111results about How to "Reduce overpotential" patented technology

The invention discloses a rechargeable magnesium battery composite electrolyte and a preparation method and application thereof, the electrolyte comprises an organic ether solvent, an electrolyte magnesium salt and an additive, and the additive is one or two of a sulfimide additive or a phosphate additive. By introducing the sulfimide additive into the organic ether solvent electrolyte containing the electrolyte magnesium salt, the kinetic performance of the electrolyte is remarkably improved under the mutual synergistic effect of all the components, the solvation structure of electrolyte magnesium ions is effectively regulated and controlled, the dissolution of the electrolyte magnesium salt is accelerated, the conductivity of the magnesium ions is improved, and the service life of the electrolyte is prolonged. Reversible electrochemical circulation of the magnesium symmetric battery under high current density is realized, the cycle life of the battery is prolonged, a phosphate ester additive is continuously introduced, a phosphorus-rich magnesium ion conductive interface film is formed on the surface of magnesium metal, the transmission capacity of Mg < 2 + > is enhanced, the overpotential and potential barrier of magnesium negative electrode dissolution / deposition are reduced, and the performance of the battery is improved. Therefore, the electrochemical reversibility and coulombic efficiency of the asymmetric battery are improved.

The invention discloses an alkaline electrolytic cell pole frame polar plate with a turbulent flow structure and a manufacturing method. The alkaline electrolytic cell pole frame polar plate comprises a pole frame, an alkaline liquid inlet is formed in the bottom of the pole frame, and a hydrogen gas-liquid outlet and an oxygen gas-liquid outlet are formed in the top of the pole frame; the outer edge of a main pole plate body is fixedly connected to the inner ring of the pole frame, the upper surface of the main pole plate is lower than the upper surface of the pole frame so as to form a small electrolysis chamber, and the upper surface of the main pole plate body is sequentially provided with a first area, a second area and a third area from an alkali liquor inlet to a hydrogen gas-liquid outlet side; a plurality of rows of crescent-shaped protruding units A are arranged in the first area and the third area, and a row of semispherical protruding units B are arranged in the second area. According to the alkaline electrolytic cell pole frame pole plate with the turbulent flow effect and the effect of enabling the flow velocity distribution of liquid in the small electrolysis chamber to be uniform, the problems existing in the prior art are solved, the transverse flowing capacity of alkaline liquid in the small electrolysis chamber is enhanced, a liquid retention area is reduced, and meanwhile the bubble escaping capacity is enhanced.

The invention discloses a method for preparing a graded porous nickel electrode by step-by-step dealloying and application thereof, and the method comprises the following steps: spraying a nickel-aluminum material on a nickel-based substrate to obtain a first intermediate product; performing heat treatment on the first intermediate product to obtain a second intermediate product; the second intermediate product is sequentially placed in alkali liquor with different concentrations for step-by-step activation, and the graded porous nickel electrode is obtained; in the step of step-by-step activation, the concentration of the alkali liquor is gradually reduced, and the activation temperature is gradually reduced. According to the graded porous nickel electrode, the efficient mass transfer rate and catalytic efficiency are guaranteed; the bonding strength between the coating and the substrate is high, the interlayer structure is stable, the mechanical property and stability are good, and the service life is long; and the hierarchical porous structure can be constructed only through step-by-step activation, so that the preparation process is remarkably simplified.

The invention relates to the field of battery materials, in particular to a halogen-free electrolyte for a magnesium metal battery and a preparation method of the halogen-free electrolyte. The magnesium salt comprises at least one of bis (trifluoromethanesulfonyl) imide magnesium and magnesium trifluoromethanesulfonate; the additive is prepared from at least one of indole, 3-azaindole, 4-azaindole, 5-azaindole, 6-azaindole, 4-amino indole, 5-amino indole, 6-amino indole and 7-amino indole; the organic solvent comprises ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1, 3-dioxolame or 1, 3-dioxane. The preparation method comprises the following steps: sequentially adding the magnesium salt and the additive into the organic solvent, and stirring and reacting at room temperature for 1 min to 24 h to obtain the halogen-free electrolyte for the magnesium metal battery. And the prepared electrolyte has excellent performances of small overpotential, long service life and wide electrochemical window, and has a good commercial application prospect.

The invention relates to a preparation method and application of a hollow nanorod array oxygen evolution electrode, and belongs to the field of hydrogen production by alkaline electrolysis of water. The self-supporting nickel-iron double-metal hydroxide nanosheet coated cobalt hydroxide hollow nanorod array oxygen evolution electrode is obtained through a continuous electro-deposition method; foamed nickel is used as a substrate, and catalytic active components loaded on the substrate are cobalt hydroxide and ferro-nickel double-metal hydroxide; a hollow nanorod structure vertically grows on the surface of the foamed nickel substrate, and the hollow nanorod structure comprises a hollow nanorod-shaped cobalt hydroxide layer located in the hollow nanorod structure and a plurality of layers of nickel-iron double-metal hydroxide nanosheets wrapping the surface of the hollow nanorod-shaped cobalt hydroxide layer; the diameter of the hollow nanorod is 0.2-1 micron, and the length of the hollow nanorod is 2-3 The electrode provided by the invention has unique morphology and good oxygen evolution catalytic activity.

The invention relates to the technical field of electrochemical catalysis, in particular to a superfine nickel-doped ruthenium oxide water electrolysis hydrogen production catalyst prepared through a template method and application of the catalyst, the catalyst comprises a RuO2 matrix and a nickel element evenly doped in the matrix, and the mass of the nickel element accounts for 5%-20% of the total mass of the catalyst. According to the invention, the nickel element is doped into a RuO2 lattice, so that the charge distribution of RuO2 is optimized, the intrinsic activity of a catalytic active site is improved, and the catalytic performance of the oxygen evolution electrocatalyst of the material is improved; and meanwhile, ZIF8 is used as a template sacrificial agent, so that agglomeration among the nano-particles is reduced, and the uniformly dispersed metal nano-particles can be prepared.

The invention discloses iridium-cobalt oxide nanoparticles as well as a preparation method and application thereof. The iridium-cobalt oxide nanoparticles comprise a cobaltosic oxide carrier and supported iridium oxide. The preparation method comprises the following steps: 1) preparing an iridium salt-cobalt salt aqueous solution; 2) preparing a reaction solution of a complex containing iridium ammonium salt and cobalt; (3) preparing an iridium hydroxide-cobalt complex compound; and 4) grinding the iridium hydroxide-cobalt complex compound, placing the ground complex compound in an oxygen-containing atmosphere for heat treatment, and then carrying out water washing and drying. The iridium-cobalt oxide nano-particles are low in iridium content, small and uniform in particle size and simple in preparation method, have the advantages of being high in electrochemical activity, good in electrochemical stability and the like when being used as an OER reaction catalyst, and are suitable for large-scale industrial application in the field of hydrogen production through water electrolysis.

The invention discloses a magnesium-lithium composite electrolyte for a rechargeable magnesium battery and a preparation method and application thereof, the electrolyte comprises an organic ether solvent, an electrolyte magnesium salt and a lithium salt additive, the concentration of the electrolyte magnesium salt in the electrolyte is 0.01-1.0 M, the concentration of the lithium salt additive in the electrolyte is 0.01-1.0 M, the concentration of the organic ether solvent in the electrolyte is 0.01-1.0 M, and the concentration of the organic ether solvent in the electrolyte is 0.01-1.0 M. And the molar ratio of the electrolyte magnesium salt to the lithium salt additive is (0.5-3): 1. The lithium salt additive is introduced into the organic ether solvent electrolyte containing the electrolyte magnesium salt, the kinetic performance of the electrolyte can be remarkably improved due to the high diffusion and migration rate of Li < + >, the solvation structure of Mg < 2 + > on a negative electrode interface can be regulated and controlled through Cl <->, the overpotential of magnesium negative electrode dissolution / deposition is reduced, the electrochemical reversibility is improved, and the performance of the electrolyte is improved. Therefore, the coulombic efficiency of the battery is improved, the cycle life of the battery is prolonged, and an electrochemical window is widened to stable 4.0 V; and the preparation method is simple in process, does not need complex pre-treatment, post-treatment and other procedures, greatly reduces the process cost, and improves the reversibility and charge-discharge stable cycle performance of the rechargeable magnesium battery.

The invention relates to the technical field of off-grid renewable energy hydrogen production, and discloses an off-grid alkaline hydrogen production system and a power adaptive distribution and safety control method thereof, the off-grid alkaline hydrogen production system comprises a renewable energy power supply unit, a parallel electrolytic cell module, a gas-liquid treatment system and a main controller; in the Faraday hydrogen production mode, the bubble volume is compressed by adjusting the operation pressure so as to modulate the impedance characteristic of the electrolytic cell, and the energy efficiency is improved in cooperation with current control; and in the non-Faraday polarization hot standby mode, the voltage of the rectifier cabinet is controlled to be clamped to a non-gassing polarization interval, and liquid level plugging is constructed in the U-shaped communicating pipeline according to the fluid statics principle. The system is further provided with a transient buffering strategy based on the pneumatic capacity, and pressure attenuation is delayed through the gas dead zone volume when power is suddenly reduced. The problems of hydrogen production efficiency optimization, low-power safe hot standby and mechanical protection under wide power fluctuation are effectively solved.

The invention belongs to the technical field of solid solution nanometer material preparation, and particularly relates to a ruthenium-cobalt solid solution oxide nanofiber material and a preparation method and application thereof. The ruthenium-cobalt solid solution oxide nano-fiber material is prepared by adopting an electrostatic spinning technology in combination with air atmosphere calcination, and the ruthenium-cobalt solid solution oxide nano-fiber material is integrally in a fiber form with a rough and uniform surface, and has more exposed active sites and excellent electron transmission performance. The preparation method provided by the invention is simple and easy to implement, relatively low in cost and short in preparation period, and industrial large-scale production can be realized. The ruthenium-cobalt solid solution oxide nanofiber material prepared by the preparation method disclosed by the invention is used as an electrocatalytic water decomposition bifunctional electrocatalyst, shows excellent hydrogen evolution and oxygen evolution catalytic activity and stability under industrial-grade current density, and realizes efficient, stable, clean and green hydrogen energy production; the defects of low activity, poor stability, high price and the like of an industrial electrocatalyst are overcome, and the method has very high practical application and economic values.

The invention relates to the technical field of electro-catalysis hydrogen evolution, and discloses a preparation method and application of a double-gradient self-supporting hydrogen evolution electrode. The preparation method comprises the following steps: forming an oxygen-containing hydrophilic group on the surface of conductive carbon cloth to obtain pretreated carbon cloth; a metal organic framework composed of Co and dimethylimidazole grows on the surface of the pretreated carbon cloth in an in-situ self-growth mode, the metal organic framework forms triangular protrusions on the surface of the pretreated carbon cloth, roasting is conducted, and a geometric gradient electrode is obtained; and covering the surface of the geometric gradient electrode with a mask distributed with a plurality of through holes, applying a hydrophobic and aerophilic coating on the surface of the geometric gradient electrode through the through holes, and forming a plurality of hydrophobic and aerophilic areas on the surface of the geometric gradient electrode. By adopting the preparation method disclosed by the invention, the overpotential and the overpotential growth rate of the electrode under high current density can be effectively reduced.

The invention discloses a method for improving alkaline water electrolysis hydrogen production efficiency by using electrolyte concentration difference, and belongs to the technical field of water electrolysis hydrogen production. The method comprises the following steps: adding KOH electrolyte with the concentration of 30wt% into the cathode region on one side of the diaphragm, and adding KOH electrolyte with the concentration of 35wt% into the anode region on the other side of the diaphragm; and electrifying the electrolytic bath, controlling the temperature to be 80-90 DEG C, and carrying out electrolytic reaction on the water under the action of the electric field. The hydrogen production efficiency of alkaline electrolyzed water is improved by utilizing the electrolyte concentration difference, the hydrogen production efficiency and the hydrogen purity can be improved, the energy consumption and the equipment cost can be reduced, the reliability and the durability of the system are improved, meanwhile, the environmental influence is reduced, and a positive role is played in promoting the production and the application of green hydrogen.

The invention discloses a D-NiFe / DMBD-Fc catalyst based on a double-defect engineering strategy as well as a preparation method and application of the D-NiFe / DMBD-Fc catalyst. The preparation method comprises the following steps: dissolving a nickel source and an iron source in water, and uniformly stirring and mixing to obtain a mixed solution 1; dissolving an organic ligand 2, 5-dimercaptoterephthalic acid and ferrocenecarboxylic acid in N, N-dimethylacetamide, and carrying out ultrasonic treatment until the organic ligand is dissolved to obtain a mixed solution 2; dropwise adding the obtained mixed solution 1 into the mixed solution 2, and ultrasonically mixing uniformly to obtain a mixed solution 3; placing foamed nickel in the obtained mixed solution 3, and carrying out hydrothermal reaction to obtain foamed nickel loaded with a precursor product; and putting the obtained foamed nickel loaded with the precursor product into an ethanol solution of alkali, and carrying out etching reaction to obtain the D-NiFe / DMBD-Fc catalyst based on the double-defect engineering strategy. The prepared catalyst is used for electro-catalysis oxygen evolution reaction and has efficient electro-catalysis activity and good stability.

The invention belongs to the technical field of electrochemistry, and particularly relates to an artificial solid electrolyte interface film based on MXene quantum dots and a preparation method and application thereof.The preparation method includes the steps that an MAX phase is etched with concentrated hydrochloric acid to obtain MXene nanosheets, then the MXene quantum dots are obtained through freeze drying assisted by a hydrothermal method or an ultrasonic treatment method, and after the MXene quantum dots are mixed with a binder and a solvent, the MXene quantum dots are prepared into the artificial solid electrolyte interface film based on the MXene quantum dots. And coating and evaporating the solvent to obtain the artificial solid electrolyte interfacial film based on the MXene quantum dots. The reason that the MXene quantum dots are adopted as the artificial solid electrolyte interfacial film is that the surfaces of the MXene quantum dots contain a large number of lithium-loving groups, and the MXene quantum dots can be used as seed sites to induce a uniform lithium deposition process, so that the growth of lithium dendrites is effectively inhibited, and the coulombic efficiency of the lithium metal battery is improved.

The invention relates to the field of electrochemistry, and discloses a preparation method of a low-overpotential anode and application of the low-overpotential anode in electrocatalytic water splitting oxygen desorption. The preparation method comprises the following steps: 1) loading molybdenum metal on foamed nickel subjected to pickling pretreatment; 2) soaking the foamed nickel molybdenum in a soaking solution containing uranium and / or thorium metal salt and iron salt for replacement reaction, taking out and drying; and 3) carrying out aerobic calcination on the product obtained in the step 2) at 100-200 DEG C for 0.5-1.5 h to obtain the low overpotential anode. According to the prepared anode, foamed nickel serves as a carrier, after molybdenum metal is loaded on the carrier, uranium and / or thorium and iron elements are replaced and deposited on the carrier through a replacement reaction among the elements, finally, interaction between the deposited elements and the carrier is enhanced through calcination, and metal elements in the deposited elements form corresponding oxides. And when being used as an anode for electrocatalytic cracking of alkaline water or alkaline seawater for oxygen evolution, the composite material has reduced overpotential and higher stability.

The invention discloses a titanium dioxide loaded metal composite material and a preparation method and application thereof, the titanium dioxide loaded metal composite material comprises a titanium substrate and a titanium dioxide nano array, and the titanium dioxide nano array grows on the surface of the titanium substrate; the titanium dioxide nano array is composed of titanium dioxide nano rods; metal rhodium nanoparticles are loaded on the surface of the titanium dioxide nanorod. The rhodium nanoparticles can be fully exposed on the outer surface by utilizing the structure of the titanium dioxide three-dimensional nano array, so that the active surface area of the rhodium nanoparticles is greatly increased, and the activity of the titanium dioxide loaded metal composite material as a hydrogen evolution reaction catalyst is improved. According to the preparation method of the composite material, ethylene glycol is adopted as a reaction solvent, the prepared titanium dioxide nano array has three-dimensional anisotropy and high stability, and a large surface area and a complex electron transmission path are provided; and then the rhodium nanoparticles are loaded by a wet chemical method, so that the catalytic activity of the rhodium nanoparticles is improved.

The invention belongs to the technical field of amorphous / crystalline heterojunction catalysts, and discloses an amorphous / crystalline heterojunction catalyst for hydrogen evolution reaction and a preparation method thereof, the preparation method comprises the following steps: S1, selecting foamed nickel as a substrate, and performing pretreatment; s2, preparing a high-purity Ni target and a high-purity Zr target as magnetron sputtering target materials for later use; s3, the foamed nickel substrate pretreated in the step S1 is installed on a substrate table of magnetron sputtering equipment, then the Ni target and the Zr target in the step S2 are installed in a target seat of a magnetron sputtering coating machine, a cavity is vacuumized, and argon is introduced to enable the pressure in the magnetron sputtering coating machine to be stabilized at the working pressure; s4, sputtering a Ni target and a Zr target by using direct current to obtain an amorphous / crystalline heterojunction NiZr oxide catalyst; the amorphous / crystalline heterojunction catalyst is prepared by using a magnetron sputtering method, so that the activity of the HER catalyst is improved, and the preparation method is simple and convenient to operate.

The invention belongs to the technical field of preparation of green hydrogen by electrolyzing water, and discloses a molybdenum disulfide loaded platinum nanoparticle composite electrocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving ammonium molybdate, thiourea and polyvinylpyrrolidone in deionized water, and carrying out heat treatment to obtain MoS2; and adding a Na2 [PtCl6]. 6H2O aqueous solution into the dispersion liquid of MoS2, and carrying out annealing treatment to obtain the molybdenum disulfide loaded Pt particle composite electrocatalyst. Wherein the molybdenum disulfide nanosheets are of a vertical arrangement structure and have abundant edge sulfur sites, and the high-activity edge sulfur sites and Pt particles have a synergistic effect, so that the reaction potential barrier of water molecule dissociation is effectively reduced. Meanwhile, the generation rate of hydrogen is increased through the active sulfur sites. The overpotential of the material is only 35 mV under the current density of 10 mA cm <-2 >, and the material can stably operate for more than 110 h under the current density of 20 mA cm <-2 >. By combining metal active sites and high-activity non-metal sites, dissociation of water molecules and generation of hydrogen are promoted, and the hydrogen evolution reaction performance in an alkaline medium is remarkably improved.

The application relates to the technical field of carbon dioxide electro-reduction catalysts, and discloses a preparation method of a supported copper nitride catalyst, which comprises the following steps: mixing copper cyanamide and conductive carbon material and performing ball milling; the rotating speed of the ball milling is 500 r / min-5000 r / min, and the ball milling time is 1h-24h; the mass ratio of the copper cyanamide and the conductive carbon material is 1-10:1-10. The catalyst obtained by the method has better stability, selectivity and activity in a carbon dioxide electro-catalytic reduction reaction, and the addition of the conductive carbon improves the conductivity of the catalyst, so that the overpotential of the catalyst in the carbon dioxide electro-reduction is significantly reduced.

The invention provides a method for optimizing a foam metal electrode of a hydrogen electrolysis cell, and belongs to the technical field of electrochemistry, the method comprises the following steps: material selection and structural design: task definition: selecting a proper foam metal material, such as nickel-based, iron-based or copper-based foam metal, according to the requirement of hydrogen production by electrolysis of water, and selecting a proper foam metal material, such as nickel-based, iron-based or copper-based foam metal, according to the requirement of hydrogen production by electrolysis of water; the materials need to have good conductivity and corrosion resistance; structural optimization: the pore structure of the foam metal electrode is designed, and an efficient electrocatalyst (such as platinum and iridium oxide) is loaded on the surface of the foam metal by adopting an electrodeposition, impregnation or chemical vapor deposition technology, so that the electrocatalytic activity of the electrode is remarkably improved, the overpotential of a hydrogen evolution reaction is reduced, the electrochemical reaction rate is further increased, the hydrogen production efficiency is improved, and the hydrogen production efficiency is improved. The catalyst deposition method ensures the uniformity and controllability of the catalyst layer, so that the electrochemical reaction is more efficient.

The utility model relates to a hydrogen production device which comprises a steam generation device and a steam electrolysis device, liquid water is firstly heated to form steam, then the steam is directly electrolyzed, the problem that an electrolysis unit is polluted by water is avoided, and the service life of the electrolysis unit is prolonged; the utility model further relates to an energy multi-stage utilization device, waste heat generated in the electrolysis process is used for heating water, and the electrolysis efficiency is improved.

The invention discloses a preparation method and application of a porous iridium nano-metal catalyst, and belongs to the field of material synthesis and electro-catalysis. Iridium acetylacetonate and copper acetylacetonate are used as precursors, an IrCu alloy nanosphere precursor is prepared through solvothermal reaction in an ethylene glycol and surfactant system, copper is removed through acid etching, and the porous iridium nano spherical catalyst (Ir-NS) is obtained. The catalyst has a three-dimensional porous spherical structure, active sites are concentrated on the surfaces of nanospheres and the edges of the walls of internal mesopores, catalytic active sites are enhanced due to the iridium nanosphere structure and uniform site exposure density, oxygen bubbles are quickly released, and the active sites are prevented from being covered by the bubbles. In an acid medium and proton exchange membrane water electrolysis anode oxygen evolution reaction, the catalyst shows low overpotential and long-term operation stability under low iridium loading capacity. The method is simple in process and low in cost, does not need an additional hard template, and has a good industrial application prospect.

This invention discloses a carbon-coated iron porous aerogel, its preparation method, and its application in lithium metal anodes, belonging to the field of lithium metal anode material preparation. The carbon-coated iron porous aerogel of this invention constructs a continuously conductive and highly stable carbon-based porous three-dimensional framework through the synergistic effect of two-dimensional graphene oxide, one-dimensional carbon nanotubes, and carbon-coated iron units. The NaCl hard template effectively amplifies the macropore size and increases the number of pores, providing interconnected channels for the rapid wetting and spontaneous climbing of molten lithium. The carbon-coated iron interface serves as a stable lithiophilic site, inducing uniform nucleation of lithium metal and restricting disordered growth, thereby achieving stable confinement of lithium metal in the composite electrode.

The invention belongs to the technical field of electrocatalytic hydrolysis, and particularly relates to a preparation method and application of high-activity NiCe (OH) n / NF. A noble metal catalyst is not used, so that the use cost is greatly reduced. The positive electrode obtains glucaric acid in an electrooxidation mode, meanwhile, the active center NiOOH can stably exist in an alkaline environment in a circulation mode, and the negative electrode produces hydrogen. And due to the redox cycle between Ni (OH) 2 and NiOOH, the overpotential can be effectively reduced, and the electric energy loss is reduced. And due to the synergistic effect of a small amount of cerium, the system can realize high-efficiency hydrogen production while obtaining the glucaric acid with high additional value. According to the method, glucose is catalyzed by using a circulating system to obtain glucaric acid, meanwhile, the anode glucose yield reaches 70%, and the cathode hydrogen evolution efficiency is close to 100%. Compared with a traditional water electrolysis hydrogen production process, the glucose oxidation assisted low-potential couple circulation coupling hydrogen production method conforms to'green chemistry 'and is lower in cost, and harsh reaction conditions and complex separation steps are avoided.

The present invention relates to an electrochemical carbon dioxide conversion system, which includes: a first electrode; a second electrode; and a separator membrane positioned between the first electrode and the second electrode, being porous and comprising a first layer and a second layer having different average pore sizes.

The invention discloses a C, N-FeNbO4 / NF microrod based on foamed nickel in-situ 001 crystal face derivation and a derivation method and application thereof, and the method comprises the following steps: in a hydrothermal reaction, hydrolyzing urea to release OH-to replace oxalate in niobium oxalate so as to form a Nb-OH monomer; meanwhile, Fe < 3 + > is hydrolyzed into Fe (OH) 3 colloid; the preparation method comprises the following steps: performing liquid phase nucleation on Nb-OH and Fe (OH) 3 under a hydrothermal condition to form a FeNbO4 precursor, and growing the FeNbO4 precursor on foamed nickel (NF) in situ; in this way, the 001 crystal face of FeNbO4 is accurately regulated and controlled through the strong coordination effect of F <-> to form a rod structure. Under high-temperature (900 DEG C) carbonization, the FeNbO4 is further crystallized into an acid-resistant and alkali-resistant monoclinic crystal type three-dimensional microrod (C, N-FeNbO4 / NF) with C and N co-doped (C, N-FeNbO4) composite NF. According to the method disclosed by the invention, the agglomeration phenomenon of FeNbO4 is relieved; the microrod structure exposes more catalytic active sites, so that the catalytic activity is improved. In addition, the catalyst shows high conductivity by co-doping C and N with synergistic high-conductivity NF. Based on the regulation and control, the C, N-FeNbO4 / NF shows good electrochemical performance in the oxygen evolution reaction.

The invention relates to the technical field of hydrogen fuel cells, and discloses a hydrogen fuel cell reverse process testing device, which comprises an equipment body, and four groups of equipment gas inlet pipelines, two groups of gas mixing tanks, a water vapor generator, a cooling water tank, an air heating furnace and a mixed gas heating furnace are sequentially arranged in the equipment body from top to bottom; through cooperation of a galvanic pile heating furnace temperature controller, an equipment gas inlet pipeline, a gas mixing tank, a water vapor generator and a cooling water tank, different gases are respectively introduced into the gas mixing tank for heating by utilizing the equipment gas inlet pipeline, so that the heated gases are mixed with water vapor and then are introduced into a cathode and an anode of a galvanic pile, and the accuracy of a measurement structure is ensured; and the SOEC electrolytic tank can accelerate the electrode reaction rate at high temperature, so that the overpotential of the cathode and the anode is obviously reduced, the energy loss in the electrolysis process is effectively reduced, and the power utilization cost is reduced.

The application provides a self-supporting Ni-Fe-Mn oxygen evolution electrocatalyst and a preparation method thereof, and belongs to the technical field of catalytic material preparation. The Ni, Fe and Mn metal raw materials are repeatedly smelted, and after smelting, suction casting is carried out to obtain a cast plate. The cast plate is subjected to homogenization treatment, and then is cut and polished. Finally, etching is carried out in a nitric acid solution to obtain the self-supporting Ni-Fe-Mn oxygen evolution electrocatalyst. The self-supporting electrocatalyst is prepared by the method of arc smelting, heat treatment and chemical etching, and has the advantages of simple preparation process, easy industrialization, adjustable size, excellent stability and excellent OER performance.

The invention provides a titanium dioxide nanosheet loaded iridium dioxide nanoparticle catalyst as well as a preparation method and application thereof. In an XRD (X-Ray Diffraction) spectrogram of the catalyst, a characteristic peak of titanium dioxide with an anatase structure and a characteristic peak of iridium dioxide exist. The preparation process of the catalyst is characterized in that reduction of a titanium source and complexation of an iridium element are realized by using a simple sol-gel method, and a complexed metal precursor is calcined to form a composite metal oxide. When the prepared material is used as a proton exchange membrane (PEM) acidic electrolytic cell anode catalyst, titanium dioxide is resistant to corrosion and has a large specific surface area, and compared with traditional commercial iridium black and iridium oxide catalysts, the prepared catalyst has the advantages of being low in cost, high in activity and long in durability.

The application discloses a preparation method of a single-crystal metal lithium negative electrode. The single-crystal metal lithium negative electrode with a dense packing surface Li(110) is obtained by annealing a polycrystal metal lithium foil horizontally placed after being heated in vacuum or inert atmosphere, and is directly used for battery assembly. The application remarkably improves the electrode reaction process kinetics of the metal lithium negative electrode by reducing the self-diffusion barrier of the surface of the metal lithium negative electrode, widens the safety boundary of the metal lithium negative electrode, and enables the metal lithium negative electrode to have no dendrite growth in a practical current density range. The prepared single-crystal metal lithium negative electrode can be directly used for battery assembly, and remarkably improves the cycle stability and safety of a high-specific-energy metal lithium battery, and promotes the development of practical high-safety metal lithium batteries.