324results about How to "Improve current efficiency" patented technology

The invention discloses an internal circulation rotating impinging stream electro-catalysis device and method for treating organic wastewater, and belongs to the technical field of sewage treatment equipment. The upper part of an inner cavity of an electrochemical reactor of the device is an electrochemical reaction area, and the lower part is a rotational flow generation area; the electrochemical reaction area comprises an outer ring anode, an annular net-shaped cathode, an inner ring anode and a central fixing shaft which are sequentially and coaxially sleeved from outside to inside, and the rotational flow generation area comprises an inner spiral generator and an outer spiral generator which are arranged on a spiral central shaft in a sleeving manner. The impinging stream technology and the electro-catalysis technology are combined, internal circulation impinging stream efficient treatment on organic wastewater is achieved through the rotational flow generation area, the device has the advantages of being high in treatment efficiency, small in occupied space, low in operation energy consumption and the like, the problem that bubbles adhere to the surface of an electrode can be solved, strong turbulent flow is formed through impinging, reaction dead zones are reduced, and the service life of the device is prolonged. Mass transfer in the electrochemical degradation device is enhanced, and the purposes of automatic operation and efficient degradation are achieved.

The invention relates to the field of solar cells, particularly provides a heterojunction cell, and aims to solve the problem that the passivation effect of the side face of an existing heterojunction cell is poor. In order to achieve the purpose, the heterojunction cell disclosed by the invention comprises a substrate, a first passivation layer and a second passivation layer, the substrate is provided with a first surface, a second surface and a side surface adjacent to the first surface and the second surface; the first passivation layer is located on the first surface of the substrate and is plated around the side surface and the second surface of the substrate; the second passivation layer is located on the second surface of the substrate. The first passivation layer which is plated to the side surface and the second surface in a winding manner can passivate the edge composite area of the substrate, so that the possibility that carriers are compounded in the edge composite area is reduced, the probability that the carriers moving to the edge composite area are collected is improved, and the efficiency of the cell is improved.

The invention relates to the technical field of preparation of organic photoelectric materials, in particular to a boron-nitrogen compound and an organic electroluminescent device comprising the same. The boron-nitrogen compound disclosed by the invention has good electron and hole receiving capability, and interaction among luminescent molecules can be effectively inhibited by introducing a spirocyclic group with large steric hindrance. And the energy transmission performance between a subject and an object or a sensitizer can be improved by the large conjugated spiro structure unit. Specifically, the boron-nitrogen compound provided by the invention is used as a functional layer, especially as an organic electroluminescent device manufactured by a luminescent layer, the current efficiency is improved, the lighting voltage is reduced, and meanwhile, the service life of the device is greatly prolonged. Therefore, after most electrons and holes are compounded, energy is effectively transferred to the boron-nitrogen compound, so that high luminous efficiency is realized.

The invention provides a method for preparing a passivation contact region based on an ion implantation technology, which comprises the following steps of: fully crystallizing polycrystalline silicon subjected to chemical vapor deposition, doping the polycrystalline silicon through ion implantation of boron or phosphorus, and activating doped atoms of the implanted boron or phosphorus by adopting rapid heat treatment to obtain the passivation contact region. And the doped boron or phosphorus is controlled to enter the silicon substrate less. According to the method, a boron or phosphorus doping distribution curve close to an ideal design passivation contact region can be obtained by combining boron or phosphorus ion implantation and a rapid heat treatment technology, so that a high-quality hole passivation contact region and an electron passivation contact region can be obtained. On the basis, the invention also discloses a method for preparing the passivated contact battery by adopting the method and the correspondingly obtained passivated contact battery.

The invention discloses a cathode automatic adjustment device for a rare earth electrolytic furnace and an adjustment method thereof, comprising: a cathode main body component, comprising a cathode main body and a moving frame connected to the cathode main body; a moving assembly, comprising a moving frame, a power assembly transmission-connected between the moving frame and the moving frame, and a guide wheel group arranged between the moving frame and the moving frame, wherein the moving frame is provided with a guide member for abutting against the guide wheel group, the guide wheel group is supported on the guide member in the up-down and lateral directions, and constrains the movable gap of the moving frame in the front-back direction; an electrolytic furnace, comprising an electrolytic cell, an anode sheet arranged on the inner wall of the electrolytic cell and a collecting device arranged at the bottom of the electrolytic cell, wherein the cathode main body is placed in the electrolytic cell; a frame assembly, comprising a support, and an adjustment frame rotatably arranged on the support, a cathode lifting assembly is arranged between the adjustment frame and the moving assembly, and a deflection assembly is arranged between the adjustment frame and the support.

The invention provides a diffusion method and a solar cell. In the diffusion method provided by the invention, a silicon wafer is firstly placed in a diffusion furnace, and pre-oxidation treatment is carried out on the silicon wafer for 200-240 seconds under the conditions that the temperature is 820-840 DEG C, the oxygen flow is 200-500 sccm and the nitrogen flow is 2000-3000 sccm; then, under the conditions that the temperature is 750-860 DEG C and the ratio of the flow of the boron source to the flow of the oxygen is 1: 3-1: 4, carrying out pre-deposition treatment on the silicon wafer for 100-160 seconds; carrying out secondary deposition treatment on the silicon wafer for 100-160 seconds under the conditions that the temperature is 840-900 DEG C and the ratio of the flow of the boron source to the flow of the oxygen is (1: 3)-(1: 4); and finally, performing junction pushing on the silicon wafer under the temperature condition of 850-950 DEG C to prepare a boron diffusion layer. Under the comprehensive action of the pre-oxidation treatment, the pre-deposition, the secondary deposition and the junction pushing treatment, the boron source doping concentration can be reduced, diffusion is uniform, diffusion sheet resistance is increased, and meanwhile PN junction distribution becomes shallow.

The invention provides a composition containing a carbazole compound and an organic electroluminescent device. The composition containing the carbazole compound comprises a first component and a second component, the first component comprises a carbazole compound which has a structure as shown in a formula I or a formula II, and the second component comprises a compound with a structure as shown in a formula III. The composition of the composition is designed, and the structure of the carbazole compound is further designed, so that the carbazole compound is suitable for being used as a main body material of a phosphorescent light-emitting layer of the organic electroluminescent device, and the organic electroluminescent device has relatively high current efficiency and relatively long service life.

The invention relates to low-temperature conductive silver copper paste and a preparation method and application thereof in the technical field of solar heterojunction cells. The low-temperature conductive silver copper paste comprises the following components in parts by weight: 1-96 parts of silver powder; 1-96 parts of silver coated copper powder; 0.1 to 5 parts of resin; 0.1-5 parts of a curing agent; 1-10 parts of an organic solvent; wherein the resin comprises epoxy resin and acrylic resin, and the mass ratio of the epoxy resin to the acrylic resin is 1: (0.1-1.6). According to the low-temperature conductive silver-copper paste provided by the invention, through reasonable matching of the resin, the surface wettability of powder particles can be effectively improved, the wettability of the paste is improved, the long-term printability is guaranteed, the printability is enhanced, meanwhile, the double-sided rate is excellent, the reliability is excellent, the aspect ratio is excellent, the photoelectric conversion efficiency is excellent, and the overall performance is excellent through production line verification. And meanwhile, the preparation method of the low-temperature conductive silver-copper paste is simple to operate, free of special requirements on equipment, easy to industrialize and wide in application prospect.

The present invention relates to a novel compound having excellent carrier transport capability, light emission capability, and thermal stability, and an organic electroluminescent device having improved characteristics such as light emission efficiency, driving voltage, and lifespan by including the compound in one or more organic material layers, and to an organic electroluminescent device.

The invention provides an oxazolobenzocarbazole compound, an organic electroluminescent device and a display device, and relates to the technical field of organic electroluminescent materials. The oxazolobenzocarbazole compound disclosed by the invention has a proper energy level and good electron mobility, and can be used as an electron transport material to effectively reduce the potential barrier of electron transport and effectively block the diffusion of holes to one side of an electron transport layer, so that the luminous efficiency of a device can be further improved, the driving voltage can be reduced, and the service life can be prolonged.

The invention belongs to the technical field of industrial wastewater recycling and lithium ion battery positive electrode material preparation, and relates to a method for recycling phosphorus and nickel resources in chemical nickel plating wastewater and synthesizing high-purity iron phosphate through a paired electrolysis method. The method comprises the steps that a double-chamber diaphragm electrolytic cell is adopted, a diaphragm is an anion exchange membrane, an anode is iron, a cathode is at least one of a metal electrode, an alloy electrode and a graphite electrode, an anolyte is a solution containing sulfate radicals, a catholyte is chemical nickel-plating wastewater, a paired electrolysis method is adopted, phosphorus resources are recycled from the anode, and high-purity iron phosphate is synthesized. And nickel resources are recovered through cathode electrodeposition of nickel. According to the method, phosphorus and nickel are recycled through an electro-deposition method, and the current efficiency is greatly improved; the method is high in recovery rate, low in cost and simple in process, industrial large-scale production can be realized, and the recovered iron phosphate has very high purity and can be used as a precursor raw material for synthesizing lithium iron phosphate serving as a positive electrode material of a lithium ion battery.

The invention belongs to the field of organic electroluminescence, and particularly relates to a fused-ring carbazole tetradentate metal platinum (II) complex, an electronic device and application of the fused-ring carbazole tetradentate metal platinum (II) complex. According to the invention, interaction among molecules is reduced through introduction of diphenyl, and a ring-fused carbazole system is introduced to different positions of carbazole, so that the component proportion of a localized state (LE) in an excited triplet state of the cyclotetradentate platinum (II) complex is increased, the cyclotetradentate platinum (II) complex has low acromion, and the molecular luminescence color purity of the material is improved. The material provided by the invention has good chemical stability and thermal stability, and is easy to prepare an evaporation type OLED device. After being combined with a fluorescent doping material, the material can balance hole and electron transmission, so that energy transmission between a subject and an object is more efficient. The current efficiency and the service life of the organic electroluminescent device manufactured by using the compound as a luminescent layer are obviously improved, and the lighting voltage is obviously reduced. Especially, the photochromic purity of the device can be improved by jointly applying the compound and a phosphorescent sensitized boron-containing compound.

The invention relates to the technical field of organic electroluminescent devices, and discloses a fluorine-containing pyrimidine derivative organic compound and application thereof, a perovskite solar cell and an organic electroluminescent device. The organic compound has a structure as shown in a formula (I). The fluorine-containing pyrimidine derivative organic compound provided by the invention can improve the performance of a device, reduce the driving voltage, improve the current efficiency and prolong the service life of the device. # imgabs0 #

The invention discloses an electrochemical system and method for treating nitrogen-containing organic wastewater based on a double-sided cathode. The electrochemical system comprises a reactor, an aeration device, a power supply, an anode and the double-sided cathode, and the double-sided cathode is prepared by loading a functional catalyst through a double-sided rolling coating process. Under the condition of not adding exogenous iron ions and H2O2, the side, with the electro-catalytic degradation function, in the double-sided cathode generates. OH in situ through the oxygen reduction reaction of two electrons and the electro-Fenton process, so that efficient degradation of organic pollutants is realized; meanwhile, NO3 <-> can be converted into N2 to be discharged under the synergistic effect of the sides, with the denitrification function, of the DSA and the double-sided cathode, organic pollutants and total nitrogen are synchronously removed, the denitrification function and the electrocatalytic degradation function are integrated in the single cathode, the device is more compact and efficient, the current efficiency and the mass transfer efficiency are improved, and the device is suitable for large-scale popularization and application. The complexity and the occupied area of the system are reduced, and the energy consumption and the operation cost are reduced.

The invention belongs to the technical field of electrochemical engineering, and relates to a three-dimensional electrochemical reactor which comprises a reactor shell assembly, three-dimensional electrode modules, counter electrode modules, diaphragms or polymer partition plates and an external power supply, the counter electrode modules are arranged in pairs, and the three-dimensional electrode modules are clamped between the counter electrode modules arranged in pairs; the diaphragm or the polymer partition plate is clamped between the electrode surface of the counter electrode module and the electrode surface of the three-dimensional electrode module, and the three-dimensional electrode module, the counter electrode module and the diaphragm or the polymer partition plate are arranged in an inner cavity of the reactor shell assembly; according to the invention, the fluid can flow through the interior and surface of the three-dimensional electrode, and a main electrochemical reaction field is transferred to the interior and surface of the three-dimensional electrode, so that the sufficient flow and mixing of the fluid between the electrodes are ensured while the electrode spacing is shortened as far as possible, the solution resistance is reduced, the cell voltage is reduced, and the current efficiency is improved; and energy consumption increase and equipment damage caused by overhigh voltage are avoided.

The invention provides a triazine-containing carbazole compound and application thereof, the triazine-containing carbazole compound has a structure as shown in a formula I. The triazine-containing carbazole compound obtained by designing the structure of the triazine-containing carbazole compound has good luminescence performance, can be used for preparing organic electroluminescent devices, and can be used for preparing organic electroluminescent devices. Particularly, as a green light main body material in the organic electroluminescent device, the compound can effectively reduce the driving voltage of the organic electroluminescent device and improve the current efficiency of the organic electroluminescent device.

The invention relates to the technical field of organic electroluminescent devices, and discloses a cyanopyrimidine derivative organic compound and application thereof, a perovskite solar cell and an organic electroluminescent device. The organic compound has a structure as shown in a formula (I). The cyanopyrimidine derivative organic compound provided by the invention can improve the performance of a device, reduce the driving voltage, improve the current efficiency and prolong the service life of the device. # imgabs0 #

The invention discloses a multi-membrane stack type electrolysis device for producing acid and alkali by using high-salinity organic wastewater, and relates to the technical field of high-salinity organic wastewater treatment.The multi-membrane stack type electrolysis device comprises a stack system, a direct-current power source system and a liquid path circulation system, and the stack system comprises an anode clamping plate and a cathode clamping plate; an anode plate is arranged at one end, facing the cathode clamping plate, of the anode clamping plate, a cathode plate is arranged at one end, facing the anode plate, of the cathode clamping plate, and a plurality of circulating stack units are arranged between the cathode plate and the anode plate; the circulating stack unit comprises a wastewater chamber partition plate, a cation exchange membrane, an alkali chamber partition plate, a bipolar membrane, an acid chamber partition plate, an anion exchange membrane, a wastewater chamber partition plate and a flexible double-electrode plate. Therefore, under the action of an external electric field, salt cations and salt anions in the wastewater are directionally migrated and respectively enter the alkali chamber and the acid chamber through the anion-cation exchange membrane, so that the purpose of recovering salt is achieved. Meanwhile, salt in the wastewater is removed, and organic matters are degraded, so that the subsequent biochemical treatment efficiency of the wastewater is improved.

The invention belongs to the field of composite electrode preparation, and particularly relates to a high-current-carrying multiphase electrode with a vertical array type carbon nano catalyst layer and a controllable preparation method and application of the high-current-carrying multiphase electrode with the vertical array type carbon nano catalyst layer. The vertical array type carbon nano catalyst layers with different structural sizes (adjustable diameter and height) are synthesized by assisting a chemical vapor deposition method, and the multi-phase electrode with different functional layers is prepared on the carbon-based composite carrier through hot pressing. The high-current-carrying multi-phase electrode provided by the invention can realize the purpose of keeping high-electricity hydrogen peroxide production current efficiency under industrial-grade large current (300 mA / cm < 2 >). The composite electrode is mainly used for in-situ electrocatalytic production of hydrogen peroxide, and under the condition of industrial large current (300 mA / cm < 2 >), the concentration of hydrogen peroxide can reach 1-5 wt%, and the current efficiency can be maintained at 80-99%.

The embodiment of the present invention provides an electrolytic cell temperature distribution adaptive adjustment system and method, the system includes: a thermoelectric power generation unit for performing thermoelectric conversion on the electrolytic cell to generate electrical energy or thermal energy, a regional power management module for collecting the electrical energy generated by the thermoelectric power generation unit and supplying power to the system, a data acquisition module for collecting the state data of the electrolytic cell by using the electrical energy supplied by the regional power management module; a control center for adjusting the temperature of the electrolytic cell according to the state data and the temperature threshold; a monitoring platform for real-time analysis of the state data of the electrolytic cell and displaying the analysis results. The system of the present invention can be quickly deployed without occupying additional external energy, so that the electrolytic cell can adaptively realize regional temperature control, quickly reach or remain in a thermal equilibrium state, and improve current efficiency; at the same time, the overall parameters of the electrolytic cell are monitored and recorded, which brings great economic benefits to subsequent energy-saving analysis.

The invention relates to the technical field of energy storage, and discloses an all-vanadium redox flow battery electrolyte additive which comprises the following components in percentage by mass: 45-55% of modified coumarin, 40-50% of amino acetylacetone and 5-15% of nitrobenzaldehyde, the modified coumarin comprises at least one hydroxyl group; the amino acetylacetone is prepared by reacting acetylacetone with an ammonia source; the nitrobenzaldehyde is prepared by introducing at least one nitro group on an aromatic ring of benzaldehyde through nitration reaction. According to the electrolyte additive disclosed by the invention, the modified coumarin, the amino acetylacetone and the nitrobenzaldehyde are introduced, so that the stability of an electrolyte under a high-temperature condition is remarkably improved, and self-agglutination and precipitation of pentavalent vanadium ions in the electrolyte are reduced, so that possible safety problems such as short circuit or instability of the electrolyte are avoided; and the maintenance and replacement frequency of the electrolyte is also reduced.

The invention relates to the related technical field of electrochemical electrodes, and discloses a preparation process and a use method of an electrochemical composite electrode, and the preparation process comprises the following steps: S1, weighing a certain amount of materials according to a mass ratio of a piezoelectric material to PVDF (or P (VDF-TrFE)) of 1: 20-4: 1, dissolving and dispersing in N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide, the preparation method comprises the following steps: adding PVDF (or P (VDF-TrFE)) into a mixture of one or more polar organic liquids such as N, N-dimethylacetamide, dimethyl sulfoxide and the like, stirring or ultrasonically dispersing uniformly to prepare a PVDF (or P (VDF-TrFE)) solution with the mass percent of 5-20%; the composite electrode provided by the invention is low in production cost, simple in preparation method and easy to amplify to realize industrial production, the electro-catalytic performance of the composite electrode in circulating water treatment is remarkably improved through an optimized heat treatment process, and the electrode shows higher electrochemical efficiency in treatment of industrial wastewater containing high-concentration organic pollutants and has good application prospects. And the service life is prolonged to 6000 hours, and is prolonged by 20% compared with the service life of a traditional electrode.

The invention discloses an electrolytic bath, and belongs to the technical field of electrochemical synthesis. The electrolytic bath comprises a first electrolytic bath body and a second electrolytic bath body which are located on the two sides of a diaphragm plate respectively, the first electrolytic bath body comprises an anode chamber, the second electrolytic bath body comprises a cathode chamber, and an anode plate of the anode chamber and a cathode plate of the cathode chamber abut against the diaphragm plate respectively; the first electrolytic cell body and the second electrolytic cell body each comprise a supporting shell, partial areas of the supporting shells are transparent areas, and detachable flow field adjusting assemblies are arranged in the anode chamber and the cathode chamber respectively. The flow field adjusting assembly comprises a supporting frame and at least one baffle plate which is adjustably connected to the interior of the supporting frame and changes the flowing direction of fluid. The flow field of the electrolytic cell can be conveniently adjusted, and an electrochemical reaction kinetic model in the electrolytic cell can be conveniently researched.

The invention belongs to the technical field of waste aluminum recovery, and particularly relates to an electrolytic cell for override recovery of pure aluminum from scrap aluminum and a use method of the electrolytic cell. The electrolytic cell comprises a scrap aluminum inlet cover plate, a scrap aluminum anode, a porous ceramic plate, a pure aluminum inlet and outlet cover plate, an electrolyte, an electrolytic cell cover plate, an electrolytic cell shell, a pure aluminum cathode, an electrolytic cell heat preservation layer, an electrolytic cell insulation layer, a cathode guide rod, a cathode graphite block, an insulation partition plate, an anode graphite block and an anode guide rod. Current enters the liquid scrap aluminum anode through the anode guide rod and the anode graphite block, then enters the liquid pure aluminum cathode through the molten electrolyte immersed in the scrap aluminum anode, the porous ceramic plate and the molten electrolyte in the cathode chamber in sequence, and finally is led out through the cathode graphite block and the cathode guide rod; in the electrolysis process, aluminum in the scrap aluminum anode is subjected to electrochemical dissolution, enters the molten electrolyte in the form of aluminum ions and moves to the liquid pure aluminum cathode through the molten electrolyte to be separated out.

The invention relates to a method for preparing metallic titanium through two-step electrolysis in halide molten salt, and belongs to the technical field of metallurgy. The method comprises the following steps: by taking fluorine-chloride mixed molten salt as primary electrolytic molten salt, adding TiO2 into the fluorine-chloride mixed molten salt, uniformly mixing, heating the fluorine-chloride mixed molten salt containing TiO2 to the electrolytic temperature of 650-850 DEG C in an inert atmosphere, inserting a cathode and an anode, carrying out primary molten salt electrolysis, taking out a cathode product, and carrying out secondary electrolytic treatment on the cathode product to obtain the TiO2 / TiO2 composite material. Performing vacuum distillation or washing on the cathode product to remove impurities, and drying to remove attached electrolyte to obtain a primary electrolytic product crude titanium; the method comprises the following steps: by taking primary electrolysis product crude titanium as a soluble anode, high-purity metal titanium as a cathode and chloride molten salt as secondary electrolysis molten salt, heating the chloride molten salt to the electrolysis temperature of 550-750 DEG C in an inert atmosphere, inserting the cathode and the anode, performing electrolytic refining, and washing the electrolysis product with diluted hydrochloric acid and deionized water to remove impurities, thereby obtaining the low-oxygen metal titanium powder. A low-melting-point molten salt system is adopted in two-step electrolysis, and energy consumption can be effectively reduced.

The invention discloses an organic electroluminescent material and a device thereof. The organic electroluminescent material is a compound with a structure as shown in a formula 1. The novel compounds can be used as luminescent materials in organic electroluminescent devices, and can provide better device performance, such as narrower half-peak width, higher current efficiency and external quantum efficiency. The invention further discloses an organic electroluminescent device containing the compound with the structure shown in the formula 1 and a compound composition.

The invention provides a carbazole compound and an organic electroluminescent device containing the same. The carbazole compound has a structure as shown in a formula I or a formula II. The structure of the carbazole compound is designed, so that the carbazole compound is suitable for being used as a main body material of a light-emitting layer of the organic light-emitting device, and the organic light-emitting device has relatively high current efficiency and relatively long service life.

The invention relates to an aluminum circulation method for metal aluminum energy storage and hydrogen production, and belongs to the technical field of aluminum material production. The method comprises the steps that aluminum oxide is fed into an electrolytic aluminum factory for electrolysis, and metal aluminum liquid is obtained; the metal aluminum liquid is processed, and the aluminum-based hydrogen production material with the large specific surface area is obtained; the method comprises the following steps: carrying out chemical reaction on an aluminum-based hydrogen production material and water under the action of a nitrogen-containing strong alkaline organic matter catalyst to obtain hydrogen and alumina hydrate slurry; performing solid-liquid separation on the alumina hydrate slurry to obtain alumina hydrate and an aqueous solution containing the catalyst; roasting the alumina hydrate to obtain high-activity metallurgical-grade alumina; the high-activity metallurgical-grade aluminum oxide is cyclically used for preparing metal aluminum liquid through electrolysis, and the aqueous solution containing the catalyst is cyclically used for hydrogen production through reaction of the aluminum-based hydrogen production material and water, so that a closed-loop cycle is formed. The defects of high energy consumption, high carbon emission intensity, high cost and the like in the metal aluminum preparation and aluminum recycling process are overcome.

The present invention discloses an electrolytic separation device for separating arsenic and gallium from gallium arsenide waste residue, comprising an electrolytic cell, wherein an anode plate, a cathode plate, a first diaphragm and a second diaphragm are arranged in the electrolytic cell, wherein the first diaphragm and the second diaphragm are arranged between the anode plate and the cathode plate; the anode plate, the cathode plate, the first diaphragm and the second diaphragm separate the electrolytic cell into an anode region, an arsenic removal region and a cathode region which are independent of each other, wherein the anode region is located between the anode plate and the first diaphragm, the arsenic removal region is located between the first diaphragm and the second diaphragm, and the cathode region is located between the second diaphragm and the cathode plate. The present invention also provides an electrolytic separation method for separating arsenic and gallium from gallium arsenide waste residue using the electrolytic separation device. The present invention adopts a combination of slurry electrolysis and cyclone electrowinning to achieve efficient leaching of gallium arsenide waste, avoids contamination of the cathode electrolyte, and the purity of the cathode product gallium is high, thereby achieving efficient separation of gallium and arsenic.

The invention provides a 6, 6-dimethyl-6H-benzo [cd] pyrene compound, an intermediate thereof, an organic electroluminescent device and a display device, and relates to the technical field of organic photoelectricity. The structural general formula of the 6, 6-dimethyl-6H-benzo [cd] pyrene compound is # imgabs0 #, and m and n are respectively and independently selected from 0 or 1; hydrogen atoms in the formula I are respectively and independently substituted or not substituted by deuterium atoms, F, CN, C1-C12 alkyl, C6-C30 aryl or C3-C30 aromatic heterocyclic groups. According to the present invention, the structure of the 6, 6-dimethyl-6H-benzo [cd] pyrene compound is designed, such that the obtained 6, 6-dimethyl-6H-benzo [cd] pyrene compound has excellent performance, and the organic light-emitting device prepared by using the 6, 6-dimethyl-6H-benzo [cd] pyrene compound as the light-emitting layer material has characteristics of low driving voltage, high current efficiency and long service life.