalyst increases the interaction between the supported noble metal and the support by introducing Si, P, Ce, or Mg into the zirconium-based support to adjust the electron cloud density or oxygen vacancy concentration of the zirconium-based support. By using a zirconium-based metal-organic framework material with regular channels to support the noble metal, reactants and products can diffuse relatively quickly and smoothly, thereby avoiding excessive side reactions and carbon deposition caused by excessive retention of reaction intermediates or products.

This invention discloses a method for preparing a Bi3O4Br catalyst for the efficient degradation of tetracycline, comprising the following steps: S1, mixing bismuth nitrate and potassium bromide in an aqueous solution at room temperature, stirring, and filtering after the reaction to obtain a precipitate; S2, washing and drying the obtained precipitate to obtain a BiOBr precursor; S3, placing the obtained BiOBr precursor in a sodium hydroxide solution of a certain concentration and reacting at a certain temperature to obtain the Bi3O4Br catalyst. Experimental results show that the Bi3O4Br catalyst has a larger specific surface area and more photocatalytic active sites than pure Bi3O4Br, and has a higher oxygen vacancy (OV) concentration, exhibiting high catalytic activity in the photocatalytic degradation of tetracycline. This photocatalyst has broad practical value and application prospects.

The application discloses a wet oxidation catalyst, which comprises the following raw materials in percentage by weight: 0.1-2% noble metal, 1-10% graphene-based material, and the rest is a carrier, wherein the carrier is modified titanium dioxide, specifically, a rare earth-transition metal-oxygen vacancy-mesoporous three-dimensional gradient titanium dioxide carrier. The application aims at solving the technical problem of poor stability of the catalyst.

This invention discloses a Cu-Mn-Al-Y composite catalyst, its preparation method, and its applications. The catalyst includes a composite oxide support and Cu elemental particles supported on the composite oxide support. The composite oxide support comprises a complex formed by Al oxide and Mn oxide, with Y element doped into the complex. In this Cu-Mn-Al-Y composite catalyst, the Cu elemental particles effectively lower the activation energy of the nitrogen dioxide hydrogenation to methanol reaction. By adsorbing and activating carbon dioxide, the Cu particles weaken the carbon-oxygen double bond in carbon dioxide, making it more susceptible to accepting active hydrogen (H) from hydrogen gas, thus promoting the hydrogenation of carbon dioxide to methanol. Y doping induces lattice distortion, increasing the oxygen vacancy concentration. The introduction of Mn and Y elements increases the number of moderately alkaline sites, promoting the adsorption and activation of carbon dioxide, which helps convert the adsorbed carbon dioxide into methanol, thereby improving the methanol conversion rate.

The application discloses a method for producing formaldehyde at low temperature, and belongs to the technical field of formaldehyde production. The method comprises the following steps: preparing a high-efficiency catalyst by taking iron nitrate nonahydrate, ammonium molybdate tetrahydrate and lithium hydride as raw materials; feeding mixed gas of methanol and air into a reactor filled with the high-efficiency catalyst under the condition that the temperature is 250-280 DEG C; and collecting gas at the outlet of the reactor to complete the method for producing formaldehyde at low temperature. The embedding of lithium can expand the crystal lattices of the catalytic products, thereby generating a large number of oxygen vacancies, enhancing the electron-donating capacity, and enabling the adsorption of p-formaldehyde to be quickly dissociated and the active sites to be quickly reduced at a relatively low temperature, so that the activity of subsequent catalysis is ensured. The plasma treatment can increase the surface area and the number of active sites of the high-efficiency catalyst, and further improve the catalytic activity. The method for producing formaldehyde at low temperature can improve the conversion rate of methanol and the yield of formaldehyde at a relatively low temperature, and is helpful to reduce energy consumption and reduce the volatilization of Mo.

The application discloses an in-situ testing method for an electron transmission mechanism of an oxygen vacancy modified SrTiO3@Ag nanotube photocatalyst, and belongs to the technical field of energy materials. The method steps are as follows: first, SrTiO3 nanotubes are prepared by an in-situ electrospinning method; a SrTiO3@Ag nanotube is prepared by using a photoreduction method to anchor Ag nanoparticles near oxygen vacancies to construct a Schottky heterojunction. The electron absorption characteristics of the oxygen vacancies and the Ag nanoparticles provide a driving force for the transfer of photo-generated electrons, and the synergistic effect of the oxygen vacancies and the Ag nanoparticles greatly promotes the separation of photo-generated carriers. Subsequently, the migration direction of the photo-generated carriers in the system is characterized by in-situ irradiation XPS technology. By using the in-situ testing method, it is proved that the oxygen vacancies can serve as a "bridge" to transfer the photo-generated electrons activated by the SrTiO3 nanotubes to the active site Ag nanoparticles for a photocatalytic reduction reaction, and the electron transmission mechanism under the catalytic reaction condition is revealed. The method can provide a more convenient, more scientific and more actual scene conforming research mode for the research on the electron transmission mechanism of a photocatalyst with vacancies.

This invention belongs to the field of electrocatalytic materials and water electrolysis for hydrogen production, and discloses a Ni-RuO x Modified catalytic materials and their preparation methods, OER catalytic applications, and water electrolysis devices are disclosed. The preparation method of the catalytic material involves treating a mixture containing a ruthenium source, a nickel source, and potassium bromide with oxygen plasma to obtain a modified Ni-RuO2 precursor. The oxygen plasma treatment process is carried out at a temperature of 150-200℃ and a power of 100-150 W. The modified Ni-RuO2 precursor is then thermally annealed under a protective atmosphere at a temperature of 200-300℃ to obtain the Ni-RuO2 precursor. x Modified catalytic materials. This invention demonstrates that the preparation method described herein can achieve in-situ uniform doping of nickel in the RuO2 lattice, precise control of oxygen vacancies, and directional construction of discrete nanoparticles. This invention also demonstrates that the preparation method can significantly improve the OER performance of the prepared materials.

This invention relates to a NiFe hydroxide-supported TiO2 2‑x Preparation method and application of Pt atom cluster water electrolysis catalyst; the preparation method firstly involves in-situ growth of nickel-iron layered bimetallic hydroxide NiFe LDH nanosheets on a three-dimensional porous nickel foam substrate via a hydrothermal method, and then coating the surface of the nanosheets with a layer of titanium dioxide (TiO2) rich in oxygen vacancy defects. 2‑x By utilizing oxygen vacancy defects as anchoring points, extremely low-quantity, highly dispersed, and stable loading of platinum atoms was achieved. Combined with polyvinylpyrrolidone (PVP), PVP@Pt / TiO2 was successfully prepared. 2‑x @NiFe / NF catalyst. This invention is used for the electrocatalytic hydrogen evolution reaction, featuring low Pt loading, low HER overpotential, multiple catalytic active sites, and excellent electrocatalytic activity for hydrogen evolution. It also exhibits excellent stability under continuous operation, showing broad application prospects in the future hydrogen production industry.

This invention relates to the field of semiconductor technology, specifically to a molecular junction of a metal oxide semiconductor and its applications, wherein the molecular junction is composed of oxygen vacancies and hydroxyl groups, which are bonded to the same metal atom to form an oxygen vacancy-hydroxyl metal oxide molecular junction (Oxygen vacancy-hydroxyl metal oxide, V). O (-M-OH). The molecular junction of this invention can achieve efficient hole injection / transmission, optimize interface band arrangement, and effectively suppress dark current.

This invention relates to a modified zero-valent iron / biochar composite material with oxygen-rich vacancies and its application. The modified zero-valent iron / biochar composite material comprises a biochar carrier and zero-valent iron loaded on the biochar carrier. The surface of the zero-valent iron is coated with sulfur-containing iron compounds and / or boron-containing iron compounds, and the surface of the zero-valent iron contains abundant oxygen vacancies. The modified zero-valent iron / biochar composite material is specifically prepared by the following method: dispersing the biochar carrier and zero-valent iron in oxygen-free water and grinding; adding a sulfur source or boron source to the ground suspension, stirring and grinding thoroughly, and drying; subsequently soaking in a reducing solution, followed by high-temperature calcination and cooling to obtain the modified zero-valent iron / biochar composite material. Compared with the prior art, the modified zero-valent iron / biochar composite material prepared by this invention can be used synergistically with compound oxidants to achieve effective remediation of organically contaminated soil.

This invention discloses a phase-field method for multi-topological domain cyclic transformation in lead titanate (PTO) ferroelectric thin films. A computational model of the PTO ferroelectric thin film is established, defining polarization, potential, displacement, and oxygen vacancy concentration as field variables. Based on Ginzburg-Landau theory, a total free energy expression for the PTO ferroelectric thin film is established, incorporating oxygen vacancy transport processes and the coupling between oxygen vacancies and the electrostatic field. Combining time-correlated Ginzburg-Landau kinetic equations, mechanical equilibrium equations, electrostatic equilibrium equations, and Nernst-Planck equations, a phase-field model of the PTO ferroelectric thin film coupled with multiple physics fields is established. A stable initial skyrmion domain structure is constructed, and a preset uniform electric field sequence is applied to simulate the cyclic transformation process between skyrmions and flux-closed domains and / or stripe domains. This method can analyze the evolution path, transformation threshold, oxygen vacancy distribution, and cyclic stability of topological domains in PTO ferroelectric thin films under the synergistic effect of an applied electric field and oxygen vacancies, providing a theoretical basis for the design of ferroelectric topological domain multi-state storage devices.

The present application relates to the field of catalyst technology, in particular to a transition metal-based heterojunction catalyst based on oxygen vacancy bridging, a preparation method and application thereof in water treatment. The transition metal-based heterojunction catalyst comprises a metal oxide and a corresponding zero-valent metal or a corresponding mixed-state metal oxide stacked in sequence, and forms a heterojunction with an interface rich in oxygen vacancies. A built-in electric field is spontaneously formed at the interface of the heterojunction based on the Fermi level difference, and a non-symmetric structure of electron-deficient sites and electron-rich sites is formed at the interface. Oxygen vacancies form a continuous electron transfer channel between the electron-deficient sites and the electron-rich sites as an electron bridge, realizing the cyclic transfer of electrons between the electron-deficient sites and the electron-rich sites, so that the interface of the heterojunction can simultaneously activate the oxidizing agent based on the free radical path and the non-free radical electron transfer path, improving the activation performance of the transition metal-based heterojunction catalyst.

This invention discloses an IGTO sputtering target, its preparation method, and its applications. The IGTO target of this invention comprises the following components by mass percentage: In₂O₃ content of 40%–80%, SnO₂ content of 10%–30%, Ga₂O₃ content of 10%–30%, GaN content of 0.01%–2%, and TiO₂ content of 0.1%–3%, with the sum of all components being 100%. The IGTO sputtering target of this invention uses Ti and N elements for doping, which effectively suppresses oxygen vacancies and reduces carrier concentration in the sputtered film. Especially with specific combinations of Ti and N elements, the effect on mobility is not significant. Using Ti instead of Ga can reduce the cost of target raw materials, and the sputtering target of this invention can be applied to thin-film transistors in the display field.

This invention discloses a defect-state indium oxide photothermal catalyst, its preparation method, and its application. The catalyst is indium oxide (In₂O) containing oxygen vacancies. 3‑x The catalyst exhibits a co-doped cubic and hexagonal crystal structure. The oxygen defects include oxygen vacancies and unsaturated In(III) sites associated with these vacancies. The preparation method involves a solvothermal reaction of indium nitrate and urea in a 50-95 v / v% ethanol aqueous solution to obtain the precursor c / h-InOOH. The precursor is then calcined to obtain c / h-In2O3. Finally, c / h-In2O3 is heat-treated with a reducing agent to construct oxygen defects. This invention, through crystal doping and the synergistic structure of oxygen defects in In2O3, enables the catalyst to possess full-spectrum absorption capabilities, more efficient carrier separation capabilities, and photothermal synergistic capabilities, thereby improving the efficiency of photothermal catalytic degradation of PFOA.

The present application relates to the technical field of detection, and relates to a preparation method of an oxygen-rich vacancy Mn3O4 nanoscale enzyme, and the method comprises the following steps: step one: adding KMnO4 into deionized water according to a ratio of 0.5-1.5 g:500 ml, and completely dissolving to obtain a mixed solution; step two: adding oleic acid according to a volume ratio of 1:50, and continuously stirring at 25-35 DEG C for 4-6 hours; step three: collecting the precipitate, washing with deionized water and ethanol alternately for 4-6 times, drying at 70-90 DEG C for 8-12 hours, and calcining at 180-220 DEG C for 4-6 hours, so as to obtain an oxygen-rich vacancy Mn3O4 nanoscale enzyme with oxidase activity; and the oxygen-rich vacancy Mn3O4 nanoscale enzyme can detect nitrite rapidly, sensitively and specifically.

The application relates to a nano photocatalyst and a preparation method and application thereof. The application relates to an oxygen vacancy-rich Ag2MoO4 / BiOCl nano photocatalyst, which is formed by Ag2MoO4 and BiOCl to form an interlaced Z-type heterojunction, wherein the mass fraction of Ag2MoO4 is 1-15%. The preparation method of the photocatalyst comprises the following steps: S1, adding 0.1503g of BiOCl into 50ml of deionized water and carrying out ultrasonic treatment to realize dispersion; S2, adding 0.0068-0.0363g of AgNO3 solution into the suspension obtained in step S1 drop by drop, continuously stirring to obtain a suspension A; S3, dissolving 0.0014-0.0204g of Na2MoO4.2H2O in 20ml of water to obtain a solution B, continuously stirring, adding the solution A drop by drop, stirring for 0.5-1 hours and standing; and S4, cleaning the obtained precipitate by using deionized water and anhydrous ethanol for several times, and drying to obtain an Ag2MoO4 / BiOCl heterojunction nano material. The application solves the problems of low visible light utilization rate, low photoelectron hole separation efficiency and easy recombination of a photocatalytic material, effectively improves the photocatalytic activity of BiOCl, and has the advantages of simple synthesis method, greenness, safety, low cost and the like.

The application belongs to the technical field of electrode materials, and particularly relates to a Nb2O5-based confined fiber electrode material in the field of lithium energy storage, wherein spinning sol is prepared by electrospinning of carbon tubes, a self-sacrificial template, a polymer carbon source and a niobium source through regulation of electrospinning parameters, and then a membrane material is obtained through pre-oxidation-carbonization. The electrode material uses capillary carbon tubes as an effective mechanical enhancement framework of a fiber cage, improves the overall mechanical strength of the fiber material under the cage structure, and limits T-Nb2O5-x rich in oxygen vacancy defects in the fiber cage, so that a membrane electrode material with both porosity and flexibility is prepared, and the membrane electrode material has excellent electronic conductivity.

This invention discloses a sea urchin-shaped oxygen-rich vacancy O vac This paper describes a CuO@ZIF-8 core-shell structured photothermal catalyst, its preparation method, and its application, belonging to the fields of photocatalytic materials and artificial nitrogen fixation technology. The technical solution is as follows: the catalyst has a core-shell structure, with the core being urchin-shaped copper oxide (CuO) microspheres. These microspheres are assembled from radially arranged one-dimensional nanoneedles or nanospikes, and the surface of the core contains oxygen vacancies (O). vac The shell is an in-situ grown ultrathin zeolite imidazole ester framework material, ZIF-8, which possesses hydrophobic and molecular diffusion channel properties. This invention also constructs a matching biomimetic three-phase interface photothermal reaction system. Through the synergy of a hydrophilic substrate supplying water and a hydrophobic, permeable shell, it achieves a balance between gas diffusion and proton supply, reducing the submersion of active sites by liquid water and the occurrence of side reactions. This invention has significant advantages such as high photothermal conversion efficiency, mild preparation conditions, and high gas-liquid interface mass transfer efficiency.

This invention relates to an additive for thermal desorption of polycyclic aromatic hydrocarbon (PAH) contaminated soil and its preparation method. It utilizes a composite oxide of manganese, rare earth metals, and transition metals to oxidize PAHs into low-carbon molecules during thermal desorption, achieving efficient removal, lowering the thermal desorption temperature, and saving energy consumption. The lower thermal desorption temperature reduces the loss of organic matter in the soil, facilitating the secondary use of the treated soil. The prepared composite oxide has a hollow spherical structure, which promotes sufficient contact and rapid reaction between PAHs and the composite oxide. The doping of transition metal elements into the manganese oxide and cerium oxide lattices creates oxygen vacancy defects, further enhancing the catalytic oxidation performance. Loading the manganese, rare earth metal, and transition metal composite oxide onto the surface of Fe3O4 improves its dispersion. Utilizing the magnetic properties of Fe3O4, the additive can be separated from the soil after desorption treatment, allowing for recycling.

This invention relates to an SFM-based fuel electrode, a solid oxide electrolyzer containing the same, and a method for preparing the same, comprising a perovskite matrix, wherein the perovskite matrix is ​​Sr₂Fe₂ doped at the B' site using Sc. 1.5 Mo 0.5 O 6‑δ The perovskite matrix is ​​optionally incorporating Ni at the B-site and / or supported with a YCoO3 second phase, wherein Y is selected from one or more of Pr, Nd, Sm, Eu, and Gd. This invention, by employing Sc to dope SFM-based perovskites at the B' site and selectively introducing Ni at the B-site and supporting a specific rare-earth cobaltate second phase, effectively enhances the oxygen vacancy concentration and ion transport capacity of the material, significantly accelerates the CO2 electrocatalytic reaction kinetics, and improves electrolysis activity under medium and low temperature conditions.

The application provides a chip and a preparation method thereof, a display panel and an electronic device, and relates to the technical field of semiconductors. The chip can form a two-dimensional electron gas at the interface between a channel and a passivation layer, improve the carrier concentration of the channel, and thus improve the driving current of the transistor. The chip comprises a substrate and a transistor arranged on the substrate. The transistor comprises a gate, a gate dielectric, a channel, a first electrode, a second electrode and a passivation layer. The gate, the gate dielectric and the channel are arranged in layers on the substrate, and the gate dielectric is used to electrically isolate the channel from the gate. The first electrode, the second electrode and the passivation layer are arranged on at least part of the surface of the channel, and the passivation layer is at least partially located between the first electrode and the second electrode. The surface of the channel comprises a first surface in contact with the passivation layer and a second surface in contact with the first electrode and the second electrode. The material of the channel comprises an oxide semiconductor, and the oxygen vacancy concentration of the first surface is greater than the oxygen vacancy concentration of the part of the channel other than the first surface and the second surface.

The application discloses a gradient electron regulation type noble metal-transition metal bifunctional catalyst and a preparation method and application thereof, and comprises active metal components A, auxiliary active metal components B, oxide carriers C and surface electron regulation components D. In the application, the noble metal is enriched on the outer layer of the carrier, directly participates in the surface catalytic reaction, the catalytic efficiency of unit mass noble metal is significantly improved, and excellent hydrogenation and dehydrogenation performance can be realized. The inner layer transition metal promotes hydrogen overflow and hydrogenation activity, the outer layer noble metal provides efficient dehydrogenation sites, and the two realize ordered division and cooperation in space through the gradient distribution structure, thereby solving the problem of disordered distribution of traditional two metals and insufficient cooperation effect. The gradient distribution structure reduces the migration and agglomeration tendency of metal particles in high-temperature circulation, the oxygen vacancies and basic sites of the oxide carrier inhibit carbon deposition, and the catalyst can maintain high activity and stability in multiple hydrogenation-dehydrogenation cycles, and the cycle life is significantly better than that of a conventional co-impregnated bimetallic catalyst.

This invention discloses a preparation method and application of a composite adsorbent based on iron and steel smelting dust, belonging to the field of environmental functional materials and heavy metal wastewater treatment technology. This invention proposes a synergistic modification strategy of "hierarchical enrichment – ​​low-temperature plasma activation – iron-lanthanum gradient doping – lattice vacancy hierarchical regulation – molding and solidification": firstly, the active components in the dust are concentrated and enriched through sieving, gravity classification, and magnetic selection; then, nanopores are etched and functional groups are introduced through low-temperature plasma activation to provide iron-lanthanum ion loading sites; a Fe-La stepwise equal-volume impregnation process is used to construct Fe-La-Mn ternary active centers in combination with Mn in the iron and steel smelting dust, and calcination is performed to form a multi-element heterojunction, La... 3+ With Ca in dust 2+ Lattice coordination lowers the formation energy barrier of oxygen vacancies; gradient oxidation-reduction treatment generates shallow and deep oxygen vacancies in stages, driving in-situ oxidation of As(III) and electron replenishment, respectively; finally, molding and solidification yields spherical adsorbents with a mechanical strength ≥16 N / particle. This invention enables the high-value utilization of iron and steel smelting dust, and the adsorbent is easy to recover and produces no secondary pollution, making it suitable for the deep treatment of arsenic-containing heavy metal wastewater.

This invention discloses a solid oxide fuel cell anode material and its preparation method based on zinc trap sites for direct, efficient electrochemical oxidation of ammonia. First, zinc-free Pr is prepared. 0.9 Cr 0.8 Ni 0.2 O 3‑δ The precursor, through zinc source impregnation and stepwise heat treatment, incorporates Zn 2+ By introducing partial substitution of Cr at the B-site of perovskite, zinc-doped perovskite material Pr is obtained. 0.9 Cr 0.8‑x Ni 0.2 Zn x O 3‑δ (0≤x≤0.4). This material, under a reducing atmosphere, Zn... 2+ The anode material, stably dissolved in the crystal lattice, forms strong Lewis acid "zinc trap" sites, which can specifically adsorb and activate ammonia molecules; simultaneously, it induces a high concentration of oxygen vacancies, optimizing the charge transfer process. These synergistic effects significantly enhance the catalytic activity of the anode for ammonia fuel, with a substantial reduction in electrochemical impedance in the mid-to-low temperature range. This phenomenon is presumably related to a shift in the reaction pathway towards the highly efficient "direct electrochemical oxidation of ammonia." The fabricated anode material achieves a power density of 292 mW / cm³ at 800℃ using pure ammonia as fuel. 2 It has good power output performance.

The application discloses an aluminum-based powder fuel with a grain boundary oxygen vacancy channel and a preparation method and application thereof, and particularly relates to the technical field of metal fuel and aluminum-based alloy powder fuel. The method comprises the following steps: heating and melting pure aluminum to form an aluminum melt; then adding an Al-RE intermediate alloy into the aluminum melt, and adjusting the total content of rare earth elements RE in the melt to be 0.1-7 wt%; finally, performing controlled supersonic atomization rapid solidification on the uniformly mixed melt to obtain an aluminum-based alloy powder. After the powder burns, a rare earth oxide channel rich in oxygen vacancy defects is constructed at the grain boundary, and the oxidation combustion is further promoted. The lattice distortion caused by the difference in atomic radii of double rare earth (Ce / La) and the in-situ solid solution of boron atoms greatly reduce the formation energy of oxygen vacancies. In the combustion process, high-concentration oxygen vacancies form a "high-speed oxygen transmission channel", break the barrier of the dense oxide film, and enable oxygen to quickly penetrate into the particle core, thereby significantly improving the burnout rate and energy release efficiency of the aluminum powder.

The application relates to the technical field of ceramic compositions, and discloses an X7R type MLCC anti-aging ceramic dielectric material and a preparation method thereof, which comprises barium titanate, magnesium oxide, lutetium oxide, manganese dioxide and glass frit; wherein magnesium ions and lutetium ions occupy titanium positions on the surface layer of the barium titanate crystal lattice and combine with oxygen vacancies to generate ternary composite defect clusters; the ternary composite defect clusters are locally distributed in the shell layer region of the barium titanate crystal grain and are used for improving the long-range electric migration activation energy of the oxygen vacancies; through the construction of an ion and electron double shielding network, the directional migration of the oxygen vacancies under high-temperature direct current bias is inhibited, the contradiction between the conventional anti-aging means and the dielectric constant maintenance is solved, the high dielectric activity of the polarization area of the barium titanate is ensured, the high-temperature insulation reliability of the ceramic dielectric material is enhanced, and the capacitance aging process is delayed.