1212results about "Electrode shape/forms" patented technology

Disclosed in the present invention are a method for manufacturing a high specific surface area anode string, and an ECO reactor, relating to the technical field of ECO reactors, comprising a string body and cleaning assemblies, a limiting wheel being disposed at an outer middle part of the rope body, and the cleaning assemblies being disposed at left and right ends of the string body. The present invention utilizes an anode string to replace the traditional anode plate, and due to the fluffy three-dimensional structure of the anode rope providing a relatively high specific surface area for the loading of an anodic catalytic coating, in a cross-section of the same width, the fluffy three-dimensional structure of the anode rope has a larger effective reaction surface area than a conventional anode plate, thereby achieving the purposes of improving reaction catalysis efficiency and reducing the cost of the ECO reactor. An original descaling apparatus can periodically clean the surface of the anode rope, achieving the purpose of increasing anodic reaction sites, promoting reaction catalysis efficiency, and extending the service life of the electrocatalytic oxidation reactor.

This water electrolysis electrode comprises a substrate and a catalyst portion. The catalyst portion includes Raney nickel particles and metal particles that contain nickel as a main component. The metal particles are in contact with the Raney nickel particles and include aluminum. The ratio of the total number of moles of aluminum to the total number of moles of nickel in the Raney nickel particles is greater than the ratio of the total number of moles of aluminum to the total number of moles of nickel in the metal particles.

The invention discloses a preparation method of a proton exchange membrane water electrolysis hydrogen production membrane electrode, and belongs to the technical field of proton exchange membranes, a catalyst carrier is prepared, S101, a polyimide membrane is inversely fixed in a magnetron sputtering vacuum coating chamber, a cavity cover of the magnetron sputtering vacuum coating chamber is closed, vacuumizing is performed, and a substrate is heated; and S102, argon is introduced into a cavity of the magnetron sputtering vacuum coating chamber, coating is started, the power of the bismuth metal target is set to be 0.2-0.5 kW, and the deposition time is 60-1800 s. In the invention, the physical vapor deposition method is utilized to load the catalyst on the surface of the metal oxide carrier with high specific surface area and ordered nanostructure, so that the exposure of active sites of the catalyst is increased, the dosage of the noble metal catalyst is reduced, and the bonding strength between the catalyst and the carrier is enhanced; the catalyst is not easy to separate from the surface of the carrier, and large-scale slurry agglomeration is avoided.

The invention relates to a composite electrode material of an A-C core-shell structure, and belongs to the technical field of electrode materials. In the core-shell structure composite electrode material, A is any one element, two elements, three elements, four elements or five elements selected from Mn, Ni, Co, Fe, Cu, Zn, Ru, Pd and Rh; c is RE < x > Ce < 1-x > O < 2 >, and RE is any one element or two elements selected from La, Pr, Nd, Sm and Gd; x is the mole fraction of RE. By improving the interaction between the oxide and the core multi-component alloy and the synergistic effect between the elements, the structural stability and the carbon deposition resistance of the electrode material under the high-temperature condition are remarkably enhanced.

The invention discloses a method for preparing a high-performance AEM water-electrolyzed hydrogen production membrane electrode, which comprises the following steps: respectively preparing an AEM water-electrolyzed hydrogen production anode and an AEM water-electrolyzed hydrogen production membrane cathode, then placing the AEM water-electrolyzed hydrogen production anode and the AEM water-electrolyzed hydrogen production cathode on two sides of an anion exchange membrane, and sealing edges to prepare the AEM water-electrolyzed hydrogen production membrane electrode, the preparation method comprises the following steps: mixing catalyst powder with a solvent to prepare catalyst prefabricated slurry, adding an anion exchange resin solution in batches, adding a hydrophobic binder to prepare catalyst slurry, coating the surface of a hydrophobic modified diffusion layer with the slurry, and finally coating the surface of the diffusion layer with the anion exchange resin solution to prepare the hydrophobic modified diffusion layer. And soaking in an organic solvent, and washing. According to the prepared AEM water electrolysis hydrogen production membrane electrode, on the basis that oxygen bubble retention can be reduced, the stability is improved, and meanwhile the activity of the membrane electrode is improved.

The invention relates to a catalyst for the hydrogen evolution reaction (HER) and methods for using the catalyst in a water-splitting process. A hydrogen evolution reaction (HER) electrocatalyst, and a method and use for preparing a HER electrocatalyst are disclosed. The method comprises the step of forming a two-dimensional electron gas (2DEG) interface at a heterojunction of at least one of two or more alternating layers of a first complex oxide and a second complex oxide, wherein the or each 2DEG interface exhibits a current density, corresponding to an intrinsic hydrogen evolution reaction (HER) activity that renders the 2DEG interface(s) suitable as an HER electrocatalyst for producing hydrogen (H2) from a water-based electrolyte by water electrolysis.

The invention discloses a sodium-doped copper bismuthate composite bismuth vanadate high-performance photoelectrode and a preparation method thereof, and belongs to the technical field of electrode materials. The sodium-doped copper bismuthate composite bismuth vanadate high-performance photoelectrode comprising the BiVO4 layer, the Na-CuBi2O4 layer and the nickel borate layer is provided, the sodium-doped copper bismuthate layer serves as a hole transport layer, the surface state is passivated, transport of carriers is promoted, recombination of surface charges is reduced, and the performance of the electrode is greatly improved; the nickel borate layer improves the photocorrosion defect of the material, and the stability is obviously improved; meanwhile, a heterojunction is formed between the BiVO4 layer and the Na-CuBi2O4 layer, so that the light absorption capacity of the BiVO4 is improved, the separation efficiency of photon-generated carriers is also enhanced, and finally, the high-performance photoelectrode with high stability, high carrier separation efficiency and high surface catalytic oxygen production efficiency is obtained.

In one aspect, the disclosure relates to a composition and a catalyst for substantially continuous CO2 capture and reduction from dilute CO2 sources including flue gas, wherein the flux of CO2 captured is substantially equal to the flux of CO2 reduction. The system can comprise integrated CO2 capture and reduction components. An exemplary system includes a composition of a catalyst and electrolytes. The catalyst can comprise supported or unsupported mesh electrodes that comprise Cu, a Cu—Al alloy, and / or a copper oxide. In one aspect, the system includes one or more membranes separating an anodic side from a cathodic side in the system, where the one or more membranes can be a bipolar membrane, an anion exchange membrane, or both, which can reduce or eliminate Cl2 production. In exemplary embodiments, the value-added products can be selected from CO, CH4, C2H4, C2H5OH, CH3COOH, CH3OH, C3H6, and / or H2.

The invention relates to a stainless steel-based anode membrane electrode loaded with a covalent organic framework as well as a preparation method and application of the stainless steel-based anode membrane electrode. The stainless steel-based anode membrane electrode comprises a stainless steel substrate and a covalent organic framework layer grown on the stainless steel substrate in situ, the covalent organic framework layer forms coordinate bonds with nitrogen atoms in the covalent organic framework layer through Fe, Ni and Cr metal elements dissolved out of the stainless steel substrate, and a honeycomb-shaped three-dimensional structure is constructed. During preparation, metal in the substrate is induced to be dissolved out at high temperature through a hydrothermal method and forms coordinate bonds with the porous organic polymer material, so that the metal grows on the surface of the stainless steel substrate, and a honeycomb-shaped three-dimensional structure is constructed. Compared with the prior art, the invention has the advantages of favorable electrolyte mass transfer performance, higher reaction bubble desorption speed and higher catalytic activity and stability, and can be used in the alkaline seawater electrolysis OER process.

The invention discloses a rare earth element doped stainless steel oxygen evolution electrode and a preparation method thereof, and belongs to the technical field of electrode preparation. The preparation method of the stainless steel oxygen evolution electrode comprises the steps that stainless steel with impurities removed serves as an anode and is placed in an alkaline solution with the concentration being 7-12 mol / L, cyclic voltammetry is adopted, stainless steel treated through cyclic voltammetry is obtained, and the potential window is-0.3 V to 1.5 V; the stainless steel is placed in an alkaline solution with the concentration being 1-2 mol / L and serves as an anode for electrolysis, and anodic oxidation stainless steel is obtained; the anodic oxidation stainless steel is placed in a cerium ion solution, a cyclic voltammetry method is adopted, the stainless steel serves as an anode to be treated, and a stainless steel oxygen evolution electrode is obtained through electro-deposition; wherein the potential window is-1.5 V to 1.0 V (+ / -0.5 V). The preparation method is simple, the cost is low, large-scale preparation is easy, long-time, high-temperature and other complex preparation processes are not needed, and when the electrode is used as an electrode for electrolyzing oxygen evolution in water, the electrode has excellent catalytic activity and shows huge application prospects in large-scale industrial hydrogen production through water electrolysis.

The invention belongs to the field of water electrolysis hydrogen production, and particularly relates to a membrane electrode and a blade coating preparation method and application thereof. The blade coating preparation method provided by the invention comprises the following steps: a) pressing a blade coating substrate to a certain thickness to obtain a pressed substrate; in the step a), the blade coating substrate is nickel foam, nickel felt or carbon paper; b) blade-coating the surface of the pressed substrate with catalyst slurry by using a blade coating machine, drying and hot-pressing to obtain a membrane electrode; in the step b), the ratio of the total mass of the catalyst powder and the binder in the catalyst slurry to the mass of the solvent is 1: (2-4); the distance between a scraper of the blade coater and the pressed substrate is 10-200 [mu] m; the blade coating speed ranges from 1 mm / s to 30 mm / s; the drying temperature is 50 to 90 DEG C. The membrane electrode is prepared by adopting a blade coating process under specific conditions, and the method has the advantages of good coating uniformity of the catalyst layer, high production efficiency and the like, and is particularly suitable for large-scale production of large-area membrane electrodes.

The invention relates to the technical field of water electrolysis hydrogen production, in particular to a solid oxide water electrolysis hydrogen production device. The device comprises a water supply assembly; the electrolytic cathode assembly comprises a multi-stage water preheater, a multi-stage water evaporator and a first heating part; and the SOEC electrolysis device is used for receiving the mixed gas heated by the first heating part to carry out an electrolytic reaction and sequentially conveying the first mixed gas generated after the electrolytic reaction to the first heating part, the multi-stage water evaporator and the multi-stage water preheater. According to the embodiment of the invention, the waste heat of the high-temperature gas generated by the electrolytic reaction is utilized to carry out multi-stage efficient heat management oriented design on the subsystems in the early stage of the electrolytic reaction, the overall structure is more compact, and compared with the existing system products in the market, the volume is smaller, the efficient multi-stage utilization of energy and the minimization of BOP auxiliary consumption are realized, and the energy consumption is reduced. And the comprehensive hydrogen production efficiency of the system is greatly improved.

The invention belongs to the technical field of material preparation, and discloses a preparation method of an alloy film loaded noble metal electrode for alkaline hydrogen evolution, and the preparation method comprises the following steps: firstly growing a nickel-iron alloy film on foamed nickel through constant-current deposition, then dipping in a ruthenium trichloride aqueous solution, reducing trivalent ruthenium ions into metal ruthenium under the action of the foamed nickel, and finally obtaining the metal electrode loaded with noble metal. The sample is anchored on the alloy film in the form of ruthenium nano-particle clusters, and the sample has ultralow ruthenium loading capacity. The obtained alloy film is smooth and uniform, uniform distribution of active sites is facilitated, electron transfer is accelerated, meanwhile, the ruthenium nanocluster with the proper size is loaded by controlling the dipping condition, the hydrogen evolution reaction is promoted, the hydrogen adsorption process is optimized through the synergistic effect between the ruthenium nanocluster and the nickel-iron alloy, and the hydrogen adsorption efficiency is improved. And the hydrogen evolution reaction kinetics of the material is improved. The obtained self-supporting catalyst has excellent performance which is superior to that of a Pt / C catalyst, still keeps excellent stability under industrial-grade large current density, and has a wide application prospect.

The invention provides catalyst slurry and a preparation method thereof, a membrane electrode and an electrolytic bath, and belongs to the technical field of water electrolysis hydrogen production, and the catalyst slurry comprises a catalyst, proton exchange resin, a dispersing agent and a solvent. Wherein the dispersing agent comprises at least one of polyvinylpyrrolidone, polyvinyl alcohol, polyethyleneimine, hexadecyl trimethyl ammonium bromide and hydroxyethyl cellulose. According to the catalyst slurry provided by the embodiment of the invention, sedimentation can be slowed down, the stability of the catalyst slurry is improved, the uniformity of the loading capacity of a catalyst in different membrane electrodes prepared from single-batch catalyst slurry is ensured, and the stability is improved.

A method of reducing carbon dioxide, with a catalyst including silver, copper, and melamine, where the catalyst includes 1-20 wt. % silver based on a weight of the copper, where particles of the catalyst have a polygonal shape and an average size of 0.5-3 μm, and where the copper and the silver form a complex with the melamine.

The invention belongs to the field of PET (polyethylene glycol terephthalate) plastic waste treatment, and particularly relates to preparation of a copper oxide-nickel hydroxide core-shell structure catalytic material and application of the copper oxide-nickel hydroxide core-shell structure catalytic material to preparation of high-added-value formic acid by upgrading electro-catalysis PET plastics, and the preparation method comprises the following steps: (1) placing a copper conductive substrate in an alkali etching mixed solution for alkali etching treatment, obtaining a conductive substrate on which a Cu (OH) 2 precursor grows; (2) placing the conductive substrate on which the Cu (OH) 2 precursor grows in a muffle furnace for heat treatment to obtain a conductive substrate on which CuO nanowires grow; and (3) placing the conductive substrate on which the CuO nanowire grows in a hydrothermal kettle, and obtaining the CuO-coated Ni (OH) 2-x core-shell structure catalyst through a hydrothermal method.

The invention discloses a titanium fibrofelt composite material and a PEM electrolytic tank containing the titanium fibrofelt composite material, and relates to the technical field of PEM electrolytic tanks. The titanium powder mixture is filled in the titanium fibrofelt base material on one side of the second surface of the titanium fibrofelt base material, and the particle size of the first titanium powder, the particle size of the second titanium powder, the mass ratio of the first titanium powder to the second titanium powder, and the porosity and the average pore size of the titanium fibrofelt base material are controlled to be within a proper range; the titanium fibrofelt composite material has the advantages that the titanium fibrofelt base material can be well filled with the titanium powder, and a pore structure with proper pore diameter and pore diameter distribution can be formed in the titanium fibrofelt base material, so that when the titanium fibrofelt composite material is used as an anode gas diffusion layer of a PEM electrolytic tank, the cooperative transmission effect of water and oxygen is good, the mass transfer loss in the operation process of the electrolytic tank is low, and the service life of the electrolytic tank is prolonged. The internal temperature of the electrolytic tank is easy to control.

The invention discloses a nanorod-shaped Ni / Ni3S2 / VN electro-catalytic material and a preparation method and application thereof.The preparation method comprises the steps that firstly, a nickel source is loaded on the surface of bacterial cellulose, and a Ni / Ni3S2 / VN electro-catalytic hydrogen evolution material with the nanorod-shaped morphology is prepared through a solid-phase sintering method; the bacterial cellulose is a pure natural biomass element, has no pollution to the environment, is green and environment-friendly, has a large number of carboxyl functional groups on the surface, can effectively complex free nickel ions in a solution as a template agent, and keeps good catalytic stability after being carbonized into carbon nanofibers, and Ni3S2 and VN are compounded, so that the catalytic performance of the carbon nanofibers is improved. According to the preparation method, a nanorod-shaped heterostructure is formed, part of Ni metal is reduced, all the components have a synergistic effect, the excellent electro-catalytic hydrogen evolution performance is shown in an alkaline environment, the preparation process is green, simple and convenient, and reaction conditions are easy to control.

Captured carbon dioxide, preferably carbon dioxide captured from emissions such as carbon dioxide from flue gas emissions, can be provided in the form of purified carbon dioxide after undergoing one or more purification processes, such that the purified carbon dioxide is capable of being utilized in the formation of one or more other economically viable chemicals, such as an oxalate salt and / or oxalic acid via an electrochemical reduction process. The electrochemical reduction process utilizing a modified cathode having a metal coating for the efficient and high yield of oxalate salt and / or oxalic acid. The economically viable chemicals derived from captured carbon dioxide capable of being utilized in other applications including the treatment of waste-products, such as in the neutralization of red mud and / or the extraction of rare earth minerals from neutralized red mud.

The invention belongs to the technical field of two-dimensional covalent organic framework materials, and particularly relates to a crystal orientation type covalent organic framework film, a preparation method and application. On the basis of an interfacial polymerization method, reaction kinetics are regulated and controlled by constructing a solvent buffer layer and introducing a reaction regulator, amino monomers containing pyridine nitrogen are orderly arranged on a water / oil two-phase interface through the cation-pi action after being protonated, aldehyde monomers dissolved in an oil phase are induced to have a Schiff base reaction with the amino monomers at the interface, and the pyridine nitrogen-containing amino monomers are obtained. And a crystal-oriented two-dimensional covalent organic framework film is formed at normal temperature. The self-supporting covalent organic framework film prepared by the method disclosed by the invention is controllable in thickness, has remarkable crystal orientation, is beneficial to carrier migration, and can be used as an electrocatalyst for electrocatalytic reduction of CO2.

The invention belongs to the field of electronic special gases, and particularly relates to a method for preparing octafluorocyclobutane through electrolysis of dichlorohexafluorocyclobutane. The method specifically comprises the following steps: S1, preparing an electrolyte: uniformly mixing potassium fluoride and anhydrous hydrogen fluoride according to a molar ratio of 1: 1-1: 15, performing dehydration treatment to obtain a mixed solution, and adding the mixed solution into an electrolytic bath; and S2, octafluorocyclobutane is prepared through electrolysis, specifically, dichlorohexafluorocyclobutane is dewatered and then added into the mixed solution to be evenly mixed, heating and electrifying are conducted, a crude product octafluorocyclobutane is obtained, the adding amount of dichlorohexafluorocyclobutane is 5-15% of the mass of the mixed solution, the heating temperature is 5-25 DEG C, the electrifying voltage is 4-20 V, and the current is 12-45 A. According to the method, the dichlorohexafluorocyclobutane is selected as the electrolysis raw material, octafluorocyclobutane is prepared through electrolysis, the conversion rate of the raw material is increased, waste of unreacted raw materials is reduced, and therefore the production cost is reduced.

The invention discloses a palladium-doped Ir-Sn oxide titanium anode with high catalytic activity and a preparation method of the palladium-doped Ir-Sn oxide titanium anode, and belongs to the technical field of electrolytic anodes. The anode comprises a titanium substrate, a TiO2-Ta2O5 intermediate layer and an Ir-Sn-Pd oxide catalyst layer, the molar ratio of Ir to Sn to Pd in the catalyst layer is (5-6): 3: (1-2), and the total metal ion concentration is 0.3 mol L. The preparation method is realized through titanium substrate pretreatment (sand blasting and etching), intermediate layer coating sintering (a TiCl4-TaCl5 solution) and catalyst layer circulating coating sintering (an H2IrCl6-SnCl4-PdCl2 mixed solution). The relatively cheap palladium element is introduced, the electron structure of the catalyst layer is optimized by utilizing the defect effect, the charge transfer resistance is reduced to 6.7 omegacm, and meanwhile, the iridium consumption is reduced by more than 30%. Experiments show that the cell voltage of the anode is stabilized at 0.95 V (the current density is 5Acm <-2 >), the accelerated life reaches 1630 hours, the coating binding force is 62N, and the corrosion rate in an acidic electrolyte is only 0.01 mm / year. Compared with a traditional iridium tantalum anode, the cost is reduced by 40%, and the overpotential in the oxygen evolution reaction is as low as 0.45 V.

A titanium material according to one aspect of the present invention contains 0.100-0.300% by mass of C, and contains compound particles containing titanium and carbon and having an average diameter of 400 nm or less. In a titanium material according to one aspect of the present invention, it is preferable that an A value, which is an index value for the ratio of TiC to Ti2C in compound particles containing titanium and carbon, is 0.10 or more. The titanium material according to one aspect of the present invention preferably contains Ti3C2. Another aspect of the present invention relates to a chemical device component comprising the titanium material according to the present embodiment. Another aspect of the present invention relates to a chemical device comprising the chemical device component of the present embodiment.

An electrocatalyst including: a first nanostructure including copper hydroxide; and a second nanostructure including a metal of Groups 2, 4, or 11 to 14 of the Periodic Table of Elements, other than copper, a metal oxide of the metal, a metal hydroxide of the metal, or a combination thereof, wherein the electrocatalyst is effective to catalyze conversion of carbon dioxide into a multicarbon compound.

The invention discloses a preparation method of a ruthenium oxide doped molybdenum oxide / nickel hydroxide full-pH water electrolysis catalyst, and belongs to the technical field of catalytic material preparation. The preparation method of the ruthenium oxide doped molybdenum oxide / nickel hydroxide comprises the following steps: firstly, mixing molybdenum salt with a sodium dodecyl benzene sulfonate aqueous solution, and then putting the mixture into a foamed nickel substrate; then carrying out hydrothermal reaction, and then carrying out calcination treatment in a reducing atmosphere; finally, the calcined product is soaked in a RuCl3 solution, and the self-supporting type heterojunction catalyst RuOx-MoO3 / Ni (OH) 2 is prepared. Through the composite structure design of the transition metal molybdenum / nickel-based material and the noble metal ruthenium oxide cluster, the technical bottlenecks of low activity and poor stability of the traditional ruthenium-based catalyst are effectively solved. The obtained catalyst shows excellent hydrogen evolution reaction (HER) activity and long-term stability in a wide pH range.

To provide a fuel cell that can be constructed thinly while ensuring sufficient thickness of the gas diffusion layer. [Solution] A fuel cell cell that generates electricity by the reaction of a reaction gas comprises a membrane electrode assembly having an electrolyte membrane and a catalyst layer, a gas diffusion layer laminated on the membrane electrode assembly and made of a porous metal, and a separator laminated on the gas diffusion layer and parallel to the plane direction of the membrane electrode assembly, wherein the gas diffusion layer has grooves through which the reaction gas flows on the separator side.

The invention discloses an anion exchange membrane electrode and a preparation method and application thereof, and belongs to the technical field of new energy material and catalytic electrode preparation, the method comprises the following steps: S1, preparing an anode catalyst slurry comprising a hydrophobic covalent organic framework material, an anode catalyst, an anion exchange ionomer and a solvent; s2, preparing a cathode catalyst slurry of which the components comprise a cathode catalyst, an anion exchange ionomer and a solvent; and S3, respectively spraying or coating the anode catalyst slurry and the cathode catalyst slurry on two side surfaces of an anion exchange membrane or a gas diffusion layer, and carrying out heat treatment to obtain the anion exchange membrane electrode. The method provided by the invention can solve the problems of large gas-liquid-ion three-phase mass transfer resistance, easy shielding of active catalytic sites by ionomers and unbalanced water management in the membrane electrode assembly in the existing AEMWE device.

The present invention relates to an electrode for electrolysis, a laminate, a wound body, an electrolyzer, a method for producing an electrolyzer, a method for renewing an electrode, a method for renewing a laminate, and a method for producing a wound body. An electrode for electrolysis according to one aspect of the present invention has a mass per unit area of 48 mg / cm2 or less and a force applied per unit mass-unit area of 0.08 N / mg·cm2 or more.

The invention relates to an oxygen evolution catalyst for hydrogen production through electrolysis of proton exchange membrane water, a membrane electrode and a preparation method of the membrane electrode, and the oxygen evolution catalyst is iridium oxide in a nanoparticle form and contains 2-2.5% of crystal water; the preparation method of the catalyst comprises the following steps: carrying out ultrasonic treatment on an iridium salt solution, mixing the iridium salt solution with magnesium sulfate and water, carrying out ultrasonic treatment, volatilizing a solvent, drying, carrying out ball milling to obtain powder, carrying out high-temperature calcination, dissolving with dilute acid, carrying out suction filtration with water and ethanol until the conductivity is less than 10 [mu] s / cm, carrying out vacuum drying to remove moisture, and grinding to obtain the catalyst. The membrane electrode comprises the catalyst powder prepared by the method and an anode catalyst layer formed by perfluorinated sulfonic acid resin; and the cathode catalyst layer is formed by Pt / C and perfluorosulfonic acid resin. The oxygen evolution catalyst provided by the invention has high activity and high stability, magnesium sulfate is adopted in the preparation method, and the oxygen evolution catalyst has the advantages of simple operation, low cost and the like.

The invention discloses an oxide semiconductor plane p / n superstructure and a preparation method thereof. According to the method, a latticed mask is formed on the surface of an oxide thin film based on a photoetching process, O2 atmosphere annealing (100-300 DEG C, 15-40 min) is combined, the local oxygen vacancy concentration of a mask covering area and an exposed area is precisely regulated and controlled, and precise in-situ conversion of a p type (oxygen-rich area) and an n type (oxygen-poor area) in a homogeneous material is achieved. The planar p / n superstructure breaks through the strict limitation of a traditional vertical multi-junction structure on material doping and interface quality, the width of a depletion region is expanded to the micron order through the p / n homojunction arrays alternately distributed in the plane, and the bulk recombination effect of photon-generated carriers is remarkably inhibited. According to the method, an innovative technical route of photoetching-assisted in-situ construction of the planar multi-junction photoelectrode is created, the method has the advantages of interface atomic-scale lattice matching, simple process, high compatibility, accurate and controllable space charge distribution and the like, and a technical foundation is laid for non-assisted solar water decomposition, research and development of self-driven optoelectronic devices and the like.