6results about How to "Suppress stacking" patented technology

This invention relates to the field of batteries, and more particularly to a nitrogen-doped carbon / tungsten diselenide nanosphere composite material, its preparation method, and its applications. This invention achieves tight coupling between few-layer WSe2 nanosheets and a nitrogen-doped carbon framework through a process combining complexation-polymerization and subsequent selenization. The resulting material consists of nanosphere particles, providing more electrochemical active sites and shortening the zinc ion diffusion distance. By introducing a nitrogen-doped carbon framework, this invention effectively improves the overall conductivity of the composite material and suppresses the stacking and aggregation of WSe2 nanosheets during charge and discharge, thereby significantly improving rate performance and cycle stability.

The invention discloses a method for preparing MXene through fluoride-free alkali etching of an ultrasonic-assisted supercritical fluid technology, and relates to the field of MXene preparation.Fluorine-free green preparation of MXene is achieved through cooperation of supercritical carbon dioxide fluid and a high-frequency power ultrasonic technology and a fluoride-free etching agent. The preparation method comprises the following steps: introducing carbon dioxide to reach a supercritical state, carrying out an etching reaction in the supercritical state by adopting a stirring or fluid circulation mode, applying continuous or discontinuous high-frequency power ultrasonic treatment to the whole reaction system, recovering to normal pressure and normal temperature after the reaction is finished, collecting a product, washing and drying, thereby obtaining the high-purity silicon dioxide. The high-frequency vibration of the ultrasonic waves and the high diffusivity of the supercritical carbon dioxide are utilized to promote the etching agent to remove A-layer elements in the MAX phase, so that the use of a fluorine-containing etching agent is avoided, the environmental pollution is reduced, and the etching efficiency of the MAX phase is also remarkably improved.

The invention provides a zinc-rich heavy anti-corrosion coating and a preparation method thereof, and belongs to the technical field of coating compositions.The preparation method comprises the following steps that bisphenol A type liquid epoxy resin, zinc gluconate supported modified GO, a dispersing agent, a defoaming agent and a mixed solvent are mixed, fumed silica, polylactic acid and garnet composite powder and zinc powder are sequentially added and stirred, and a component A is obtained; mixing and stirring a polyamide curing agent and a curing accelerator to obtain a component B; mixing and stirring the component A and the component B, and defoaming to obtain the zinc-rich heavy anti-corrosion coating. According to the invention, the cathode protection effect and the shielding and blocking capability on a corrosive medium can be enhanced, so that the long-acting heavy corrosion resistance is improved.

This invention provides a zinc-rich heavy-duty anti-corrosion coating and its preparation method, belonging to the technical field of coating compositions. The method includes the following steps: mixing bisphenol A type liquid epoxy resin, zinc gluconate-supported modified GO, dispersant, defoamer, and a mixed solvent; sequentially adding fumed silica, polylactic acid@garnet composite powder, and zinc powder while stirring to obtain component A; separately mixing and stirring a polyamide curing agent and a curing accelerator to obtain component B; mixing and stirring component A and component B and defoaming to obtain the zinc-rich heavy-duty anti-corrosion coating. This invention can enhance the cathodic protection effect and the shielding and barrier ability against corrosive media, thereby improving long-term heavy-duty anti-corrosion performance.

The invention discloses a 2-x-terephthalic acid copper-based MOFs (Metal-Organic Frameworks) micro-nano sheet and a preparation method and application thereof, and the method comprises the following steps: dropwise adding a copper chloride dihydrate solution into a pre-deprotonated 2-x-terephthalic acid solution, stirring to react, and centrifugally washing and drying the product to obtain the 2-x-terephthalic acid copper-based MOFs micro-nano sheet, x is one of methyl, amino or hydroxyl. The 2-x-terephthalic acid copper-based MOFs micro-nano sheet can be used for electrocatalytic reduction of carbon dioxide. The 2-x-terephthalic acid copper-based MOFs micro-nano sheet prepared by the invention has a unique folded sheet structure, the specific surface area and the exposure degree of active sites of the material are remarkably increased, and mass transfer and charge transfer paths are shortened, so that the kinetics and energy efficiency of a catalytic reaction are integrally optimized.

The invention relates to the technical field of new energy materials, and discloses a high-performance electrochemical catalyst and a preparation process thereof, and the preparation process comprises the following steps: preparing a composite carrier with a carbon nanotube vertically growing on the surface of graphene through a chemical vapor deposition method; introducing nitrogen and sulfur heteroatoms by adopting plasma-assisted vapor deposition; enabling the metal precursor to be uniformly adsorbed on the carrier in a laminar flow state by utilizing a micro-fluidic reactor; and finally, carrying out stepped heating pyrolysis and annealing treatment to obtain a finished product. The obtained catalyst has a three-dimensional conductive network structure containing rich through pore channels, and iron and cobalt metal active centers are anchored to defect sites of a carrier in a coordination form. According to the process, atomic-scale dispersion of active components is achieved through a microfluidic technology, lattice stress is effectively eliminated in cooperation with stepped pyrolysis, the problem that the activity and stability of the catalyst are difficult to consider at the same time is successfully solved, the oxygen reduction catalytic performance is improved, the cycle life is prolonged, and the mass transfer performance under the large-current working condition is excellent.