20 results about "Oxidation-Reduction Activity" patented technology

The invention discloses a zirconium-doped nano zero-valent metal composite material as well as a preparation method and application thereof. The preparation method comprises the following step: in an aqueous solution, reacting transition metal salt with a zirconium source under the action of a reducing agent to prepare the zirconium-doped nano zero-valent metal composite material. The zirconium-doped nano zero-valent metal composite material is prepared through a liquid-phase in-situ reduction coprecipitation method, and the composite material has extremely high stability while showing excellent oxidation-reduction activity. Meanwhile, the composite material can be used as a Fenton-like catalyst to efficiently treat wastewater polluted by the organic chelating agent.

The invention discloses a novel organic material for an aqueous ammonium ion battery as well as a preparation method and application of the novel organic material, and belongs to the technical field of novel organic energy storage materials. According to the preparation method, the novel organic material PHAT-HKH is prepared by carrying out dehydration condensation reaction on cyclohexanehexone hydrate and 2, 4, 6-tri (1, 2-phenylenediamine)-1, 3, 5-triazine. The PHAT-HKH material prepared by the invention is rich in pyridine nitrogen, so that the oxidation-reduction activity of the material is improved. Meanwhile, a constructed hydrogen bond network enhances the structural stability of the material, and the ammonium ion energy storage performance of the material is improved under a synergistic mechanism.

The invention discloses a two-dimensional polyimide material and a preparation method thereof, a battery and an electric device. The two-dimensional polyimide material is a crystalline porous material, and the molecular structure of the two-dimensional polyimide material forms a ring shape so as to form nanoscale pores. According to the two-dimensional polyimide material, the ring-shaped molecules form an ordered crystalline porous structure, the surface area is large, a large number of point locations are provided for ion storage, a channel is provided for ion migration, rapid diffusion of electrolyte can be promoted, and oxidation-reduction active carbonyl can be approached; and the stability of the electrode material in the circulation process can be ensured, and the battery capacity can be improved.

The invention discloses a Cr8O21 active coated high-nickel NCM811 positive electrode material as well as a preparation method and application thereof, and relates to the technical field of new energy battery positive electrode material preparation. The material is formed by taking NCM811 as a core and coating the surface with a Cr8O21 active oxide layer. In the low-temperature calcination process, Cr8O21 reacts with residual alkali on the surface of NCM811 to generate LiCrO2 with high ionic conductivity, and the process not only reduces the content of the residual alkali on the surface, but also strengthens lithium ion interface transport kinetics through LiCrO2. The Cr8O21 forms a rapid lithium ion channel through alternate arrangement of [Cr < 3 + > O6] / [Cr < 6 + > O4] in a three-dimensional framework of the Cr8O21, so that mixed arrangement of cations is synergistically inhibited, interface kinetics is optimized, and oxidation-reduction activity is contributed. Therefore, through the design and optimization of the Cr8O21 active oxide coating layer, the synergistic improvement of the structural stability and the electrochemical performance of the high-nickel NCM811 positive electrode material is successfully realized.

The invention relates to the technical field of sodium-ion batteries, in particular to a P2-type layered metal oxide positive electrode material and application thereof in a sodium-ion battery. A conventional P2-phase positive electrode material Na < 0.67 > Mn < 0.5 > Ni < 0.5 > O < 2 > is poor in rate capability and rapid in cyclic discharge capacity attenuation. In order to solve the technical problems, the invention provides the P2 type layered metal oxide positive electrode material, the chemical composition of the P2 type layered metal oxide positive electrode material is Na < 0.67 > Mn < 0.5 > Ni < 0.2 > Li < 0.15 > Zn < 0.15 > O2, and the problems of low reversible specific capacity and poor rate capability of the Na < 0.67 > Mn < 0.5 > Ni < 0.5 > O2 positive electrode material are solved through co-doping of lithium and zinc. The lithium doping enhances the chemical bond between the transition metal and oxygen in the P2-type layered metal oxide, inhibits the migration and dissolution of transition metal ions, and improves the electrochemical stability of the positive electrode material. Zinc doping activates the oxidation-reduction activity of transition metal ions, and the specific discharge capacity of the positive electrode material is improved.

The invention provides a wide-voltage-window conductive MOFs (Metal-Organic Frameworks) material as well as a preparation method and application thereof. According to the invention, a coordination regulation strategy is applied, water molecules are introduced into a coordination structure of a metal organic framework as an axial auxiliary ligand through a hydrothermal synthesis method, and the water molecules and an organic ligand jointly form a stable hexa-coordination configuration. According to the coordination mode, the structural stability of the MOFs framework is enhanced to inhibit coordinate bond breakage, and direct contact between ions in an electrolyte and metal active sites is effectively blocked through the steric hindrance effect, so that framework collapse is avoided. Besides, water molecules are introduced as weak field ligands, the electronic state of a metal center is regulated and controlled, the oxidation-reduction activity of the metal center is reduced, and regulation and control of the performance of the conductive MOFs-based supercapacitor are achieved. The wide voltage window conductive MOFs material prepared by the invention shows a wider voltage window, a higher specific capacity, a shorter ion transmission channel and excellent cycling stability, and can be used for preparing a supercapacitor.

The embodiment of the invention provides a soil geological catalytic capability prediction method and related equipment, and belongs to the technical field of machine learning. The method comprises the following steps: acquiring redox active component data of to-be-predicted soil; the oxidation-reduction active component data are input into the trained prediction model for catalytic capability prediction, the electron accepting capability index and the electron supply capability index of the to-be-predicted soil are obtained, and the electron accepting capability index and the electron supply capability index are used for representing the soil geological catalytic capability. According to the embodiment of the invention, the evaluation efficiency and accuracy of the soil geological catalytic capability can be improved.

The application discloses a high-entropy oxide catalyst and a preparation method and application thereof. The high-entropy oxide containing Ni, Co and Mn is prepared by an oxalic acid coprecipitation method, oxalate and various transition metal ions are efficiently coordinated and precipitated, atomic-level uniform dispersion of metal elements is realized, a stable single-phase spinel structure is formed, and the oxidation-reduction activity, the lattice oxygen migration rate and the surface oxygen vacancy density of the material are greatly improved, and the deep degradation capacity of chlorobenzene is significantly enhanced.

The invention provides an electrode and a preparation method thereof. The electrode provided by the invention comprises a carbon matrix and a SnO2 / CeO2 catalyst loaded on the surface of the carbon matrix. According to the electrode disclosed by the invention, a layer of SnO2 / CeO2 catalyst is loaded and deposited on the surface of the electrode, so that the specific surface area of the electrode can be effectively increased, and active sites of electrochemical reaction are increased. When the material is applied to a flow battery, such as an all-vanadium flow battery, the hydrogen evolution reaction in the battery can be inhibited, the charge-discharge efficiency of the flow battery is improved, the oxidation-reduction activity of vanadium ions is improved, and irreversible capacity loss caused by precipitation of the vanadium ions on the surface of an electrode is prevented.

The invention discloses a glass through hole high-speed etching method based on laser-induced piezoelectric nano domain and chemical potential cooperative driving, which comprises the following steps: performing scanning modification on a glass substrate by adopting infrared-ultraviolet dual-band laser, and forming an oxygen vacancy concentration gradient in a modified area through time sequence regulation and control and gradient increase of power density along the thickness direction, constructing a chemical potential difference along the axial direction of the through hole; the modified glass substrate is immersed in Fe / HO composite catalytic etching liquid, an ultrasonic field is applied, the driving phase of the ultrasonic field and a pulse packet sequence of laser scanning are kept locked, the oxygen vacancy concentration gradient area generates a piezoelectric nano domain under the action of periodic stress, and the oxygen vacancy concentration gradient area generates a piezoelectric nano domain; the potential of the piezoelectric nano domain drives the active particles in the etching liquid to directionally migrate and react; and monitoring and maintaining the oxidation-reduction activity of the etching liquid in real time, and realizing anisotropic etching by utilizing the synergistic effect of the chemical potential difference and the piezoelectric potential until a through hole is formed.

The invention relates to the technical field of material chemistry, in particular to a GdFeO3 type B-site disordered high-entropy electrode material and a preparation method and application thereof. A sol-gel method is adopted, metal salt is used as a raw material, citric acid is used as a complexing agent, metal ions are mixed through citric acid crosslinking, and then a combustion reaction is performed to release heat to generate the GdFeO3 type B-site disordered high-entropy electrode material. The chemical formula of the material is Gd (FeCoNiCrMn) O3, and the crystal structure of the material is an orthogonal perovskite structure. According to the invention, through solid solution of various elements at a single lattice site, the oxidation-reduction activity and pulverization resistance of a GdFeO3 type electrode are improved, and a novel negative electrode material with high energy density and long cycle life is obtained. The preparation method is easy to operate and high in universality, the atomic proportion and the pore structure of the elements can be accurately controlled by changing reaction conditions, and different application scenes are met.

The invention provides a sodium vanadium oxide modified lithium-rich manganese-based positive electrode material and a preparation method thereof, and Na4V2O7 is utilized to carry out surface modification treatment on lithium-rich manganese-based matrix particles so as to construct a Na4V2O7 heterogeneous interface layer and matrix surface oxygen vacancies. Wherein the Na4V2O7 heterogeneous interface provides a VO4 tetrahedral three-dimensional ion transmission network for Li < + > diffusion, meanwhile, Na4V2O7 is used as a conversion agent to realize topological chemical ion exchange so as to induce the generation of surface oxygen vacancies, the additionally introduced oxygen vacancies reduce the oxidation reduction activity of oxygen ions in the first charge-discharge process, the irreversible escape of lattice oxygen is inhibited, and the performance of the lithium ion battery is improved. The reversibility of the oxidation-reduction reaction of oxygen ions and the stability of an oxygen framework structure are improved.

The invention belongs to the technical field of glass, and particularly relates to an antimony-based composite clarifying agent as well as a preparation method and application thereof. Wherein the antimony-based compound clarifying agent is prepared from the following raw materials in parts by weight: 10 to 30 parts of Sb2O3 nanospheres, 0.1 to 3 parts of Eu2O3, 10 to 20 parts of Ce (NO3) 3.6 H2O, 0.5 to 3 parts of CTAB (Cetyltrimethyl Ammonium Bromide) and 10 to 40 parts of urea; the Sb2O3 nanosphere serves as a clarification core and is uniformly wrapped by a rare earth shell layer composed of cerium and europium, the problem that a single component is prone to agglomeration is solved, and electron transfer and energy exchange are enhanced through interface chemical bonding. The oxidation-reduction activity of the shell cerium widens the antimony-based oxygen release temperature range, and makes up for the defect that the traditional antimony-based clarifying agent only takes effect at a high-temperature section; europium promotes bubble combination and floating by capturing free electrons in the melt, and forms an energy transfer effect with cerium at the same time to protect the stability of an antimony-based structure in the melting process.

The invention discloses a catalyst for catalytic purification of p-phenylenediamine process tail gas and a preparation method of the catalyst, belongs to the field of tail gas treatment, and relates to a bimetallic molecular sieve catalyst Cu / Fe-ZSM-5. The catalyst takes an H-ZSM-5 molecular sieve with a core-shell structure as a carrier, Cu < 2 + > and Fe < 3 + > active components are loaded through impregnation of a copper source and an iron source, and the catalyst is prepared through stirring, evaporation, drying and roasting processes. The catalyst shows excellent pollutant synergistic removal capacity at 300-550 DEG C, especially 450 DEG C, and the conversion rates of N2O, H2, CH3OH, C6H5NH2, NOX and the like are basically close to 100%. The stability and the carbon deposition resistance of the catalyst are remarkably improved through the shell-core structure design, the oxidation-reduction activity is optimized through the synergistic effect of double metals, and efficient purification of multi-component pollutants in tail gas is achieved. In addition, aniline serves as an endogenous reducing agent to participate in NOX removal, and dependence on a traditional NH3-SCR technology is reduced.

The invention discloses a Cu3 (MoO4) 2 (OH) 2 material as well as a preparation method and application thereof.The Cu3 (MoO4) 2 (OH) 2 material is synthesized by taking copper acetate and ammonium molybdate as raw materials and adopting a one-step hydrothermal method, the Cu3 (MoO4) 2 (OH) 2 material is of a rod-shaped cluster structure and has a developed pore system, the contact area between the material and an electrolyte is remarkably increased, more oxidation-reduction active sites of molybdenum and copper are exposed, and the oxidation-reduction activity of molybdenum and copper is improved. A sufficient reaction interface is provided for embedding / removing of ammonium ions, a continuous ion transmission channel is formed by multistage pores, and electrolyte infiltration and ion migration are accelerated. Meanwhile, gaps among particles in the Cu3 (MoO4) 2 (OH) 2 material cluster provide a buffer space for volume expansion in the NH4 < + > intercalation / deintercalation process, mechanical stress is reduced, material pulverization or structure collapse is avoided, the cycle stability is remarkably improved, and the problems that an existing water system ammonium ion battery positive electrode material is poor in stability, low in specific capacity and short in cycle life are solved.

The invention discloses a lithium-sulfur battery positive electrode additive material, a preparation method and a use method, and belongs to the field of energy storage materials, an additive is a composite material composed of a vinylidene-linked covalent organic framework (BTAN-DHTPA-COF) and polypyrrole (PPy), and the additive has oxidation-reduction activity and good conductivity. The composite material is prepared through an in-situ polymerization method and specifically comprises the following steps: firstly, synthesizing a two-dimensional layered COF material (BTAN-DHTPA-COF) with oxidation-reduction activity, and then initiating pyrrole monomer polymerization in a pore channel of the two-dimensional layered COF material to form a compound (PPy (at) BTAN-DHTPA-COF). The material can be used as a functional additive in a positive electrode of a lithium-sulfur battery, the shuttle effect is effectively inhibited by adsorbing and catalytically converting polysulfide, and the cycling stability and rate capability of the battery are improved. The electrode forming device is reasonable in structure, mild in preparation process, suitable for various electrode forming modes such as integrated slurry or layered coating and the like, and good in application prospect.

This invention relates to the field of organic synthesis, specifically to a method for the in-situ generation of an enone via the Wolff rearrangement of α-diazoketone, followed by reaction with a bifunctionalizing agent under transition metal catalysis to obtain an N-hydroxyphthalimide ester containing a quaternary carbon center. In this invention, α-diazoketone, tetrakis(triphenylphosphine)palladium, and the bifunctionalizing agent are sequentially added to a reaction solvent under a nitrogen atmosphere. The mixture is stirred at 25°C under 15W blue LED irradiation until the reaction is complete. After filtration and purification, the redox-active ester product containing a quaternary carbon center is obtained. The preparation method of this invention is simple to operate (the reactive enone participates in the reaction in situ via the Wolff rearrangement), overcoming the shortcomings of traditional methods that require complex tertiary carboxylic acids. It offers mild conditions and good substrate versatility.

The invention belongs to the technical field of new energy, and particularly relates to a lithium iron phosphate composite material and a preparation method and application thereof. The lithium iron phosphate composite material provided by the invention is composed of a lithium iron phosphate core and a coating layer, an anion and cation doping strategy is adopted, different doping strategies are adopted for particles with different sizes, high-cation and low-anion doping is adopted for large particles, and through anion and cation co-doping in a specific proportion, the lithium iron phosphate composite material is prepared. Lattice stress compensation is achieved through anion compensation, and the negative effect on the compaction density is reduced. And meanwhile, the oxidation-reduction activity can be enhanced by anion doping, the electronic conductivity is improved, and the rate capability is improved. A doping strategy of reducing cations and increasing the doping amount of anions is adopted for small particles, the local coordination environment of the FeO6 octahedron stabilized by anion doping is exerted, structural distortion is reduced, and the structural stability of the small particles is improved; the coating layer can reduce interface contact resistance, improve interface electron conductance and improve electrochemical reaction kinetics.

The invention relates to the technical field of aqueous zinc ion batteries, and particularly provides an aqueous zinc-iodine battery positive electrode material, a positive electrode plate preparation method and an aqueous zinc-iodine battery. The aqueous zinc-iodine battery positive electrode material comprises a positive electrode active material, wherein the positive electrode active material comprises quaternary ammonium salt bromide and an iodine-containing substance. The water-based zinc-iodine battery positive electrode material disclosed by the invention has relatively high oxidation-reduction activity and can realize a four-electron reaction from 2I <-> to 2I < + >, so that when the water-based zinc-iodine battery positive electrode material is used for assembling a water-based zinc-iodine battery, the specific discharge capacity, the rate capability and the cycle performance of the battery can be effectively improved; and bromine salt or chlorine salt electrolyte does not need to be additionally used in the electrolyte, so that the service life of the water-based zinc-iodine battery is prolonged, and the cost is controlled.