53 results about "Electro catalyst" patented technology

The invention discloses an electrocatalyst activity attenuation prediction method based on microdynamics, and relates to the field of electrochemical catalyst.According to the electrocatalyst activity attenuation prediction method based on microdynamics, an electrocatalytic reaction and an inactivation reaction are dynamically coupled in a microdynamics model for the first time, the limitation of traditional thermodynamic stability analysis is broken through, and the activity attenuation process under the working condition can be truly reflected. By introducing a residual active site coverage variable and adopting quasi-steady-state approximation, the modeling and solving problems of a dynamic process of continuous loss of active sites are successfully solved, and a complex rigid differential equation set is simplified into an analyzable linear problem. The method not only can predict a stability attenuation curve, but also can quantitatively diagnose key steps influencing the service life through half-life period control degree analysis, realizes crossing from'phenomenon prediction 'to'mechanism interpretation' and'reverse design ', and provides a powerful theoretical tool for rationally designing a high-stability electrocatalyst.

The invention is applicable to the technical field of environmental engineering and groundwater remediation, and particularly relates to a method for remediating antibiotic-polluted groundwater based on a stabilized piezoelectric material, which comprises the following steps: preparing piezoelectric catalyst powder; preparing a piezoelectric catalytic fluid; determining groundwater remediation parameters through experimental simulation, wherein the groundwater remediation parameters comprise injection parameters and ultrasonic parameters; constructing a reaction area, and injecting the piezoelectric catalytic fluid into the polluted area based on the injection parameters; an ultrasonic generating device is arranged above the polluted area; and transmitting ultrasonic waves to the polluted area to finish groundwater remediation. On the premise that the stratum structure is not damaged, long-distance effective migration of the catalyst in the porous layer and precise construction of the in-situ permeable reaction area are achieved, the engineering problem that large-scale excavation or production halt treatment cannot be conducted in the pharmaceutical and chemical industrial park is solved, and harmony of underground water remediation and safe production of the park is achieved.

The application relates to a ligand-regulated CuCe-MOF catalyst and a preparation method and application thereof in an electrocatalytic CO2 methane production reaction, and the preparation method comprises the following steps: mixing a Ce solution, an organic ligand solution and a structure directing agent to obtain a mixed solution; the organic ligand is terephthalic acid, 1,4-naphthalene dicarboxylic acid, diphenyl dicarboxylic acid or triphenyl dicarboxylic acid; the mixed solution is centrifuged and dried to obtain a cerium-based metal organic framework powder; the cerium-based metal organic framework powder is dispersed in a third solvent, ultrasonated, and soluble Cu salt is added, and after stirring, the third solvent is volatilized by heating to obtain the CuCe-MOF catalyst. The CuCe-MOF is prepared by using the organic ligand with a single benzene ring, a double benzene ring and a triple benzene ring, the dual synergistic optimization of ligand electronic effect and protonation efficiency is realized, the methane selectivity is greatly improved in the CO2 electro-reduction, and a brand-new synergistic regulation strategy is provided for the structural design and performance optimization of a CO2 RR electro-catalyst.

The invention relates to the technical field of blood glucose detection, and particularly discloses a blood glucose monitoring method based on the content of glucose in saliva, which comprises the following steps: contacting a pretreated sample with a monitoring system, and connecting with an electrochemical workstation through the monitoring system, setting the working potential of the monitoring system through an electrochemical workstation, collecting the electric signal change of the monitoring system, and calculating the glucose content in the saliva according to the electric signal change so as to deduce the blood glucose level; and the monitoring system comprises a Ni5P4-FeP / Ti electrocatalyst. By adopting the technical scheme, the saliva pH environment can be met, the detection limit and precision meet the accurate glucose detection requirement, and the detection operation is simple.

Hybrid electrocatalyst layers for use in an electrochemical cell and processes for making the same are described. The hybrid electrocatalyst layers include at least one ion-conducting layer and at least one nonionic conductive catalyst layer. The processes for making the hybrid electrocatalyst layers include a sintering step, which provides greater durability of the hybrid electrocatalyst layers.

The invention relates to the technical field of electrocatalytic materials, in particular to a SnSe piezoelectric catalyst and a preparation method and application thereof. The preparation method comprises the following steps: dispersing selenium powder in deionized water, adding NaBH4 powder to obtain a selenium source precursor solution, dispersing sodium ascorbate in deionized water, adding anhydrous SnCl2 powder to obtain a tin source precursor solution, and adding the selenium source precursor solution into the tin source precursor solution to obtain a mixed solution; the pH value of the mixed solution is adjusted to 2-7, then the mixed solution is subjected to a hydrothermal reaction, and the SnSe piezoelectric catalyst is obtained through filtering and drying in sequence. In a one-step hydrothermal system, through coordinated regulation and control of pH and hydrothermal temperature, coordinated regulation of the SnSe material in the aspects of nucleation, growth, valence evolution and defect structure is realized, a novel piezoelectric catalytic material with a mixed valence structure and nanorod morphology is successfully constructed, the piezoelectric polarization capability, the carrier separation efficiency and the ROS generation capability of the material are remarkably enhanced, and the preparation method is simple and easy to implement. And excellent organic pollutant degradation performance is obtained.

The invention belongs to a functional composite material, and provides a RuO2 / C functional composite material as well as a preparation method and application thereof in order to solve the technical problem of low CO2 conversion efficiency of a thermoelectric catalyst of an existing CO2 / H2 fuel cell cathode. The RuO2 / C functionalized composite material comprises carbon spheres, RuO2 particles are attached to the surfaces of the carbon spheres, the surfaces of the RuO2 particles are coated with carbon layers, and unpaired electrons exist on the surfaces of the carbon layers and the surfaces of the carbon spheres. According to the composite material disclosed by the invention, the surfaces of the carbon layer and the carbon spheres have rich unpaired electrons, and CO2 can be effectively adsorbed and activated in a specific CO2 / H2 fuel cell thermal field environment.

The invention discloses a method for constructing high-dispersion high-entropy metal oxide nano-particles by using ligand synergistic anchoring and application of the high-dispersion high-entropy metal oxide nano-particles, hexagonal boron nitride is used as a carrier, stripping is realized through thermal expansion-liquid nitrogen quenching circulation, nitrogen defects are introduced, a synergistic coordination field is formed by using organic polydentate ligands and defect sites, and the high-dispersion high-entropy metal oxide nano-particles are obtained. The preparation method comprises the following steps of: performing synchronous anchoring and uniform dispersion on a plurality of metal ions by virtue of a functional carrier, performing mixing-ball milling activation treatment on a plurality of metal salts and the functional carrier, and combining multi-stage programmed pyrolysis of low-temperature confinement nucleation-high-temperature interface bonding-structure stabilization, so as to form the high-entropy metal oxide nano-particles with the particle size of about 10-100nm under the regulation and control of a dynamic atmosphere. According to the method, metal precursor migration, particle sintering and element segregation can be effectively inhibited, and high-dispersion loading and stable interface construction of the high-entropy metal oxide are achieved. The obtained catalytic material shows relatively high conversion rate and ammonia selectivity in a reaction for preparing ammonia by electro-catalysis nitrate reduction, and is suitable for preparing a high-performance electro-catalyst.

The application discloses a Cu-As nanometer composite electrocatalyst with cross dispersion among different components and a one-step electrodeposition preparation method thereof, and is characterized by the following method: a three-electrode system is used, a saturated mercury electrode is used as a reference electrode, a platinum sheet is used as a counter electrode, and carbon cloth is used as a working electrode; an electrolyte contains HCl, CuCl2.2H2O and NaAsO2; a chronocoulometric electrochemical technology is used for electrodeposition at a constant potential; the deposited material is sequentially rinsed with deionized water and anhydrous ethanol; and finally, drying is performed to obtain the Cu-As nanometer composite electrocatalyst with cross dispersion among different components. The application realizes controllable preparation of the nanometer composite electrocatalyst with controllable cross dispersion of Cu and As components, and has important significance for simplifying a process, improving material performance and promoting the development of electrochemical energy technology.

The application discloses a preparation method of an unsaturated coordination boron-doped nickel-based metal organic framework material, which comprises the following steps: (1) stirring and dissolving a nickel salt, 1,4-benzenedicarboxylic acid and 4-carboxyphenylboronic acid in a solvent to obtain a precursor solution; and (2) adding triethylamine into the precursor solution obtained in the step (1) to obtain the unsaturated coordination boron-doped nickel-based metal organic framework material. The application further discloses the unsaturated coordination boron-doped nickel-based metal organic framework material prepared by the preparation method and application of the unsaturated coordination boron-doped nickel-based metal organic framework material in an electric reduction O2 production H2O2 reaction. The application of the catalytic material as an electric catalyst in the electric reduction O2 production H2O2 reaction in an alkaline electrolyte. The catalytic material exhibits excellent two-electron electric reduction O2 production H2O2 activity and selectivity in the alkaline electrolyte, and has good catalytic stability.

The invention discloses an oriented design and screening method of a nitrogen-doped MXene supported non-noble electrocatalyst for a hydrogen fuel cell, and the oriented design and screening method comprises the following steps: 1, by taking Ti3C2O2 MXene as a carrier, selecting nitrogen atoms to replace and dope through lattice carbon sites, and constructing a series of N / C proportion electrocatalyst models; and 2, carrying out thermodynamic stability and catalytic activity analysis on the series of N / C ratio electrocatalyst models, and screening out an electrocatalyst model with optimal stability and activity to obtain the nitrogen-doped MXene supported non-noble electrocatalyst. According to the directional design and screening method, Ti3C2O2 MXene is used as a carrier to construct a series of N / C proportional electrocatalyst models doped with nitrogen, and two indexes of thermodynamic stability and catalytic activity are combined for common screening, so that the research and development period is effectively shortened, both activity and stability are considered, and the method is suitable for the field of preparation of electrochemical catalysts.

The invention relates to a method for the selective electro-oxidative fragmentation of lignin using an electrochemical system, comprising the following steps: (i) synthesis of a nickel-cobalt electrocatalyst; (ii) obtaining an anode coated with the electrocatalyst; and (iii) selective fragmentation and oxidation of solubilised lignin in an electrochemical reactor comprising said anode, in which vanillic acid and syringic acid are obtained as preferred products.

The present application relates to a kind of for detecting colloidal semiconductor quantum dot spectroelectrochemical device and method.The device combines electrochemical workstation and spectroscopic detection system, for real-time monitoring the structural change of molecule and material in electrochemical reaction process.The core technology includes the accurate control of the redox state of sample, and obtains key molecular information by various spectroscopic analysis means (such as ultraviolet-visible absorption spectrum, infrared spectrum, raman spectrum etc.).Device design adopts modular structure, includes reference electrode, counter electrode and working electrode, to ensure the stability of reaction and the reliability of data.The method is suitable for the identification of electrocatalyst active site, the electronic structure regulation of material, the research of interface chemical reaction mechanism and the like.

The present invention provides an electrochemical cell electrode that appropriately possesses electronic conductivity, catalytic function, and ionic conductivity. [Solution] The electrochemical cell electrode 10 disclosed herein includes an electron conduction portion 12 mainly composed of an electron conduction catalyst and an ion conduction portion 14. A first layer 10a is formed in the region including the upper surface 10U of the electrochemical cell electrode 10. This first layer 10a includes the electron conduction portion 12 and substantially does not include the ion conduction portion 14. On the other hand, a second layer 10b is formed in the region including the lower surface 10D of the electrochemical cell electrode 10. In the width direction X of this second layer 10b, the electron conduction portion 12 and the ion conduction portion 14 are formed alternately. With this configuration, materials can be arranged according to the differences in required performance in the thickness direction, so that electron conductivity, catalytic function, and ion conductivity can be appropriately exhibited.

The invention discloses an anti-pollution and sterilization integrated non-co-reactant electrochemical luminescence (ECL) sensor for detecting staphylococcus aureus in an aquatic product as well as a preparation method and an application method of the anti-pollution and sterilization integrated non-co-reactant ECL sensor, and the anti-pollution and sterilization integrated non-co-reactant ECL sensor is suitable for ultra-sensitive detection of the staphylococcus aureus. The integrated hydrogel illuminant is characterized in that chitosan and citral are subjected to a Schiff base reaction to form a three-dimensional network in a cross-linking manner, and tetrakis (4-hydroxyphenyl) porphyrin (THPP) and luminol are introduced into the three-dimensional network. According to the present invention, THPP is adopted as a high efficiency oxygen evolution reaction (OER) electrocatalyst to generate reactive oxygen species (ROS) to replace the traditional hydrogen peroxide so as to be adopted as a co-reactant, such that the ECL signal of luminol is significantly enhanced; the hydrogel has excellent hydrophilicity and antibacterial activity, can significantly reduce non-specific adsorption, realizes anti-pollution detection, and realizes sterilization treatment after detection. By combining a DNA Walker signal amplification strategy, the sensor has a linear response to S. aureus within the range of 101-108 CFU / mL, the detection limit is as low as 0.39 CFU / mL, and the recovery rate of 97.3%-111.85% is obtained in a marine product actual sample. The device has the advantages of being simple in structure, sensitive in detection, high in anti-interference capacity, capable of achieving on-site rapid detection and the like, and is suitable for the fields of food safety, environment monitoring and clinical pathogenic bacterium detection.

The application discloses a nitrogen and boron doped carbon fiber catalyst and a preparation method and application thereof, and belongs to the field of oxygen reduction electrocatalyst preparation. Polyacrylonitrile (PAN) and boric acid are dissolved in an organic solvent to obtain a spinning slurry. The spinning slurry is used to prepare a fiber structure catalyst precursor by using an electrostatic spinning machine, and then the catalyst precursor is subjected to high-temperature crosslinking treatment in air and high-temperature carbonization treatment in a reducing gas to obtain nitrogen and boron doped carbon fiber which can be used as an electrocatalyst for catalyzing hydrogen peroxide production. The fiber network structure provides a high specific surface and good electrical conductivity, which is conducive to improving the electrochemical performance of the material. The nitrogen and boron doped carbon fiber catalyst prepared by the application has high hydrogen peroxide selectivity, and the process is simple and the conditions are mild.

The invention discloses a piezoelectric catalyst, a preparation method, application of the piezoelectric catalyst in sewage treatment and a professional application system.The Bi4Ti3O12 piezoelectric catalyst loaded with cation Ti vacancies is prepared through Bi (NO3) 3.5 H2O and Ti (OC4H9) 4 and applied to a special sewage treatment system, a light-pressure catalytic circulation system capable of operating cooperatively and independently is constructed, and the piezoelectric catalyst is applied to the sewage treatment system. And all-weather operation capability is realized. The optical unit and the piezoelectric unit of the special system are independent in structure, functional coupling is achieved through H2O2 directional transmission, and the carrier separation and migration process is optimized step by step. And the problems that the catalyst is difficult to recover and the hydrodynamic response is weak are solved. According to the invention, solar energy and water flow mechanical energy are utilized to realize high-efficiency low-carbon treatment from in-situ oxidant generation, instantaneous activation and deep mineralization, and a stable and economic solution is provided for treatment of refractory organic pollutants.

A photo-catalyst (EP) is regarded as an alternate method to replace the plasma chemical process and as an additional catalytic processing scheme on top of a micro- or nano-structured catalyst (EC) and electro-catalyst (EV). The potential energy reduction that results from the effect of photo-enhanced electro-catalyst (PEEC) is significant.

Electrocatalysts comprising transition metal oxide are disclosed. Uses the electrocatalyst as a working electrode are further disclosed. Electrochemical cells containing the working electrode and use thereof in the process of synthesizing ammonia is further disclosed.

This invention relates to the fields of solid waste resource utilization and new energy materials, and discloses an asymmetric single-atom electrocatalyst, its preparation method, and its application in zinc-air batteries. The preparation method includes: placing retired lithium iron phosphate powder in an acidic electrolyte, performing pulsed electrochemical leaching under continuous O2 introduction, and utilizing in-situ generated H2O2 to enhance the leaching process, achieving efficient recovery and precise separation of lithium and iron; subsequently, using filter residue rich in defective graphite and residual iron as a precursor, introducing a nitrogen source and PTFE, and then ball milling and high-temperature heat treatment to construct an iron single-atom catalyst with an Fe-N3F asymmetric coordination structure. This invention not only achieves "waste-to-waste" and green sustainable upgrading of retired batteries and microplastics, but also the prepared catalyst exhibits excellent power density and cycle stability in zinc-air batteries, demonstrating significant economic and environmental benefits.

A method of generating hydrogen gas including applying a potential of greater than 0 to 1.0 volts (V) to an electrochemical cell. The electrochemical cell is at least partially submerged in an aqueous solution. On applying the potential the aqueous solution is reduced thereby forming hydrogen gas. The electrochemical cell includes an electrocatalyst and a counter electrode. The electrocatalyst includes a substrate, strontium titanate (SrTiO3) nanoparticles, and cadmium selenide (CdSe) nanoparticles. The SrTiO3 nanoparticles have a substantially spherical shape. The CdSe nanoparticles have a polygon shape. The CdSe nanoparticles are distributed within a network of the SrTiO3 nanoparticles on the surface of the substrate.

This invention discloses a fullerene-based (Mo2C-WC) / C 60 An electrocatalyst, its preparation method, and its application are disclosed. The electrocatalyst is composed of molybdenum oxide, tungsten oxide, and fullerene. The molar ratio of molybdenum atoms to tungsten atoms is (0.5~2):1, and the ratio of the sum of the molar numbers of molybdenum and tungsten atoms to the molar number of carbon atoms in the fullerene is 1:20. The preparation method includes the following steps: mixing fullerene, molybdenum oxide, and tungsten oxide to prepare a mixed precursor; calcining the mixed precursor at high temperature under an argon atmosphere to obtain a (molybdenum carbide-tungsten carbide) / fullerene carbon material; acid washing the (molybdenum carbide-tungsten carbide) / fullerene carbon material to remove the metal elements generated in the reaction; and finally drying to obtain a fullerene-based (Mo2C-WC) / C material. 60 Electrocatalyst. The electrocatalyst of this invention forms a unique W-Mo heterojunction with a large specific surface area and electrochemical active area, which exposes more active sites, thereby greatly enhancing the catalyst's ability to electrocatalyze hydrogen evolution.

The invention discloses a method for performing electrochemical testing by preparing an electrocatalyst and applying the electrocatalyst to a zinc-air battery. The invention designs an oxygen electrocatalyst for oxygen reduction and oxygen evolution reaction based on a complex. Specifically, the oxygen electrocatalyst is prepared by taking two coordination polymers (CP) of CoNi and FeNi as precursors through a one-step pyrolysis method. The catalyst has excellent bifunctional oxygen electro-catalytic performance, and shows good stability and activity when applied to the zinc-air battery.

An electrochemical aptamer-based (E-AB) sensor is disclosed. The sensor is a closed bipolar electrode having a first end and a second end. The first end comprises an electrochromic material. The second end comprises an electrocatalyst and an oligonucleotide aptamer tethered to the second end. Further, the oligonucleotide aptamer is labelled with a redox indicator.

The present invention provides an electrode catalyst which has high catalytic activity while maintaining good durability, substance conductivity, and electrical conductivity, and which can be manufactured at a low cost.　The present invention provides an electrode catalyst which is composed of a void-containing body having voids, wherein: the void-containing body is provided with a core part and a skin layer that covers the core part; the core part is composed of a metal; the skin layer is composed of Ni and an oxide that contains a second metal; the second metal is a metal that is different from Ni; in addition, the skin layer is loaded with transition metal nanoparticles that are dispersed on the surface of the skin layer; and the particle diameter of the transition metal nanoparticles is smaller than the particle diameter of the metal and the particle diameter of the oxide.

The application belongs to the technical field of lithium-sulfur batteries, and provides application of a MoS2-Mo2C MXene composite material in preparation of a lithium-sulfur battery diaphragm, which comprises the following steps: heating and stirring etching of a Mo2Ga2C MAX material in hydrofluoric acid to obtain Mo2C MXene powder A; dissolving ammonium molybdate, glucose and thiourea in water to form a solution A, and adding the Mo2C MXene powder A; hydrothermal treatment of the precursor product, water washing until neutral, freeze-drying to obtain a precursor powder B; calcining the powder B to obtain a MoS2-Mo2C MXene composite material; and adjusting the composite material into a slurry to modify the surface of the diaphragm, so as to obtain a modified lithium-sulfur battery diaphragm. The application reduces polysulfide dissolution and shuttling, the MoS2-Mo2C MXene composite material acts as an electrocatalyst to promote the conversion of polysulfides in the battery charging and discharging process, accelerates the reaction kinetics, and improves the cycle stability and rate performance of the battery.

The invention relates to the technical field of solar synthesis ammonia, in particular to a photoelectric catalyst and a solar-driven process and system for preparing ammonia from air wastewater based on the catalyst, and a preparation method of the photoelectric catalyst comprises the following steps: S201, preparing a mineral carrier; s202, preparing a pretreatment carrier; s203, carrying out active point location loading; s204, carrying out antitoxic modification; and S205, forming the photoelectric catalyst: mixing the product prepared in the step S204 with the mineral carrier prepared in the step S201, adding a binder, grinding, coating a foamed nickel substrate with the mixture, and drying and roasting to obtain the photoelectric catalyst. The invention provides a photoelectric catalyst and a solar-driven process and system for preparing ammonia from air wastewater based on the photoelectric catalyst, and aims to solve the problems of high energy consumption and low solar energy utilization rate of an ammonia preparation process in related technologies, low selectivity of NO3 <-> reduced ammonia in ammonia preparation from wastewater, and easy poisoning of the catalyst by wastewater.

A membrane electrode assembly (6) for a fuel cell stack (2) is disclosed, comprising at least one electricity-generating sub-assembly (14) comprising an ion-conducting membrane (16) and two electrocatalyst layers (18, 20) arranged on both sides of the membrane as an anode (18) and a cathode (20) wherein the membrane electrode assembly further comprises at least one sub-gasket (26) surrounding the electricity-generating sub-assembly (14), wherein at least one sub-gasket (26, 28) has a first side (26-1; 28-1) opposite the first side and facing away from the power generating subassembly (14) and a second side (16-2; 28-2), in which at least one voltage monitoring interface element (10) is arranged at the membrane electrode assembly (6), which is adapted to contact the membrane electrode assembly (6) or a voltage providing component of the fuel cell stack, in which the voltage monitoring interface element (10) is arranged completely in the sub-gasket (26; 28) and supported by the voltage monitoring interface element (10), wherein the sub-gasket (26; 28) supporting the voltage monitoring interface element (10); 28), the respective side (26-1, 28-1; 26-2, 28-2) is at least partially exposed towards the external environment to provide the connection area (11).

The invention discloses a preparation method of a nickel-loaded nitrogen-doped lignin derived carbon-based catalyst for CO2 electroreduction. According to the method, lignin is adopted as a carbon source, melamine is adopted as a nitrogen source, a nickel-containing compound is adopted as a metal source, and the nickel-loaded and nitrogen-doped carbon-based catalyst is prepared through a simple loading and doping technological process. When the catalyst is applied to electrocatalytic CO2 reduction, it is found that the catalyst shows excellent catalytic activity on CO2 reduction, the existence form of metal Ni in the catalyst is changed by adjusting the Ni loading amount, and then the selectivity of CO in a CO2 electrocatalytic reduction product is changed. Compared with a traditional CO2 electrocatalyst, the lignin carbon source adopted in the method is a renewable solid waste resource, and the raw material cost is low; the technological process is simple and easy to operate; meanwhile, distribution of reduction products can be regulated and controlled by regulating and controlling preparation process parameters, and more application prospects are provided for electrocatalytic CO2 reduction.