14results about How to "Reduce interface contact resistance" patented technology

This invention belongs to the field of chemical materials technology and discloses a silver-modified bismuthene core-shell material, a silver sulfide-modified bismuthene core-shell material, and their preparation methods. The preparation method of the silver-modified bismuthene core-shell material includes: preparation of a non-aqueous composite electrolyte; assembly of an electrochemical exfoliation system; electrochemical exfoliation and in-situ coating; and separation and washing of the product. The preparation method of the silver sulfide-modified bismuthene core-shell material includes: dispersion treatment; sulfur source configuration; in-situ conversion; and product separation. This invention constructs unique metal-semiconductor heterojunction and semiconductor-semiconductor heterojunction structures, exhibiting excellent interfacial bonding and stability. The green and efficient "one-pot" preparation process is suitable for large-scale industrial production.

The invention belongs to the technical field of flexible piezoelectric sensors, and relates to a carbon felt-hydrogel composite piezoelectric sensor and a preparation method thereof. The sensor comprises a piezoelectric sensing layer, a cross-scale dual-network hydrogel layer, an electrode layer, a leading-out wire and a packaging layer, the two cross-scale dual-network hydrogel layers are arranged on the upper side and the lower side of the piezoelectric sensing layer in a stacked mode to form a sandwich structure. The cross-scale dual-network hydrogel layer is an elastic hydrogel material formed by compounding a carbon fiber felt skeleton and a molecular-level network polymer, and the molecular-level network polymer penetrates through the interior and the surface of the carbon fiber felt skeleton and is formed by cross-linking and curing; the number of the electrode layers is two, and the two electrode layers are arranged on the outer sides of the two cross-scale dual-network hydrogel layers in a stacked mode respectively. The lead-out wire is electrically connected with the electrode layer; the packaging layer wraps the outer side of the electrode layer. According to the sensor, the mechanical property, the conductivity and the stability of the flexible piezoelectric sensor can be improved.

The invention provides an anion exchange membrane electrolyzed water cathode electrode and a preparation method thereof. The anion exchange membrane electrolyzed water cathode electrode comprises a carbon fiber substrate and cathode catalyst slurry cured on the surface of the carbon fiber substrate, and the cathode catalyst slurry comprises the following components in parts by mass: 20 parts of an anion ionomer, 10 parts of a catalyst, 5-9 parts of a 5% binder solution and 250-300 parts of a solvent; wherein a binder in the 5% binder solution is selected from at least one of polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polyvinyl alcohol and polyvinylpyrrolidone. The high-molecular binder and the anion ionomer are introduced to form a composite network, the binding force between the catalyst layer and the porous transmission layer is improved, the attenuation rate is low, the stability is high, and the problems of stripping and pulverization of the catalyst layer under the working conditions of strong alkalinity and high gas-liquid flow rate can be effectively solved.

The application discloses a method for improving the metalization connection strength of n-type Bi2Te3-based thermoelectric elements based on anchoring effect, and comprises the following steps: configuring a n-type Bi2Te3-based wafer surface treatment agent, the composition of which comprises 40-50% sulfuric acid (volume), 1-2% nitric acid (volume), and the rest is water; immersing a clean n-type Bi2Te3-based wafer into the surface treatment agent to perform surface etching; then immersing the etched n-type Bi2Te3-based wafer into ultrapure water to perform ultrasonic treatment; performing metalization connection on the ultrasonically treated n-type Bi2Te3-based wafer through electroplating or chemical plating, the plated metal is easy to form anchoring effect with the n-type Bi2Te3, the metalization connection strength is improved; and finally performing scribing and cutting to obtain the Bi2Te3-based thermoelectric elements with high metalization connection strength. The application makes the n-type Bi2Te3-based wafer have high surface roughness before electroplating, which is beneficial to forming anchoring effect with the plated metal such as nickel, so that the Bi2Te3-based thermoelectric elements with high metalization connection strength are obtained, and the thermoelectric elements are not physically damaged, and the product qualification rate can be improved.

This application relates to the field of lithium-ion battery manufacturing technology and discloses a method for preparing a stabilized positive electrode sheet for all-solid-state batteries. The method includes: dispersing positive electrode active material, sulfide solid electrolyte, and binder in a non-polar solvent under an inert atmosphere to obtain a positive electrode slurry; coating and drying to obtain a precursor layer; simultaneously applying pressure and temperature to the precursor layer for interface stabilization heat treatment; and cooling to obtain the positive electrode sheet. This invention utilizes a temperature-pressure coupling process to reduce the yield stress of the electrolyte and promote binder rheology through thermal effects, achieving electrode densification under relatively low mechanical pressure, effectively avoiding the problem of active material particle breakage caused by traditional high-pressure cold pressing processes. This method reduces the positive electrode interface impedance and enhances the interfacial bonding force, thereby significantly improving the structural integrity and cycle life of all-solid-state batteries.

The invention relates to the technical field of electrical contact materials, in particular to a SnO2 electrical contact material for a new energy electrical appliance and a preparation method of the SnO2 electrical contact material. The SnO2 electrical contact material comprises 8-15% of tin oxide, 0.5-3% of a composite additive, 0.1-2% of an accelerant and the balance of silver. According to the invention, yttrium ions and chromium ions can be partially dissolved in tin oxide crystal lattices, so that the thermal decomposition reaction of tin oxide at extremely high arc temperature is effectively inhibited, the material loss caused by tin element volatilization is reduced, the second additive generates a high-melting-point composite oxide phase after high-temperature calcination, and the high-melting-point composite oxide phase is uniformly distributed in a silver matrix; as a physical skeleton for resisting arc erosion, the accelerant mainly plays a role in dispersing and interface optimizing, and an interface compound containing zinc, lanthanum, boron and oxygen is formed after the accelerant is calcined, so that the wettability and binding force between tin oxide particles and a silver matrix are improved, uniform distribution of the tin oxide particles is ensured, local overheating and concentrated erosion are avoided, and the service life of the tin oxide particles is prolonged. Therefore, the mass loss of arc ablation is obviously reduced.

The application discloses a kind of supercapacitor negative high-efficiency composite electrode and preparation method thereof, including the block body iron of substrate and the outer layer PrNi x Fe 1‑x O3 conductive active layer, and Fe2O3 active layer between the two, by wet chemical etching and transient high temperature joule heat method in-situ synthesis active layer, and further utilize wet chemical brush coating and transient high temperature joule heat method in-situ synthesis conductive active layer, two are asymmetric sandwich structure, it is favorable to build charge transport path, improve charge transport efficiency, at the same time, can effectively relieve the volume change generated in the process of charge and discharge of iron oxide, unlike the characteristics of particle composite structure easy to collapse, inhibit the occurrence of electrode material pulverization, wherein, using transient high temperature joule heat preparation technology, layered in-situ build heterostructure, not only simple and fast, also make the structure compact and dense, maintain the stability of overall electrode structure, improve the long-period cycle charge and discharge capacity of electrode.

This invention provides a two-dimensional MOF / MXene heterojunction, its preparation method, and its applications, relating to the fields of nanomaterial preparation and sensing technology. The method involves transferring large-size two-dimensional MXene nanosheets to a substrate and fixing them on a rotating platform. Under rotation and illumination, a metal salt solution and an organic ligand solution are sequentially added to the MXene surface through a layer-by-layer assembly process. Centrifugal force is used to spread the solution and remove excess liquid. After cyclic reaction, a MOF layer is grown in situ on the MXene surface, forming a MOF / MXene heterojunction. This invention also provides the two-dimensional MOF / MXene heterojunction obtained by the above preparation method. Furthermore, this invention provides the application of the two-dimensional MOF / MXene heterojunction prepared by the above method in the field of sensing and detection. The sensor constructed based on this invention exhibits high sensitivity, low detection limit, and good stability, making it suitable for high-precision sensing and detection.

The invention discloses a binder-free transition metal sulfide composite nitrogen-doped graphene negative electrode material and a preparation method thereof, and belongs to the technical field of secondary battery negative electrode materials. According to the technical scheme, the preparation method comprises the following steps: 1) dissolving zinc nitrate, cobalt nitrate and nitrogen-doped graphene in a mixed solution of ethanol and water, uniformly mixing, adding ammonium fluoride and urea, and continuously stirring; 2) adding foamed nickel and the uniformly mixed solution into a high-pressure reaction kettle for hydrothermal treatment, cooling, washing and drying to obtain a Zn-Co-precursor; (3) calcining the Zn-Co-precursor in an inert atmosphere, and (4) adding the Zn-Co-precursor into a high-pressure reaction kettle containing a sulfur source for hydrothermal vulcanization treatment, washing and drying to obtain the ZnCo2S4-coated NGr / NF negative electrode material.The graphene negative electrode material can improve the overall performance and stability of a secondary battery.

The invention provides a surface modification method of high-chromium ferritic stainless steel for a fuel cell bipolar plate, and relates to the technical field of fuel cell surface engineering. The method comprises the following steps: annealing a high-chromium ferritic stainless steel cold-rolled substrate at 900-1000 DEG C to obtain a cold-rolled thin strip of which equiaxed ferritic grains are completely recrystallized inside, then removing a surface oxide layer, and carrying out constant-potential anodic passivation treatment in a nitric acid solution. According to the method, the dense gradient passive film rich in Cr2O3 is constructed in situ by utilizing the high oxidation potential of nitric acid electrochemical passivation. The method is suitable for a ferritic stainless steel system with the Cr content of 25 wt%-35 wt%, and especially when a matrix contains trace Ru, the method can induce a surface layer to form conductive RuO2 and construct a metal Ru nano seepage network in the film. According to the bipolar plate material treated through the method, the after-fracture elongation is kept to be larger than or equal to 25%, meanwhile, the interface contact resistance is reduced to 10 m omega.cm or below, the corrosion current density is lower than 10 microamperes / cm, and the strict service requirement of a fuel cell is met.

The application provides a red mud-based supercapacitor energy storage structure for road engineering application, and belongs to the technical field of road engineering and advanced building materials. The red mud-based supercapacitor comprises, from bottom to top, a first red mud-based composite electrode, a diaphragm and a second red mud-based composite electrode. The components of the first red mud-based composite electrode and the second red mud-based composite electrode comprise, by mass fraction, 40-60 parts of red mud, 10-15 parts of fly ash, 25-35 parts of cement, 5-15 parts of fine aggregate, 0.5-2 parts of Na2SO4 activator, 0.5-2 parts of conductive reinforcing material and 0.2-1 parts of reinforcing fiber. The first and second red mud-based composite electrodes are soaked in an electrolyte after initial setting, and the surface free liquid is removed after soaking and draining. The application adopts an electrode pore liquid absorption ion guiding mechanism, cancels the independent liquid electrolyte filling cavity in the existing road surface energy storage structure, and realizes the engineering configuration without free liquid electrolyte.

The invention belongs to the technical field of semiconductor technology and neuromorphic hardware, and discloses a metal halide film memristor and a preparation method and application thereof, and the metal halide film memristor provided by the invention comprises a bottom electrode, an inorganic resistive layer and a top electrode from bottom to top in sequence; the inorganic resistive layer is a metal halide thin film, and the metal halide thin film is a cuprous iodide thin film; the bottom electrode is made of indium tin oxide (ITO) and is used for inputting an electric signal of an external power supply; the top electrode is made of metal copper and is used for being connected with the ground; the cuprous iodide film is prepared by adopting a vacuum physical vapor deposition method; the metal halide film memristor provided by the invention can reach a large dynamic range of 6306 under-1V voltage stimulation, response current is at a microampere level, and the metal halide film memristor can be used for realizing neuron integral-emission function simulation due to good volatile characteristics and can be applied to a self-adaptive sensing system.

The invention relates to the technical field of sodium ion batteries, and discloses a diaphragm and a sodium ion battery using the diaphragm, the diaphragm comprises a porous base membrane and a functional coating coated on at least one surface of the porous base membrane; the functional coating is prepared from the following raw materials in parts by weight: 85-95 parts of a ferric sodium pyrophosphate active material, 4-10 parts of a binder and 1-5 parts of a conductive agent. In the sodium ion battery, one side of the diaphragm, which is provided with the functional coating, is arranged towards the positive pole piece, and the coating is in close contact with the positive pole through hot-pressing shaping. The high-proportion ferric sodium pyrophosphate is loaded on the diaphragm, and the sodium removal characteristic of the ferric sodium pyrophosphate during first-time charging is utilized, so that extra sodium ions are provided for the negative electrode to compensate for consumption formed by an SEI film, and the first-time coulombic efficiency and energy density of the battery are improved; meanwhile, high-temperature shrinkage of the base membrane is inhibited by utilizing a heat-resistant framework supporting effect of the coating, internal short circuit of the battery is prevented, and the thermal safety of the battery is enhanced.

The invention belongs to the technical field of electrochemical energy storage, and relates to a positive and negative differential integrated electrode for a static filmless zinc-bromine battery and a battery stack. The electrode comprises a flexible graphite composite bipolar plate, one side of the flexible graphite composite bipolar plate is compounded with a non-conductive negative electrode thin pre-oxidized felt subjected to oleophobic modification, the other side of the flexible graphite composite bipolar plate is compounded with a positive electrode thick activated graphite felt which has a gradient pore structure and is loaded with a bromine oxidation reduction catalyst, the contact side of the bipolar plate and the negative electrode felt is activated, and the three layers are compounded into an integrated structure. The stack is horizontally placed, positive and negative electrode felts of adjacent electrodes are directly attached and compressed, no diaphragm exists, and the compression ratio is controlled by a limiting column. Three-dimensional uniform deposition of zinc is guided through the negative electrode non-conductive felt, the bromine oil phase is locked through cooperation of positive electrode gradient pores and gravity settling, the contact resistance is reduced through the integrated structure, non-film static operation is achieved, the cycle life exceeds 500 times, the self-discharge rate is lower than 0.45%, the energy efficiency is higher than 80%, the structure is simplified, and the lithium ion battery is suitable for large-scale production.