204 results about "Dual electrode" patented technology

The invention discloses a method for preparing an iron-nickel-molybdenum-based electrocatalyst through combination of electrodeposition and rapid Joule heat and application of the method. The method comprises the steps that S1, a porous nickel substrate is pretreated, and the pretreated porous nickel substrate is obtained; s2, obtaining a nickel salt solution, a molybdenum salt solution and a ferric salt solution; s3, obtaining a mixed solution; s4, putting the mixed solution serving as electrolyte into a dual-electrode electrolytic tank, carrying out electro-deposition treatment by taking the pretreated porous nickel substrate as a cathode and an inert electrode as an anode, and washing and drying to obtain a Fe-Ni-Mo-LDH precursor; and S5, carrying out Joule thermal pyrolysis treatment on the Fe-Ni-Mo-LDH precursor, so as to obtain the iron-nickel-molybdenum based electrocatalyst. The preparation method can effectively regulate and control the size structure of the catalyst, and is suitable for preparing iron-nickel-molybdenum-based electrocatalysts with different substrates and different sizes; and the electrocatalyst has the advantages of uniform and stable nanostructure and high loading capacity. Meanwhile, the preparation method is short in reaction time, high in heating efficiency, high in repeatability and suitable for industrial large-scale production.

The invention relates to a preparation technology of an electrochemical catalytic material, and aims to provide a method for preparing an electrode material through pulse electrodeposition and application of the electrode material in an oxygen evolution reaction. The method comprises the following steps: constructing a dual-electrode electrolysis system, and co-depositing transition metal ions and selenium ions on a working electrode by adopting a pulse electrodeposition method to form a catalyst layer containing transition metal and selenide; then the working electrode is used for building an electrochemical system, electrochemical activation treatment is conducted on the working electrode through cyclic voltammetry, a selenium phase is induced to fall off, porous metal oxide is formed by reconstructing the surface of a catalyst layer, and the electrode material for the water electrolysis oxygen evolution reaction is obtained. The selenium phase is induced to fall off through electrochemical activation to form a porous metal oxide structure, the specific surface area is remarkably increased, rich oxygen vacancies are formed, the electronic structure is optimized, more active sites are exposed, and the catalytic activity is improved; the method is easy to operate, high in parameter controllability, free of high-temperature and high-pressure equipment and suitable for large-scale production.

The invention relates to the technical field of power grid measurement, in particular to a miniaturized wireless self-powered alternating current electric field measurement method and system. Comprising the following steps: acquiring radio frequency energy in an electric field environment, and converting the radio frequency energy into direct current electric energy through a radio frequency energy acquisition system consisting of a microstrip antenna, a voltage doubling rectifying circuit and an energy management circuit; an alternating current electric field signal is collected through a differential dual-electrode sensor structure, and an electric field voltage signal is generated; amplifying the voltage signal through an instrument amplifier, and obtaining a digital signal of the electric field signal through an analog-to-digital conversion circuit; and processing and analyzing the alternating current electric field information according to the digital signal. By combining a radio frequency energy acquisition technology with a differential dual-electrode sensing structure, the electric field sensor has the performance characteristics of self energy supply, miniaturization, high precision, wide frequency response and low power consumption. The system can measure various types of electric field signals, including sine wave, triangular wave and square wave electric field signals, has a wide frequency range and a wide measuring range, and is excellent in linearity.

Disclosed are devices, systems and methods for in vivo monitoring of localized environment conditions within a patient user by measuring analytes, including glucose, oxygen, and / or other analytes. In some aspects, a sensor device includes a wafer-based substrate, at least one electrochemical sensor two-electrode contingent including a working electrode and a reference electrode on the substrate and configured to detect a target analyte in a body fluid when the sensor device is deployed within a subject's body, where the working electrode is functionalized by a chemical layer configured to facilitate a reaction involving the target analyte that produces an electrical signal; and an electronics unit in communication with the electrochemical sensor electrode contingent to transmit the electrical signal to an external processor.

The invention discloses a preparation method of a graphite phase carbon nitride / titanium dioxide photo-anode based on carbon dot modification. The preparation method comprises the following steps: firstly, preparing graphite-phase carbon nitride and a carbon dot diluent, adding the graphite-phase carbon nitride and the carbon dot diluent into a precursor solution of titanium dioxide, dispersing and fusing, and growing a composite photocatalyst on conductive glass through in-situ hydrothermal treatment to obtain the photo-anode. The optimal material ratio is analyzed through characterization means such as electrochemical test and ultraviolet diffuse reflection spectrum. The optimal reaction condition of the photo-anode is explored by constructing the double-electrode photocatalytic fuel cell.

The utility model discloses a continuous production device for single-walled carbon nanotubes. The continuous production device comprises a raw material feeding unit, a reaction unit, a cooling unit and a product collecting unit, the reaction unit comprises a plasma cracking furnace, a first cathode, a first anode, a second cathode and a second anode are arranged in the plasma cracking furnace, the first cathode and the first anode are connected to a first plasma power supply, and the second cathode and the second anode are connected to a second plasma power supply; according to the utility model, the double-electrode gun is adopted, so that higher power and higher temperature can be realized, and the dosage of a catalyst is small, so that the catalyst in the plasma cracking furnace can be fully evaporated without crucible evaporation; the proportion of the required carbon source is low, and the double-electrode gun can realize higher airflow velocity, so that amorphous carbon can be prevented from being generated; therefore, the device can be used for continuously producing the carbon nanotubes, the utilization rate of the catalyst and the raw materials can be improved, the obtained product is high in purity and stable in quality, and the device is suitable for industrial large-scale production.

The invention relates to the field of fused salt energy storage, and provides a fused salt energy storage system based on an electrochemical sensing technology, comprising: a fused salt energy storage module for storing and converting energy through a liquid-solid two-phase heat storage medium and a modular heat storage device; the electrochemical sensing module is used for collecting electrochemical parameters of the fused salt in real time through a dual-electrode system sensor; the data processing module is used for analyzing the corrosion product layer structure of the metal material in the molten salt based on the electrochemical impedance spectroscopy and calculating the ion diffusion rate, and calculating the corrosion rate in real time by combining the charge transfer resistance; and the intelligent control module is used for dynamically adjusting the rotating speed of the fused salt circulating pump and the steam heat exchange power according to the corrosion rate and triggering local isolation protection. Intelligent management of fused salt energy storage can be achieved, the efficiency and safety of fused salt energy storage are remarkably improved, remarkable advantages are shown in the aspects of improving energy efficiency, guaranteeing safe operation and reducing maintenance cost, and an efficient and stable solution is provided for the fields of new energy consumption, industrial waste heat utilization and the like.

The invention discloses a magnetic field auxiliary dry type electrochemical polishing device and method for the inner surface of a pipeline, and the device comprises a base which is provided with a double-sliding-block displacement table, and the double-sliding-block displacement table is provided with a lower sliding block and an upper sliding block; a motor clamp is arranged on the upper sliding block, a motor is arranged on the motor clamp, the motor is connected with an electrode clamp, and the electrode clamp clamps an electrode; a workpiece clamp is arranged on the lower sliding block, a workpiece is arranged on the workpiece clamp, a lower container is arranged below the workpiece, an annular magnet is arranged outside the workpiece in a surrounding mode, and an inner space formed by the workpiece and the lower container is filled with a solid medium. The electrode clamp is connected with the rotating end of the conductive slip ring, and the static end of the conductive slip ring is connected with the anode of the power supply through a wire. The magnetic field assists in regulating and controlling ion migration, dry type electrochemical polishing is achieved by combining the synergistic effect of the two electrodes, liquid electrolyte pollution is avoided, and the device has the advantages of being high in polishing uniformity, convenient and fast to operate and low in cost and is suitable for precise runner inner surface treatment of the additive manufacturing pipeline.

The invention belongs to the technical field of steel plate pickling, and relates to a method for carrying out pretreatment and pickling end point judgment on hot-rolled strip steel in hydrochloric acid. The method specifically comprises the following steps: taking a to-be-used hydrochloric acid liquid for testing, heating the hydrochloric acid liquid, adding a wetting reagent A and a potential stabilizing reagent B, and putting a to-be-measured hot-rolled strip steel into the hydrochloric acid liquid; and measuring the pickling process of the hot-rolled strip steel by adopting a dual-electrode detection system and a constant potential rectifier, synchronously recording electrode potential values in different time periods in the process, and taking a time point when a potential first-order derivative value is basically unchanged as the pickling end point time of the hot-rolled strip steel. According to the method, the implementation process is simple, only certain manpower needs to be input for manual operation, and analysis instruments related to related work are mature; the method can effectively measure the pickling end point of the hot-rolled strip steel, especially the ultra-high-strength hot-rolled steel plate in the acid liquor, eliminates the effects of various influence factors in pickling, and has extremely high practical application value.

The invention discloses a dual-electrode-based high-sensitivity differential pressure ceramic capacitive sensor and a measurement method thereof, and belongs to the technical field of pressure sensors. The sensor comprises a ceramic substrate, a dual-electrode structure, a differential pressure sensitive diaphragm and a signal processing module. The two electrodes are symmetrically distributed on the two sides of the diaphragm, when the diaphragm is subjected to the differential pressure effect on the two sides, capacitance changes reversely, high-sensitivity detection of the differential pressure is achieved through a differential calculation formula, and the sensitivity is improved by two times compared with a single electrode. And the ceramic plate integrates an overvoltage protection function, so that the diaphragm is prevented from over-limit deformation. The design solves the problems that a traditional sensor is low in sensitivity and weak in interference resistance in tiny differential pressure detection, and can be widely applied to the fields of industrial pressure monitoring, automobile differential pressure control, new energy battery thermal management and the like. And the reliability and the precision are remarkably improved by a dual-electrode differential structure and an overvoltage protection mechanism, and an innovative scheme is provided for the design of a high-cost-performance capacitor core body.

Systems and methods that utilize a separator coated by particles for Li dendrite detection in an ordinary two-electrode battery system. The particles can be red phosphorus (RP) particles and / or other particles that are poor electronic conductors, are able to react with Li, and will form an insoluble product with Li, such as silicon, germanium, arsenic, metal oxides, metal halides, metal chalcogenides, chalcogenides, and LiMxEyOz (M=metal, E=nonmetal, O=oxygen, x≥0, y≥0, z≥0). These other particles can be used by themselves or in combination with one another. No additional electrode is needed, and the presence of Li dendrites can be detected simply based on the voltage profile during the charging step.

To provide a front zone double electrode unequal interval kiln and its operation method capable of highly efficient melting under a large flow rate.SOLUTION: A kiln includes a pool wall 1, the pool wall 1 forms a fining zone 8, a homogenizing zone 7 and a plurality of pre-smelting zones 6, the pre-smelting zone 6 is in communication with the homogenizing zone 7, the homogenizing zone 7 is in communication with the fining zone 8, an entire width of the pre-smelting zone 6 is greater than widths of the fining zone 8 and the homogenizing zone 7, a plurality of electrodes 2 are disposed on the pool wall 1 on two sides of each of the fining zone 8, the homogenizing zone 7 and the pre-smelting zone 6, and an interval between the electrodes on two sides of the pre-smelting zone 6 is less than an interval between the electrodes on two sides of the fining zone 8 and the homogenizing zone 7, so as to improve operation stability of an electrode electrification process of the kiln, and reduce occurrence of a "power failure" phenomenon.SELECTED DRAWING: Figure 1

The invention belongs to the field of electric arc furnaces in the metallurgical industry, and particularly relates to the field of electric arc furnace power supply, in particular to a double-electrode alternating-current electric arc furnace capable of achieving frequency-variable smelting operation. A TV1 high-voltage voltage transformer, an electric arc furnace circuit breaker and a CT1 high-voltage current transformer are connected to an inlet wire bus section; the system further comprises a phase-shifting N transformer and an alternating current-direct current-alternating current converter, a primary side winding of the phase-shifting N transformer is connected with the output end of the electric arc furnace circuit breaker, a secondary side of the phase-shifting N transformer is connected with the input end of the alternating current-direct current-alternating current converter, and a TV2 low-voltage voltage transformer and a CT2 low-voltage current transformer are arranged on the wire outlet side of the output end of the alternating current-direct current-alternating current converter. And the output end of the AC-DC-AC converter is connected with the outlet copper pipe, the flexible water-cooled cable and the copper-steel composite conductive cross arm through a large-current line, so that electric energy is transmitted to the dual-electrode graphite electrode. According to the invention, the smelting charging power is improved, the smelting power consumption is reduced, and the smelting efficiency is improved.

The invention provides a surgical electrode and a using method thereof, and relates to the technical field of medical instruments. Two electrode accommodating holes are formed in the fixed sleeve body, a telescopic electrode stem and a rotating electrode stem are respectively arranged in the two electrode accommodating holes, and a bending part is arranged at the end part of the rotating electrode stem; an electrode control circuit board is arranged in the containing cavity and electrically connected with the telescopic electrode rod and the rotary electrode rod. The surgical electrode has the beneficial effects that the telescopic assembly is arranged in the inner shell of the surgical electrode and can control the telescopic electrode rod to stretch out and draw back, so that the surgical electrode can execute single-electrode and double-electrode functions and has multiple functions, and the problem that an existing surgical electrode is single in function is solved; and in the switching process of the single-electrode working state and the double-electrode working state of the operation electrode, the tool bit does not need to be replaced. And in the dual-electrode mode, the distance between the electrodes is adjustable, so that the surgical electrode can adapt to the widths of different surgical wounds, the adaptability of the surgical electrode is improved, and the surgical effect is further improved.

A dual electrode DC electric arc melter 10 for a conductive material 12 comprises a vessel 14 for holding the material. The vessel comprises a sidewall 16, a roof 18 and a bottom 20 and defines a taphole 22 for molten metal. A tilting mechanism 24 enables selective tilting of the vessel to tap the molten metal from the vessel. First 26 and second 28 electrodes, in a normal operative position, extend through the roof into the vessel. An electrode manipulating arrangement 30 is configured to move the electrodes between the normal operative position and a position away from the vessel. A DC power system 32 drives via a DC output the first electrode as a cathode and the second electrode as an anode. An arc deflection compensation circuit 50 is provided for reducing deflection towards the sidewall of arcs extending from the first and second electrodes.

The invention discloses a double-flow slab tundish with a double-electrode plasma heating function. The double-flow slab tundish comprises a tundish body and a tundish cover arranged at the top of the tundish body, and a turbulence controller is arranged at the bottom of the tundish body; a barrage structure is arranged at one end of the interior of the tundish, and a uniflow control wall structure is arranged at the other end of the interior of the tundish. And a dual-electrode plasma heating device is arranged on the ladle cover. Single-flow pouring of the double-flow tundish is achieved, the size of a low-temperature area and the size of a dead area are reduced, slag entrapment is prevented, the temperature in the tundish is uniform, and the plasma heating efficiency is improved. And meanwhile, the tundish casting allowance is reduced.

The invention relates to the technical field of humidity sensors, and discloses a visual humidity sensor based on alternating-current electroluminescence, which comprises a base layer and a humidity-sensitive luminescent layer, a coplanar dual-electrode layer is arranged between the base layer and the humidity-sensitive luminescent layer, the humidity-sensitive luminescent layer is coated on the surface of the coplanar dual-electrode layer, and the humidity-sensitive luminescent layer is coated on the surface of the coplanar dual-electrode layer. Two electrodes of the coplanar dual-electrode layer are located on the same plane and are closely adjacent, the thickness of the two electrodes of the coplanar dual-electrode layer is 20 nm to 20 [mu] m, and the two electrodes of the coplanar dual-electrode layer are made of any one or a combination of more of metal, transparent conductive oxide, a nano conductive material, ionic conductive gel and a conductive polymer material; according to the humidity sensor, humidity sensing is achieved through luminous intensity changes caused by capacitance and impedance changes before and after moisture absorption, the luminous intensity changes before and after moisture absorption, and the luminous brightness is reduced along with increase of humidity.

The invention discloses a double-excitation double-electrode electromagnetic flowmeter for high-frequency pulsating fluid measurement. The double-excitation double-electrode electromagnetic flowmeter comprises a pipe body structure and a control circuit. The pipe body structure comprises a lining and a guide pipe; the inner side face of the guide pipe is covered with a lining. A first group and a second group of electrodes are arranged in the conduit; a first group and a second group of coils are arranged at corresponding positions of the first group and the second group of electrodes in the inner cavity of the catheter; first and second magnetic field shielding covers sleeve the circumferential outer side of the conduit; the first and second groups of coils are respectively positioned inside the first and second magnetic field shielding covers; an annular grounding electrode is arranged between the first group of electrodes and the second group of electrodes; the annular grounding electrode is connected to the conduit through the grounding fastening electrode; the control circuit comprises a CPU module; the CPU module generates complementary periodic excitation waveforms to excite the coil, controls acquisition of electrode signals and is used for calculating flow data of fluid in the conduit. According to the invention, high-fidelity and continuous measurement of the flow of the high-frequency pulsating fluid can be realized, and the measurement precision is ensured.

To provide a highly efficient narrow groove two-electrode large heat input submerged arc welding method which can obtain a sound weld part having no high-temperature cracking and weld defects, prevents generation of a pop mark and a projection, and can obtain excellent welding workability and excellent mechanical properties of weld metal.SOLUTION: A narrow groove two-electrode large heat input submerged arc welding method of single pass per layer brings a backing material into contact with a rear face of a narrow groove having plate thickness of 60 mm or more, a chevron type or a V shape, a groove angle of 16 to 20°, and a root gap of 4 to 10 mm, and then performs submerged arc welding of single pass per layer so that the total of heat inputs of a preceding electrode and a succeeding electrode for each path is 200 to 490 kJ / cm, using a sintered type flux containing the total of SiO2 and CaO conversion values and the total of MgO of 30 to 40%, 4 to 10% TiO2, 16 to 26% Al2O3, 1 to 5% ZrO2, the total of CaF2, B2O3, Si and Al of 1.5 to 5.5%, the total of an Li2O conversion value of 0.5 to 2.0%, 15 to 25% Fe, and the total of Mn, Ni and Mo of 3.5 to 7.5%.SELECTED DRAWING: Figure 1

This invention relates to a g-C3N4@NiS composite photoelectrocatalyst and its preparation and application. The catalyst has a flower-like hierarchical porous structure, composed of g-C3N4 nanospheres and NiS nanoparticles supported thereon. The g-C3N4 nanospheres are assembled from stacked nanosheet layers. The NiS nanoparticles and g-C3N4 nanospheres form an in-situ covalently bonded heterojunction through Ni-S and Ni-N bonds, constructing a p-n heterostructure. The preparation method involves mixing melamine, glucose, CTAC, nickel acetate, and thiourea, and simultaneously achieving the condensation polymerization of g-C3N4 and the growth of NiS using a low-temperature one-pot hydrothermal method. Under alkaline conditions, the HER overpotential of this catalyst is only -2 mV at 10 mA cm⁻¹. ‑2 The overpotential of OER is 270 mV at 10 mA cm⁻¹. ‑2 In the dual-electrode total water splitting system, only 2.4 V is required to achieve 20 mA cm⁻¹. ‑2 It achieves a high current density and operates stably for over 24 hours, exhibiting excellent catalytic activity and stability in seawater. This invention boasts advantages such as a simple synthesis process, strong interfacial coupling, superior catalytic performance, and resistance to seawater corrosion.

This invention relates to a bipolar plate assembly for a PEM electrolyzer and its manufacturing process. The PEM electrolyzer bipolar plate assembly includes: a bipolar plate; the bipolar plate includes a metal electrode plate and a first sealing ring; the metal electrode plate is provided with a flow channel, a first annular sealing groove, an oxygen inlet, a water inlet, and a hydrogen inlet; the first sealing ring is adapted to the shape and size of the first annular sealing groove and is integrally vulcanized with the metal electrode plate; two titanium felts and two titanium meshes; the bipolar plate, two titanium felts, and two titanium meshes are sintered into a single assembly, and the arrangement from top to bottom is: titanium felt - titanium mesh - bipolar plate - titanium mesh - titanium felt. This invention improves the flatness of the titanium felt / mesh surface and the accuracy of positioning during assembly by sintering the titanium mesh, titanium felt, and bipolar plate together, thereby improving assembly quality and production efficiency, while also reducing energy consumption during water electrolysis.

The invention belongs to the technical field of oil-water separation, and provides an oil-water separation membrane for oilfield fracturing flow-back fluid and a preparation method of the oil-water separation membrane. The preparation method comprises the following steps: by taking a red copper plate as an anode and a copper mesh as a cathode, carrying out electrochemical deposition in an electrolyte solution by adopting a dual-electrode system to obtain the copper mesh with deposited copper particles; soaking the copper mesh deposited with the copper particles in an alkaline oxidation solution to obtain an oil-water separation membrane; the alkaline oxidation solution is a mixed solution of NaOH, (NH4) 2S2O8 and water. The preparation method is simple, convenient and efficient, the small-size milky oil-water separation membrane is rapidly prepared through an electrochemical deposition and alkali-assisted oxidation two-step method, and the small-size milky oil-water separation membrane has excellent oil-water separation efficiency, high permeation flux and excellent stability.

The invention discloses an echelon utilization lithium ion battery pack capable of losslessly replacing internal batteries. The echelon utilization lithium ion battery pack comprises a battery pack shell, a top cover, a battery limiting plate, a first electric connecting plate, a second electric connecting plate and an air duct structure, the battery limiting plates sleeve the single battery cells and are bonded with the inner wall of the shell through heat-conducting glue to limit the horizontal displacement of the battery cells; the first electric connecting plate and the second electric connecting plate are respectively propped against two ends of the battery cell and are matched with two types of battery cells, namely single-end single-electrode and single-end double-electrode; air ducts are arranged on the top cover and the bottom plate of the shell and matched with ventilation holes of the electric connecting plate and the limiting plate, and forced convection heat dissipation is achieved under the action of the exhaust device. According to the invention, the failed battery cell can be replaced without damage, the echelon utilization value is improved, the battery cell is compatible with various types, the heat dissipation is efficient, and the adaptability is strong.

The invention discloses a nerve monitoring condensable and cuttable electrode and an electrocoagulation operation system. The nerve monitoring condensable and cuttable electrode comprises a handle shell, a condensable and cuttable high-frequency operation electrode assembly, a nerve detection electrode assembly and a driving control mechanism, wherein the condensable and cuttable high-frequency operation electrode assembly and the nerve detection electrode assembly are arranged in the handle shell. The driving control mechanism comprises an external operation part and an internal transmission assembly, and the external operation part is in transmission connection with the two electrode assemblies through the internal transmission assembly. When the external operating part moves towards a first direction, the high-frequency operation electrode assembly is driven to extend out and the nerve detection electrode assembly is synchronously driven to retract; otherwise, the nerve detection electrode assembly is driven to stretch out, and the high-frequency operation electrode assembly is synchronously driven to retract. Reverse linkage and physical mutual exclusion of the two electrodes are achieved through the internal transmission assembly, it is ensured that only one functional head is located at the working position at the same time, and the risk that due to the fact that the two electrodes stretch out at the same time, mutual interference of different energies and accidental touch of non-target tissue are possibly caused in the operation process is avoided.

A two-electrode submerged arc welding method capable of improving the quality of welded joints is provided. [Solution] A two-electrode submerged arc welding method includes distributing a cut wire within a groove of a base material (2), outputting current from a power source via a leading electrode (3) to energize a leading welding wire (4) and generating an arc (A) between the base material (2) and the leading welding wire (4) within the groove, and energizing a trailing electrode (6) from the power source to supply a heated filler wire (7) to a molten pool (P) formed behind the arc (A) while welding is proceeding, without generating an arc, wherein the leading electrode (3) is inclined toward the welding direction (X) at a predetermined sweepback angle (θ) with respect to an axis (Z) perpendicular to the welding direction (X) and the base material (2).

Systems and methods for charging protocols for secondary batteries are provided including: measuring an open-circuit voltage (Vref) according to a state-of-charge (SOCx) for a two-electrode cell, charged with a reference current; measuring second open-circuit voltages (Vc) according to the state-of-charge when charging the cell with a plurality of different charging currents; calculating an internal resistance value (RSOCx) according to the state-of-charge using an equation (RSOCx)=(Vc−Vref) / Ic for the different charging currents, wherein Ic is a value for the different charging currents, and computing a charging current-specific internal resistance profile mapping the internal resistance value according to the state-of-charge for the different charging currents; and identifying, for the charging current-specific internal resistance profiles, each inflection point, determining a lowest resistance value among the inflection points as a reference value, and determining, for the computed charging current-specific internal resistance profiles, the state-of-charge having the reference value as a limit state-of-charge.

The invention belongs to the technical field of uric acid detection, and relates to a preparation method and application of a uric acid and pH dual-electrode detection sensor. The preparation method comprises the following steps: mixing a soluble manganese salt with a complexing agent, adding a soluble hexacyanoferrate solution, aging and standing at room temperature, centrifuging, drying, and pyrolyzing at high temperature to obtain the Mn2O3 / Fe2O3 material. Coating on the surface of a first working electrode, and then continuously dropwise adding a mixed solution containing a cross-linking agent and urate oxidase; and uniformly mixing a chloroauric acid solution with a hydrochloric acid solution and an aniline solution with a hydrochloric acid solution, carrying out electro-deposition on a second working electrode, and drying at low temperature to obtain the sensor. The sensor designed based on the double working electrodes shows excellent stability, reproducibility and anti-interference performance in sweat uric acid monitoring. The sensor can realize rapid identification and dynamic response of uric acid in a real sweat sample, and is expected to be used for integration of wearable equipment to realize continuous gout early warning.

The invention relates to the field of wastewater treatment, and discloses a biological treatment process for sodium hydrosulfide production high-sulfur wastewater, which comprises the following steps: S1, culturing and activating active bacteria; s2, pretreating high-sulfur wastewater generated in the production process of sodium hydrosulfide; s3, introducing the wastewater into a multi-stage microbial battery reaction system; s4, dynamically regulating and controlling a microbial metabolism path in the multi-stage reaction system by arranging an intelligent bio-membrane reactor; s5, passing through a dual-electrode system and a tail end filtering device of a by-product control system; and S6, recovering electric energy generated in the microbial battery reaction system through an energy recovery system. Through a multi-stage microbial battery series connection structure, a continuous reaction path from high-concentration degradation to terminal deep purification is formed, the technical effects of keeping stable reaction efficiency and low residual rate under the condition of treating sulfides with different concentrations are achieved, and the problems that degradation capability is easy to attenuate and tail water fluctuates severely in a later treatment stage are solved.

The invention relates to the technical field of energy storage and conversion, in particular to a three-electrode type zinc-organic matter integrated air battery which is formed by assembling a charging cathode, a discharging cathode and an anode. The charging cathode and the discharging cathode are respectively composed of a current collector and an electrooxidation catalyst or an oxygen reduction catalyst; the battery is characterized in that a reduction mechanism of oxygen in air and an electrooxidation reaction of organic matters are integrated in one device; during discharging, oxygen reduction reaction is carried out on the discharging cathode to generate hydroxyl, and anode Zn is oxidized into ZnO; during charging, an oxidation reaction of organic matters occurs on the charging cathode to generate acid, and ZnO is reduced into Zn on the anode; compared with a conventional dual-electrode zinc-air battery, the air battery has the following advantages: (1) the charging voltage of the battery is reduced, and the charging / discharging energy conversion efficiency of the battery is improved; (2) the oxygen reduction catalyst is effectively prevented from being inactivated due to excessive oxidation during charging; and (3) electric energy output and green synthesis of high-value chemicals can be realized at the same time.

The invention discloses a flexible bioelectric surface dry electrode based on a magnetic tunnel junction and a preparation method of the flexible bioelectric surface dry electrode. The flexible bioelectric body surface dry electrode comprises a flexible substrate, and a bottom electrode lead, an insulating layer, a discrete conductive island array, an MTJ spinning electron functional layer, a microneedle biological contact layer, an interface leveling insulating layer, a confluence top electrode and a top electrode lead which are arranged in sequence. A conductive island array and top-bottom dual-electrode collaborative design is adopted: a conductive island focuses a weak bioelectric signal on a body surface, so that the weak bioelectric signal vertically passes through an MTJ functional layer, magnetic moment deflection is driven by an Oersted field excited by a bioelectric current, and in-situ amplification of the signal is realized by using an MTJ tunneling magnetoresistance effect. In combination with the low-impedance contact characteristic of the microneedle, the electrode effectively reduces motion artifacts, breaks through the bottlenecks of signal attenuation and dependence on an external amplification circuit of a traditional dry electrode, has high sensitivity, high signal-to-noise ratio and wearing comfort, and is suitable for the fields of electroencephalogram and electrocardio acquisition and wearable health monitoring.