53results about How to "Low onset potential" patented technology

The invention discloses a bi-metal layered hydroxide chelated Ti3C2-MXene catalyst as well as a preparation method and an application thereof, and relates to the technical field of electrochemistry. The preparation method of the bi-metal layered hydroxide chelated Ti3C2-MXene catalyst comprises following steps: Ti3AlC2-MAX is taken as a raw material, and Ti3C2-MXene is obtained with a LiF+HCl stripping method; hydroxide of Fe and Co is mixed with Ti3C2-MXene, the mixture is heated to 120 DEG C under protection of Ar gas and kept at the temperature for 3 h, and FeCo-LDH/Ti3C2-MXene is obtainedby centrifugation and 60-DEG C vacuum drying. The preparation of the bi-metal layered hydroxide compound is simple and safe to operate, a glassy carbon electrode supported with the FeCo-LDH/Ti3C2-MXene compound is taken as a working electrode, the electro-catalysis of hydrogen evolution process by cathodic water oxidation is studied, the initial potential is lower, and hydrogen output is larger.

The invention discloses a FeCo/MXene compound, and a preparation method and application thereof. The method comprises the following steps: taking a MAX phase of a ternary stratified material as a rawmaterial, and repeatedly carrying out washing and centrifuging by an etching method to obtain multi-layer MXene in the lower-layer liquid and obtain few-layer MXene in the upper layer liquid; and mixing water solutions of ferric salt, cobalt salt and urea with a dispersion liquid of the few-layer MXene, carrying out heating under protection of nitrogen, carrying out stirring for reacting, and centrifuging and washing the obtained reactant to obtain the FeCo/MXene compound. The method for preparing the MXene has the advantages that operation is simple and safe, a glassy-carbon electrode supporting the FeCo/MXene compound is used as a working electrode to research a process of electrocatalysis of anode water oxidation, the initial potential is low, and the catalytic effect is good.

The invention relates to a method for preparing a nitrogen-doped graphene material in an electrochemical stripping mode.The method includes the following specific steps that firstly, graphite is subjected to electrochemical stripping in a nitrogen-containing precursor; then, nitrogen-doped expanded graphite is prepared through thermal processing; finally, the nitrogen-doped expanded graphite is subjected to electrochemical stripping in inorganic electrolyte.The method has the advantages that the nitrogen-doped graphene prepared through the method is good in electrical conductivity and water dispersion performance; the preparation process is simple, convenient, easy to implement and free of pollution; when an electrode modified by the material is used as an electrocatalyst for a fuel cell cathode oxygen reduction reaction, the initial electric potential is low, current density is large, methanol resistance is good, and the electro-catalytic property of the material is close to that of a commercial Pt/C catalyst.

The invention discloses a N-doped carbon-loaded double-scaling transition metal phosphide and a preparation method and application thereof. Cobalt sources are introduced into a laminate and the interlayer of the phosphide at the same time, and CoP/CoP2 with the smaller granular size and CoP/CoP2 with the extremely small quantum points can be obtained after combustion phosphorization is conducted,and thus the catalytic efficiency is enhanced. In addition, carbon sources are introduced into Al2O3 generated by the laminate and the interlayer, the double confinement effect effectively stops agglomeration and volume expansion effects of the nanometer particles, so that the overpotential of the oxygen evolution reaction is greatly lowered, and the catalytic efficiency is further improved.

The invention belongs to the technical field of electrocatalysis of hydrogen evolution, and discloses a core-shell CoS2@NG nanometer composite material with high performance, low cost, rich resources and excellent electrocatalytic performance of hydrogen evolution, and preparation and application thereof. The preparation method provided by the invention comprises the following steps: subjecting a growth solution of CoS2 to a hydrothermal process so as to obtain core-shell CoS2 nanoparticles; then mixing the core-shell CoS2 nanoparticles with APS in a solvent, and carrying out stirring so as to obtain APS-modified core-shell CoS2 nanoparticles; and placing the APS-modified core-shell CoS2 nanoparticles in a nitrogen doped graphene oxide precursor solution, and carrying out a hydrothermal process so as to obtain the composite material, wherein the precursor solution is composed of the following components: graphene oxide, ammonia water and sodium hydroxide. The composite material provided by the invention has good mechanical flexibility, excellent electrocatalytic performance, electrocatalytic activity of hydrogen evolution and stability, shows low onset potential, low overpotential and high cycling stability, can be applied to the field of electrocatalytic activity of hydrogen evolution, and provides a solution method for the problem of electrocatalysis of hydrogen evolution in the prior art.

The invention relates to a preparation method of co-doped graphene gel by bonding of metal and nitrogen. The preparation method comprises the following steps of carrying out joint hydrothermal crosslinking on graphene oxide, a crosslinking agent and a metal precursor, and carrying out calcination after drying. The preparation method has the advantages that the graphene gel prepared according to the method is stable in structure, the material has excellent electro-catalytic property on oxygen reduction reaction of a negative electrode of a fuel cell by a bonded doping structure, the electrode modified with the material is low in initial potential, large in current density and high in methanol resistance, and the electro-catalytic property of the material exceeds that of a commercial Pt/C catalyst.

The invention discloses a method for manufacturing a fuel cell capable of synthesizing acetic acid simultaneously, which comprises the following main steps of: adding ethylene diamine tetraacetic acid (EDTA) serving as a complexing agent, formaldehyde serving as a reducing agent and solution of PdCl2 or PdCl2 and RuCl3 into a hydrothermal reactor, performing heating reaction, and cooling to obtain PdRu or Pd nanometer catalyst particles; mixing the PdRu or Pd nanometer catalyst particles and VulcanXC-72 to obtain carbon-loaded PdRu or Pd catalyst particles; mixing the carbon-loaded catalyst particles and polytetrafluoroethylene uniformly in ethanol, and performing ultrasonic dispersion to form paste; coating the paste on a stainless steel mesh uniformly, drying and pressurizing to obtain Pd and PdRu nanometer porous electrode plates; and assembling the fuel cell by using the Pd electrode plate as a cathode and the PdRu electrode plate as an anode, wherein electrolyte of an anode chamber and electrolyte of a cathode chamber are respectively sodium hydroxide solution of the ethanol and sulfuric acid solution of hydrogen peroxide and are separated by a positive ion membrane. The method is simple and has readily available materials, and the acetic acid can be synthesized while the fuel cell is used.

The invention discloses a preparation method of a carrier by using saccharide and urea and Pt-Ni/NC catalyst with high performance for ethanol oxidation through hydrothermal synthesis on the carrier and a metal salt solution in a one-step method, and particularly relates to preparation of ethanol oxidation-electro-catalyst which is obtained by synthesizing sucrose (glucose) into a carbon carrier,adding the urea to realize doping of nitrogen, performing hydrothermal reaction and a metal salt solution and performing synthesis to obtain the catalyst, and then carbonizing the urea. The preparation method comprise the following main steps: firstly, adding the sucrose (glucose) and the urea into deionized water and then performing mixing to obtain a mixed solution; mixing a nickel chloride aqueous solution with a chloroplatinic acid aqueous solution according to a mass ratio to obtain a mixture; then adding the mixture into the mixed solution; regulating pH by using a sodium hydroxide aqueous solution, then performing ultrasonic treatment to enable the mixed solution to be evenly mixed; finally, putting into a polytetrafluoroethylene high-temperature high-pressure reaction kettle and carrying out hydrothermal reaction; cooling to a room temperature, then performing suction filtration and washing on the reacted solution to obtain a product; drying the obtained product in a vacuum drying box; carbonizing the obtained powder in a tubular furnace at a high temperature to obtain the spherical Pt-Ni/NC catalyst. Under an acidic condition, the Pt-Ni/NC catalyst prepared by the method disclosed by the invention has strong electro-catalytic oxidation activity and stability on ethanol, and the current density of the Pt-Ni/NC catalyst can reach 500mA.mg-1Pt; moreover, the Pt-Ni/NC catalyst is environmentally friendly and is free of pollution, and is relatively low in cost; therefore, the catalyst is a high-performance catalyst which can be directly applied to anodes of direct ethanol fuel cells.

The invention discloses a spherical molybdenum disulfide/copper sulfide nanometer composite material and a preparation method thereof, and belongs to the technical field of nanometer materials. According to the invention, in a preparation process, a multilayer hierarchical spherical and solid spherical molybdenum disulfide/copper sulfide nanometer composite material is prepared by changing a massratio of a thiourea solvent to copper nano-wires, thiourea and an ammonium molybdate precursor through a simple and efficient one-step solvothermal method, and is applied to catalysis of carbon dioxide; and the preparation process of the spherical molybdenum disulfide/copper sulfide nanometer composite material can be simplified, and the performance of the composite material in catalytic application is further improved.

The invention discloses a double-carbon-confined iridium nanocluster catalyst and a preparation method and application thereof. The double-carbon-confined iridium nanocluster catalyst is a composite material formed by dispersing iridium nanodots on a carbon matrix, and the carbon matrix is graphene oxide and S-doped mesoporous carbon. Ultra-small nano-sized iridium nanoclusters are prepared through the double confinement effect of two carbon groups, and the aggregation of iridium nano-particles can be effectively prevented. The finally obtained catalyst has large specific surface area, the active sites of the catalyst are increased, the overpotential and Tafel slope of electrolytic water reaction are greatly reduced, the performance of the catalyst is effectively improved, and the catalysthas long service life and good stability. In addition, the preparation method of the catalyst is simple, the raw materials are cheap and readily available, the reserves are abundant, the preparationprocess is simple and easy to operate, and the catalyst is a catalyst with practical value for electrolyzed water.

The invention relates to application of a trinickel disulfide electrode material to electro-catalytic oxidation of hydrazine hydrate and belongs to the field of an electro-catalytic oxidation electrode material. Trinickel disulfide provided by the invention is used as an electrode active material and is used for related application to the electro-catalytic oxidation of the hydrazine hydrate of a hydrazine hydrate fuel cell anode and a hydrazine hydrate electrochemical sensor electrode. When the trinickel disulfide is used for a hydrazine hydrate fuel cell anode material, the trinickel disulfide has the advantages of high current density, low onset potential and durability; when the trinickel disulfide is used as a hydrazine hydrate electrochemical sensor electrode material, the trinickel disulfide has the advantages of high sensitivity, high linear responses, high stability and good anti-interference capability. The trinickel disulfide electrode material is low in price and good in properties and has a relatively good actual application value.

The invention discloses a 1T-MoS2/NiS heterogeneous interface structure catalyst for electro-catalytic hydrogen evolution as well as a preparation method and application of the 1T-MoS2/NiS heterogeneous interface structure catalyst. The preparation method comprises the following steps: firstly, preparing a metal nickel nanosheet in one step by a solvothermal method, and then growing a 1T-MoS2 nanosheet array on the surface of a nickel nanosheet 2D structure as a skeleton in situ to obtain the 1T-MoS2/NiS nano catalyst with a heterogeneous interface structure. The preparation method disclosed by the invention has the advantages of low equipment requirement, easily controlled reaction conditions, low raw material cost and the like; the nanometer catalyst is constructed from a new angle, and the prepared 1T-MoS2/NiS heterogeneous interface structure catalyst can be used for efficiently electrolyzing water, has the advantages of low overpotential, good stability and the like in hydrogen evolution under an alkaline condition, and shows a good application prospect of electro-catalytic hydrogen production.

The invention relates to a preparation method of a direct ethanol fuel cell anode catalyst, and belongs to the technical field of fuel cells. The preparation method is characterized in that glucose isused as a raw material for preparing carbon spheres used as a carrier, and manganese dioxide is loaded to replace part of platinum, and on that basis, the efficient and low-cost catalyst is prepared;and meanwhile, rare earth elements are doped, so that electrons are easily excited and transferred from a conduction band, thus oxygen vacancy is promoted to develop, and the oxygen vacancy concentration of the catalyst is greatly increased, and as a result, the ion conductivity is improved; in addition, the crystal size of the material is reduced due to low synthesizing temperature; the C-C breaking efficiency under low temperature is improved. According to the method, TiO2 and Pt are coordinated to improve the catalyzing performance of the catalyst; and meanwhile, a CO type intermediate product produced by ethanol oxidizing is easily transferred to the TiO2 nanoparticle surface to be oxidized; the catalyzing activity and stability of the catalyst are improved while the Pt content is decreased; and moreover, the initial potential of the ethanol starting to oxidize is reduced; high current density is obtained, and as a result, the fuel cell performance is improved.

The invention provides a backlight type photoelectric anode and a preparing method and application thereof. The photoelectric anode comprises a substrate, an activated transition metal film covering one side of the substrate, a transition metal catalyst layer covering the activated transition metal film, and a first electrode connected with the substrate. The photoelectric anode preparing method comprises the following steps that firstly, the transition metal film is prepared on one side of the substrate; secondly, the transition metal film in the first step is activated, and the activated transition metal film is obtained; thirdly, the transition metal catalyst layer is prepared on the transition metal film activated in the second step; and fourthly, the first electrode is prepared on thesubstrate, and the photoelectric anode is obtained. The photoelectric anode is used for photoelectrochemistry water decomposition. According to the provided photoelectric anode, the technical effectsthat the initial potential of a photoelectrochemistry electrode is obviously reduced, and the photoelectric current density is improved are achieved; and the backlight type photoelectric anode preparing method meets the industrial production requirement.

The invention discloses a preparation method of a nitrogen doped platinum-nickel bimetallic catalyst for ethanol oxidation with a cubic structure. The method comprises the following steps: glucose, urea, nickel nitrate and a chloroplatinic acid solution are mixed in a beaker, the materials are prepared into an aqueous solution, drying is carried out, calcining is carried out in a high temperaturetubular furnace under a nitrogen atmosphere, an obtained sample is grinded into particle-free powder, and the platinum-nickel bimetallic catalyst is obtained. The nitrogen doped platinum-nickel bimetallic catalyst has excellent electrocatalytic oxidation activity for ethanol in a potassium hydroxide solution, stability is good, preparation cost is low, and the product is a novel high performance catalyst for direct ethanol fuel cell anode.

The invention relates to an electrode for an alkaline water electrolysis total battery, and a preparation method of the total battery. The total battery comprises a water electrolysis tank body, whichis divided into a cathode cavity and an anode cavity by a diaphragm, wherein the cathode cavity and the anode cavity are not communicated with each other, a cathode and an anode are respectively arranged in the cathode cavity and the anode cavity, the diaphragm is a sulfonated polyetherketone ion exchange membrane, and the anode is a hydrated cobalt-nickel sulfide nanosheet or a hydrated cobalt-nickel sulfide strip generated on the surface of a nickel-based substrate in situ. According to the invention, the electrode with the structure has the characteristics of high surface roughness and large electrochemical reaction area; due to the existence of the two-dimensional nanosheets, electron transfer and substance transfer can be promoted, and more reaction active sites can be provided for water electrolysis reaction, so that the initial potential of OER is reduced, and the speed of the water electrolysis reaction is increased; and the performance of the substrate Ni is stable in an alkaline environment, and the structure of the nickel sulfide is stable due to the doping of the Co element, so that the structure and the catalytic performance of the nickel sulfide are kept stable in the continuous water electrolysis process.

The invention belongs to the field of an electrochemical electrode material, and relates to a preparation method of a high-activity electrode having a trace-precious-metal-modified surface of a bimetal nanocomposite material. The preparation method comprises: taking chloroplatinic acid and nickel nitrate as raw materials, adopting a chemical reduction method to prepare Pt1Ni3 nanoparticles, loading the Pt1Ni3 nanoparticles on carbon black to obtain a Pt1Ni3/carbon black composite material, coating a glassy carbon electrode with the Pt1Ni3/carbon black composite material, drying the obtained product at the room temperature to obtain a Pt1Ni3/carbon black electrode, taking the Pt1Ni3/carbon black electrode as a working electrode, and in a chloroauric-acid-containing sulfuric acid solution, in a constant potential condition, reducing Au and depositing Au on the surface of Pt1Ni3 nanoparticles to prepare a trace-Au-modified Pt1Ni3/carbon black electrode, which has high catalytic activity to a glycol oxidation reaction in an alkaline medium. The prepared electrode has obvious advantage with respect to catalytic activity and cost, and has bright application prospects.

The invention provides a FeCu-N-HC nanosphere catalyst and a preparation method thereof, and belongs to the field of air battery catalytic materials. The preparation method comprises: firstly formingFeCu-N coordination, physically mixing NaCl and SiO2 nanosphere templates, then preparing the FeCu-N6-containing hollow carbon nanospheres through carbonization, and the BET specific surface area being 610 m<2> g<-1>. Due to the fact that the Fe-Cu synergistic coordination ligand is formed firstly, when oxygen reduction catalysis is conducted on the finally-prepared FeCu-N6, the catalysis steps can be effectively shortened, and the catalysis rate of active sites is increased. The FeCu-N-HC hollow carbon nanosphere prepared by the method is used as an oxygen reduction catalyst, and the catalytic performance and the stability of the FeCu-N-HC hollow carbon nanosphere are superior to those of a current commercial 20% Pt/C catalyst.

The invention discloses a method for preparing an Au@InP nanopore array photo-anode plate material. The method comprises the steps that firstly, an InP wafer is adopted as a substrate, and a one-dimensional ordered InP nanopore array through an anodic oxidation method in combination with wet etching; and then the one-dimensional ordered InP nanopore array is adopted as a template, the InP nanoporearray is evenly loaded with Au nano particles through a dipping electrochemical deposition method, and therefore the Au@InP nanopore array complex structure photoelectrolysis water photo-anode platematerial is constructed. According to the Au@InP nanopore array complex structure, the contact area of a heterojunction can be greatly increased, and meanwhile reactivity sties can be greatly increased. High light current density, low take-off potential and excellent photon-generated carrier separation capability are achieved. Operation is flexible and easy, the reaction conditions are mild, and cost is low. Obtained Au nano particles are good in size uniformity, easy to regulate and control and suitable for large-scale production and has good application prospects.

The invention discloses applications of ultrathin palladium sheets in promotion of carbon dioxide electroreduction. According to the invention, solution thermal method is adopted, reducing agent and surfactant kind, using amount, and reaction time are regulated, so that synthesis of regular hexagonal palladium sheets is realized, the ratio of different sites is calculated, experiment and density functional theory calculation are combined, and study on activity increasing site sources is carried out. The growth method of the hexagonal ultrathin palladium sheets is simple in operation; reactionconditions are mild; the preparation process is controllable; the repeatability is high; no large equipment is needed; economical benefit is excellent; the prepared material is excellent in carbon dioxide reduction performance; and certain industrial value is achieved.

A composite bismuth vanadate photoelectrode comprising a bionic manganese-core cubane catalyst and a preparing method thereof are disclosed. The composite photoelectrode includes bismuth vanadate nanosheets and the bionic manganese-core cubane catalyst Mn4O4 loaded on the nanosheets. The method includes firstly preparing a bismuth vanadate photoelectrode, then preparing bionic manganese-core cubane powder, dissolving the powder into a dichloromethane solution, and then coating the bismuth vanadate photo-anode with the solution in a droplet coating manner to prepare the composite bismuth vanadate photoelectrode. The catalyst is loaded on the bismuth vanadate photo-anode so that surface water oxidation kinetics can be effectively accelerated, thus effectively improving the photoelectric converting efficiency. The composite bismuth vanadate photoelectrode has a wide application prospect in photocatalytic water decomposition, artificial photosynthesis and other fields. The preparing methodis simple, low in cost and high in operability.