23results about How to "Improve electrocatalytic performance" patented technology

The invention relates to the technical field of electrocatalysis, in particular to an oxygen / sulfur heterostructure oxygen evolution electrocatalyst and a preparation method and application thereof. Based on an in-situ oxidation strategy, a CuFeO layer is generated on the surface of CuFeS, and the CuFeS-coated CuFeO high-performance oxygen evolution electrocatalyst with a heterostructure is obtained. By constructing a sulfide-oxide heterojunction, a built-in electric field can be formed at an interface to promote charge separation and transfer, so that the electrocatalytic activity is remarkably improved. And on the other hand, the CuFeO layer on the outer layer serves as an armor, and the problem of oxidation of the surface of CuFeS is solved. The electro-catalytic performance and the long-term stability are obviously improved.

The invention belongs to the technical field of electro-catalysis, and particularly discloses a Cu nanoparticle / acidified carbon nanotube catalyst and a preparation method and application thereof.According to the preparation method, acidified pretreated carbon nanotubes with good conductivity and high specific surface area are selected as a substrate, CuO nanoparticles are evenly loaded through a hydrothermal method, and the Cu nanoparticle / acidified carbon nanotube catalyst is obtained; and growing a zeolite imidazate framework material-8 (ZIF-8) on the surface of the CuO nanoparticle-loaded carbon nanotube in situ, and regulating the thickness of an ultrathin nitrogen-carbon layer on the surface and coordination of Cu-N by regulating the calcining temperature and time. According to the Cu nanoparticle / acidified carbon nanotube catalyst as well as the preparation method and the application thereof, the Cu nanoparticles are encapsulated in a confined manner, so that long-service-life electrically-driven CO2 is converted into a high-added-value C2 + product, catalytic active sites of the Cu nanoparticles are fully exposed, the charge transfer rate is increased, and the intrinsic activity of the Cu active sites is improved.

This invention belongs to the field of electrochemiluminescence materials technology, and discloses a gold-silver nanocluster, its preparation method, and its application in the electrochemiluminescence-electrochemical dual-mode detection of chloramphenicol. The preparation method involves adding a silver source solution to a gold source solution, then adding an alkaline thiol β-cyclodextrin solution to obtain a mixed solution. Sodium bicarbonate is added to adjust the pH to 8.2-8.4, followed by incubation to obtain a crude product of gold-silver nanoclusters. The crude product is then purified by centrifugation and dialyzed to obtain the gold-silver nanoclusters. Furthermore, this invention uses these gold-silver nanoclusters as an ECL luminescent material to construct a sensor and applies it to the quantitative detection of chloramphenicol. This sensor innovatively achieves synergistic detection of ECL and DPV dual signals, with mutually verifiable detection results, exhibiting high sensitivity, excellent selectivity, good stability, and excellent repeatability.

This invention discloses the application of an electrode material for reducing intracellular resistance genes in drug-resistant bacteria. A platinum-doped dendritic TiO2 nanowire structure based on a three-dimensional material is formed by growing a micron-sized TiO2 backbone array and platinum-doped nano-sized TiO2 branches on the surface of a porous electrode. The prepared dendritic nanowire three-dimensional electrode material has a larger specific surface area, providing more reactive sites and strong electric field sites. Platinum doping enhances the conductivity and electrocatalytic performance of the nanowires. Furthermore, by combining it with chloride salts / oxidants, the electroporation and electrocatalysis of the nanowire electrode surface are coupled. The strong electric field confined at the nanowire tip induces perforation of the drug-resistant bacterial cell structure, strengthening the contact and reaction between the oxidant and the resistance gene. The high electrocatalytic activity confined at the nanowire tip induces the generation of strong oxidizing free radicals, achieving the goal of destroying the drug-resistant bacterial cell structure and efficiently reducing intracellular resistance genes.

This invention discloses a preparation process for titanium anodes used in electrolytic copper foil, relating to the field of anode plate manufacturing technology. In preparing the titanium anode for electrolytic copper foil, porous titanium is pretreated and then reacted sequentially with sodium hydroxide and chloroacetic acid to obtain nanowire titanium dioxide coated porous titanium; an iridium-tantalum pentoxide / titanium anode is prepared by mixing chloroiridium hexahydrate and tantalum ethoxide to form an iridium-tantalum pentoxide coating solution; polypyrrole is polymerized and coated onto graphene oxide to obtain polypyrrole-coated graphene oxide; a composite coating solution is prepared by reacting polypyrrole-coated graphene oxide, nickel chloride hexahydrate, and ferric chloride hexahydrate, followed by reduction with hydrazine hydrate; this composite coating solution is then coated onto the iridium-tantalum pentoxide / titanium anode to obtain the titanium anode for electrolytic copper foil. The titanium anode for electrolytic copper foil prepared by this invention exhibits excellent electrocatalytic performance and service life.

The invention provides a platinum-bismuth alloy catalyst, a preparation method thereof and a direct methanol fuel cell, and belongs to the technical field of electrochemical catalysts. The method comprises the following steps: mixing carbon black with an acidic aqueous solution, and sequentially carrying out acidizing treatment and roasting treatment to obtain pretreated carbon black; mixing the pretreated carbon black, Bi2O2CO3, a platinum source, a precipitant, a pH regulator, a first dispersing agent and first water, and performing replacement reaction to obtain a suspension; mixing a reducing agent, a second dispersing agent and second water to obtain a mixed solution; dropwise adding the suspension into the mixed solution for reduction reaction to obtain a catalyst precursor; and calcining the catalyst precursor under first protective gas to obtain the platinum-bismuth alloy catalyst. The prepared platinum-bismuth alloy catalyst has excellent electro-catalytic performance, shows relatively high catalytic activity and cycling stability, and can be applied to oxygen reduction reaction of a cathode of a direct methanol fuel cell.

The invention discloses an iridium alloy nanowire catalyst as well as a preparation method and application thereof. The iridium alloy nanowire catalyst comprises an active component and a carrier, the active component is a metal alloy Ir-M; the carrier is a conductive carrier; m is selected from one or more of manganese, iron, cobalt, nickel, copper and zinc; wherein the morphological structure of the metal alloy Ir-M is a wormlike multilayer nanowire. According to the iridium alloy nanowire catalyst provided by the invention, the dosage of noble metal Ir can be reduced, the cost of the catalyst is reduced, and the electrochemical performance and corrosion resistance of the catalyst are also improved.

The invention relates to the technical field of electrochemical reduction of carbon dioxide, and particularly discloses a preparation method of formic acid, which comprises the following steps: performing electrochemical reduction on a material containing carbon dioxide; wherein a cathode electrode used when the electrochemical reduction is carried out comprises a titanium-doped bismuth-based material, and the titanium-doped bismuth-based material has a nanorod shape; the titanium-doped bismuth-based material with the nanorod morphology is used as the electrocatalyst, the hydrogen evolution reaction in the electrochemical reduction reaction is inhibited, the formic acid selectivity is remarkably improved, the long-term stability is achieved in an electrolytic tank, and particularly, carbon dioxide can be efficiently reduced into pure formic acid in a solid electrolytic tank.

The invention provides an electrochemical sensor constructed based on an NP-G-AuPd NFs composite material. The electrochemical sensor comprises a working electrode and a sensing material modified on the working electrode, the sensing material is a nitrogen and phosphorus co-doped graphene-AuPd nanoflower composite material. Therefore, when the AuPd NFs and the NP-G are mixed, the AuPd NFs and the NP-G can be embedded in the middle of the graphene, the graphene is stripped to present a single-layer yarn-shaped structure, the conductivity of the graphene can be enhanced, the larger specific surface area of the graphene is a good interface for loading the AuPd NFs, and the NP-G and the nano material are mixed to finally prepare the NP-G-AuPd NFs composite material with better conductivity. An electrochemical sensor based on the NP-G-AuPd NFs composite material is constructed to detect diclofenac sodium, and a DPV test result shows that the composite material has good electro-catalytic performance and can be used for determining an actual sample.

This invention discloses a method for preparing a cross-shaped nanostructured PtCu alloy catalyst and its application, belonging to the field of electrocatalysis and fuel cell technology. The method involves sequentially adding an aqueous solution of chloroplatinic acid and a copper chloride solution to a reaction vessel, followed by the addition of a reducing agent and a dispersant. The mixture is then fully dissolved by ultrasound and stirring, and after homogenization, heated under an inert atmosphere. After the reaction, the catalyst is centrifuged, washed, and freeze-dried to obtain a PtCu alloy catalyst with a cross-shaped nanostructure. This invention uses an aqueous phase system, avoiding the use of macromolecular organic solvents, thus fundamentally solving the problems of the synthesized product being easily encapsulated by organic matter and the active sites being difficult to expose in traditional methods. Furthermore, the nanostructured catalyst obtained through aqueous phase synthesis has a clean surface, allowing for full exposure of the catalytic active centers and effective contact with the reactants, thereby significantly improving the electrocatalytic performance of the catalyst.

The invention belongs to the technical field of solid oxide fuel cells, and discloses a solid oxide fuel cell half cell and a preparation method thereof. The problem of bending deformation of SOFC cells produced in the prior art is solved. Comprising the steps that (1) an anode supporting layer green body, an anode functional layer green body and an electrolyte layer green body are prepared respectively, a solvent F1 system is adopted for preparing the anode supporting layer green body, a solvent F2 system is adopted for preparing the anode functional layer green body, a solvent F3 system is adopted for preparing the electrolyte layer green body, and F1, F2 and F3 are solvent systems with different compositions or proportions; (2) stacking, forming layers and sintering; f1, F2 and F3 respectively and independently comprise at least one of ethanol, propanol, isopropanol, butanol, butanone, terpilenol, butyl acetate, toluene and xylene, and the three components or ratios are different. The bending degree of the half battery piece can be effectively reduced, and the production yield is improved.

The application belongs to the technical field of electrocatalysis, and particularly relates to an electrocatalytic material and a preparation method thereof. Existing catalytic materials are unstable in the process of electrocatalytic hydrogen evolution. The application provides an electrocatalytic material, which is prepared from 2H-MoS2 and alkali metal carbonate through high-temperature calcination. Through a method of facilitating phase transition of 2H-MoS2 by means of molten alkali metal carbonate assisted intercalation, a ternary 1T'-MMoS2 (A=Na, K) material is prepared. The 1T'-MMoS2 is a stable ternary compound, so that the product avoids reverse transition from the 1T' phase to the 2H phase in the process of electrocatalytic hydrogen evolution, thereby exhibiting excellent stability.

This invention discloses the preparation of a lanthanum-bismuth co-doped cobalt tetroxide catalyst and its application in the electrocatalytic oxidation of ethylene glycol. Using a controllable hydrothermal-annealing two-step method and nickel foam as a conductive substrate, this invention prepares a lanthanum-bismuth co-doped cobalt tetroxide catalyst with a stable structure for the efficient catalytic oxidation of ethylene glycol. This catalyst exhibits a typical nanoflower-like structure composed of nanowires, which helps enhance mass transport and the utilization of active sites, thereby improving overall electrocatalytic performance. Specifically, the introduction of heteroelemental elements results in the lanthanum-bismuth co-doped cobalt tetroxide catalyst prepared in this invention exhibiting better catalytic performance for the oxidation of ethylene glycol compared to unsupported nickel foam.

The application discloses a high-performance oxygen evolution reaction composite electrocatalyst and a preparation method thereof, and belongs to the field of electrocatalytic material preparation. The application solves the problem that it is difficult to realize uniform loading and precise size control of RuO2 nanoparticles on a three-dimensional porous complex substrate (foamed nickel), thereby affecting the performance and repeatability of the prepared electrocatalyst. The method comprises the following steps: sulfidizing the foamed nickel with thiourea first, and then uniformly depositing RuO2 nanoparticles on the surface of the foamed nickel-based Ni3S2 by using an ALD technology. The application precisely controls the size of the RuO2 nanoparticles on the surface of the foamed nickel-based Ni3S2 to be 1.5-3.5 nm, and the surface density to be 0.8-1.2´10 12 / cm 2 , so that the conductivity and electrochemical activity of the catalyst can be improved, the charge transfer rate can be improved, and the OER performance of the electrocatalyst is improved.

The present application relates to a kind of Anderson type polyacid modified Co-MOF nanoflower electrocatalyst preparation and application.The purpose of the present application is to solve the problems of poor electrocatalytic ability, easy dissolution and poor conductivity of metal-organic framework as base material caused by polyacid enrichment in existing polyacid-based materials, to improve the electrocatalytic efficiency of ammonia production materials. A kind of Anderson type nickel molybdenum polyacid (referred to as NiMo6) modified cobalt-based metal-organic framework (referred to as Co-MOF) nanoflower electrocatalyst (referred to as Co-MOF / NiMo6) is designed and developed in this patent. Based on the strong acidity of polyacid, it plays an etching role. The composite material has a nanoflower structure. This Anderson type polyacid modified Co-MOF nanoflower electrocatalyst not only has a high specific surface area of layered structure and rich active sites, but also solves the problem of easy dissolution of polyacid in water. The Co-MOF / NiMo6 composite electrocatalytic material obtained by the present application is used for normal temperature and pressure electrocatalytic reduction of nitrate to produce ammonia.

This invention relates to a vacancy-controlled manganese selenide-molybdenum selenide-sulfurite heterojunction catalyst, its preparation method, and its applications. The invention first prepares nanoparticle-sized MnSe, then reacts the MnSe with sodium molybdate, Se powder, and other raw materials via a hydrothermal reaction to obtain the manganese selenide-molybdenum selenide-sulfurite heterojunction catalyst. Further, Mn vacancies are introduced according to different performance requirements. Vacancy-introducing agents include ethylenediaminetetraacetic acid, citric acid, iminodiacetic acid, aminotriacetic acid, sodium ethylenediaminetetramethylene phosphate, and hexametaphosphate, ultimately yielding the vacancy-controlled manganese selenide-molybdenum selenide-sulfurite heterojunction catalyst. The vacancy-controlled manganese selenide-molybdenum selenide-sulfurite heterojunction catalyst exhibits significantly enhanced photoelectrochemical and electrocatalytic performance; its photocurrent density is 5.2 times that of single-electrochemical MoSSe, and the electrocatalytic hydrogen evolution overpotential is reduced to 197 mV compared to MoSSe's 476 mV. The method of this invention is simple, easy to control, and has high production efficiency.

The invention relates to the technical field of catalysts, in particular to a cobalt-based phosphide nano catalytic material as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving a cobalt salt, urea and ammonium fluoride in water to obtain a mixed solution, placing a pretreated carbon cloth in the mixed solution, carrying out a hydrothermal reaction, taking out the carbon cloth to obtain a carbon cloth-loaded phosphating precursor, and carrying out hydrothermal reaction on the carbon cloth-loaded phosphating precursor in a protective atmosphere to obtain the carbon cloth-loaded phosphating precursor. Carrying out phosphating treatment with a phosphorus source; and carrying out constant piezoelectric deposition by taking the carbon cloth loaded cobalt phosphide as a working electrode and cobalt salt as an electrolyte to obtain the cobalt-based phosphide nano catalytic material. The cobalt-based phosphide nano catalytic material shows excellent catalytic activity, rapid reaction kinetics and good stability in HER, OER and full water splitting application, the preparation method is simple and controllable, the cobalt-based phosphide nano catalytic material is expected to replace a noble metal-based catalyst, and the cobalt-based phosphide nano catalytic material has a wide application prospect in the field of electro-catalysis energy conversion.

The application discloses an electrochemical detection method of 3-amino-2-oxazolidinone (AOZ), and relates to the technical field of electrochemical detection, and comprises the following steps: (1) preparation of conjugated microporous polymer (CMP); (2) preparation of gold nanoparticles (AuNPs); (3) preparation of CMP / AuNPs / SPCE; (4) electrochemical detection of AOZ; and (5) characterization of CMP / AuNPs / SPCE. The electrochemical detection method of 3-amino-2-oxazolidinone is characterized in that gold nanoparticles with a large specific surface area and excellent conductivity and conjugated microporous polymer are drop-coated on the surface of a screen-printed carbon electrode (SPCE) to prepare an electrochemical modified electrode CMP / AuNPs / SPCE for measuring AOZ, and a differential pulse voltammetry method is used to establish an electrochemical detection method for measuring AOZ based on the modified electrode. The method is convenient for batch preparation and low in cost, only needs 30 muL of sample, and can be used for on-site rapid detection of AOZ, a furazolidone metabolite, in animal-derived food.

The application provides a kind of sulfur-doped keggin type molybdenum polyacid and nickel sulfide heterojunction composite catalyst and its preparation method and application.The heterojunction composite catalyst is composed of keggin type molybdenum polyacid doped with sulfur and nickel sulfide;The heterostructure of the heterojunction composite catalyst is formed by MoS2 and NiS.The application uses keggin type molybdenum polyacid ([HPMo9O 34 ] 8‑ )As a polyoxometalate framework, modify the nickel source, and simultaneously sulfidize, realize the synthesis of sulfur-doped keggin type molybdenum polyacid and nickel sulfide heterojunction composite catalyst, the heterojunction composite catalyst has excellent electrocatalytic performance and excellent electrochemical stability, in oxygen evolution reaction, it shows lower overpotential, lower tafel slope and excellent long-term running stability, provides a practical strategy for developing high-performance, low-cost, corrosion-resistant OER materials.

This invention discloses an electrolytic water anode mesh, its preparation method, and an electrolysis apparatus, relating to the field of hydrogen production through water electrolysis. A collision-embedding method is used to deposit electrolytic nickel powder onto the surface of a preheated nickel mesh. By controlling the deposition conditions, a large-area, stable catalytic working layer with a micro / nano structure can be prepared, enhancing the electrolytic catalytic performance of the electrolysis. Compared to plasma spraying for Raney nickel deposition, the method provided by this invention eliminates the need for subsequent alkaline activation, significantly improving preparation efficiency and reducing equipment, maintenance, and manufacturing costs. Furthermore, it avoids the environmental pollution caused by alkaline aluminum removal activators. Compared to plasma spraying for Raney nickel deposition, the micro / nano dual-scale structure working layer prepared by this invention offers controllable micron and nanoscale dimensions and a three-dimensional structure, further enhancing the electrode's electrolytic catalytic performance and demonstrating excellent application prospects.

The invention provides a self-assembled composite biological membrane anode material, a microbial fuel cell and a preparation method of the microbial fuel cell, and relates to the technical field of fuel cells. According to the high-performance microbial fuel cell provided by the invention, a commercial carbon material loaded cyclodextrin modified iron-based or manganese-based / molybdenum-based oxide is used as an anode substrate material, and nano-material powder of graphene oxide and metal oxide is further added into anode liquid containing microorganisms, so that the high-performance microbial fuel cell is prepared. Electrons generated by microbial metabolism can drive graphene oxide to be reduced on an anode, and at the same time, the electrons and added metal oxide powder are self-assembled to form a multistage electron transfer hybrid biological membrane which has excellent electro-catalytic performance and good conductivity and cooperatively promotes indirect / direct extracellular electron transfer and intercellular electron transfer. The output power density of the microbial fuel cell can be greatly improved, and the application prospect is good.

The invention relates to the technical field of catalysts, and discloses a hydrogen fuel cell electrode catalyst and a preparation method and application thereof. The hydrogen fuel cell electrode catalyst comprises a composite carrier and Pt particles loaded on the composite carrier, the composite carrier comprises graphene, a ZrO2 layer coated on the graphene, and a surface oxide combined on the surface of the ZrO2 layer; and the surface oxide is SiO2 and / or TiO2. When the catalyst is used in a hydrogen fuel cell electrode, high electro-catalysis efficiency can be achieved, good electrochemical stability is achieved, and high electro-catalysis efficiency can be kept in a corrosive environment (such as phosphoric acid electrolyte).

The application discloses a nickel-cobalt-nitrogen co-doped carbon / carbon fiber composite electrocatalyst with a parallel array structure and a preparation method thereof, and belongs to the technical field of energy materials. The method comprises the following steps: firstly, preparing Ni-Co-ZIF crystals with uniform particle sizes; then, adding polyvinylpyrrolidone spinning solution; and finally, preparing the nickel-cobalt-nitrogen co-doped carbon / carbon fiber composite electrocatalyst with a parallel array structure through micro-flow spinning and high-temperature carbonization. The composite catalyst is a micron-level fiber membrane, which is composed of a carbon fiber substrate with a porous structure on the surface and nickel-cobalt-nitrogen co-doped carbon, wherein the nickel-cobalt-nitrogen co-doped carbon is uniformly embedded on the carbon fiber. The material has high electrocatalytic activity for oxygen evolution reaction in an alkaline medium, and the performance is superior to that of commercial RuO2.