19 results about "Double-layer capacitance" patented technology

The invention discloses a flexible pressure sensor based on ionized hydrogel and a preparation method thereof. The sensor adopts a sandwich layered structure of a flexible composite electrode, an ionized water gel dielectric layer and a flexible composite electrode, ionized water gel is used as a dielectric layer, and an upper flexible electrode and a lower flexible electrode are prepared from a multi-walled carbon nanotube / polydimethylsiloxane (MWCNTs / PDMS) composite material; the surface, making contact with the dielectric layer, of the electrode is copied through an abrasive paper template method to form a micron-sized rough structure. Under the action of external pressure, the effective contact area between the microstructure electrode and the ionized water gel dielectric layer and the equivalent electrode distance change, so that the interface electric double-layer capacitance is regulated and controlled, and high-sensitivity conversion from a pressure signal to a capacitance signal is realized. The flexible pressure sensor is simple in structure and excellent in flexibility, can be further integrated into a pressure sensing array, and is suitable for the fields of wearable electronics, electronic skin, man-machine interaction and the like.

The invention relates to an IrO2-Ta2O5 titanium anode coating based on graphene doping and temperature programming sintering synergistic enhancement and a preparation method of the IrO2-Ta2O5 titanium anode coating, and belongs to the technical field of electrode material preparation. According to the method, graphene is doped in an IrO2-Ta2O5 coating, the content of the graphene is controlled to be 0.2-0.8 mg / mL, preferably 0.6 mg / mL, the content of iridium is 26 g / m, and a 200-500 DEG C temperature programming sintering process is adopted. By optimizing the graphene dispersing and sintering process, the conductivity, the electrocatalytic activity and the structural stability of the coating are remarkably improved. Experimental results show that the coating has lower charge transfer resistance and higher electric double layer capacitance and oxygen evolution reaction activity, and the strengthening life of the coating exceeds 1100 hours and is far longer than that of a traditional titanium anode coating. The method is suitable for high-requirement electrochemical scenes such as electrolytic copper foil and chlor-alkali industry, and has a good industrial popularization prospect.

The invention discloses an MEMS device and a manufacturing method thereof, and the method comprises the steps: forming a first MEMS structure: providing a first substrate, forming a first sensing layer on the first substrate, and sequentially forming a first cavity and a second sensing layer on the first sensing layer; forming a second MEMS structure: providing a second substrate, forming a third sensing layer on the second substrate, and sequentially forming a second cavity and a fourth sensing layer on the third sensing layer; bonding the second sensing layer and the fourth sensing layer to form a common sensing layer; the part, corresponding to the first cavity, of the first substrate is removed, and the first sensing layer forms a movable sensing layer. According to the MEMS device and the manufacturing method thereof provided by the invention, the stacked double-layer capacitor structure is prepared by adopting a heterogeneous bonding mode, the process is simple, the implementation is high, the prepared device structure does not need to be plugged, the problem that the sensing layer is uneven due to hole plugging is avoided, and the reliability of the device is improved. The reliability problems of air leakage and the like of the hole blocking structure caused by repeated pressure measurement motion of the upper-layer pressure sensing film of the sealing cavity are also avoided, and the service life and the yield of the device are improved.

The invention discloses a device for performing direction control and separation on charged particles in electrolyte, which comprises a microfluid channel, the microfluid channel is provided with a sample inlet port and a sample outlet port, a fluid flows from the sample inlet port to the sample outlet port at a speed v0, a separation chamber is formed in the microfluid channel, the fluid contains the charged particles, and the separation chamber is communicated with the sample inlet port and the sample outlet port. Charged particles are separated in the separation chamber; the number of the electrodes in each group of electrodes is the same or different, each electrode is in contact with the fluid, a pseudocapacitor and / or a double-layer capacitor are / is formed on the contact interface of the electrode and the fluid, the electrodes are arranged in the microfluid channel in parallel, and a certain angle can be formed between the arrangement direction and the flowing direction of the fluid; a plurality of conductor leads; and each driving power supply is connected with one group of electrodes, the driving power supplies generate periodic voltage or current excitation, and the voltage excitation or the current excitation output by the driving power supplies in an output period is in a changing state.

The present invention relates to a method for treating a surface (10a) of a part (10) of an implantable medical device (1), the method comprising the steps of: providing the part (10), the part (10) comprising a surface (10a) comprising titanium, exposing the surface to a gas (G) containing nitrogen, and applying laser light (L) to the surface (10a) to create a titanium nitride (TiN) layer (11) on the surface (10a) having an increased double layer capacitance compared to the untreated surface (10a).

The invention relates to a high-modulation-efficiency phase modulator based on a silicon nitride-lithium niobate waveguide. The modulator comprises an optical transmission unit and an electric transmission unit, the optical transmission unit comprises a quartz substrate layer, a silicon dioxide buffer layer arranged above the quartz substrate layer, a composite waveguide arranged above the middle position of the silicon dioxide buffer layer, and a silicon dioxide cladding covering the outer side of the composite waveguide; the electric transmission unit comprises a metal traveling wave electrode, and the metal traveling wave electrode adopts an embedded double-layer capacitor microstructure load traveling wave electrode. By optimizing the design of the electrode structure and the waveguide structure, the modulation efficiency is remarkably improved, broadband response and low optical loss are considered at the same time, and the device is suitable for application scenes sensitive to phase modulation efficiency and power consumption, such as high-speed optical fiber communication, coherent optical transmission systems, optical phased arrays and quantum optical experiments.

A capacitive sensing film, a smart diaper and a wetness detection system device including the capacitive sensing film. The capacitive sensing film includes a metal film electrode, a flexible substrate, and a waterproof protective layer; the metal film electrode is deposited on the flexible substrate, and the waterproof protective layer covers the metal film electrode and forms an interlayer, adapted to protect the metal film electrode; the metal film electrode has a smooth surface and a nanoscale thickness, adapted to reduce the surface area in contact with a liquid through the gap of the interlayer; when the capacitive sensing film is wetted by the liquid containing electrolyte, the electric double layer capacitance generated between the metal film electrode and the liquid is smaller than the electrolytic capacitance generated between the metal film electrode and the liquid, thus a wetness detection function based on electrolytic capacitance is realized.

This invention relates to a method for operating an electric vehicle and an electric vehicle comprising: an electrical drive unit for the vehicle's driving motion; a control unit for controlling the vehicle's driving motion; a first energy storage device, particularly configured as a rechargeable battery device, for supplying a first DC voltage to the control unit; a second energy storage device, particularly configured as a double-layer capacitor device, and / or the second energy storage device charging and discharging faster than the first energy storage device, for supplying a second DC voltage to the drive unit; and a power supply unit, particularly intermittently providing a DC output voltage, wherein the first energy storage device is connected to the second energy storage device, particularly electrically, via a conversion device, wherein the connection between the first energy storage device and the power supply unit, particularly an electrical connection, is such that the DC output voltage is substantially equal to the first DC voltage, wherein the conversion device converts the first DC voltage to the second DC voltage, and wherein power flow from the second energy storage device to the first energy storage device is prevented.

The present disclosure relates to the technical field of electrode materials and provides a titanium-based platinum-nickel electrode material, a preparation method, and an application thereof. The method includes: performing a first anodic oxidation and a second anodic oxidation sequentially on a titanium sheet in an ammonium fluoride solution to obtain an oxidized titanium sheet; performing calcination on the oxidized titanium sheet to obtain a titanium sheet containing a titanium dioxide layer; and performing electrodeposition on the titanium sheet containing the titanium dioxide layer in a platinum-based electrolyte to obtain the titanium-based platinum-nickel electrode material. The prepared titanium-based platinum-nickel electrode material effectively reduces the usage amount of Pt-based precious metals and can maintain high activity and stability to generate hydrogen peroxide on-line under the neutral condition; its cathode current density efficiency reaches 76.40%, the anode current density efficiency reaches 70.23%, and the bilayer capacitance value is 1.33 mF·cm−2, which is 4.2 times the bilayer capacitance value of the titanium-based platinum-nickel electrode material obtained without anodic oxidation, and has a very good industrial application prospect.

A device for estimating electrical properties of an electrolyzer (103) includes a data processing system (102) for estimating electrical values ​​of the electrolyzer, such as membrane resistance, based on the initial value and decay time constant of the electrolyzer's differential voltage, current (I), and double-layer capacitance voltage during shutdown of the electrolyzer. The differential voltage is the difference between the electrolyzer's voltage (U) and the electrolyzer's total reversible voltage. The initial value and decay time constant of the double-layer capacitance voltage are estimated based on the value of the differential voltage when the current is zero and the differential voltage is equal to the double-layer capacitance voltage. The electrical values ​​can be estimated even if a gradual interruption of the electrolyzer's current is not possible.

The application relates to the preparation and application of a capacitive deionization electrode for treating low-concentration fluoride ion wastewater, and belongs to the technical field of capacitive deionization. A cerium-nitrogen co-modified turbo layered carbon material prepared by taking a supramolecule as a precursor, forming a carbon skeleton through pyrolysis and then performing metal modification control is used as an anode, carboxyl activated carbon is used as a cathode, and the cathode and the anode jointly form a capacitive deionization system. The cerium-nitrogen co-modified turbo layered carbon material electrode has a layered loose controllable mesoporous structure, a large number of active sites caused by unsaturated coordination vacancies and excellent electric double-layer capacitive behavior. The cerium-nitrogen co-modified turbo layered carbon material electrode has excellent fluoride ion adsorption capacity in low-concentration fluoride-containing wastewater, specifically, the adsorption rate is fast and the adsorption capacity is large, and the effluent concentration can reach below the relevant standard. The capacitive deionization electrode material has a good engineering application prospect in actual wastewater treatment.

The invention relates to the technical field of sensing of aquatic water ion detection, and discloses a solid-state contact layer of an all-solid-state ion selective electrode, FeCoNi-coated ZIF-8 doped with three transition metals of iron, cobalt and nickel is synthesized through a one-pot method, nano porous carbon based on ZIF-8 is generated through pyrolysis, and finally a transition metal doped ZIF-8-derived carbon nanomaterial is obtained. And mixing the carbon nanomaterial with a hydrophobic material and an ionic liquid to construct an ion-electron transduction layer of the all-solid-state ion selective electrode with excellent hydrophobic performance. The solid-state contact layer prepared by the invention not only can effectively inhibit the formation of a water layer between an ion sensitive film and a conductive substrate and solve the problem of potential drift of an ion selective electrode in measurement, but also has the advantages that the electric double-layer capacitance effect of the carbon nanomaterial and the synergistic pseudocapacitance effect among various transition metals act together; and the ion-electron transduction capability of the electrode is improved.

The present invention relates to a method for assessing the corrosive state of a reinforced-concrete component (1) comprising reinforcing steel (5), comprising the steps: providing a first conductor (LA) and establishing an electrical connection between the first conductor (LA) and a first section of the reinforcing steel (5) for the use thereof as an anode (100), and providing a second conductor (LK) and establishing an electrical connection between the second conductor (LK) and a second section, the second section being a section of the reinforcing steel (5) which is spatially separated from the first section, or a section of a steel element present outside the reinforced-concrete component (1), for the use thereof as a cathode (110); establishing a disconnectable electrical connection between the first conductor (LA) and the second conductor (LK) outside the reinforced-concrete component (1); determining the double-layer capacitance (CDL,A, CDL,K) of the anode (100) and of the cathode (110) and / or of the surface (AA, AK) of the anode (100) and of the cathode (110) on which the double-layer capacitance (CDL,A, CDL,K) is based; forming a mathematical relation of the double-layer capacitances (CDL,A, CDL,K) to one another or of the surfaces (AA, AK) to one another; and assessing the formed relation on the basis of exactly one or at least one predetermined criterion.

An apparatus for performing direction control and separation on particles in an electrolyte. The apparatus comprises: a microfluidic channel (1), wherein the microfluidic channel (1) has a sample inlet (11) and a sample outlet (12), such that a fluid flows at a velocity V0 through the sample inlet (11) toward the sample outlet (12), a separation chamber is formed inside the microfluidic channel (1), and the fluid contains charged particles, which are separated inside the separation chamber; two or more groups of electrodes (2), wherein the number of electrodes in each group of electrodes (2) is the same or different, each electrode (2) is in contact with the fluid and forms a pseudocapacitor and / or a double-layer capacitor on the interface where the electrode (2) is in contact with the fluid, the electrodes (2) are arranged in parallel inside the microfluidic channel (1), and there may be a certain angle between the arrangement direction of the electrodes (2) and the flowing direction of the fluid; a plurality of conductor leads (3); and two or more driving power sources (4), wherein each driving power source (4) is connected to one group of electrodes (2), the driving power sources (4) generate periodic voltages or current excitations, and voltage excitations or current excitations output by the driving power sources (4) within one output period are in a changing state.

The present invention proposes an improved method for the DC model of a liquid-gated graphene field-effect transistor, which includes three steps: improving the traditional GFET model by combining electrochemical theory, introducing the direction of the concentration parameter variable for further improvement, and finally verifying. By introducing the electric double-layer capacitance, the present invention accurately describes the electrode physical effect in the liquid gate, first corrects the DC model of the traditional GFET, overcomes its disadvantage of not being applicable to LG-GFET, and combines the principle of chemical reaction equilibrium to deduce the influence of the analyte concentration on graphene doping. The relationship between the analyte concentration and the carrier mobility is fitted using the relaxation time function, and finally a concentration-related DC model of LG-GFET is established, improving the application scope of the model. At the same time, by introducing the analyte concentration as an independent variable, the concentration of the analyte can be directly obtained using this model while detecting the electrical signal, improving the detection efficiency in the field of biological detection.

The present invention relates to the field of material science and technology, and specifically to a performance evaluation method and system for porous carbon materials for negative electrodes of lithium-ion batteries. By measuring physical performance indicators such as specific surface area, total pore volume, average pore size and graphitization degree of porous carbon materials, using electrochemical impedance spectroscopy to test electrochemical performance indicators such as ohmic resistance, charge transfer resistance, double layer capacitance and diffusion coefficient of porous carbon materials, constructing a two-dimensional matrix of physical performance and electrochemical performance to analyze the correlation, and drawing a radar chart of physicochemical performance to evaluate the comprehensive performance, a comprehensive, efficient and visual performance evaluation method is provided for the application of porous carbon materials in negative electrodes of lithium-ion batteries.

The invention discloses a VO (OH) 2 / g-C3N4 nano composite material for a supercapacitor and a preparation method of the VO (OH) 2 / g-C3N4 nano composite material, and belongs to the technical field of nano composite material preparation. The preparation method comprises the following steps: firstly, preparing g-C3N4 by adopting a calcination method, adding PVP and anhydrous VOSO4 into deionized water, then adding a NaOH solution to adjust the pH value, then adding g-C3N4, uniformly mixing by adopting a magnetic stirrer, then carrying out ultrasonic dispersion, then pouring a mixed solution into a reaction kettle, setting the temperature to be 100 DEG C, and carrying out sealed storage for 48 hours; after the reaction is finished, naturally cooling to the room temperature, cleaning, drying and grinding a product to obtain VO (OH) 2 / g-C3N4 solid powder, wrapping g-C3N4 nanosheets with VO (OH) 2 nanoribbons, and stacking the g-C3N4 nanosheets together to form a staggered network. The VO (OH) 2 / g-C3N4 composite material has a unique low-resistance characteristic, and shows excellent electrochemical performance due to the synergistic effect of a double-layer capacitor and an embedded pseudo capacitor. The prepared nano composite material has good stability and reusability, the preparation process is simple, economical and efficient, and the nano composite material has good application prospects.

The invention relates to the technical field of capacitor energy storage, and particularly discloses a super capacitor energy storage system with high energy density, which comprises a super capacitor, the super capacitor adopts a double-layer capacitor and pseudocapacitor composite energy storage mechanism, and an electrode material of the super capacitor is switched between a double-layer capacitor reaction and a pseudocapacitor reaction; the charging and discharging control module is used for adjusting the current and the voltage of the super capacitor through the embedded controller and carrying out energy management; the energy management is combined with an MPPT algorithm and a DPC algorithm to carry out charging and discharging management; and the heat dissipation module is used for carrying out heat dissipation on the super capacitor. According to the system, by adopting a double-layer capacitor and pseudocapacitor composite energy storage mechanism, the energy storage and release performance of the supercapacitor is remarkably improved, intelligent management of charging and discharging of the supercapacitor is achieved by combining MPPT and DPC algorithms, and the energy conversion efficiency is improved; the heat dissipation module prevents the super capacitor from being overheated due to high-power discharge, and guarantees long-term stable operation of the system.

The invention relates to the technical field of electro-optical modulators, in particular to a double-layer capacitive load inclined T-type traveling wave electrode lithium niobate electro-optical modulator, which comprises a substrate, a buffer layer, a hybrid optical waveguide, an isolating layer and a metal electrode, and is characterized in that the hybrid optical waveguide comprises a rectangular Si waveguide and an LN waveguide; on the premise that the LN waveguide limits the optical mode field, the limiting effect of the hybrid optical waveguide on the optical mode field is enhanced by using the rectangular Si waveguide; the metal electrode is a double-layer capacitance load inclined T-type metal electrode, the absorption loss can be effectively reduced, the metal electrode acts on the upper part and the lower part at the same time on the photoelectric efficiency, the inclined section can increase the electric field borne by the waveguide, and the modulation efficiency is improved; the metal electrodes are periodically arranged along the Y axis of the hybrid optical waveguide; in order to reduce light absorption loss, an isolation layer is added between the upper layer of the metal electrode and the mixed optical waveguide. According to the electro-optical modulator, the half-wave voltage length product of 1.18 V * cm is realized under the light absorption loss of 0.21 dB / cm.