984 results about "Hydrogen evolution" patented technology

The invention discloses a zinc-bromine flow battery multifunctional negative electrode electrolyte and a preparation method thereof, and belongs to the technical field of electrochemical energy storage, and the method comprises the following steps: uniformly stirring and mixing a solvent, deionized water and a cosolvent, adding an electrolyte, stirring until the electrolyte is completely dissolved, then adding a supporting electrolyte and a negative electrode additive, stirring until the supporting electrolyte and the negative electrode additive are completely dissolved, and obtaining the zinc-bromine flow battery multifunctional negative electrode electrolyte. The multifunctional negative electrode electrolyte of the zinc-bromine flow battery is obtained; the negative electrode cosolvent is dimethylformamide; and the negative electrode additive is at least one of saponin and cinnamyl aldehyde. Saponin molecules are adsorbed on the surface of the zinc electrode, and electronegative carboxyl groups of the saponin molecules form an electrostatic repulsion net in an electric double layer, so that zinc ions are forced to be uniformly dispersed, local ion concentration hot spots are eliminated, and dendritic crystal nucleation is inhibited from the source. In cinnamyl aldehyde, the strong electronegativity of oxygen atoms and the electronegativity of aldehyde oxygen are far higher than those of hydrogen, so that electrons are strongly attracted, adjacent carbon atoms are positively charged, polar adsorption sites are formed, the hydrogen evolution reaction is effectively inhibited, and the stability and the cycle life of the battery are greatly improved.

The invention provides a synchronous electrochemical test and hydrogen evolution test experimental device and method, and belongs to the field of metal corrosion research. The experimental device provided by the invention comprises a hydrogen evolution test module, an electrochemical test module and a control system module, and the control system module controls the hydrogen evolution test module and the electrochemical test module to work through circuit connection. By combining the hydrogen evolution test and the electrochemical test, the automatic accurate measurement of the hydrogen evolution amount in the metal corrosion process can be realized, the measurement of the corrosion rate, the corrosion potential and the charge transfer amount in the oxidation-reduction reaction can also be realized, and the problems of poor sustainability and low precision of the traditional hydrogen evolution test method are avoided; the hydrogen evolution test data and the electrochemical test data are automatically obtained while one-time sample preparation is realized.

The invention relates to a liquid flow battery electrolyte storage device, and relates to the technical field of liquid flow battery electrolytes.The liquid flow battery electrolyte storage device comprises a tank shell and a heat exchange pipe, a spiral storage pipe barrel arranged in the vertical direction is arranged in the tank shell, electrolyte is arranged in the storage pipe barrel, the storage pipe barrel is connected with a liquid pump, the heat exchange pipe is spiral, and the heat exchange pipe is connected with the liquid pump. The storage pipe barrel is arranged vertically in a spiral mode and arranged outside the storage pipe barrel in a sleeving mode, heat exchange liquid is arranged in the heat exchange pipe, the heat exchange pipe is connected with a liquid supply circulating device, the flowing direction of the electrolyte is opposite to that of the heat exchange liquid, the storage pipe barrel is vertically arranged in a spiral mode, the electrolyte in the storage pipe barrel can form ordered layering in the storage pipe barrel, and therefore the heat exchange effect is improved. According to the utility model, the generation of a flowing dead zone is avoided, the occurrence of a side reaction, namely a hydrogen evolution reaction, caused by the mixing of two different ions is also reduced, the heat exchange area is increased, countercurrent flow heat exchange is realized, and the heat exchange efficiency of the device is further ensured.

This application relates to the field of hydrogel electrolyte technology, specifically disclosing a modified sodium alginate crosslinked hydrogel electrolyte, its preparation method, and its applications. This application reduces environmental toxicity and pollution by introducing modified sodium alginate as a crosslinking agent into the hydrogel electrolyte. The interaction between sodium alginate and zinc ions inhibits zinc dendrite formation, regulates the interfacial growth between the negative electrode and the electrolyte, and thus extends battery life; it also has a certain inhibitory effect on hydrogen evolution reaction. This application can prepare the modified sodium alginate crosslinked hydrogel electrolyte using a simple free radical polymerization method. Furthermore, compared to conventional aqueous batteries, the hydrogel electrolyte can better control the interfacial growth of the positive and negative electrodes.

The invention discloses a Ce-doped CoP / NiCoP-coated NM self-supporting structure electrode and a preparation method and application thereof, the electrode takes a pretreated nickel net as a conductive substrate, a two-step method combining pulse electrodeposition and constant potential deposition is adopted, a compact NiCoP bottom layer and a Ce-doped CoP outer layer are constructed in sequence, and a CoP / NiCoP heterojunction structure with a three-dimensional coralline open morphology is formed. The method is mild in process, green, simple and convenient, and a traditional high-temperature phosphating step is abandoned. The prepared self-supporting electrode combines the charge regulation advantage of a heterojunction interface, the Ce-doped electronic structure optimization effect and the mass transfer advantage of a three-dimensional porous structure, so that the self-supporting electrode has extremely high hydrogen evolution catalytic activity, strong bonding force with a substrate and excellent long-period operation stability.

The invention discloses a composite cathode and anode plate made of a lead-carbon composite material, the composite cathode and anode plate comprises a current collector, a transition layer and an active layer which are compounded in sequence, the transition layer tightly coats the outer surface of the current collector, the active layer tightly coats the outer surface of the transition layer, and the composite cathode and anode plate is prepared by the following method: S1, preparing the composite cathode and anode plate; raw material pretreatment: placing the carbon material in a vacuum oven; according to the invention, the structural design of the composite negative plate and the preparation process are integrated, so that accurate matching of the raw material ratio and the process parameters is realized, and many defects of the traditional electrode are effectively solved; the three-layer gradient structure improves the interface bonding force, and delamination is avoided; the optimized raw material system and the preparation process have a synergistic effect, so that the hydrogen evolution overpotential is remarkably improved, the internal resistance is reduced, the cycle life is prolonged, the low-temperature performance is improved, the energy density is improved, and a reliable technical scheme is provided for the application of the lead-acid storage battery in the high-end field.

A surface-modified catalyst, a multilayer cathode and a system for the electrochemical reduction of carbon dioxide in an acidic medium releasing protons are described. More particularly, the surface-modified catalyst, the multilayer cathode and the system comprise least one heterocyclic organic molecule preventing protons from accessing an active site on a surface of the cathode catalyst material to decrease an hydrogen evolution reaction, as compared to the absence of said heterocyclic organic molecule. The use of the surface-modified catalyst, the multilayer cathode and the system for the production of multicarbon products as well as their processes of manufacturing are also described. Finally, also described are methods for electrochemical production of a multicarbon product using the multilayer cathode and the system.

The invention is suitable for the technical field of water electrolysis hydrogen production, and provides an alkyne-rich carbon-ruthenium nickel alloy catalyst and a preparation method and application thereof. The preparation method comprises the following steps: simultaneously adding a ruthenium salt solution, a nickel salt solution and an organic molecule solution into an alkyne-enriched carbon dispersion liquid for reaction; and carrying out centrifugation, cleaning and vacuum drying treatment on the reacted mixed solution to obtain the alkyne-rich carbon-ruthenium nickel alloy catalyst. According to the invention, the acetylene-rich carbon-ruthenium nickel alloy catalyst uniformly loaded with ruthenium nickel (RuNi) clusters is successfully prepared. In the performance evaluation of hydrogen production by water electrolysis in a simulated seawater environment, the material shows excellent hydrogen evolution activity as a cathode catalyst. Experimental results show that under the applied potential of-0.6 V (relative to a reversible hydrogen electrode, RHE), the absolute value of the current density can reach 0.847 A cm <-2 > to 0.896 A cm <-2 >. The invention provides a feasible material solution for developing a high-performance water electrolysis hydrogen production catalyst suitable for a complex water quality environment.

The invention belongs to the technical field of hydrolysis hydrogen production, and particularly relates to a preparation method of a CoPx-CeO2 loaded platinum catalyst with a core-shell structure and application of the CoPx-CeO2 loaded platinum catalyst in seawater electrolysis hydrogen production. A Co (CO3) 0.5 (OH) nanorod precursor is prepared on foamed nickel through a hydrothermal method and then calcined to obtain CoPx, a CeO2 film is electrically deposited to obtain a CoPx-CeO2 composite carrier, and platinum is impregnated and loaded to obtain the CoPx-CeO2-Pt catalyst. The catalyst shows excellent hydrogen evolution catalytic activity in seawater, and the CoPx-CeO2 composite carrier prevents Pt nano-particles from being agglomerated through interaction of metal carriers, so that the atom utilization rate of Pt is increased. Meanwhile, the CeO2 film actively enriches OH <-> in an alkaline electrolyte to construct a local high-alkalinity microenvironment on the surface of the catalyst, Cl <-> in seawater is prevented from getting close to an active site corroding the catalyst through electrostatic repulsion, and the stability and durability of the catalyst are improved.

A preparation method of a high-activity nitrogen-doped carbon-loaded CoRu nano-alloy is used for enhancing pH universal hydrogen evolution, and is characterized by comprising the following steps: dissolving dopamine hydrochloride in an aqueous solution containing H2O2 and CuSO4. 5H2O, and magnetically stirring to form a uniform mixture; and pre-wetting carbon cloth with ethanol, immersing the pre-wetted carbon cloth in the dopamine solution for 10 minutes, taking out the pre-wetted carbon cloth, washing the pre-wetted carbon cloth with deionized water for three times, and carrying out vacuum drying to obtain the polydopamine modified carbon cloth marked as PDA / CC. And immersing the obtained PDA / CC into 20 mL of aqueous solution containing Co (NO3) 2.6 H2O and RuCl3 for 6 hours to realize metal ion adsorption. And washing and drying a sample, and calcining the sample in a tubular furnace at 700 DEG C in an N atmosphere for 2 hours to obtain the self-supporting nitrogen-doped porous carbon-loaded CoRu alloy material which is recorded as CoxRu (at) CN / CC. Through a synthesis strategy based on active ion capture and in-situ carbon thermal reduction, and through construction of a nitrogen-doped carbon cobalt ruthenium alloy nanostructure and a strong metal-carrier synergistic effect, efficient hydrogen overflow and establishment of stable active sites are realized; therefore, the performance bottleneck that high activity and high stability of a traditional electrocatalyst in a wide pH range are difficult to cooperate is broken through.

The invention relates to the technical field of batteries, in particular to a low-hydrogen-evolution graphene material for a lead-acid battery and a preparation method thereof.The method comprises the steps that firstly, ethidene diamine is grafted to the surface of graphene oxide through a carbodiimide / active ester method, and aminated graphene is obtained; performing heat treatment in a nitrogen / ammonia gas atmosphere to realize nitrogen doping; compounding with titanium dioxide, and carrying out hydrothermal reaction to form a stable structure; then, sequentially grafting imidazolium silane and perfluorodecyl silane to carry out hydrophobic modification; and finally, stabilization and low-temperature re-nitridation curing are carried out through titanium tetrabutoxide. The graphene material prepared by the method endows the battery with excellent performance, and is low in direct-current internal resistance and high in capacity retention ratio.

The invention belongs to the technical field of electrochemical energy storage, and provides a negative electrode electrolyte, a preparation method thereof and a zinc-bromine flow battery. The negative electrode electrolyte comprises the following components: zinc bromide, supporting electrolyte, a negative electrode additive and water, and the negative electrode additive comprises malic acid; and the concentrations of the zinc bromide, the supporting electrolyte and the malic acid in the negative electrode electrolyte are 2.0 to 2.5 mol / L, 2.0 to 3.0 mol / L and 0.02 to 0.04 mol / L respectively. Zinc dendrites and hydrogen evolution reaction are effectively inhibited, and cooperative improvement of coulombic efficiency, voltage efficiency and energy efficiency is achieved. Therefore, the malic acid is introduced into the negative electrode electrolyte, so that the zinc dendrite and hydrogen evolution reaction in the zinc-bromine flow battery can be effectively inhibited, and the cooperative improvement of coulombic efficiency, voltage efficiency and energy efficiency is realized.

The invention relates to the technical field of nano-catalysts, and discloses a preparation method and application of a ZnxCd1-xS nano-catalyst rich in sulfur vacancies, the preparation method of the ZnxCd1-xS nano-catalyst rich in sulfur vacancies is characterized by comprising the following steps: S1, mixing cadmium salt, zinc salt and thiourea in deionized water to obtain a mixed solution; and S2, putting the mixed solution into a reaction kettle for heating reaction, cooling, collecting a reaction product, washing the reaction product with deionized water, and drying the washed reaction product to prepare the ZnxCd1-xS nano-catalyst. The ZnxCd1-xS nano-catalyst synthesized by the method is uniform in dispersion, uniform in size and regular in morphology, the morphology of the obtained ZnxCd1-xS nano-catalyst is evolved into a litchi-shaped transition state with a rough surface from a spherical shape along with the rise of the reaction temperature, and then a pine tree-shaped morphology with the regular morphology is generated. In addition, the prepared catalyst is rich in certain sulfur vacancies, and the performance is remarkably improved when the catalyst is applied to the field of photocatalytic hydrogen evolution.

The invention provides an alkaline hydrogen evolution electrocatalyst and a preparation method and application thereof.The alkaline hydrogen evolution electrocatalyst comprises a carrier and an active component, the carrier comprises a reduced graphene oxide layer and a rare earth element doped transition metal oxide layer which are sequentially stacked, and the active component comprises precious metal; the active component is loaded on the surface of one side, far away from the reduced graphene oxide layer, of the rare earth element doped transition metal oxide layer. According to the alkaline hydrogen evolution electrocatalyst provided by the invention, the transition metal oxide layer doped with the noble metal and the rare earth element can form a synergistic catalysis interface, and the reduced graphene oxide layer is used as a carrier substrate, so that a continuous conductive network can be constructed to guarantee electron transmission, and a loaded material can be dispersed and supported through a lamellar structure of the reduced graphene oxide layer; through the synergistic effect of the components and the structure, the hydrogen evolution reaction activity and stability of the catalyst under the alkaline condition are remarkably improved.

This invention provides a method for preparing (002) crystal-plane oriented metallic zinc and its application. The invention employs a two-electrode electrochemical deposition technique, using iron foil, titanium foil, or copper foil as the working electrode, commercial zinc foil as the counter electrode, and an aqueous zinc salt solution as the electrolyte. Constant current density discharge deposition is used to deposit (002) crystal-plane oriented metallic zinc on the working electrode; the constant current density is 50 mA cm⁻¹. ‑2 ~200 mA cm ‑2 The (002) crystal-plane oriented metallic zinc prepared by this invention can be used in rechargeable zinc-ion batteries. The two-electrode electrolytic cell device used in the preparation of metallic zinc in this invention is simple, the preparation process is straightforward, and the preparation method is more universal. The (002) crystal-plane oriented metallic zinc prepared according to the method of this invention can suppress zinc dendrite growth and hydrogen evolution, thereby improving the service life of rechargeable zinc-ion batteries.

The invention relates to an amorphous reconstruction hydrogen evolution catalyst and a preparation method and application thereof. The amorphous reconstruction hydrogen evolution catalyst is of a heterostructure, the surface layer of the amorphous reconstruction hydrogen evolution catalyst is a transition metal oxide, and the inner layer of the amorphous reconstruction hydrogen evolution catalyst is a transition metal boride or a transition metal boron-phosphorus co-doped compound; the transition metal oxide, the transition metal boride and the transition metal boron-phosphorus co-doped compound are all in an amorphous state; transition metals in the amorphous state reconstruction hydrogen evolution catalyst are at least two of Fe, Co, Ni, Ce, Cu, Mn, V, W and Mo.

The invention provides a cobalt tungstate and bismuth vanadate photocatalytic material as well as a preparation method and application thereof, and belongs to the technical field of material synthesis and photocatalytic application. In the presence of monoclinic-phase decahedron BiVO4, CoWO4 nanoparticles grow in situ on an electron-rich (010) crystal face of the CoWO4 nanoparticles through a hydrothermal reaction, and the cobalt tungstate and bismuth vanadate photocatalytic material is obtained. According to the cobalt tungstate and bismuth vanadate photocatalytic material, a simple hydrothermal method is adopted, in the synthesis process, a CoWO4 precursor is guided by electrostatic interaction, preferentially adsorbed and subjected to nucleation growth on the (010) crystal face of BiVO4, a compact chemical bonding interface is constructed through selective growth, the charge migration distance is effectively shortened, and the photocatalytic performance of the material is improved. The interface charge transfer resistance is reduced to the greatest extent, and the formed binary photocatalyst has excellent effects on photocatalytic hydrogen evolution and tetracycline degradation.

The application belongs to the technical field of materials, and provides a preparation method of transition metal selenide / metallic phase molybdenum disulfide in-plane heterostructure and application thereof. The method is to take metallic phase molybdenum disulfide nanosheet as a main body, embed 2-5 nm transition metal selenide nanoclusters into the interior of the metallic phase molybdenum disulfide nanosheet, and make the two be in the same plane. The specific steps are as follows: a transition metal sulfide in-plane heterostructure prepared by a two-step hydrothermal method is used as a precursor, a gas phase selenization method is used to convert the in-plane transition metal sulfide into its selenide under the premise of retaining the metallic phase molybdenum disulfide, and a transition metal selenide / metallic phase molybdenum disulfide in-plane heterostructure is obtained. The prepared transition metal selenide / metallic phase molybdenum disulfide in-plane heterostructure powder and self-supporting electrode are used as a water electrolysis hydrogen evolution catalyst. The preparation process is simple, the price is low, and the method is green and environment-friendly. The material has super-high catalytic activity as the water electrolysis hydrogen evolution catalyst.

The invention relates to the technical field of lead-acid batteries and novel electrochemical energy storage materials, in particular to a graded porous carbon negative electrode material with nano-metal synergistic activity and application of the graded porous carbon negative electrode material in a long-life lead-carbon battery. The material takes hierarchical pore structure carbon as a matrix (which has micropores, mesopores and macropores at the same time, and the specific surface area reaches 1000m < 2 > / g), and is uniformly loaded with nano metal particles (such as Fe, Co, Sn and the like with the particle size of lt; and the content is 1%-10%). By optimizing the carbon pore structure and introducing the nano-metal, sulfation is remarkably inhibited, the capacitance effect is enhanced, and the hydrogen evolution reaction is reduced, so that the cycle life of the lead-acid battery is prolonged, and the charge-discharge performance of the lead-acid battery is improved. The preparation method is simple and controllable, is suitable for a lead-acid battery negative electrode additive, can be widely applied to the fields of start-stop batteries, energy storage systems and the like, and has important industrial application value.

The invention provides an alkaline electrolytic cell hydrogen evolution electrode and a preparation method thereof, and relates to the technical field of hydrogen evolution material preparation. A gradient electroplating method for a hydrogen evolution electrode of an alkaline electrolytic cell comprises the following steps that a two-electrode electroplating method is adopted, a nickel-based metal carrier serves as a cathode, the cathode is placed in electroplating liquid, and first electroplating is conducted at 3.0-4 V; carrying out second electroplating at 5.0-7.5 V and then carrying out third electroplating at 8.0-12V to obtain a hydrogen evolution electrode; the gradient evolution from a'nickel-rich binding layer 'to a'Ni-Fe-Mo transition layer' and then to a'molybdenum-rich catalytic layer 'from inside to outside is realized by applying progressive increase voltage in stages and inducing selective reduction of metal ions under different potential windows, the compatibility and interface bonding strength of a plating layer and a substrate are enhanced, meanwhile, a high-activity Mo component is enriched on the outer layer, and the plating layer is more stable in performance. The hydrogen evolution overpotential is remarkably reduced while the long-term stability is ensured, and a solution is provided for the alkaline electrolysis water hydrogen production electrode.

The invention provides a multi-metal / carbon coated iron-chromium flow battery electrode material and a preparation method thereof, and belongs to the technical field of iron-chromium flow battery energy storage. The preparation method comprises the following steps: carrying out pre-oxidation treatment, carbonization treatment and graphitization treatment on a precursor fiber felt to obtain a graphite felt; the preparation method comprises the following steps: dipping a graphite felt in a potassium hydroxide solution, then drying and carrying out primary calcination treatment, dipping an activated felt in a metal salt solution, then drying and carrying out secondary calcination treatment, dipping a multi-metal loaded activated felt in a dopamine solution containing a conductive agent, then adding a buffer solution until the pH value of the solution is 8-10 so as to enable dopamine to be self-polymerized, and then carrying out tertiary calcination treatment so as to obtain the multi-metal loaded activated felt. The multi-metal / carbon coated iron-chromium flow battery electrode material is obtained. The multi-metal / carbon coated iron-chromium flow battery electrode material disclosed by the invention has high hydrophilicity, high hydrogen evolution overpotential, high specific surface area, high energy efficiency and long cycle stability.

The invention relates to a RuSe2-MoSe2 / NF heterojunction bifunctional catalyst for fully hydrolyzed seawater as well as a preparation method and application of the RuSe2-MoSe2 / NF heterojunction bifunctional catalyst, and belongs to the technical field of seawater electrolysis electrocatalysis. The preparation method of the bifunctional catalyst comprises the following steps: (1) mixing deionized water and absolute ethyl alcohol, and magnetically stirring to obtain a mixed solvent; then adding sodium borohydride and selenium powder into the mixed solvent, and stirring until the mixture is completely dispersed to obtain a mixed solution; adding sodium molybdate dehydrate and ruthenium trichloride into the mixed solution, introducing high-purity nitrogen, replacing air, and continuing magnetic stirring to obtain a dark brown precursor mixed solution; and (2) completely immersing the pretreated nickel foam NF in the precursor mixed solution, carrying out hydrothermal reaction, cooling to room temperature after the reaction, taking out the nickel foam NF, washing with deionized water for 3-5 times, then washing with absolute ethyl alcohol for 3-5 times, and drying to obtain the nickel foam NF. The bifunctional catalyst provided by the invention can efficiently catalyze a hydrogen evolution reaction and an oxygen evolution reaction in seawater at the same time.

The invention discloses an aqueous zinc-vanadium battery electrolyte preparation method and a battery, and belongs to the technical field of aqueous zinc ion batteries. The preparation method comprises the following steps: preparing a polyquaternium aqueous solution; and adding soluble zinc salt into the polyquaternium aqueous solution, stirring and dissolving to obtain the composite electrolyte. According to the electrolyte, through the synergistic effect of the polyquaternary ammonium salt and the zinc salt, the acidity and water activity of a system are effectively reduced, dendritic crystal growth and hydrogen evolution reaction of a zinc negative electrode are inhibited, meanwhile, a nitrogen-containing protective layer is formed on the surface of a vanadium positive electrode, and vanadium dissolution is reduced. The battery containing the electrolyte shows excellent cycle stability in a wide temperature range of-20 to 80 DEG C, the cycle life of the zinc symmetric battery exceeds 3000 hours, the capacity retention rate of the whole battery after 4000 cycles reaches 87.6%, and the technical problems of aggravation of interface side reaction and fast degradation of battery performance under high-temperature and high-acidity conditions are solved.

The invention provides a preparation method of a cobalt-based intermetallic carbide material and application of the cobalt-based intermetallic carbide material in a preparation method of an electrocatalytic nitrate reduction electrolytic tank or a zinc-nitrate battery. The preparation method of the cobalt-based intermetallic carbide material comprises the following steps that cobalt chloride hexahydrate, indium chloride tetrahydrate, dicyandiamide and ketjen black are ground and mixed and then put into a tubular furnace for thermal annealing reduction, and the cobalt-based intermetallic carbide material is obtained. According to the method, cobalt-based intermetallic carbide material Co3InC0.75 powder is prepared into slurry, the slurry is dropped on carbon paper to be used for an electro-catalysis reaction, the material strengthens nitrate adsorption and water decomposition and inhibits a hydrogen evolution reaction, and therefore the performance of electro-catalysis of nitrate reduction to produce ammonia is improved.

The invention provides a self-supporting molybdenum oxycarbide catalyst as well as a preparation method and application thereof. The preparation method mainly comprises the following steps: 1) heating a stainless steel mesh; 2) performing quenching reaction on the stainless steel mesh in urea and a solution containing molybdenum salt to introduce a molybdenum source and a carbon source; 3) alternately heating the stainless steel mesh and quenching to obtain a carbon-containing molybdenum oxide nanosheet as a precursor; and 4) carrying out rapid instantaneous heating treatment on the carbon-containing molybdenum oxide nanosheet precursor through a flash evaporation Joule technology under the protection of an inert atmosphere to obtain the self-supporting molybdenum oxycarbide catalyst. The self-supporting molybdenum oxycarbide catalyst provided by the invention is of a two-dimensional ultrathin nanosheet structure, and the nanosheet is rich in oxygen defects and has super-hydrophilic capacity, so that the adsorption of water molecules can be effectively enhanced, and the energy potential barrier of conversion of a hydrogen evolution reaction intermediate can be reduced. The method is short in technological process, high in preparation efficiency and suitable for large-scale industrial production, and has huge development potential in the field of hydrogen production through water electrolysis.

The invention discloses a CO2 trapping system and method based on seawater grading pretreatment and electrochemical coupling. The system comprises a seawater grading pretreatment unit, an electrochemical coupling trapping unit and a CO2 separation and collection unit. The seawater grading pretreatment unit is used for removing suspended matters step by step and retaining carbonate through a triple filtering device, and preparing desalted seawater by utilizing a reverse osmosis device to meet electrolysis requirements; the electrochemical coupling trapping unit adopts a three-compartment structure including an anode chamber, a middle compartment and a cathode chamber, a cation exchange membrane and a proton exchange membrane are combined, protons generated by an anode are migrated to the middle compartment to react with seawater carbonate to generate CO2, and cathode hydrogen evolution and anode oxygen evolution are synchronously realized; and the CO2 separating and collecting unit is used for collecting high-purity CO2 through a membrane separation and vacuum negative pressure technology. According to the method, the problem of local consumption of deep and far sea wind power is solved, collaborative coupling of seawater purification, CO2 capture and green hydrogen preparation is realized, the green fuel synthesis cost is reduced, and the method has remarkable environmental and economic benefits.

This invention belongs to the field of electrocatalytic hydrogen evolution catalyst technology, and particularly relates to an ultrasmall intermetallic compound confined in mesoporous carbon interstices and its preparation method. Using mesoporous silica SBA-15 as a hard template, sulfur-containing amino acids are filled into the SBA-15 channels via capillary action as a carbon source. Simultaneously, potassium chloroplatinate and a transition metal source are also filled into the SBA-15 channels along with the sulfur-containing amino acids. The mass ratio of potassium chloroplatinate, SBA-15, and sulfur-containing amino acids is 1:5–10:20–30, and the metal mass is consistent with the atomic ratio in the formed Pt-based intermetallic compound. The reaction also includes a solvent and water. This invention uses electrocatalytic hydrogen evolution as a model reaction to investigate the catalytic activity and stability of this PtFe ultrasmall nanoparticle embedded in a mesoporous carbon support. Electrocatalytic results show that it exhibits excellent activity and stability, meeting the requirements of related applications and development.

The invention discloses a fullerene dumbbell photocatalyst for improving photocatalytic hydrogen production performance through electron delocalization. The fullerene dumbbell photocatalyst has an acceptor-donor-acceptor characteristic, is of a fullerene-thiophene fused ring dumbbell-shaped structure, comprises two symmetrically modified fullerene carbon cages, is bridged by a fused ring electron donor in the middle, and is similar to a dumbbell in shape. The fullerene dumbbell compound has the structural characteristic as shown in the formula I. The catalyst is simple in preparation process and high in design regularity. Importantly, the dumbbell molecular photocatalyst has a remarkable electron delocalization property, so that the photocatalytic hydrogen production performance is greatly improved. According to the invention, beneficial guidance is provided for design of an efficient photocatalyst and photocatalytic hydrogen production.

The application discloses a kind of uniform electroplating equipment of precision hardware's use method, comprising the following steps: S1, workpiece placement: hardware with inner angle is clamped between positioning rod and anode, while ensuring the inner angle side of hardware towards anode, drive component tends to anode center movement, cathode is pushed by cylinder and is attached to hardware, and the midline of arc inner angle of hardware coincides with the vertical edge of anode;S2, discharge plating layer: current density is 10-15mA / cm 2 It is applied to workpiece, and plating duration is kept for 2-10s;S3, periodic discharge: cylinder is retracted to adhere to device away from cathode while drive component moves along track away from anode center, cathode also moves away from workpiece at this time, rotate gear at the speed of 40-50 degrees / s, drive cathode to rotate 119-121 degrees around anode center, repeat step S1 and step S2, and gear rotation is 3 times as a cycle;S4: repeat step S1-S3, and plating is completed after two cycles;In the application, by setting periodic plating device, the problem of uneven coating on workpiece surface caused by hydrogen evolution reaction is reduced.

This invention relates to the field of water electrolysis and hydrogen energy utilization technology, and provides an in-situ electrodeposition method for improving NiMoP. x O y A method for studying the catalytic activity and stability of a self-supporting nickel-based hydrogen evolution electrode (NMOP). First, NiMoP... x O y The / NF self-supporting foam nickel-based electrode is prepared by immersing it in a nickel salt solution for a certain period of time, drying it, and then immersing it in a sodium sulfate solution for electrodeposition reduction reaction. This invention provides a simple and convenient method for adjusting the amount of metallic nickel deposited, ensuring its distribution among the active component particles of the electrode. This effectively improves the adhesion of the active component and prevents its detachment, significantly enhancing the hydrogen evolution activity and stability of the hydrogen evolution electrode. At an industrial current density of 100 mA / cm², the overpotential of the modified electrode prepared by this method is reduced by approximately 20% compared to the unmodified electrode, and the charge transfer resistance is reduced by approximately 41%. After 30,000 CV cycle accelerated durability tests, the increases in overpotential and charge transfer resistance are less than 7% and 26% of those of the unmodified electrode, respectively. Therefore, this invention has promising prospects for industrial application.