13 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 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.

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 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.