32 results about "Acid electrolyte" patented technology

The application discloses a preparation method and application of a zirconium dioxide loaded iridium oxide nanocluster oxygen evolution electrocatalyst. A mixed solution of zirconium salt, amide solvent and organic acid is prepared, and the mixed solution is kept at 120 DEG C for 24 hours; after cooling, the white product is separated, washed and dried. Then, the product and iridium salt are dispersed in a mixed solution of tetrahydrofuran and water, and sodium nitrate and potassium nitrate aqueous solution are added under stirring; after stirring, rotary evaporation is carried out at 60 DEG C, and the greenish powder obtained after drying is vacuum dried at 60 DEG C for 12 hours; the greenish powder is kept in a muffle furnace at 450 DEG C for 30 minutes, and then cooled in air; the greenish powder is washed with deionized water and anhydrous ethanol for multiple times, and finally vacuum dried at 60 DEG C for 12 hours. The zirconium dioxide loaded iridium oxide material based on oxygen overflow stable tetragonal zirconia can be specially applied to an electrocatalyst for an oxygen evolution reaction in an acidic electrolyte, has excellent oxygen evolution reaction activity, follows a lattice oxygen mechanism in the reaction process, and can realize an oxygen overflow effect from tetragonal zirconia to iridium oxide nanoclusters to stabilize the catalyst.

The invention belongs to the technical field of aqueous zinc ion batteries, and particularly relates to an acidic corrosion-resistant gel electrolyte as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing an acidic polymerizable monomer, a reinforcing component, a cross-linking agent and a photoinitiator in water to obtain a precursor solution, removing dissolved oxygen in the precursor solution, initiating cross-linking polymerization by adopting ultraviolet light to form precursor gel, and soaking the precursor gel in an electrolyte solution to obtain the acidic corrosion-resistant gel electrolyte. And the electrolyte solution is prepared by mixing soluble zinc salt and an additive in water. The acidic corrosion-resistant gel electrolyte prepared by the method improves the corrosion of the acidic electrolyte to the metal anode, so that the aqueous zinc ion battery matched with the metal anode shows excellent cycling stability and extremely high ionic conductivity, and the prepared total battery has excellent cycling stability and capacity retention ratio under high load.

The application relates to a preparation method of a platinum-based alloy rare earth metal oxide fuel cell anode catalyst, and relates to a preparation method of a platinum-based alloy oxide fuel cell catalyst, which aims to solve the technical problems of low catalytic activity and easy carbon monoxide poisoning of the existing methanol fuel cell anode catalyst. The method comprises the following steps: firstly, preparing a CeO2 catalyst carrier material by using a hydrothermal synthesis method; then mixing a corresponding Pt, Sn and Cu precursor solution used for preparing a PtSnCu alloy with the CeO2 catalyst carrier material to perform oil bath heating reaction; and finally, separating, washing and drying to obtain the catalyst PtSnCu / CeO2. The initial capacity of the catalyst in an acid electrolyte is 1010.5-1163.3 mA mg Pt ‑1 , and the capacity after 500 cycles is 680.65-820.4 mA mg Pt ‑1 , the retention rate is 67.4%-70.5%, and the catalyst can be used in the field of methanol fuel cells.

The utility model relates to the technical field of electrolytic copper foil, in particular to a protective device for electrolytic copper foil production, which comprises a protective cover, the protective cover is arranged on the upper portion of an electrolytic bath and used for protecting a cathode roller after the electrolytic copper foil is stripped, and the protective cover comprises a side end protective baffle and an upper end protective baffle which are connected. An acid liquid spraying pipe is arranged in the protective cover, the acid liquid spraying pipe is communicated with an acid electrolyte feeding pipe, the acid liquid spraying pipe is horizontally or obliquely arranged, at least one spraying hole is formed in the pipe wall of the acid liquid spraying pipe, and the spraying hole is formed in the upward pipe wall of the acid liquid spraying pipe. The cathode roller can prevent dust and other foreign objects from being in contact with the roller surface of the cathode roller, can control acid mist drifting to a certain degree, can shorten the contact time of the roller surface of the cathode roller and air, delays oxidation of the roller surface of the cathode roller, and reduces the appearance quality problem of copper foil caused by oxidation of the roller surface of the cathode roller.

The application belongs to the technical field of electrochemical energy storage and provides an electrolyte, a preparation method and a full vanadium redox flow battery. The electrolyte comprises an acidic electrolyte, vanadyl sulfate, an additive and water, the additive is 5-amino-2-naphthalenesulfonic acid, 3-aminobenzenesulfonic acid or 3-aminopropanesulfonic acid, the concentration of the acidic electrolyte in the electrolyte is 3.0-3.5 mol / L, the concentration of the vanadyl sulfate is 1.7-2.0 mol / L, and the concentration of the additive is 0.05-0.25 mol / L. The electrolyte can improve the high-temperature stability of VO2 + under the premise of ensuring good electrochemical performance.

The invention discloses an aluminum-sulfur battery electrolyte for promoting high-valence oxidation of sulfur. The aluminum-sulfur battery electrolyte comprises Lewis acidic electrolyte salt; an organic ligand, wherein the organic ligand and the Lewis acidic electrolyte salt form a room temperature ionic liquid or an ionic-like liquid; a chloride ion concentration regulating agent; the chloride ion concentration regulating agent is used for promoting elemental sulfur of the positive electrode of the battery to be subjected to electrochemical oxidation in the charging process of the aluminum-sulfur secondary battery so as to generate a sulfur oxidation product with the valence state of + 2. Meanwhile, the invention provides the aluminum-sulfur battery, high-valence electrochemical oxidation of the positive sulfur element in the charging process is remarkably promoted, and the specific discharge capacity is greatly improved, so that the aluminum-sulfur battery with high energy density is constructed.

The invention relates to the technical field of carbon dioxide electro-catalytic conversion, in particular to a carbon dioxide electrolytic tank for acidic electrolyte. The electrolytic tank comprises an epoxy resin glass fiber plate a, a cathode collector plate, a gas flow field plate, a silicone rubber gasket a, a cathode electrode, a cathode electrolyte plate, a silicone rubber gasket b, a proton exchange membrane, a silicone rubber gasket c, an anode electrolyte plate, a silicone rubber gasket d, an anode electrode, an anode collector plate and an epoxy resin glass fiber plate b which are arranged in sequence. According to the carbon dioxide electrolytic tank, the diffusion and reaction rate of carbon dioxide gas is increased through the gas flow field plate with the snake-shaped flow field, diffusion of carbon dioxide is promoted, carbonate deposition caused by local alkalinity on the electrodes is avoided, and electrolysis of carbon dioxide in high-concentration acidic electrolyte is achieved.

This invention discloses a bismuth-containing mixed-acid vanadium redox flow battery electrolyte, its preparation method, and its application. The desired modified battery electrolyte is obtained by adding a bismuth-containing additive to the mixed-acid vanadium redox flow battery electrolyte and then electrolyzing it. The concentration of the bismuth-containing additive in the modified battery electrolyte is 0.01 mol / L – 0.1 mol / L. The bismuth-containing additive is one or more of bismuth sulfate, bismuth formate, bismuth citrate, and bismuth tartrate, mixed in any proportion. The bismuth-containing mixed-acid vanadium redox flow battery electrolyte obtained by this invention can be used simultaneously in both the positive and negative electrode electrolytes, maintaining homogeneity between the two electrolyte systems and enabling rapid capacity recovery. Simultaneously, the mixed-acid electrolyte exhibits a triple synergistic effect of inhibiting chloride in the positive electrode, catalyzing in the negative electrode, and stabilizing vanadium ions at high temperatures, significantly improving the redox reaction kinetics and electrochemical reversibility during battery cycling, thereby achieving long-term stable battery operation.

The invention belongs to the technical field of metal materials, and particularly relates to a high-strength aluminum alloy decorative plate and a preparation method thereof. The preparation method of the aluminum alloy decorative plate comprises the following steps that an aluminum alloy base plate is immersed in a mixed acid electrolyte to be subjected to anodic oxidation treatment, and an anodic oxidation aluminum alloy plate is obtained; the anodized aluminum alloy plate is soaked in the hole sealing liquid, and the aluminum alloy decorative plate is obtained after drying; the mixed acid electrolyte is composed of lanthanum carbide, sulfuric acid, oxalic acid, dodecylbenzene sulfonic acid and water. The aluminum alloy decorative plate prepared by the invention has excellent mechanical properties, wear resistance and corrosion resistance.

The invention relates to an assembly for a fuel cell or electrolytic cell having an acidic, alkaline, solid oxide or molten salt electrolyte, equipped with an anti-corrosion coating, and to such a fuel cell or electrolytic cell having an acidic electrolyte, said assembly comprising a non-conductive substrate (31), and an anti-corrosion coating (32) deposited on at least one surface of the substrate (31), the anti-corrosion coating (32) comprising at least one main layer based on tantalum nitride doped with one or more doping elements selected from the group of transition metals and / or lanthanide series elements.

This invention relates to the field of electrochromic functional thin film preparation technology, and particularly to a Prussian blue / polyaniline composite electrochromic thin film, its preparation method, and its applications. The invention employs a constant current method to deposit a Prussian blue underlayer on the surface of a transparent conductive substrate; the obtained Prussian blue underlayer is pre-activated in a potassium-containing electrolyte; subsequently, a polyaniline surface layer is deposited in a polymerization solution containing aniline monomers and an acidic electrolyte using a segmented constant potential method; and finally, a post-conditioning treatment is performed to obtain the Prussian blue / polyaniline composite electrochromic thin film. By introducing a pre-activation step, a segmented deposition step, and a post-conditioning step, this invention improves the interfacial bonding, ion transport, and surface uniformity of the composite film, reducing agglomeration and scattering losses caused by continuous overgrowth of polyaniline. This results in a composite film with fast response, high transmittance adjustment capability, and good cycling stability, making it suitable for electrochromic display devices, smart windows, and transmittance-adjustable optical devices.

The application discloses a copper-doped bismuth-based material and a preparation method and application thereof. The method comprises the following steps: preparing a nanosheet-shaped copper-doped bismuth-based material through an electrochemical reduction method from a copper-doped bismuth-based organic layer. The copper-doped bismuth-based organic layer is prepared through a hydrothermal method. The copper-doped bismuth-based material is used as an electrocatalyst in the reduction of CO2 in an acidic system. The copper-doped bismuth-based material solves the problem of how to increase the electron-rich bismuth active site, and realizes the good efficiency of electrocatalytic CO2 reduction for formic acid in an acidic electrolyte.

The invention discloses a manganese-doped ruthenium oxide nano-catalyst, a preparation method thereof, an electrode and a water electrolysis hydrogen production device, and relates to the technical field of catalytic materials. The molar ratio of ruthenium to manganese in the catalyst is (5-9): 1; the average particle size of the catalyst is 6-8 nm. The manganese element is introduced to construct a stable composite structure, the structural stability is greatly improved while high intrinsic activity is maintained, in addition, good oxygen evolution and corrosion resistance are achieved, water oxidation of the acid electrolyte is driven at a low potential, good stability is maintained, and the service life of the acid electrolyte is prolonged. And the defect of poor stability of a commercial ruthenium oxide catalyst in an acid medium is overcome. The catalyst can well adapt to large-scale hydrogen production application in the future, and reaches the application standard of clean energy in the future. The preparation method belongs to one-pot molten salt synthesis, is simple, convenient and efficient in preparation, and provides a key material solution for an efficient and long-life proton exchange membrane water electrolysis hydrogen production technology.

The present disclosure relates to graphene oxide nanosheet comprising nitrogen incorporated into its structure and to an electrochemical process for producing graphene oxide nanosheets comprising nitrogen incorporated into its structure from carbon fibres. In one embodiment of the process, carbon fibres are immersed in an acidic electrolyte solution and subjected to an electric potential to induce electrochemical exfoliation, yielding nitrogen-incorporated graphene oxide nanosheets. The method enables controlled oxidation and tuneable material properties, including nanosheet thickness, lateral dimensions, and functionalization. Compared to conventional graphite-based methods, this process offers enhanced scalability, reproducibility, and environmental sustainability. The disclosure further includes a production system, and the use of the produced nanosheets in energy storage, composite materials, coatings, flexible electronics, and tribological applications.

The present invention discloses a weak acid electrolyte preparation device of a battery, and relates to the field of battery electrolyte preparation, and the weak acid electrolyte preparation device comprises: a mixed liquid bottle as a main reaction chamber for electrolyte preparation; the stock solution bottle is connected to the top of the mixed solution bottle in a penetrating manner and is used for containing high-concentration acid solution; the flow adjusting assembly comprises a valve head, the valve head is arranged at the intersection of the mixed liquid bottle and the stock solution bottle, and the valve head can be adjusted in a lifting mode; the mixing and stirring assembly comprises a stirrer for stirring the mixed liquid bottle; according to the invention, the frustum-shaped valve head is used for converting high-concentration acid liquor into a uniform thin film flowing along the inner wall, so that the heat dissipation area is greatly increased, and local hot spots are eliminated; meanwhile, a spherical stirring head and a reverse inclined blade which are in reciprocating motion are matched to drive a bottom layer solution to roll upwards along the wall and generate violent reverse mass transfer exchange with a descending acid liquid film, so that deep dilution is completed.

The application discloses an organic negative electrode material for a hydrogen ion battery, which is prepared by the following steps: reacting 2,3-dichloronaphthoquinone with a sulfur source, refluxing the reaction in a solvent for 2-12 hours, filtering, collecting a filter cake and drying to obtain DTT; assembling the hydrogen ion battery by taking the DTT as an anode and taking MnO2 as a cathode in an acidic electrolyte. The application aims to solve the problems of high pollution, high electrode cost and short service life of the existing hydrogen ion battery.

The invention discloses a novel acidic electrolytic water oxygen evolution reaction electrocatalyst and a preparation method thereof.The electrocatalyst is a novel material with foamed nickel as a substrate, and the preparation method of the material comprises the steps that pretreated foamed nickel is soaked in a RuCl3 aqueous solution; taking out after a certain period of time, dipping in an ammonia water solution of potassium permanganate and dopamine hydrochloride for reaction, and finally roasting in an inert atmosphere. According to the method for preparing the electrocatalyst for the acidic water electrolysis oxygen evolution reaction, Ru is uniformly dispersed in the foamed nickel substrate and is low in loading capacity, in the 0.5 M H2SO4 acidic water electrolysis oxygen evolution reaction, under the current density of 10 mA cm <-2 >, the overpotential is only 174 mv, and the stability exceeds 44 h. According to the invention, the problems of poor activity, poor stability and high cost of the OER catalyst in the process of hydrogen production by electrolyzing water with an acidic electrolyte are solved.

The invention belongs to an electrolyte for a redox flow battery, and particularly relates to a supporting electrolyte of a polybasic mixed acid electrolyte and an all-vanadium redox flow battery. The electrolyte comprises a positive electrode electrolyte and a negative electrode electrolyte, and the positive electrode electrolyte and the negative electrode electrolyte respectively comprise a basic component and an additive component; the basic components comprise sulfate ions, iodide ions, hydrogen ions and vanadium ions; the addition component comprises one or two of chloride ions and bromide ions; the electrolyte ion molar concentration meets the following relation: 0.5 M < = c (H +) < = 7.2 M; 1.6 M < = c (Vn +) < = 2.7 M; 0.01 M < = c (I-) < = 2.0 M; 0.5 M < = c (SO4 < 2->) < = 6.05 M; 1.16 < = [c (SO4 < 2->) + c (Cl-) + c (Br-) + c (I-)] / c (Vn +) < = 4.75; 0.0038 < = [c (Cl-) + c (Br-) + c (I-)] / c (SO42-) < = 21.8. According to the invention, at least one of I <-> or ClI, BrI and ClBr is introduced into the electrolyte, and the molar concentration of each ion in the electrolyte is limited through a functional expression according to the interaction of active substances, so that the comprehensive electrochemical performance of the electrolyte is improved on the basis of fully utilizing the capacity provided by vanadium.

The application discloses a method for improving color uniformity of an anodic oxidation film layer on a titanium crystal flower surface, relates to the field of titanium and titanium alloy surface treatment, and aims at the problem of color unevenness caused by the inconsistent local film forming rate and uneven film thickness of the titanium crystal flower surface due to the grain orientation difference. The method comprises the following steps: S1, providing a titanium crystal flower product; S2, placing the titanium crystal flower product in an acid electrolyte to perform first-step anodic oxidation; and S3, after the first-step anodic oxidation, re-clamping the titanium crystal flower product to perform second-step anodic oxidation. The method does not need to perform complicated modification on the existing anodic oxidation equipment, nor needs to introduce an external additive, and can effectively improve the color consistency of the anodic oxidation film layer on the titanium crystal flower surface by optimizing a voltage application path, and is suitable for industrial application.

A method for electrochemically converting carbon dioxide (CO2) to methanol in an acidic electrolyte environment (pH<6) is provided. The method involves the use of an electrochemical cell equipped with a cathode modified by a metal phthalocyanine-based molecular catalyst that is functionalized with covalently attached cationic iminium groups. These functional groups create a hydrophobic and aerophilic interface that enhances local carbon monoxide (CO) availability at the catalyst surface while simultaneously suppressing the competing hydrogen evolution reaction (HER). By applying an appropriate electrical potential, the electrochemical cell effectively performs selective and efficient CO2-to-methanol conversion under strongly acidic conditions.

A method of forming a gas diffusion material layer (GDL) includes depositing a metallic layer over a porous polytetrafluoroethylene (PTFE) layer, oxidizing 3,4-ethylenedioxythiophene (EDOT) over the metallic layer, and forming a porous poly(3,4-ethylenedioxythiophene) (PEDOT) layer over the porous PTFE layer. The porous PEDOT layer directly contacts the porous PTFE layer. The resulting PEDOT-PTFE GDL combines electrical conductivity with hydrophobicity and gas permeability, enabling efficient electrochemical conversion processes, particularly carbon dioxide reduction reaction. The PEDOT-PTFE GDL can be used in electrochemical systems comprising an electrochemical reactor and a catalyst layer supported on the PEDOT-PTFE GDL, to provides stable, selective, and efficient CO2 reduction performance across alkaline, neutral, and acidic electrolytes. Compared with carbon-based GDLs, the PEDOT-PTFE electrodes exhibit reduced hydrogen evolution, high product selectivity, and durability under high current operation.

The invention provides an electrocatalytic carbon dioxide reduction method. The method comprises the following steps: introducing carbon dioxide into a working electrode, and carrying out electrocatalytic carbon dioxide reduction in electrolyte; wherein the electrolyte is an acidic electrolyte; wherein a tin-based catalyst is loaded on the working electrode, and the molecular formula of the tin-based catalyst is SrSnO3. By means of the electrocatalytic carbon dioxide reduction method, electrocatalytic carbon dioxide reduction can be conducted stably and efficiently for a long time.

The invention belongs to the technical field of electrochemical energy storage, and provides an electrolyte, a preparation method and an all-vanadium redox flow battery, the electrolyte comprises an acidic electrolyte, vanadyl sulfate, an additive and water, the additive is 5-amino-2-naphthalene sulfonic acid, 3-aminobenzene sulfonic acid or 3-aminopropanesulfonic acid; in the electrolyte, the concentration of the acidic electrolyte is 3.0 to 3.5 mol / L, the concentration of the vanadyl sulfate is 1.7 to 2.0 mol / L, and the concentration of the additive is 0.05 to 0.25 mol / L. The electrolyte can improve the high-temperature stability of VO < 2 + > on the premise of ensuring good electrochemical performance.

The invention provides noble metal-free electro-catalyst compositions for use in acidic media, e.g., acidic electrolyte. The noble metal-free electro-catalyst compositions include non-noble metal absent of noble metal. The non-noble metal is non-noble metal oxide, and typically in the form of any configuration of a solid or hollow nano-material, e.g., nano-particles, a nanocrystalline thin film, nanorods, nanoshells, nanoflakes, nanotubes, nanoplates, nanospheres and nanowhiskers or combinations of myriad nanoscale architecture embodiments. Optionally, the noble metal-free electro-catalyst compositions include dopant, such as, but not limited to halogen. Acidic media includes oxygen reduction reaction (ORR) in proton exchange membrane (PEM) fuel cells, and direct methanol fuel cells and oxygen evolution reaction (OER) in PEM-based water electrolysis and metal air batteries, and hydrogen generation from solar energy and electricity-driven water splitting.

The invention belongs to the technical field of water-based zinc ion batteries, and relates to a preparation method of a high-performance long-circulation water-based zinc ion battery, which is characterized in that a bismuth selenide (Bi2SeO2) cathode material is prepared by a simple and mild one-step oil bath method and is combined with an ammonium iodide modified electrolyte, so that the construction of the high-performance long-circulation water-based zinc ion battery is realized. The modified electrolyte comprises a solvent, an electrolyte and an additive, wherein the dosage of the ammonium iodide additive is 0.03-0.15 M. The interaction among ions in the modified electrolyte obviously improves the proton affinity of the weakly acidic electrolyte, and regulates and controls the interface stability of the electrode and the electrolyte. Meanwhile, the ammonium iodide regulates and controls the redox reaction of the Bi2SeO2 cathode, co-intercalation of NH4 < + >, Zn < 2 + > and H < + > is achieved, and the reversible redox reaction of I <-> is activated. In addition, introduction of ammonium iodide induces the zinc surface passivation layer to grow in the vertical direction, and formation and growth of zinc dendrites of the zinc anode can be effectively inhibited. Therefore, the high-performance long circulation of the aqueous zinc ion battery is realized through the cooperation of the design of the cathode intrinsic material and the electrolyte, and the application of the zinc ion battery in the field of energy storage is expanded.

The invention relates to a method for preparing hydrogen peroxide in an acidic electrolyte by using a bimetallic manganese catalyst. According to the preparation method, a two-electron oxygen reduction reaction is carried out in an acidic electrolyte in the presence of a bimetallic manganese catalyst to obtain hydrogen peroxide. According to the preparation method of the hydrogen peroxide, electrochemical synthesis of the hydrogen peroxide can be carried out in the acidic electrolyte under the industrial-grade current density, and the activity and durability of the catalyst are good.

A catalyst may include ruthenium, oxygen, and a dopant, wherein the dopant comprises a transition metal. The catalyst may further include iridium. A method of making the catalyst may include impregnating ruthenium precursors and dopant precursors on a support, reducing the ruthenium precursors and the dopant precursors to obtain alloy nanoparticles supported on the support and including an alloy of ruthenium and the dopant, annealing the alloy nanoparticles and the support to remove the support and to convert the alloy nanoparticles to an intermediate mixed oxide including ruthenium, oxygen and the dopant, and leaching the intermediate mixed oxide to remove unstable dopant and obtain the catalyst.

The invention provides a composite carbon nanomaterial / polyaniline hollow microsphere, which is prepared by the following steps: dispersing a carbon nanomaterial in an acidic electrolyte aqueous solution of aniline until the final concentration is 0.3-2 mg / L, then adding an organic solvent, and homogenizing to obtain an oil-in-water type Pickering emulsion with the stable carbon nanomaterial, thereby obtaining the composite carbon nanomaterial / polyaniline hollow microsphere with the stable oil-in-water type Pickering emulsion with the stable oil-in-water type Pickering emulsion with the stable oil-in-water type Pickering emulsion. Injecting into an anode chamber of a three-electrode electrolytic bath, standing and splitting phases to obtain a high internal phase emulsion layer; carrying out an electropolymerization reaction on the emulsion system at 8-30 DEG C and at a constant current of 0.1-10 mA, and terminating the reaction when the voltage reaches 1 V vs SHE; and carrying out post-treatment on the obtained reaction liquid to obtain the composite nano carbon material / polyaniline hollow microspheres. According to the preparation method, electrochemical polymerization is adopted to replace traditional chemical oxidation polymerization, use of dangerous oxidizing agents is avoided, the independent composite carbon nanomaterial / polyaniline hollow microspheres are prepared in one step in batches, and the composite carbon nanomaterial / polyaniline hollow microspheres have excellent electron conduction capacity, abundant reaction interfaces, efficient pseudocapacitance characteristics and intelligent stimulation response behaviors.

The application discloses a method for preventing hard alloy waste from hardening in electrolysis, which comprises the following steps: providing an electrolytic tank, adding electrolyte into the electrolytic tank, immersing the hard alloy waste into the electrolyte, and performing electrolysis by taking the hard alloy waste as an anode and an inert electrode as a cathode; wherein the electrolyte comprises the following components with the following concentrations: 100-350 g / L of acid electrolyte, 0.5-2.5 g / L of dispersant, 0.1-1 g / L of non-ionic surfactant, 3-10 g / L of antioxidant and water. The method can overcome the hardening problem in the electrolysis process.

The invention relates to the technical field of hydrogen peroxide sensors, in particular to a hydrogen peroxide sensor and a preparation method and application thereof. B, soaking the pretreated electrode in aniline-acid electrolyte, and obtaining a polyaniline modified electrode by using an electrochemical polymerization method; c, the polyaniline modified electrode is soaked in a platinum precursor solution, and a grape platinum nanoparticle-polyaniline composite electrode is obtained through an electrochemical method; and D, carrying out shape modification on the vibrio platinum nanoparticles in the vibrio platinum nanoparticle-polyaniline composite electrode by adopting a polarized square wave voltammetry to form a cubic platinum nanoparticle-polyaniline composite electrode, thereby obtaining the hydrogen peroxide sensor. According to the preparation method of the hydrogen peroxide sensor, the preparation method is simple and high in operability, and the obtained hydrogen peroxide sensor shows high detection sensitivity, high anti-interference performance and high performance stability on hydrogen peroxide.