528 results about "Active particles" patented technology

The invention relates to the technical field of energy storage, in particular to a secondary battery and a preparation method thereof, a battery pack, an energy storage system and electric equipment. The secondary battery comprises a positive electrode active particle, the positive electrode active particle comprises an inner core and a carbon layer coating the inner core, and the inner core comprises one or more of lithium transition metal phosphate and lithium transition metal oxide; part of the positive electrode active particles are cracked, the width of the cracked crack is 10 nm to 30 nm, and the length of the cracked crack is 300 nm to 800 nm. The secondary battery provided by the invention has good cycle performance while the discharge gram capacity is improved, and is beneficial to wide application in the field of energy storage.

According to the plasma aquaculture water purification method and system, a cold plasma directional screening technology is used as a core to construct a cold plasma water treatment module, a nanosecond pulse plasma generator is used for exciting a gas medium to form cold plasma, active particles are screened in situ through a directional screening assembly, and the cold plasma water treatment module is used for purifying aquaculture water. The method comprises the following steps: introducing ammonia nitrogen into a water body, guiding < 1 > O2 to be quickly injected into the water body, instantaneously completing a primary purification reaction in a gas-liquid intersection chamber, further, in order to fully utilize residual active particles, directionally converting a reaction precursor O3 of < 1 > O2 into < 1 > O2 through a catalytic dissociation module, and completing a secondary purification reaction between the < 1 > O2 and the ammonia nitrogen. Ammonia nitrogen is directionally converted into nitrogen by utilizing a 1O2-dominated non-free radical reaction path, the content of ammonia nitrogen and total inorganic nitrogen in a water body is reduced, and after purification is completed, oxidizing components in the water body and tail gas are respectively removed by adopting a by-product removal assembly, so that the use safety is guaranteed.

The invention belongs to the technical field of medical treatment, and discloses a blood product virus inactivation system based on a synergistic effect of nano-catalysis photochemical inactivation and low-temperature plasma, the system comprises: a nano-photocatalysis inactivation module adopting titanium dioxide TiO2 and graphite phase carbon nitride g-C3N4 nano-materials as photocatalysts; the low-temperature plasma inactivation module adopts a low-temperature plasma generator to generate plasma cloud above the blood product and release active particles; the dynamic fluid stirring module is used for enabling the blood product to uniformly receive photocatalysis and plasma inactivation effects through a microfluid mixing technology so as to ensure the uniformity of virus inactivation; the sensing monitoring and intelligent feedback module is used for monitoring the residual quantity of viral nucleic acid and the activity of protein in the blood in real time by adopting a spectrum sensor and a biochemical sensor. The method can be widely applied to the fields of clinical blood transfusion, blood product manufacturing, blood disease treatment and the like, promotes the progress of a blood safety guarantee technology, reduces the virus infection risk and improves the patient safety.

The invention relates to a multi-active particle size gradient multilayer dry-method thick electrode and a preparation method thereof, the structure of the dry-method thick electrode comprises a current collector, the current collector is provided with a first surface and a second surface which are oppositely arranged along the thickness direction, the first surface and the second surface are sequentially provided with a plurality of layers of dry-method electrode diaphragms from inside to outside, and the dry-method electrode diaphragms are arranged on the first surface and the second surface. The particle sizes of active substances in each layer of diaphragm of the multi-layer dry-method electrode diaphragm are different; the preparation method has the advantages that the electron / ion conductivity of the pole piece is improved, and the rate capability of the pole piece can also be improved.

The invention relates to the technical field of intelligent fire extinguishing control of energy storage power stations, in particular to a method and system for plasma protection of thermal runaway of an air-cooled energy storage power station. The method comprises the following steps: processing real-time data acquired by a multi-source sensor through a dynamic risk assessment model to obtain a risk level and an early warning level; an initial control instruction for the plasma generator and the air cooling and refrigerating system is formed according to the risk level and the early warning level; the initial control instruction is processed to form a driving control signal; a control signal is subjected to cooperative execution processing to obtain a high-energy active particle jet flow, a forced airflow and a refrigeration effect. The system comprises an air cooling box body, a battery, a fan, a plasma generator, an ejector, an intelligent controller, a compressor, a gas-liquid separator, a heat exchanger, an electronic expansion valve, a drying filter, a gas sensor and a pressure sensor valve. The safety and reliability of the energy storage power station are improved.

The invention relates to the technical field of batteries, and discloses a roll core and a battery. The roll core comprises a positive plate, a negative plate and a diaphragm, a groove is formed in a positive active layer of the positive plate, and the groove is at least formed in an arc section, closest to the winding center, of the positive plate, so that the thickness of at least partial region on the arc section of the positive plate is reduced, and the risk that active particles on the positive plate pierce the diaphragm is reduced; according to the present invention, by limiting the ratio p1 / H1 between the thickness p1 of the functional layer of the diaphragm and the depth H1 of the groove to be in the range of 0.02-2, the p1 is in the range of 0.3-10 [mu] m, and the H1 is in the range of 3-40 [mu] m, such that the battery can be reduced to the preset charging cut-off current during the charging process, and the self-discharge rate of the battery can be reduced. And on the basis that the battery can reach a fully-charged state, the liquid retention capacity of the battery can be improved, the cycle performance of the battery is improved, and the battery is ensured to have relatively high volume energy density.

The invention belongs to the field of carbon dioxide adsorbents, and particularly relates to a carbon dioxide adsorbent, a preparation method and application thereof. The disclosed carbon dioxide adsorbent comprises: active particles of a core-shell structure; the core body of the active particle comprises at least one of CaO or MgO; a shell of the active particles comprises at least one of Ca (OH) 2 or Mg (OH) 2. The carbon dioxide adsorbent provided by the invention has a core-shell structure, the shells of the active particles can capture CO2 at room temperature to about 300 DEG C, and the cores of the active particles can capture CO2 at 300 DEG C to 700 DEG C, so that the carbon dioxide adsorbent has CO2 capture performance in a wide temperature range.

The invention relates to the field of new energy, in particular to a sodium-ion battery positive active material, a preparation method thereof and a sodium-ion battery. The sodium ion battery positive electrode active material is composed of active particles, and each active particle comprises a core layer, and a transition layer, a wrapping layer and a carbon layer which sequentially wrap the outer side of the core layer. The core layer, the transition layer and the wrapping layer all take sodium ferric phosphate pyrophosphate doped and modified salt as a main component, a first doping element and a manganese element of which the common valence state is higher than or equal to + 3 are doped in the core layer, the transition layer is doped with the manganese element, the wrapping layer is doped with an electrochemically inert second doping element, and the doping amounts of the three layers of structures are gradually reduced from inside to outside. The main component of the carbon layer is carbon element. The content of manganese in the active particles is in a gradient decreasing distribution rule, so that the long-range order of manganese in the active material is destroyed, the Jahn-Teller synergistic effect and manganese dissolution are inhibited, and the structural stability of the material is improved.

The invention relates to the technical field of solid-state batteries, and further relates to a solid-state battery material, a positive electrode active material layer, a positive electrode membrane, a solid electrolyte membrane, a solid-state battery, an electric device and application. The solid-state battery material comprises a coated particle, the coated particle comprises a particle body and an oxygen storage layer located on at least one part of the surface of the particle body, and the oxygen storage layer comprises an oxygen storage material; wherein the coating particles are at least one of coating positive electrode active particles and coating electrolyte particles; when the coating particles are coating positive electrode active particles, the particle body is a positive electrode active body, and the positive electrode active body comprises a positive electrode active material; when the coated particles are coated electrolyte particles, the particle bodies are solid electrolyte bodies, and the solid electrolyte bodies comprise sulfide electrolyte. When the solid-state battery material is used as a preparation raw material, the discharge capacity and the cycle performance of a sulfide solid-state battery can be improved.

The present disclosure related to a method of using high frequency sound waves directed toward an acoustically active particle. The high frequency sound waves may be configured to enlarge the acoustically active particle and oscillate the acoustically active particle, thereby facilitating extravasation of an agent to a tissue compartment of a region of interest.

This invention is related to the field of biosensors. In particular, devices and methods are described which enable the quantification of biomolecules by virtue of particle speed driven by induced-charge electrophoresis. For example, a range of biomolecules can be simultaneously detected in a highly sensitive manner from a library (e.g., combination) of active particles having different shapes or fluorescent signatures. Such biomolecules are related to conditions including, but not limited to, cancer biomarkers, viral infection biomarkers, toxins, pesticides, and small molecule drugs.

The invention relates to the technical field of energy storage, in particular to a secondary battery and a preparation method thereof, a battery pack, an energy storage system and electric equipment. The secondary battery comprises a positive electrode active particle, the positive electrode active particle comprises an inner core and a carbon layer coating the inner core, and the inner core comprises one or more of lithium transition metal phosphate and lithium transition metal oxide; part of the positive electrode active particles are cracked, the width of the cracked crack is 10 nm to 30 nm, and the length of the cracked crack is 300 nm to 800 nm. The secondary battery provided by the invention has good cycle performance while the discharge gram capacity is improved, and is beneficial to wide application in the field of energy storage.

The invention relates to the technical field of plasma equipment, in particular to a plasma reactor, a plasma activated water preparation device and a plasma activated water preparation method, and the plasma activated water preparation device comprises a dielectric barrier discharge unit and a pulse discharge unit. The pulse discharge unit is arranged above the dielectric barrier discharge unit, and a mixed fluid inlet is formed in the bottom of the dielectric barrier discharge unit. And the top of the pulse discharge area is provided with a mixed fluid outlet. One is that discharge of the dielectric barrier discharge unit and pulse discharge of the pulse discharge unit are utilized to respectively provide a large amount of active oxygen and active nitrogen, and two discharge units are integrated in one plasma reactor to realize mutual dissolution promotion of the active oxygen and the active nitrogen; secondly, the multiple stages of plasma reactors are connected in series, the stages are increased according to the water demand, the plasma dosage is ensured, and plasma activated water is prepared in a non-circular circulation mode; and thirdly, the mixing time of the gas-liquid mixed fluid in the preparation device of the plasma activated water is long, so that the waste of the active particles can be prevented.

The invention discloses a preparation method and application of an oil-soluble heteropolyacid ionic liquid catalyst. The catalyst is composed of organic cations and inorganic anions, the cations are one of quaternary ammonium, imidazole and pyridine cations containing long-chain alkyl, the anions are heteropolyacid anions, the long-chain alkyl enables the catalyst to have good oil solubility, the catalyst can be efficiently dispersed in the waste grease, heteropolyacid provides active sites, and the catalyst can be used for treating the waste grease. Nano-scale active particles are formed after in-situ vulcanization, and the catalytic hydrogenation effect is achieved. The invention also provides a preparation method of the oil-soluble heteropolyacid ionic liquid catalyst, the catalyst can be prepared from tertiary amine and halogenated hydrocarbon through three-step reaction of alkylation, anion exchange and acid-base neutralization, the preparation process is simple, a highly toxic reagent is avoided, and the cost is low. The catalyst provided by the invention can be used for catalytic hydroisomerization of various waste oils and fats, has the characteristics of high conversion rate, low coking rate and high product calorific value, and has relatively high industrial application potential.

The invention discloses a low-temperature plasma-based portable joint inflammation accurate therapeutic apparatus, and relates to the technical field of arthritis treatment, the low-temperature plasma-based portable joint inflammation accurate therapeutic apparatus comprises a shell, the lower end of the shell is fixedly connected with a first magnetic type interface, the interior of the shell is fixedly connected with a graphene heat-conducting fin, the front end of the graphene heat-conducting fin is fixedly connected with a circuit board, and the circuit board is fixedly connected with a power supply. A plasma generator, a battery, an ozone neutralization module, a communication module and a control chip are fixedly installed at the front end of the circuit board, through a magnetic attraction structure of the first magnetic attraction type interface and the second magnetic attraction type interface, in cooperation with mechanical positioning of the positioning block and the butt joint groove, rapid replacement of the treatment probe is achieved, and by replacing probes of different forms, the treatment efficiency is improved. The probe can adapt to complex joint contours, a miniature ultrasonic transducer is integrated in the probe, tissue gaps can be temporarily expanded by means of the cavitation effect of ultrasonic waves, the penetration depth of plasma active particles is increased, and the probe effectively acts on deep synovial tissues.

The invention relates to an antibacterial and deodorant particle which comprises an active particle and a hydrophilic film wrapping the outer surface of the active particle. The active particles comprise the following raw material components in parts by weight: 15-20 parts of SEBS, 8-15 parts of silicon dioxide, 10-20 parts of sepiolite powder, 6-16 parts of an antibacterial agent, 2-5 parts of sodium stearate, 2-5 parts of sodium citrate, 5-10 parts of beta-cyclodextrin, 18-27 parts of an adhesive and 1-3 parts of an odor neutralizer; the hydrophilic film is formed by forming a hydrophilic material. According to the antibacterial and deodorant particles, SEBS serves as a hydrophobic elastic framework of active particles, and free diffusion of active ingredients in the particles is limited through hydrophobic entanglement of molecular chains; meanwhile, a hydrophilic material is used as an outer coating film, and the release rate of the active components is controlled by adjusting the interface action of the active particles and sewage, so that the antibacterial and adsorption deodorization active components in the antibacterial and deodorization particles are stably and slowly released; it is ensured that the efficient and long-acting antibacterial and deodorizing effect can be achieved for 14 days in complex water environments such as domestic sewage treatment.

According to the low-temperature plasma activated water preparation system, the preparation method and the application, a direct-current voltage-driven air jet plasma generation device which is small and convenient and does not need a complex gas circuit is utilized in the preparation system, and air is adopted as working gas to treat an aqueous solution; an aqueous solution rich in active oxygen, active nitrogen and other active ingredients is efficiently generated, and the active ingredients have high oxidation-reduction potential and can effectively degrade PhSMe. The concentration of active particles in PAW is improved by optimizing the discharge voltage, the discharge time and the concentration of the sodium molybdate solution, so that the degradation effect of PhSMe is improved. An auxiliary agent sodium molybdate is introduced in the degradation process, and the degradation effect is two times higher than the pure PAW treatment effect.

The invention discloses an electric flame stove capable of eliminating ozone. The electric flame stove comprises a stove body, a magnetic energy box mounted at the upper end of the stove body and a burner mounted in the stove body, and a magnetron is arranged at the microwave emission port in the magnetic energy box. The high-frequency electromagnetic wave is adopted to excite the initial plasma, so that the temperature and efficiency of the electric flame are improved, and the high-temperature cooking requirements such as stir-frying in a kitchen are met; the reaction between active particles (oxygen ions O or oxygen atoms O) in plasma and ozone is accelerated by adopting high-frequency electromagnetic waves, and finally ozone molecules are decomposed and reduced, so that ozone overflow is inhibited; in a non-pot state, the density of the plasma in the double hearths is small, the microwave switch is switched off, the magnetron stops working, and microwave leakage is completely eradicated from the source; the cooling tank is annularly distributed on the side wall of the second hearth to form a continuous gas barrier surrounding the second hearth, so that the magnetron and the side wall of the second hearth are prevented from being influenced by ultrahigh temperature.

The invention discloses a wood-plastic lightweight porous copper foil, a preparation method thereof and an application of the wood-plastic lightweight porous copper foil in a secondary battery. Firstly, lignin and cellulose obtained from wood are used as base materials, a suspension is prepared, and a lignocellulose membrane is prepared through film casting; then the lignocellulose membrane is subjected to coupling or cross-linking treatment, and the mechanical strength and chemical stability of the lignocellulose membrane are improved; and finally carrying out sensitization, activation and chemical copper plating treatment to obtain the wood-plastic lightweight porous copper foil current collector. The wood-plastic light porous copper foil is rough in surface and porous, so that the adhesive force between an active substance and a current collector is increased, the adhesive force and electric contact between active particles and the current collector are improved, and the rate capability of the battery is further improved; meanwhile, a larger internal space is provided for accommodating the volume change of the active substance, and the cycle life of the battery is prolonged. The problems that a current collector is large in mass, the adhesive force between an active substance and an electrode coating is weak, and a copper foil current collector preparation process is complex in equipment and too high in cost are solved.

The invention discloses a preparation method of plasma activated water based on a micro-nano bubble synergistic effect, and mainly solves the technical problems that the generation efficiency of liquid-phase active particles in the plasma activated water prepared by the existing method is low, the chemical activity of the plasma activated water is difficult to maintain and the like. The preparation method comprises the following steps: introducing micro-nano bubbles into pure water until the pure water is saturated to obtain micro-nano bubble water; then performing plasma activation treatment on the micro-nano bubble water within 3 minutes to obtain plasma activated water based on the micro-nano bubble synergistic effect; the gas adopted by the micro-nano bubbles is one of air, oxygen, nitrogen or helium. The chemical activity of the plasma activated water is enhanced, the maintenance time of the activity of the activated water is greatly prolonged, efficient production and long-acting storage of the plasma activated water are facilitated, and the method has great significance in biomedical application of the plasma activated water.

The invention relates to the technical field of batteries, in particular to an electrode assembly, a preparation method and a lithium ion battery, the electrode assembly comprises a positive pole piece, a negative pole piece and a diaphragm, the positive pole piece comprises a positive current collector and a positive active material layer, and the positive active material layer comprises a positive active material layer and an inorganic coating; the positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer comprises a positive electrode active material, and the positive electrode active material comprises a ternary positive electrode material of which the core nickel content is more than 80 at% and the shell manganese content is 10-20 at%; the negative active material comprises silicon-based active particles and a three-dimensional elastic conductive network layer coating at least part of the surface of the silicon-based particles, and the positive active material and the negative active material are improved, so that various properties of the electrode assembly are good and stable, the overall electrical property and safety of the battery are improved, and the cycle life of the battery is prolonged.

The invention belongs to the technical field of neutralization treatment, and discloses a coal gasification slag and tail gas neutralization treatment device based on amino catalysis, which comprises a working frame, when amino-catalyzed coal gasification slag particles and tail gas are mixed and float upwards, the particles are arranged by the conical surface of a conical block; amino-catalyzed coal gasification slag particles move towards the periphery of the inner wall of a fixed shell, then the amino-catalyzed coal gasification slag particles slide to the top of a lifting table along the inclination angle of a conical annular plate in the natural falling process, and active particles fall into a sedimentation shell through filter holes. In the process, the particles can be screened and separated through floating and falling, when the particles with high activity are mixed with the tail gas, chemical reaction or harmful substance adsorption can be more effectively carried out, and the active particles can fall back to the settling shell through the filter holes to be further treated. Therefore, the cyclic utilization of the particulate matters is ensured.

The embodiment of the invention discloses a secondary battery and electric equipment, the secondary battery comprises an electrode assembly, the electrode assembly comprises a plurality of first pole pieces and a plurality of second pole pieces, and the secondary battery comprises a first coating; the first coating comprises a plurality of first coating blocks, the plurality of first coating blocks are arranged on the surface, facing the second pole piece, of the first pole piece, a first channel is formed between any two adjacent first coating blocks, the first channel is at least communicated with one edge of the first pole piece, and the first channel exposes at least part of the surface, facing the second pole piece, of the first pole piece; the first coating is melted when the temperature is higher than a first preset temperature and at least partially covers the first channel, the area of the first pole piece covered by the first coating after melting is X1, the area of the first pole piece covered by the first coating before melting is Y1, and X1 is larger than Y1. According to the embodiment of the invention, the area of the first coating after melting is increased, so that heat generated by continuous contact reaction between the active particles of the first pole piece and the electrolyte can be slowed down, and the probability of thermal runaway of the secondary battery is reduced.

The invention provides a refrigerator plasma ozone yield regulation and control system and method based on temperature and humidity control. The system comprises a temperature sensor, a humidity sensor, a plasma device and a control unit. The temperature sensor is arranged in the center of the interior of a refrigerator body and used for detecting real-time temperature data in the refrigerator body. The humidity sensor is arranged around a discharge electrode of the plasma device and is used for collecting humidity data of a discharge area in real time; the plasma device is used for generating ozone active particles; the control unit is electrically connected with the temperature sensor, the humidity sensor and the plasma device and used for receiving data of the temperature sensor and the humidity sensor and controlling the working state of the plasma device according to a preset control model. The problem that the ozone yield of plasma carried by the refrigerator is difficult to accurately control is solved.

The invention relates to a multistage self-adaptive plasma excitation and closed-loop feedback processing system, and relates to the field of environmental engineering. After waste gas enters the system, parameters such as odor concentration, temperature and humidity, ozone and the like are detected in real time by a sensor array, and data are fed back to a control center. The method comprises the following steps: decomposing organic high-molecular compounds by pre-ionization, exciting high-density active particles by a main reaction to thoroughly degrade peculiar smell, and decomposing ozone and small-molecular byproducts by using a nano-catalyst in a deep purification stage. The system adopts PID self-adaptive control, parameters can be automatically optimized according to real-time monitoring data, the removal rate is effectively improved, and the energy consumption is reduced. The processed gas is analyzed again through the secondary detection unit, data are uploaded to the cloud model, energy efficiency and processing strategies are continuously optimized through reinforcement learning, and intelligent and closed-loop management is achieved. The device can be widely applied to the field of industrial waste gas treatment, and has the outstanding advantages of efficient removal, low energy consumption, intelligent self-adaption and the like.

The present invention belongs to the field of high-performance catalysts, and provides a low-carbon alkane dehydrogenation catalyst with highly dispersed Pt, a preparation method and an application thereof. By controlling processes such as the carrier preparation process, the Pt impregnation temperature and pH value, and the catalyst post-treatment, the size of Pt active particles and the metal dispersion degree are synergistically controlled, thereby further improving the stability of the catalyst. After 80 h of reaction evaluation, it is found that the propane conversion rate of the catalyst only decreases by 3.3%. At a reaction temperature of 630 °C, it still has high reaction stability. The catalyst has both high activity and anti-carbon deposition ability in the dehydrogenation of low-carbon alkanes to olefins, and solves the problem of low stability of existing catalysts.

The invention provides a discharging device and sterilization equipment, the discharging device comprises a first voltage part and a second voltage part, an interval channel is arranged between the first voltage part and the second voltage part, the first voltage part is provided with a plurality of air inlets penetrating through the two sides of the first voltage part, and the second voltage part is provided with a plurality of air outlets penetrating through the two sides of the second voltage part; air enters the interval channel from one side of the first voltage piece through the air inlet hole, is ionized and then flows out through the air outlet hole. Air is ionized in the interval channel between the first voltage part and the second voltage part to form gas-phase active particles and free radicals with strong oxidizing property, and the gas-phase active particles and free radicals can destroy cell membranes, enzyme systems and genetic materials of microorganisms, so that the microorganisms in the space are efficiently killed, and the safety of the space is improved. Therefore, a relatively strong bacteriostatic and bactericidal effect is achieved; meanwhile, in the sterilization and bacteriostasis process of the discharging device, toxic substances harmful to the human body cannot be generated, the green and harmless sterilization effect is achieved, and man-machine coexistence is achieved.

The invention discloses a preparation method of plasma activated hydrogel, the method is based on a plasma device, the plasma device comprises a plasma pretreatment assembly, a plasma activation assembly and a monitoring control assembly, the preparation method comprises the following steps: adding hydrogel into a pretreatment chamber, generating plasmas by a first plasma generator, conveying the plasmas to the pretreatment chamber to perform oxidation pretreatment on the hydrogel, dropwise adding an alkaline solution into the hydrogel subjected to the plasma oxidation pretreatment to perform neutralization reaction, and performing vacuum freeze drying on the neutralized hydrogel at the temperature of 60 DEG C below zero to 80 DEG C below zero; the freeze-dried hydrogel is subjected to swelling and activating treatment through a plasma activating assembly, and the plasma activated hydrogel is obtained. By adopting the method to prepare the plasma activated hydrogel, efficient loading of plasma active particles can be realized, and the sterilizing effect of the plasma activated hydrogel is improved.

The invention belongs to the field of electrocatalytic oxidation, and provides a preparation method of a DSA electrode. The method comprises the following steps: pretreating a DSA matrix; electrically depositing a tin layer; preparing porous foamed tin; the foamed tin is subjected to anodic oxidation; and modifying with nanoparticles to obtain the DSA electrode. The SnO2-based composite coating DSA electrode is prepared by adopting an electrodeposition combined active particle modification technology, and the method is simple in process and does not have tedious coating and sintering processes; no traditional organic solvent is used, and no related waste gas and waste liquid pollution exists; the surface appearance of the active layer is controllable, and the binding force is good; the usage amount of precious metal is reduced, and the cost is low.

The utility model provides a water film type dielectric barrier discharge water treatment device which comprises a dielectric plate, the dielectric plate is obliquely arranged, the dielectric plate is provided with an upstream face, and the upstream face comprises a plurality of plane areas and concave areas arranged between every two adjacent plane areas; the first electrode is grounded, and the first electrode is arranged opposite to the upstream face; and the second electrode is electrically connected with the power supply, and the second electrode is arranged on the side, away from the upstream face, of the dielectric plate. A discharge area is formed between the first electrode and the second electrode, active particles can be generated, and wastewater is treated through the active particles. A plurality of concave regions are arranged on the smooth dielectric plate, the concave regions can increase the surface area of the dielectric plate relative to a plane region, so that the retention time of wastewater on the dielectric plate is prolonged, and the relative specific surface area of the dielectric plate with the concave regions is far larger than that of a smooth flat plate, so that the contact area of the wastewater and active particles in a discharge region can be enlarged; the pollutant degradation efficiency is greatly improved.