70 results about "Electron pair" patented technology

The invention belongs to the technical field of coke oven gas purification treatment, and particularly discloses a method for removing hydrogen sulfide in coke oven gas through photocatalysis, generation of oxygen vacancies is promoted by adopting a synthesis concept of synergistic effect of silver doping and polyethyleneimine, polyethyleneimine provides an alkaline condition on one hand, lone electron pairs on nitrogen are coordinated with zinc on the other hand, and the hydrogen sulfide in the coke oven gas is removed through photocatalysis. The preparation method comprises the following steps: by taking H2S and polyethyleneimine as raw materials, generating abundant oxygen vacancies under the synergistic effect of the H2S and silver, preventing agglomeration of generated ZnO and increasing reaction sites by taking polyethyleneimine as a surfactant, and then promoting a cascade reaction between ZnO < 1-x > and H2S by taking abundant oxygen vacancies, so that a 1D / 3D-ZnS / ZnO heterojunction is generated in situ to further reduce recombination of photo-generated electron holes; the catalyst converts H2S into elemental sulfur through photo-induced electrons and holes, and a carbon disulfide solution is used for cleaning the catalyst to realize regeneration of the catalyst. The method provided by the invention not only improves the removal efficiency of H2S, but also reduces the operation cost and reduces environmental pollution.

The invention discloses a high-uniformity PCB pattern electroplating method based on pulse electroplating, and aims to solve the problem of insufficient copper thickness uniformity caused by residual copper rate difference, unreasonable process edge design, poor accompanying plating plate adaptability and direct current electroplating defects in traditional pattern electroplating. A plating block is arranged on the process edge of a PCB to share current, a special accompanying plating plate matched with the residual copper rate is configured to optimize an electric field, an electroplating solution containing Fe < 2 + > / Fe < 3 + > redox electron pairs and an insoluble titanium mesh anode are adopted, the two-step pulse electroplating process is combined, and the additive ratio and electroplating environment parameters are regulated and controlled, so that uniform deposition of a copper layer is achieved. The method effectively solves the problems that the local copper layer is too thick / too thin, and filling defects exist in the hole, and improves the reliability and signal transmission performance of the PCB coating.

Provided are a multilayer body and a production method for a printed wiring board. A multilayer body according to the present invention includes a metal foil that has a surface roughness Rz of no more than 2 μm as measured in accordance with JIS B0601 1994 at at least one surface and a layer that contains a resin composition and is provided on a surface of the metal foil that has a surface roughness Rz of no more than 2 μm. The resin composition includes a thermosetting compound and a compound that has an unshared electron pair, includes an aromatic ring, and has a melting point of at least 10°C. The thermosetting compound may also have an unshared electron pair.

A novel display panel is provided. The display panel includes a first light-emitting device, a second light-emitting device, and a partition wall. The first light-emitting device includes a first electrode, a second electrode, and a first layer sandwiched therebetween. The first layer contains a first organic compound and a first metal. The first organic compound includes an unshared electron pair. The first metal belongs to Group 5, Group 7, Group 9, Group 11, or Group 13. The second light-emitting device includes a third electrode, a fourth electrode, and a second layer sandwiched therebetween. The second layer contains the first organic compound and the first metal. A first space is provided between the second layer and the first layer. The partition wall has a first opening and a second opening. The partition wall overlaps with the first space between the first opening and the second opening.

Light-emitting diode (100, 200) with several quantum dots (10), having the light-emitting diode (100, 200): a first electrode (110, 210) and a second electrode (120, 220); an emitting material layer (150, 250); an electron transfer layer (164, 244); and a hole transfer layer (144, 264), wherein the emitting material layer (150, 250) is arranged between the electron transfer layer (164, 244) and the hole transfer layer (144, 264) and the emitting material layer (150, 250) has the quantum dots (10), where the quantum dots exhibit (10): a semiconductor nanocrystal or metal oxide core (20); a shell (30) covering the semiconductor nanocrystal or metal oxide core (20), wherein the shell (30) has an outer surface; an X-type ligand (42) having a functional group selected from the group consisting of a carboxylate group, a phosphate group and a thiolate group, which is bonded to a first region of the outer surface; and an L-type ligand (44) having a functional group selected from the group consisting of an amino group, a thiol group, a phosphine group and a phosphine oxide group, which is bonded to a second region of the outer surface, wherein the X-type ligand (42) is bound to the first region of the outer surface by a negatively charged functional group, and the L-type ligand (44) is bound to the second region of the outer surface by an undivided electron pair, wherein a multitude of the first regions of the outer surfaces of the quantum dots (10) are proximal to the hole transfer layer (144, 264) and distal to the electron transfer layer (164, 244), wherein a multitude of the second regions of the outer surfaces of the quantum dots (10) are proximal to the electron transfer layer (164, 244) and distal to the hole transfer layer (144, 264), and where the outer surface is spherical and the first area is a first hemisphere and the second area is a second hemisphere.

The invention discloses a high-efficiency polycarboxylic acid polyether macromonomer preparation method, and belongs to the field of polycarboxylic acid polyether macromonomers, in the reaction, enol is added, nitrogen is used for replacement, then trimethylaluminum and anhydrous zinc chloride are added, stirring is carried out for dissolution, metallic sodium is added as a catalyst to obtain an initiator, the reaction time is 200-360 min, the addition amount of trimethylaluminum is 0.002-0.003%, the reaction time is 1-2 min, and the reaction time is 1-2 min. The addition amount of anhydrous zinc chloride is 0.005-0.006%, and the principle is that trimethylaluminum and anhydrous zinc chloride belong to Lewi acids, have a vacancy capable of accepting electron pairs to form coordinate bonds, react with Lewi alkali, and can be combined with alcohol to generate Lewi acid characteristics to react with metal sodium. In the prior art, a larger reactor is configured to increase the single-batch yield of an initiator, the input amount of single-batch alkali metal (such as metal sodium and sodium hydride) is increased sharply, and the production risk is greatly improved; and meanwhile, the prolonging of the storage time of the initiator can cause the increase of chromaticity and directly influence the stability of product indexes, and the method is mainly applied to the synthesis of polycarboxylic acid polyether macromonomers.

The application provides an electrolyte and a battery comprising the electrolyte, wherein the diazonium salt compound in the electrolyte can be decomposed in advance to generate a large amount of inert gas before a large amount of organic solvent is volatilized to generate gas during a furnace temperature test, and the inert gas is discharged from the pole lug, so that the generated heat is timely released, heat accumulation in the interior is avoided, and heat runaway is avoided; on the other hand, the volatilization of the organic solvent can cause the ion channel in the battery to be closed, so that the side reaction is stopped, the battery can safely pass the furnace temperature test, and the safety of the battery under the condition of heat runaway is significantly improved. Meanwhile, the electron-deficient B element in the diazonium salt compound in the electrolyte has Lewis acidity, can accept an electron pair, can remove HF in the electrolyte, avoids the damage of HF to the interface protection film, and further improves the high-temperature storage performance of the battery.

This invention discloses a photoelectrocatalyst and its preparation method, wherein the photoelectrocatalyst comprises Zn 2+ Ce 4+ Au; Zn 2+ Including ammonium acetate, zinc nitrate, and hexamethylenetetramine; Ce 4+ Including cerium nitrate, ammonium chloride, and potassium chloride; Au includes PVP, sodium citrate, potassium bromide, and chloroauric acid; Zn 2+ Ce 4+ The molar ratio of Au to Zn is... 2+ Ce 4+ Au = 1:0.5 ~ 1:2.5 * 10 ‑7 ~7.5*10 ‑7 This method uses electrodeposition to prepare ZnO as a substrate. Its vertically aligned one-dimensional (1D) nanostructures exhibit quantum size-dependent effects, effectively shortening the carrier diffusion distance. CeO2 coats the ZnO, forming a stable, acid- and alkali-resistant substrate material. CeO2 traps electrons from Ce... 4+ Restored to Ce 3+ This forms oxygen voids and Ce 3+ / Ce 4+ Electron pairs produce high catalytic activity.

The invention provides an 18-crown-6 modified eutectic solvent, a preparation method thereof and a method for extracting cobalt and nickel from hydrochloric acid leachate of a retired lithium ion battery, and belongs to the technical field of metal recovery. According to the invention, oxygen atoms in 18-crown-6 molecules have strong electron pairs and can form coordinate bonds with metal ions; meanwhile, the structure of the 18-crown-6 has relatively high selectivity and shows relatively strong affinity to cobalt and nickel; when the 18-crown-6 is combined with the metal ions, the solubility and the stability of the metal ions in the eutectic solvent can be remarkably improved, so that the extraction effect is optimized; in addition, the 18-crown-6 can also improve the stability of the eutectic solvent, enhance the hydrophobicity of the solvent, avoid the volatilization and dissolution problems of the solvent, and further improve the extraction selectivity and efficiency; 18-crown-6 is used for modifying and synthesizing a hydrophobic deep-eutectic solvent, and the metal extraction performance of the hydrophobic deep-eutectic solvent can be remarkably improved.

The application belongs to the field of space electric propulsion, and particularly relates to a working medium-free cathode neutralization circuit for a microwave ion thruster; the circuit comprises an ion thruster, a bias power supply and a cathode power supply circuit; the ion thruster is used for coupling discharge to generate an ion plume, the cathode power supply circuit is used for releasing electrons to neutralize the ion plume generated by the ion thruster; the bias power supply is used for adjusting the potential difference between the cathode neutralization ion thruster; the positive electrode of the bias power supply is connected with the ion thruster, and the negative electrode of the bias power supply is connected with the cathode power supply circuit, so that high-precision neutralization of the ion plume of the thruster is realized, the problem of thrust eccentricity caused by insufficient neutralization precision of the ion plume of the thruster is solved, and the cathode life is improved.

The present invention provides a novel compound and an organic light-emitting device comprising the same, in which a rigid fluorene-based substituent is introduced into 1,10-phenanthroline having a non-shared electron pair. When the compound is applied to one or more organic layers of an electron transport layer (ETL), a hole blocking layer (HBL), and an N-type charge generation layer (N-CGL), the compound enables the implementation of low voltage, high efficiency, and long life of an organic light-emitting device.

The invention belongs to the technical field of perovskite. The invention provides a functional layer for improving the stability of a perovskite thin film and a preparation method and application thereof. The functional layer comprises a novel covalent organic framework material (COFs material). The structures of the COFs materials can form fine micro / nano-scale pore diameters, and the COFs materials not only have high surface area, but also have stable non-polar vinyl bonds. In the COFs material, an azine unit of a lone electron pair is completely exposed to provide a strong hydrogen bond accepting site in a one-dimensional channel, so that the COFs material has excellent water absorption performance. The functional layer containing the COFs material can significantly reduce the erosion of water vapor to the perovskite film, and the stability of the perovskite device is greatly improved.

The invention discloses a tokamak rupture escape electron real-time control method and system. The method comprises the steps that S1, real-time data monitoring of plasma operation is carried out; s2, on the basis of the monitoring data in the step S1, identification and prediction of the operation state of the plasma are completed; s3, when plasma rupture is identified or predicted in the step S2, emitting a strong magnetic disturbance field and / or injecting gasified tungsten to the plasma, dissipating rupture escape electrons, if generation of the rupture escape electrons is successfully avoided, completing the task, and if generation of the rupture escape electrons is not successfully avoided, entering S4; s4, the plasma is pushed to impact the first wall of the strong field side of the device, if the escape electrons are successfully eliminated, the task is completed, and if the generation of the broken escape electrons is not successfully eliminated, the step S5 is executed; and S5, injecting deuterium into the plasma core part to freeze and crush the projectile, relieving rupture escape electrons, and completing the task. Therefore, the damage to the tokamak fusion device caused by the broken escape electrons is avoided and relieved.

The invention relates to a method for preparing an electron transport layer in a perovskite battery through magnetron sputtering and the perovskite battery, the magnetron sputtering is carried out by adopting the method provided by the invention, secondary electrons generated by target materials serving as cathodes are interacted by an electric field and a magnetic field, and then are effectively controlled in a space defined by at least two target materials, so that the electron transport layer in the perovskite battery is prepared. Columnar plasmas are formed, the collision ionization probability between electrons and reaction gas is further increased, the ionization degree of the reaction gas is effectively improved, and the deposition rate of the electron transport layer on the surface of the perovskite layer is increased. Besides, the plasma formed by the secondary electrons is bound in the space enclosed by the at least two target materials, so that the bombardment effect of the electrons with relatively high kinetic energy on the substrate can be avoided, the damage to the substrate is further effectively reduced, meanwhile, the temperature rise of the perovskite layer in the magnetron sputtering process is also inhibited, and the cycling stability of the perovskite battery is ensured.

The utility model discloses iron-based horizontal pulse electroplating equipment which comprises an electroplating tank and a copper dissolving tank used for dissolving pure copper particles to form electroplating liquid, and the copper dissolving tank is connected with the electroplating tank through a conveying pipeline; the electroplating bath comprises a bath body and a plurality of groups of anode boxes arranged in the bath body, each group of anode box comprises a lower frame body arranged at the bottom of the bath body, an upper frame body spaced from the lower frame body, a plating solution spraying device arranged on the lower frame body and the upper frame body, and a titanium mesh flatly laid in the lower frame body, and the titanium mesh of each group of anode boxes is respectively connected with a pulse rectifier. According to the iron-based horizontal pulse electroplating equipment provided by the utility model, the maintenance frequency can be obviously reduced, so that the cost of manpower and material resources is saved, the productivity is improved, the purpose of continuous clean production can be achieved by utilizing a Fe < 2 + > / Fe < 3 + > redox electron pair technology and only by regularly supplementing pure copper particles in the copper dissolving tank, the uniformity of electroplating copper thickness can be improved, and the deep electroplating capability of electroplating can be improved.

The invention discloses a process method for improving the pixel performance of a CMOS image sensor, and the method at least comprises the following steps: S1, providing a P-type substrate, and growing a first epitaxial layer on the P-type substrate; s2, growing an N-type epitaxial layer on the first epitaxial layer; the doping concentration of the N-type epitaxial layer is in a rising trend from the first epitaxial layer along the growth direction of the N-type epitaxial layer. According to the process method, cross contamination caused by hole electron pair recombination in the P-type or N-type epitaxial layer can be avoided, the hysteresis effect and image ghosting are reduced, the problem of uneven concentration distribution caused by impurity atom diffusion is effectively solved, and therefore the pixel performance is improved.

The invention discloses a method and device for inhibiting a negative hydrogen ion source from leading out electrons and maintaining uniformity, and relates to the technical field of magnetic confinement fusion, and the method comprises the steps: building a discharge chamber of a radio frequency dual-drive ion source comprising a drive source region, a diffusion region and a grounding shielding cover, and enabling the drive source region to be in sealed connection with the diffusion region, a back plate is made of stainless steel, the side wall is a quartz cylinder wound with a radio frequency copper wire coil, and a partition plate or a grid mesh is arranged near an outlet of the driving source area; discharging gas is introduced into the cavity, power is applied to the coil to generate plasma, and electrons are absorbed through the partition plate or the grid mesh to achieve the suppression effect. The method does not need to depend on a filtering magnetic field, E * B-and anti-magnetic drift interference can be avoided, damage of electrons to H-ions is effectively reduced, grid thermal load is reduced, plasma uniformity can be maintained, the density ratio of the electrons to negative hydrogen ions is optimized, and beam quality and transmission efficiency are remarkably improved.

The application discloses a method for preparing activated carbon by treating rectifying still residues with low-temperature plasma, which comprises the following steps: putting dry rectifying still residues into a low-temperature plasma generating device, and introducing working gas; adjusting the discharge power of the low-temperature plasma generating device to carry out discharge treatment, so that the working gas is converted into low-temperature plasma at room temperature, and the rectifying still residues generate activated carbon in the atmosphere of the low-temperature plasma. The method for preparing activated carbon by treating rectifying still residues with low-temperature plasma forms various active particles with oxidation capacity in the treatment process, destroys the covalent bonds of organic matters in the rectifying still residues at room temperature, and the generated ultraviolet photons make the shared electron pairs in the covalent bonds absorb the photons and enter into an excited state, and the absorbed energy of the molecules in the excited state when returning to the ground state makes the covalent bonds break and recombine, and generates covalent bonds with higher binding energy, so that the H, O, P, N and other heteroatoms in the organic matters are removed, and the activated carbon with rich porosity is obtained.

The present invention discloses a tellurium-based optical crystal material with large birefringence, a preparation method thereof and an application thereof, and belongs to the technical field of optical materials. 4+ In the cation, an organic π-conjugated ring-o-phenanthroline and a Cl element that is beneficial to the blue shift of the ultraviolet cutoff edge are introduced. Under the condition of ethanol as solvent, Te 4+ was reduced to Te 2+ In addition, the two N on o-phenanthroline contain lone pairs of electrons, making it a good bidentate ligand. In the process of synthesizing crystals, it provides lone electron pairs to Te 2+ Forming a chemical coordination bond, the organic coordination bond allows Te 2+ It shows a neat and consistent planar structure, which makes the groups arranged neatly and uniformly, effectively increasing the optical anisotropy of the compound and obtaining an optical crystal with extremely high birefringence (C 12 H8N2)TeCl2, the birefringence can reach 1.086@546 nm.

This application discloses an electron beam accelerating tube and an electron beam accelerator, relating to the field of electron beam accelerator technology. The electron beam accelerating tube includes a first cavity and a suppression cavity. A first electromagnetic field is generated within the first cavity, which is used to accelerate the electron beam emitted from the electron gun through the first electromagnetic field, and the first electromagnetic field forms a leakage field. The suppression cavity is disposed between the first cavity and the electron gun, and the suppression cavity establishes a second electromagnetic field within itself through the leakage field. The intensity of the second electromagnetic field is higher than the intensity of the leakage field, and the second electromagnetic field is used to suppress the movement of electrons in the electron beam toward the electron gun. Using the electron beam accelerating tube disclosed in this application can reduce the back-bombardment phenomenon of electrons on the electron gun, improving the performance and lifespan of the electron gun.

An image sensor, a control method, and an electronic device, the image sensor having a pixel region, a peripheral logic region located at the periphery of the pixel region, and a transition region located between the pixel region and the peripheral logic region, the transition region comprising an interception circuit structure, the interception circuit structure comprising an interception doping region and a potential providing structure, the potential providing structure is at least used for providing a preset potential for the interception doping region and attracting peripheral electrons. A transition region is arranged between a pixel region and a peripheral logic region, an interception circuit structure is arranged in the transition region, and a potential providing structure of the interception circuit structure can be used for providing a preset potential for an interception doping region and attracting peripheral electrons during image acquisition; therefore, the phenomenon that the number of electrons in a peripheral circuit is increased under the dark condition due to light emission, heat emission or stress difference is avoided, and the influence of peripheral electrons on a pixel array in a pixel area is avoided. As the interception circuit structure is arranged to intercept the peripheral electrons, the number of the virtual pixel units can be reduced, and even the virtual pixel units do not need to be arranged.

The application discloses an energy conversion device and a preparation method thereof and a long-time energy supply device. The energy conversion device comprises a first electrode, a passivation layer, an electron transport layer, a perovskite absorption layer, a hole transport layer and a second electrode which are arranged in a stack. The passivation layer is covered on the surface of the electron transport layer. The passivation layer prevents water and oxygen in the external environment from invading the perovskite absorption layer, reduces material degradation and performance attenuation caused thereby, and thus improves the long-term stability of the nuclear battery. In the use process of the beta nuclear battery, the energy of the excess beta rays can be deposited in the passivation layer. The passivation layer reduces the damage of high-energy electrons to the electron transport layer, and thus further improves the long-term stability of the nuclear battery. The first electrode, the passivation layer, the electron transport layer, the perovskite absorption layer, the hole transport layer and the second electrode are synergistically used, so that the long-term stability and service life of the energy conversion device are improved.

According to the enhanced high-electron-mobility transistor and the preparation method thereof provided by the invention, the P-type delta doping layer with higher doping concentration is arranged in the P-type gate structure, so that an electron barrier is formed in the P-type gate energy band structure, and in the working process of a device, the electron barrier can prevent electrons from flowing in the gate structure, so that electric leakage is reduced, and the reliability of the device is improved. Meanwhile, bombardment of electrons to gate metal is avoided, and gate reliability is improved; meanwhile, the delta doping layer can form hole potential wells in the P-type gate energy band structure one by one, and free flow of holes cannot be greatly influenced, so that the holes are freely injected into the device, and relatively low working on-resistance of the device is ensured; the inserted P-type delta doping layer can reduce the overall resistivity of the P-type gate structure to a certain extent, reduce the input resistance, and facilitate the improvement of the crystal quality of the overall P-type gate structure; and the P-type delta doping process can be compatible with the existing traditional epitaxial process equipment, and the process is simple and easy to implement.

The invention discloses a portable detection device and a detection method for detecting microcystic toxins based on bismuth oxybromide doped biomass carbon, and belongs to the field of photoelectrochemical detection devices. The prepared BiOBr-coated BC nano composite material is used as a working electrode and is applied to a detection device, and the detection device further comprises a control system and a detection system. The detection system is fixed in the detection system shell, and the control system is fixed in the control system shell. Wherein the control system controls the LED lamp to emit exciting light to irradiate the working electrode, and the nano material in the detection system enters an excited state after receiving light to generate current. After a detection target object is added, separation of hole electron pairs can be influenced, so that the change of current is influenced. The concentration of the detected object is reflected by detecting the current change after the target objects with different concentrations are added. The device provided by the invention can realize detection of weak current signals, and meanwhile, compact and small equipment provides a scheme for portable detection.

The invention relates to the technical field of perovskite batteries, in particular to a passivation solution for a perovskite film layer interface, a passivation layer, a preparation method of the passivation layer and a battery. The invention provides a passivation solution for a perovskite film interface, the passivation solution comprises a passivator and a solvent, and the passivator comprises a nicotinic acid compound and / or an isonicotinic acid compound. The passivation solution acts on a perovskite film layer interface and can passivate perovskite defects, lone electron pairs of C = O on carboxyl interact with under-coordinated Pb < 2 + >, non-radiative recombination loss can be reduced, defect ion migration is inhibited, meanwhile, the passivation effect is improved through cooperation with different substituted functional groups on pyridine, the quality of a perovskite film layer is improved, and the perovskite film layer is prepared. The ultraviolet light stability of the cell is improved, and the photoelectric conversion efficiency is improved.

A metal-supported nonwoven fabric is provided which enables effective synthesis of a target product when used as a catalyst in a flow reaction. The metal-supported nonwoven fabric comprises a nonwoven fabric containing polyolefin fibers or PET fibers, and metal particles. The nonwoven fabric has grafted side chains bound thereto formed of polyvinylpyrrolidone, polyacrylic acid, or a polymer containing functional groups with unshared electron pairs. The metal particles are supported by the grafted side chains via pyrrolidone groups of the polyvinylpyrrolidone, carboxy groups of the polyacrylic acid, or the functional groups with unshared electron pairs.

The invention provides a compound, an organic electroluminescent composition, an organic electroluminescent device and terminal equipment. The compound provided by the invention has a structure as shown in a formula I. The compound has a wide band gap, a high triplet state energy level and an asymmetric highly-twisted spatial configuration, and can improve the film-forming property and hole transport capability of an organic thin film at the same time, thereby improving the uniform distribution of hole-electron pairs in a luminescent layer, and improving the luminous efficiency of the organic thin film. Exciton quenching of the light-emitting layer and an interface between the transmission layer and the light-emitting layer is reduced, so that the light-emitting efficiency of the blue phosphorescent device is improved, and the service life is prolonged.

A reliable light-emitting element with low driving voltage is provided. The light-emitting element includes an electron-injection layer between a cathode and a light-emitting layer. The electron-injection layer is a mixed film of a transition metal and an organic compound having an unshared electron pair. An atom of the transition metal and the organic compound form SOMO.

The application discloses a method for breaking C-O bridge bonds in coal-based platform molecules by microwave-assisted catalytic hydrogenolysis, and adopts active carbon loaded metal as a catalyst to hydrogenolyze coal-based platform molecule compounds under microwave-assisted heating, and adds solid acid in the reaction, so that the method and application for preparing fuel and fine chemicals by catalytic hydrogenolysis of coal-based platform molecule compounds are realized under normal pressure and temperature conditions. In the reaction process, microwave heating has the advantages of fast and uniform heating speed, high energy efficiency, easy operation control and the like, wherein the active carbon carrier can absorb microwaves and rapidly heat up, the existence of the metal can cause high hotspot temperature, and the solid acid can accelerate the reaction speed and control the product selectivity, through the action of giving protons or accepting electron pairs to the reactants, so that active carbon cation intermediate compounds are formed, the breaking of C-O bridge bonds in coal-based platform molecules is promoted, and then the coal-based platform molecules are decomposed into target products. The reaction process is environmentally friendly, raw material utilization rate is high, and has a good industrial application prospect.

The invention discloses a catalyst for preparing formic acid through electrocatalytic reduction of low-concentration CO2, a preparation method and application, and belongs to the field of CO2 electroreduction. The catalyst is a bismuth-based catalyst modified by proton ionic liquid, the proton ionic liquid is formed by Bronsted acid-base neutralization, the base comprises 1, 8-diazabicyclo [5, 4, 0] undec-7-ene and tetramethylguanidine, and the acid comprises trifluoroethanol, acetic acid and hydrochloric acid. The cation side can be used as a proton donor in a proton / electron pair migration reaction to which CO2 electroreduction belongs, and raw material protons are promoted to be transferred to a reduction intermediate. The electronegativity of the anion side is beneficial to adsorption and activation of a reactant CO2. And anions and cations play a synergistic catalysis role, so that the catalytic reaction activity is greatly improved. A flowing electrolytic tank carrying the catalyst can directly reduce low-concentration CO2 simulating industrial emission waste gas into formic acid at room temperature and normal pressure, and separated and purified CO2 does not need to be used as raw material gas.