12results about How to "Abundant specific surface area" patented technology

The invention relates to the technical field of electrode materials, in particular to a composite silicon negative electrode material suitable for a sulfide-based all-solid-state battery and a preparation method and application thereof, and the preparation method comprises the following steps: (1) generating a metal organic framework material on the surface of a nano silicon material through an in-situ growth method; (2) carbonizing the metal organic framework material on the surface of the nano silicon material through calcination treatment to form a nitrogen-doped porous carbon material, so as to obtain a Si-NC material; and (3) generating a sulfide solid electrolyte on the surface of the Si-NC material through an in-situ growth method to obtain the Si-NC-SE composite silicon negative electrode material. According to the invention, the surface of the Si material is coated with the nitrogen-doped porous carbon material (NC) through an in-situ generation technology, and the sulfide solid electrolyte is generated in situ, so that the conductivity of the composite silicon negative electrode material and the cycling stability of the sulfide-based all-solid-state battery adopting the composite silicon negative electrode material are improved.

The invention relates to a porous foamy carbon material and a preparation method thereof. The preparation method comprises the following steps: mixing alloy powder, a liquid carbon source and dry ice, and reacting in a supercritical carbon dioxide medium environment formed under a sealed heating condition to prepare the porous foamy carbon material. According to the preparation method disclosed by the invention, the porous foamy carbon material with a special morphology structure can be prepared, the strength and the structural stability of the carbon material are improved, and the application requirements in multiple fields can be met.

The preparation method of the carbon material catalytic electrode material provided by the present invention can form a core-shell structure in which the core is a metal-N-doped carbon core with a low surface work function and the shell is a MAX semiconducting phase, the core or small microsphere inside the core-shell structure has a low surface work function, forming a high catalytic carbon core, and can prevent the direct contact between the catalytic carbon core and the electrolyte, greatly reducing the shedding of metal-doped atoms and the occurrence of side reactions, the outer polymer large microsphere inherits the topological structure of the phenolic-phenolic amine-pyrrole polymer, can effectively regulate the carbonization reaction process of the conjugated skeleton, and the side chain carbon formed while the shell directly constructs a developed pore structure can further selectively adsorb and desorb the reactant, greatly improving the catalytic efficiency of the electrocatalytic material. Thereby, the catalytic electrode material finally prepared produces a large current density and a high Faraday efficiency at a low overpotential, and can ensure that the catalytic electrode material has high mechanical strength.

This invention relates to a porous carbon material with a hierarchical distribution, its preparation method, and its application. The pores of the porous carbon material include: a first micropore (less than 10%), a second micropore (5%–15%), a first mesopore (15%–25%), a second mesopore (50%–70%), a third mesopore (1%–10%), and a fourth mesopore (less than 1%). The first micropore has a pore size of less than 1 nm; the second micropore has a pore size of greater than or equal to 1 nm but less than 2 nm; the first mesopore has a pore size of greater than or equal to 2 nm but less than 4 nm; the second mesopore has a pore size of greater than or equal to 4 nm but less than 7 nm; the third mesopore has a pore size of greater than or equal to 7 nm but less than 10 nm; and the fourth mesopore has a pore size of greater than or equal to 10 nm but less than or equal to 50 nm. The silicon-carbon composite material prepared using this porous carbon material has a high amount of nano-silicon deposition and good uniformity. Applying the silicon-carbon composite material to lithium-ion batteries can improve the battery's initial efficiency and specific capacity.

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

The invention belongs to the technical field of functional material preparation and catalysis and transition metal review materials, and discloses a coupling hydrogen evolution selenide heterojunction catalyst, a method and application. During preparation, a cobalt source and a mixed solution of urea, foamed nickel and ammonium fluoride are subjected to hydrothermal synthesis in a reaction and cooled to the room temperature; the preparation method comprises the following steps: preparing a precursor Co (OH) 2 / NF, washing with ethanol and water, drying to obtain a precursor Co (OH) 2 / NF, adding selenium powder and strong base into a reaction kettle, heating and selenizing to obtain the high-density heterojunction catalyst NiSe-coated CoSe2 / NF, the obtained heterojunction material can be used for electro-catalysis of 5-hydroxymethylfurfural, the potential is 1.29 V when the current density is 10mAcm <-2 >, and the optimal conversion rate exceeds 98%. And the catalyst has excellent catalytic activity of electro-catalysis of oxidation of 5-hydroxymethylfurfural.

The invention provides a cobalt phosphide-porous carbon nanoflower composite material and a preparation method thereof, a lithium ion battery and electric equipment, and relates to the field of lithium ion batteries. The preparation method comprises the following steps: carrying out first mixing on cobalt salt, hexamethylenetetramine, water and ethylene glycol, and carrying out hydrothermal reaction to obtain cobalt hydroxide nanosheets; carrying out second mixing on the cobalt hydroxide nanosheets and sodium citrate, and carrying out first calcination on the obtained mixture in an inert atmosphere to obtain a first calcined product; and carrying out third mixing on the first calcined product and red phosphorus, and carrying out second calcining on the obtained mixture in an inert atmosphere to obtain the cobalt phosphide-porous carbon nanoflower composite material. Cobalt hydroxide nanosheets are prepared by adopting a simple hydrothermal method, then the cobalt hydroxide nanosheets are respectively calcined with sodium citrate and red phosphorus to prepare the cobalt phosphide-porous carbon nanoflower composite material, the prepared cobalt phosphide is small in particle size, the ion diffusion length can be shortened, and rapid transmission can be realized.

The invention belongs to the technical field of negative electrode materials, and relates to a preparation method and application of an amorphous metal oxide nanorod negative electrode material. The preparation method of the amorphous metal oxide nanorod negative electrode material comprises the following steps: uniformly mixing an organic ferric salt and an organic manganese salt, adding an organic ligand, stirring until precipitate appears, cleaning the precipitate, performing freeze drying, and then performing heat treatment to obtain the amorphous metal oxide nanorod negative electrode material. By adopting the nanorod structure, more reaction sites can be provided so as to promote the intercalation and deintercalation rates of lithium ions; due to the one-dimensional characteristic of the nanorod, the diffusion path of lithium ions in the material is shortened, and the rapid charging and discharging capacity is enhanced. In addition, the amorphous structure is adopted, so that the mechanical stress of the material can be reduced, and the cycling stability is improved; the electronic conductivity is superior to the performance of the same crystal state, and the overall conductivity of the battery can be effectively improved.

The application relates to a sodium ion battery electrode material, in particular to a preparation method of a phosphate or fluorophosphate polyanion compound and application of the phosphate or fluorophosphate polyanion compound in a sodium ion battery electrode material; the iron-based phosphate polyanion compound has one or two or more of structures shown in formula I, formula II, formula III, formula IV or V, VI: Na4Fe3(PO4)2P2O7, Na3Fe2(PO4)1P2O7, NaFePO4, Na2FeP2O7, Na2FePO4F, Na5Fe2(PO4)2F3; the prepared phosphate or fluorophosphate polyanion compound is uniform in granularity, complete in carbon coating, high in purity and good in electrochemical performance, especially in rate performance.

The invention belongs to the technical field of comprehensive utilization and preservation of agricultural by-product resources, and particularly relates to capsicum straw nanocellulose hydrogel as well as a preparation method and application thereof. The capsicum leaf essential oil-loaded capsicum straw nanocellulose hydrogel provided by the invention is prepared from polyvinyl alcohol, sodium alginate, capsicum straw nanocellulose, capsicum leaf essential oil Pickering emulsion and water. Due to the unique fiber network structure of the capsicum straw nanocellulose, the hydrogel forms a more uniform and interconnected porous structure, has a huge specific surface area, is distributed with abundant active sites, and can efficiently load and stably release active substances such as capsicum leaf essential oil and the like. The capsicum leaf essential oil-loaded capsicum straw nanocellulose hydrogel provided by the invention has excellent oxidation resistance and mechanical properties, also has good water absorption and water retention capacities, and can create a suitable moist environment, so that water loss of fruits and vegetables is avoided, and rotting caused by excessive moisture is avoided, thereby effectively prolonging the shelf life of the fruits and vegetables.

The application relates to the field of water treatment, and particularly discloses a material membrane and a method for extracting humic acid in leachate. The material membrane comprises, by weight, 10-20 parts of polyvinyl alcohol, 5-10 parts of nano-aluminum oxide, 3-5 parts of mesoporous molecular sieve, 1-3 parts of glycerol and 80-100 parts of deionized water; the preparation method comprises the following steps: uniformly mixing the polyvinyl alcohol, the nano-aluminum oxide, the mesoporous molecular sieve, polyethylene glycol diacrylate and the glycerol, adding the deionized water, stirring and dissolving under the condition of temperature rising to 75-80 DEG C to obtain a mixed solution, pouring the mixed solution into a plane mold, drying and forming the plane mold under the condition of temperature of 50-60 DEG C, and keeping warm for 10-14 hours to obtain the material membrane. The material membrane is used for extracting humic acid in leachate, and has the advantages of reducing the content of humic acid in the leachate.

The application provides a copper-nickel alloy catalytic electrode and a preparation method and application thereof. The copper-nickel alloy catalytic electrode comprises a nickel foam substrate and a copper-nickel alloy vertically loaded on the surface of the nickel foam substrate, the molecular formula of the copper-nickel alloy is Cu 0.81 Ni 0.19 , and the copper-nickel alloy is a nanostructure with a dendritic morphology. The preparation method comprises the following steps: adding copper sulfate, nickel sulfate and ammonium sulfate into water, stirring uniformly to obtain an electrolyte; taking the nickel foam substrate as a working electrode, a saturated silver-silver chloride electrode as a reference electrode, a platinum sheet or a graphite rod electrode as a counter electrode, applying a constant current density to the working electrode to obtain a preset electrode; alternately cleaning the preset electrode with ethanol and distilled water, and vacuum drying to obtain the copper-nickel alloy catalytic electrode. The copper-nickel alloy catalytic electrode prepared by the application has a dendritic morphology, rich active sites and a high specific surface area, and has excellent catalytic activity and stability in the hydrogen production by the electro-catalytic coupling hydrogen evolution reaction of cyclohexanone synthesis adipic acid.