2115 results about "Hydrogen evolution" patented technology

The invention discloses a pipe network health real-time monitoring system and an evaluation method. According to the invention, through real-time health monitoring and dynamic deduction capability, the flexibility and safety of energy supply are significantly improved. The healthy twin module constructs a digital mirror image of the full life cycle of energy equipment, solar hydrogen production efficiency fluctuation, hydrogen storage tank pressure change and fuel cell attenuation trend can be accurately tracked, and risk points such as electrolytic cell abnormal hydrogen evolution and proton exchange membrane aging can be recognized in advance. The all-weather transparent monitoring enables the system to dynamically adjust the ratio of hydrogen production to power generation, the fuel cell is automatically switched to supply power in cloudy and rainy days, continuous energy supply is guaranteed, and the system can generate a coping plan in advance by simulating extreme scenes such as sudden drop of photovoltaic output and hydrogen leakage, so that the system is convenient to use. The energy interruption risk caused by sudden equipment failure is greatly reduced, meanwhile, the service life of key components is prolonged, the maintenance cost of a distributed energy network is reduced, and meanwhile the overall energy efficiency utilization rate is also improved.

The invention discloses a preparation process of a modified porous carbon material catalyst. The preparation process comprises the following steps: (1) mixing and calcining a biomass precursor and a template agent to prepare graded porous carbon; (2) low-frequency plasma pretreatment and high-frequency plasma fluorination modification are adopted; (3) introducing the pulse plasma into a nitrogen doping site; (4) spraying ionic liquid and activating H2 plasma to form a B / F co-doped layer; and (5) loading alloy nanoparticles such as PtRu through pulse electrodeposition. According to the obtained catalyst, biomass derived porous carbon serves as a carrier, a fluorine / nitrogen co-doped active layer is constructed on the surface of the carrier through multi-frequency plasma synergistic modification and ionic liquid auxiliary modification, superfine precious metal nanoparticles are loaded, the hydrogen evolution overpotential of the catalyst is smaller than or equal to 28 mV under the current density of 10 mA / cm < 2 >, the activity attenuation is smaller than 5% after 1000 times of circulation, and the catalyst has a good catalytic activity. The water electrolysis hydrogen production device is suitable for a large-scale water electrolysis hydrogen production device.

The present application relates to the technical field of catalysts and relates to a non-noble metal cathode hydrogen evolution catalyst for PEM water electrolysis and a use thereof. The present application provides a method for preparing a cathode hydrogen evolution catalyst. A nickel-molybdenum heteropoly acid having a specific structure is generated in situ on the surface of a porous carbon material carrier, and is used as a hydrogen evolution catalyst active component precursor, and an in-situ generated nickel-containing molybdenum sulfide active component is subjected to sulfidation treatment to prepare a non-noble-metal-supported cathode hydrogen evolution catalyst, wherein the in-situ generated nickel-containing molybdenum sulfide active component has a hydrogen adsorption free energy similar to that of Pt and catalytic hydrogen evolution activity, the dispersity is good, and the number of active sites is large, thereby reducing the costs of the catalyst; in addition, during the sulfidation treatment of the nickel-molybdenum heteropoly acid, nitrogen or phosphorus atoms in the carrier can be doped into the lattice of molybdenum disulfide, thereby reducing the hydrogen evolution Gibbs free energy of sulfur atoms on an MoS2 crystal basal surface, and more active sites are formed on a sulfur edge and a molybdenum edge, facilitating a hydrogen evolution reaction.

The invention relates to the technical field of electrochemical carbon dioxide reduction reaction catalysts, and discloses a preparation method and application of a mixed ionomer modified cuprous oxide catalyst, a hydrophobic ionomer and a proton exchange ionomer are used for performing surface modification on cuprous oxide powder, an effective hydrophobic structure is constructed on a Cu2O active site in a physical coating form, and the cuprous oxide modified cuprous oxide catalyst is prepared. A stable and controllable hydrophobic gas-liquid-solid three-phase reaction micro-interface is formed, so that the problems of low C-2 Faraday efficiency, poor selectivity, serious competitive hydrogen evolution reaction, carbonate deposition and the like in the existing process of preparing a C-2 product by electrocatalytic carbon dioxide reduction are solved, and the industrial current density (gt; and the method has the advantages of simple process flow, low price, high product selectivity and the like.

The invention provides a platinum-carbon catalyst taking hollow carbon nanospheres as a carrier and a preparation method of the platinum-carbon catalyst. The method comprises the following steps: adding a polymer monomer into a nano template dispersion liquid with a uniform size; then adding a proper amount of platinum salt into the solution to obtain a mixed solution, and stirring to react for 0.5-30 hours to obtain a reaction product; and annealing the reaction product, and then removing the nano template to obtain the platinum-carbon catalyst. The obtained platinum-carbon catalyst takes the hollow carbon nanospheres as a carrier and has a larger specific surface area, the platinum catalyst is loaded on the surfaces of the carbon nanospheres and can be in better contact with an electrolyte, and the obtained catalyst has good electrochemical activity and shows excellent electro-catalytic hydrogen evolution performance and oxygen reduction performance; and the related preparation method is simple and reliable, is suitable for preparation of an electrocatalytic hydrogen evolution electrode and an oxygen reduction electrode, and has a good application prospect in the fields of proton exchange membrane electrolytic cells, hydrogen fuel cells and the like.

The invention belongs to the technical field of zinc battery electrolyte, and discloses application of pyridine hydrochloride as an electrolyte additive in stabilizing a zinc negative electrode and realizing four-electron transfer of a zinc-iodine secondary battery. The hydrochloride containing the pyridine structure is used as an electrolyte additive, molecules of the pyridine structure are adsorbed on the surface of the zinc negative electrode to form a shielding layer, the deposition / stripping reversibility of the zinc negative electrode is improved, stabilization of the zinc negative electrode can be achieved, and the problems of zinc dendritic crystal, corrosion and hydrogen evolution are solved. Meanwhile, molecules with pyridine structures can activate and stabilize I- / I0 / I < + > four-electron redox reaction, inhibit I < + > hydrolysis side reaction and improve the energy density and cycling stability of the zinc-iodine battery. The problem of poor electrochemical deposition / stripping reversibility of a zinc negative electrode and the problem of poor stability of positive valence I < + > species of an iodine positive electrode of a four-electron transfer reaction are solved. The electrolyte containing the additive is low in cost, simple in method, easy to produce and high in practical value.

The invention relates to a NiCoW-CoP / Co3O4 (at) NF self-supporting heterostructure catalyst and a preparation method thereof. The preparation method comprises the following steps: preparing a CoP-coated NF precursor on foamed nickel through a constant potential electrodeposition method, then carrying out annealing treatment in a muffle furnace, and finally carrying out electrodeposition on NiCoW-LDH to obtain the NiCoW-CoP / Co3O4-coated NF material. According to the preparation method, the microsphere material with the surface covered with the dendritic dendrites is synthesized, and exposure of active sites is increased through the special surface structure of the microsphere material. The compounding of the trimetal hydroxide containing high-valence tungsten and the introduction of oxygen vacancies can effectively enhance the local electron density of oxygen atoms on the surface of the catalyst, thereby enhancing the catalytic performance and seawater corrosion resistance of the material. Compared with the prior art, the method disclosed by the invention is simple to operate and low in cost, and the prepared catalyst has high electrocatalytic activity, relatively low hydrogen evolution overpotential and oxygen evolution overpotential and long-time stability. And the method has important theoretical significance and potential application value for developing a bifunctional electrocatalyst suitable for electrolyzing seawater.

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.

Improved electrocatalysts for promoting a hydrogen evolution reaction (HER) or an oxygen evolution reaction (OER) from alkaline fresh water and seawater are disclosed. By incorporating metals, such as tungsten and rare earth elements, into the nickel molybdenum nitride framework, Ni1-xMoxN, the disclosed electrocatalysts demonstrate improved catalytic activity and stability compared to the original Ni&Ni0.2Mo0.8N catalysts, particularly under high-current alkaline conditions, in water electrolysis for hydrogen and oxygen production.

The invention belongs to the technical field of electrocatalytic materials, and relates to a two-phase bimetallic carbide heterostructure electrocatalyst and a preparation method and application thereof. The composition of the two-phase bimetallic carbide heterostructure electrocatalyst is WMoC2 / WVC2, and preferably, the mass percent of the WMoC2 is 40%-80%, and the mass percent of the WVC2 is 20%-60%. According to the invention, the bimetallic heterostructure WMoC2 / WVC2 electro-catalytic hydrogen evolution material is prepared through a step-by-step hydrothermal method and a solid-phase reaction method. The preparation method is green and pollution-free, the raw material cost is low, and the electrocatalytic activity in an alkaline environment is good.

The present invention discloses a Ni‑Se‑C hydrogen evolution electrode and a preparation method thereof, belonging to the technical field of electrocatalytic hydrogen evolution. The Ni‑Se‑C hydrogen evolution electrode is composed of a conductive substrate and a Ni‑Se‑C coating electroplated on the surface of the conductive substrate. First, the conductive substrate is pretreated in the present invention; then, Ni, Se, and C elements are deposited on the pretreated conductive substrate by electroplating to form a Ni‑Se‑C hydrogen evolution electrode with excellent hydrogen evolution performance. The synthesis method of the present invention is simple and the catalytic layer structure is stable. The synthesized Ni‑Se‑C hydrogen evolution electrode can be widely applied to the industrial production of hydrogen by electrolyzing water, and has significant practical value and economic value.

The present invention discloses an aqueous zinc-ion battery, comprising: a positive electrode sheet, a negative electrode sheet and an electrolyte. The positive electrode material of the positive electrode sheet is a layered vanadium-based positive electrode material. Since cations and water molecules are inserted into the layers of vanadium pentoxide, the interlayer spacing is increased and the structure of the host material is supported and stabilized. Therefore, the fast and reversible insertion and extraction performance of charge and discharge ions can be improved, and the high rate and long cycle life of the layered vanadium-based positive electrode material can be achieved. The negative electrode sheet is a zinc foil with a surface coating. By defining the thickness of the surface coating to be 100 nm to 20 μm, the surface coating can prevent the zinc foil from directly contacting the electrolyte, and zinc will be deposited between the coating and the zinc foil during the charge and discharge process. In this way, the direct contact between zinc and the electrolyte is avoided, which helps to solve problems such as dendrites, corrosion and hydrogen evolution of the zinc negative electrode. Compared with the traditional aqueous zinc-ion battery, the electrochemical performance of this aqueous zinc-ion battery is enhanced.

The invention discloses a synthesis method of an in-situ carbon-loaded osmium-platinum single-phase solid solution nano-alloy catalyst and application of the nano-alloy catalyst in a hydrogen evolution reaction, and solves the technical problems that when an existing osmium-platinum alloy catalyst is used, the loading process is tedious and time-consuming, and the catalytic performance becomes poor due to non-uniform loading. The method comprises the following steps: respectively weighing an osmium compound and a platinum compound, mixing the osmium compound and the platinum compound, and adding the mixture into a polyol solvent until the mixture is completely dissolved to obtain a precursor solution; the preparation method comprises the following steps: preparing a carbon carrier, adding the carbon carrier into a polyol solvent until the carbon carrier is completely dissolved to obtain a carrier solution, and heating the carrier solution to 150-300 DEG C; in an inert atmosphere, adding the precursor solution into the heated carrier solution within two minutes, uniformly stirring, and preserving heat to obtain a mixed solution; and sequentially washing, centrifuging and drying to obtain the in-situ carbon loaded osmium-platinum solid solution nano-alloy catalyst. The method is simple in synthesis and high in synthesis efficiency, and the catalyst which is uniformly dispersed in a loaded state can be obtained.

The invention discloses a method for constructing a foamed nickel hydrogen evolution electrode with a multi-layer gradient structure based on two-step electrodeposition. According to the method, the in-situ growth of a multilayer gradient structure catalyst layer is realized by regulating and controlling the current density, and the core process comprises the following steps: 1, pretreatment of an electrode substrate: carrying out ultrasonic cleaning on foamed nickel through hydrochloric acid, absolute ethyl alcohol and deionized water in sequence, and removing surface impurities; 2, step-by-step electro-deposition of the gradient catalyst layer: firstly, electro-deposition is carried out under low current density to form a uniform and compact transition catalyst layer, the contact area between the catalyst layer and the base material is increased, and the durability and stability of the catalyst layer are improved; and then switching to high current density for bubble template method electrodeposition, spontaneously forming a catalyst layer with an inverted cone-shaped hole array structure by utilizing the dynamic template effect of violent hydrogen evolution bubbles, and promoting rapid removal of the bubbles by utilizing the hole array. The electrode prepared by the method has excellent stability, bubble removal capability and catalytic activity in hydrogen evolution reaction.

The present invention relates to the field of water electrolysis and hydrogen production. Disclosed is a carbon nanotube-supported nitrogen-doped catalyst. The catalyst has a carbon nanotube structure as a support, and cobalt and ruthenium as active components, wherein the content of the cobalt element is 30-45w%, the content of the ruthenium element is 1-7wt%, and the proportion of the ruthenium element present in the form of RuN is 60-90wt% relative to the total ruthenium element. A graphitized structure of the catalyst is conducive to charge conduction, Ru is uniformly loaded on the surface of the support by means of a low-temperature reduction process and interaction with defect sites on the surface of the support, and then after high-temperature roasting, Ru interacts with the N element and the metal Co, thereby improving the hydrogen evolution catalytic activity of the catalyst.

The invention relates to a MnWO4 / ZnIn2S4 heterojunction photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalytic materials. In the experiment process, MnWO4 is dissolved in a precursor solution of ZnIn2S4, the MnWO4 / ZnIn2S4 heterojunction composite materials with different molar ratios are obtained by changing the molar ratio of an Mn source, and the MnWO4 / ZnIn2S4 heterojunction composite materials can be applied to the field of hydrogen evolution through photocatalytic water decomposition. Compared with an existing photocatalyst, the MnWO4 / ZnIn2S4 heterojunction has the advantages that the controllability is good when the MnWO4 / ZnIn2S4 heterojunction serves as a catalyst, the separation efficiency of current carriers can be further improved, and it is obtained through experiments that the composite material has high hydrogen yield and good stability when being used for photocatalytic water splitting. The method is green and environment-friendly, simple, convenient to operate and low in material preparation cost, conforms to the green and environment-friendly concept advocated at present, and has a wide application market prospect.

The invention discloses a preparation method of a rare earth element doped nickel-based selenide nano-material and application of the rare earth element doped nickel-based selenide nano-material in electro-catalysis water full-hydrolysis reaction. According to the method, nickel salt, cerium salt, selenium dioxide and potassium chloride are prepared into electrolyte, and the electrolyte is subjected to electro-deposition on a foamed nickel substrate to obtain Ce-doped Ni0.85Se nanoparticles growing on foamed nickel. The crystal structure and electron distribution of Ni0.85Se are optimized by doping trace rare earth element cerium, so that the HER and OER performances of the Ni0.85Se are greatly improved. The prepared catalyst is self-supporting closely-packed nanoparticles, the formed amorphous structure is easy to expose more active sites, the catalyst has good electrocatalytic hydrogen evolution and oxygen evolution performance under alkaline conditions, the overpotential in electrocatalysis of nickel-based selenide is greatly reduced, and the electrocatalytic performance of nickel-based selenide is improved. And excellent electro-catalytic activity is shown in electro-catalytic water full hydrolysis. And the self-supporting electrode is not easy to fall off due to generation of bubbles in the reaction process, so that the working stability of the catalyst is improved.

The invention discloses a metal film electro-catalysis chlorine evolution electrode with Ir monatomic inlaid in Pt crystal lattices and a synthesis method and application thereof. Through embedding of Ir single atoms, ortho-position Pt atoms approach Ir atoms, lattice shrinkage is caused, finally, Pt atom array sorting is disordered, more Pt atoms are exposed on the edge through embedding of the Ir single atoms, magnetism is obviously improved, and therefore the obtained metal thin film with the Ir single atoms embedded in the Pt lattice has high CER selection driving performance, and the metal thin film with the Ir single atoms embedded in the Pt lattice can be applied to the field of solar cell devices. And the catalyst has excellent electro-catalytic chlorine evolution activity and electro-catalytic hydrogen evolution activity. When applied to the field of electro-catalysis, especially as an electro-catalysis chlorine evolution electrode, the electrode can significantly improve the chlorine evolution efficiency of an anode electrode, reduce oxygen evolution reaction and prolong the service life of the electrode.

The invention provides a copper-nickel alloy foil and a preparation method and application thereof, and belongs to the technical field of lithium ion battery negative electrode current collectors, and the preparation method comprises the following steps: preparing a copper-nickel composite electrolyte, and adding a coordination agent, a pH buffer agent and an additive into the copper-nickel composite electrolyte to obtain a mixed electrolyte; the coordination agent comprises a main coordination agent and an auxiliary coordination agent, and the main coordination agent comprises at least one of trisodium citrate, potassium sodium tartrate and sodium pyrophosphate; the auxiliary coordination agent comprises at least one of ammonia water, glycine and triethanolamine; and a cathode and an anode are placed in the mixed electrolyte, the pH of the mixed electrolyte is controlled to be 6-10, direct current is applied for electrochemical deposition, and the copper-nickel alloy foil is obtained. According to the method, the alkalescence system is adopted, the main coordination agent and the auxiliary coordination agent are used, full coordination of free Cu < 2 + > and Ni < 2 + > is achieved, precipitation is avoided, the hydrogen evolution phenomenon is greatly reduced, and the alloy foil quality 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 charge-discharge energy-saving electro-catalysis sewage treatment method which comprises the following steps: step 1, cleaning a carbon electrode, inserting the carbon electrode into sewage as a cathode and an anode at the same time, and arranging a magnetic stirrer at the bottom of an electrochemical reaction tank; step 2, applying constant voltage or constant current to the working electrode to ensure that the voltage can degrade pollutants, the anode does not generate oxygen evolution reaction, and the cathode does not generate hydrogen evolution reaction; step 3, stopping applying voltage or current to the working electrode, monitoring open-circuit voltage, gradually reducing the open-circuit voltage, and continuously degrading pollutants by utilizing the electric energy stored by the electrode; and step 4, repeating the step 2 and the step 3 until the electrocatalytic degradation is completed. Under the condition that the removal effect is guaranteed, electric energy is saved, and about 30-90% of energy consumption is reduced; the constant-current charging catalysis step ensures that the current density is controllable, and safe production is ensured; the process is simple, does not need special equipment and materials, and is suitable for upgrading and reconstruction of existing sewage treatment systems.

The invention discloses an aqueous all-iron flow battery negative electrode electrolyte and an aqueous all-iron flow battery, and belongs to the fields of an electrochemical energy storage technology and a flow battery. The aqueous total iron flow battery negative electrode electrolyte comprises an iron ion-containing active substance, a first complexing agent, a second complexing agent and hydrogen evolution inhibitor, a supporting electrolyte and water, and the first complexing agent and the second complexing agent and hydrogen evolution inhibitor are simultaneously combined to iron ions to form a stable chelate with a saturated six-coordinate structure. The first complexing agent is selected from triethanolamine or analogues thereof, and the second complexing agent and hydrogen evolution inhibitor is selected from organic acids having a chelation effect and salts thereof. According to the invention, two complexing agents are combined with the same iron ion at the same time to form a stable six-coordinate structure, so that the problems of capacity fading, low energy efficiency and poor cycling stability caused by iron separation and hydrogen separation due to dissociation of organic matters and ferrous ions in the operation process of the battery are effectively relieved.

The invention discloses a zinc-bromine flow battery electrolyte, a negative electrode cosolvent and a preparation method thereof, and belongs to the technical field of electrochemical energy storage, the negative electrode cosolvent of the zinc-bromine flow battery electrolyte is a carboxyl-containing butenoic acid substance, the butenoic acid substance is used as the cosolvent, and zinc is induced to preferentially deposit on a (002) plane by modifying a solid-liquid interface, so that the zinc-bromine flow battery electrolyte is obtained. And the deposition process of zinc is converted from an irregular form which tends to form a dendritic crystal shape and a moss shape into a deposition layer which tends to form a flat and compact deposition layer which is parallel to the substrate. The highly uniform zinc deposition fundamentally and effectively inhibits the formation and growth of zinc dendrites, and greatly improves the stability of the negative electrode and the cycle life of the battery. Chlorides improve ionic conductivity to reduce internal resistance, and sodium acetate buffer inhibits hydrogen evolution on stable pH; and synergistic optimization of positive and negative components ensures efficient reaction. And moreover, the raw materials are easy to obtain, the preparation is simple and convenient, the industrialization threshold is reduced, and the large-scale energy storage requirement is met.

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 the technical field of catalysts, in particular to an alkaline electrolytic water hydrogen evolution catalyst of a Pt-Co core-shell nanocluster loaded VN / CNT composite carrier, which comprises a composite carrier and a core-shell nanocluster loaded on the composite carrier, the composite carrier is a VN / CNT composite carrier, and the core-shell nano-cluster is a Pt-Co core-shell nano-cluster; the Pt-Co core-shell nano-cluster takes Pt as a core and Co as a shell, and the particle size of the core-shell is 1-15 nm; the VN / CNT composite carrier comprises CNT and VN nanoparticles loaded on the CNT, and the mass fraction of VN is 5%-40%. In the Pt-Co core-shell structure, the Co shell layer optimizes the d band center of Pt through an electronic effect, and reduces the adsorption energy barrier of H *; meanwhile, the Co shell serves as a co-catalyst, dissociation of H2O under the alkaline condition is remarkably promoted, and compared with a single Pt catalyst, the activity is improved by 30% or above under the same Pt dosage.

The invention relates to the technical field of chemical catalysis, and particularly discloses a covalent organic framework material loaded bimetallic monatomic electrocatalyst and a preparation method and application thereof, the catalyst comprises a carrier and atomic-scale dispersed metal diatomic active sites; the atomic-scale dispersed metal diatomic active sites are anchored in the carrier through a simple post-impregnation method; the carrier is a triazinyl covalent organic framework; a coordination structure is formed between the atomic-scale dispersed metal diatomic active sites and the carrier through a nitrogen-metal-chlorine bridging structure; the diatom-dispersed difunctional electrocatalyst has good overall water decomposition performance, under the condition of 1M KOH, the overpotential of hydrogen evolution reaction is 39.3 mV at 10 mA cm <-2 >, the overpotential of oxygen evolution reaction is 251.2 mV at 10 mA cm <-2 >, the synthesis process is simple and easy to implement, the preparation cost is low, and the diatom-dispersed difunctional electrocatalyst has industrial production and application prospects.

The invention discloses a lead-free phosphorus chemical nickel plating solution, and relates to the field of chemical nickel plating, and the lead-free phosphorus chemical nickel plating solution comprises the following components: 6-10 g / L of nickel salt, 5-10 g / L of a complexing agent, 1-5 g / L of a brightener, 5-12 g / L of a reducing agent, 0.6-0.9 g / L of a composite stabilizer, 2-10 g / L of a plating starting agent, 0.1-0.6 g / L of a hydrogen evolution preventing agent and 30-60 mg / L of a surfactant. The adopted plating starting agent is high in decomposition capacity, after the service cycle is increased to 4 MTO, the problem that decomposition products are accumulatively increased to a certain degree to cause blackening of a plating layer can be relieved, 5-6 MTO can be achieved, meanwhile, the adopted composite stabilizer is a composition composed of an aminopyrrole carboxylic ester compound and an aminothiazole carboxylic ester compound, and the composite stabilizer has the beneficial effects of being environmentally friendly and free of pollution. The stability of traditional elements such as lead and cadmium can be improved, and the problem that the service cycle of stabilizers such as benzotriazole or sodium thiosulfate is short can be solved.

This invention relates to the field of alkaline water electrolysis for hydrogen production, and discloses a water electrolysis hydrogen evolution catalyst, its preparation method, and a method for water electrolysis to produce hydrogen. The catalyst contains Ru, Co, Ni, C, and N; wherein C exists in the catalyst in the form of carbon nanotubes; the Ru content in the catalyst is 0.1-5 wt%, and the average particle size of Ru is 2-5 nm. This invention uses a carbon nanotube composite structure generated by ZIF pyrolysis as a support, which improves the charge transfer capacity by increasing the Ru loading and dispersion. Furthermore, the synergistic effect of Ru with Co and Ni effectively enhances the catalytic hydrogen evolution activity of the Ru-Co-Ni water electrolysis hydrogen evolution catalyst.

The invention provides a preparation method of a Ru-based alloyed heterojunction water electrolysis hydrogen production catalyst, and belongs to the technical field of nano materials and electrochemistry. The two-dimensional porous Ru-based alloyed heterojunction electrolytic water hydrogen production catalyst can be prepared at low cost and high efficiency in an air atmosphere by using a ternary molten salt assisted Joule heat rapid calcination process. The water electrolysis hydrogen production catalyst has excellent structure and component advantages, and the two-dimensional porous structure has the advantages that the number of active sites of the catalyst can be increased, and hydrogen can be easily removed in the reaction process. The alloying heterojunction component has the advantages that the variety of Ru active sites can be increased and the synergistic effect of different components can be stimulated by alloying and abundant heterogeneous interfaces. Furthermore, the hydrogen evolution reaction kinetics of the adsorption energy of Ru to an intermediate product is optimized, and excellent alkaline electrolytic water hydrogen evolution performance is shown.

The invention belongs to the technical field of water electrolysis hydrogen production, and particularly relates to a NiRuM / C catalyst for anion exchange membrane water electrolysis as well as a preparation method and application of the NiRuM / C catalyst. The NiRuM / C hydrogen evolution catalyst is prepared by adopting two ways: one way is a coprecipitation method: firstly coating a carbon carrier with amorphous nickel salt by utilizing coprecipitation, and then preparing the NiRuM / C catalyst by utilizing precipitation dissolution equilibrium movement; and 2, a group anchoring method: dispersing metal salts such as nickel, ruthenium and the like and the dopamine hydrochloride surface functionalized carbon material in a polar solvent, and preparing the NiRuM / C catalyst through coordination interaction and self-polymerization reaction of dopamine molecules. The invention provides two preparation ways of the NiRuM / C material with alkaline hydrogen evolution performance better than that of a platinum-based material, and the NiRuM / C material is applied to anion exchange membrane water electrolysis hydrogen production, so that the problems of complex process, high price, low hydrogen production efficiency, poor durability and the like of the existing preparation technology are solved.