1259results about How to "Improve electrocatalytic activity" patented technology

Electrocatalyst powders and methods for producing electrocatalyst powders, such as carbon composite electrocatalyst powders. The powders have a well-controlled microstructure and morphology. The method includes forming the particles from an aerosol of precursors by heating the aerosol to a relatively low temperature, such as not greater than about 400° C.

The invention discloses an electrolyzed-water catalytic material with a nanometer core-shell structure of cobalt sulfide and molybdenum disulfide. The electrolyzed-water catalytic material is composed of a catalytic active material and a carrier, wherein the catalytic active material is a material with the nanometer core-shell structure of cobalt sulfide and molybdenum disulfide; molybdenum disulfide is a shell; cobalt sulfide is a core; and the carrier is ultrafine carbon fiber. The electrolyzed-water catalytic material provided by the invention has high specific surface area and porosity, is favorable for diffusion and gas desorption of electrolyte, has the characteristics of dual functions of hydrogen evolution and oxygen evolution at the same time, and can be directly used as an electrode for electrocatalytic hydrogen preparation without the need of loading onto the electrode.

The synthesis of Pt and PtRu and other Pt based nano-particles that catalyze the electrochemical oxidation of methanol, carbon monoxide and hydrogen, as well as oxygen reduction, is described. The Pt based catalysts are synthesized in solution forming particles of 0.8 to 10 nm size (forming a “colloidal” solution) and are subsequently applied to a desired substrate as e.g., carbon black, graphite, metals. The application of the nano-sized catalyst particles on the substrates involves electroless deposition at open-circuit, such as immersing the substrate into the colloidal solution or spraying the catalyst particles on the substrate. The Pt, PtRu and other Pt based catalyst can also be directly deposited on the substrate involving the simultaneous reduction and deposition of the Pt based catalysts onto the substrate surface and into its porous structure. The presently described synthesis and deposition of the resulting Pt based nano-particles on and into a variety of high surface area and preferably electronically conductive substrates results in electrodes of high surface areas, relates directly to the preparation and use of high surface area electrodes, (anodes and cathodes) which could be used in e.g., direct methanol, hydrogen and hydrogen containing carbon monoxide fuel cells.

The invention discloses a nano loaded titanium-based electric catalytic film comprising a conductive microporous separating titanium film matrix and a catalytic coating. Furthermore, the invention also discloses a preparation method of the nano loaded titanium-based electric catalytic film, which comprises the following steps of: (1) preprocessing the titanium film matrix by sand blasting, alkali washing, and acid etching: soaking the matrix after sand blasting in an NaOH solution for 0.5 to 2h, then processing for 1 to 2h in an oxalic acid solution with the mass percent concentration of 10 percent after washing to a neutral state, washing with water and drying at 100 to 120 DEG C; and (2) preparing and loading a catalytic coating: preparing the catalytic coating by adopting a sol-gel method, a thermal decomposition method, an electrodeposition method or a chemical vapor deposition method and loading at the surface of the titanium film matrix and in a hole. Furthermore, the invention also discloses a film reactor comprising the nano loaded titanium-based electric catalytic film. According to the nano loaded titanium-based electric catalytic film, the defects on material strength, range limitation of working voltage, catalytic oxidation efficacy and the like in the prior art are solved.

The invention discloses a preparation method of a layered ferronickel hydroxide electrode. The preparation method comprises the following steps: preparing a solution containing a ferric salt, a nickel salt and urea, wherein the concentration of the ferric salt is 1-100mmol/L, the concentration of the nickel salt is 1-100mmol/L and the concentration of the urea is 2-200mmol/L; and placing a substrate into the solution containing the ferric salt, the nickel salt and the urea, then placing the substrate in a hydrothermal reactor at the temperature of 60-180 DEG C, keeping the temperature for 1-20h, then washing and drying the substrate, and carrying out plasma treatment or high temperature calcination treatment in a protective atmosphere finally to obtain the layered ferronickel hydroxide electrode. The preparation method, is lower in reaction temperature, short in reaction time, simple in preparation process, strong in controllability and good in repeatability, improves the production efficiency, lowers the production cost, is green and environmental friendly and can effectively solve the problem of environmental pollution without participation of an organic solvent and a toxic chemical reagent in the reaction process.

The invention discloses a preparation method of a nitrogen-doped graphene loaded platinum nano-particle catalyst. The preparation method comprises the following steps of: firstly, preparing graphene oxide (GO); secondly, preparing polyaniline/graphene oxide (PANI/GO) through a liquid-liquid interface polymerization method; thirdly, drying the PANI/GO, transferring the dried PANI/GO into a tubular furnace, and performing high-temperature treatment for 2 hours at 800 DEG C to prepare NGs (nitrogen-doped graphenes); and finally, ultrasonically dispersing the NGs into an aqueous solution, uniformly mixing the NGs with chloroplatinic acid according to a certain mass ratio, slowly adding sodium borohydride (NaBH4) into the mixed solution, and performing magnetic stirring for 8 hours to prepare the NGs loaded platinum nano-particle catalyst (Pt/NGs) which takes the NGs as a catalyst carrier to uniformly load platinum nano-particles to the surfaces of the NGs without any chemical modification. The nitrogen atoms which are doped into molecular structures of GNs not only provide a large amount of active sites for PtNPs loading, but also enhance the interaction between the PtNPs and an NGs carrier and improve the catalytic stability and catalytic activity of a nano composite material.

The invention discloses an oxygen reduction and oxygen evolution Co2P@NPC double-function compound catalyst and a preparation method and application thereof. The compound catalyst comprises N-P-codoped carbon layer coated Co2P nano rods and/or nano particles. The preparation method includes: evaporating and drying the solution of cobalt acetate, concentrated phosphoric acid and urea, and performing high-temperature treatment under protective atmosphere to obtain the compound catalyst. The preparation method has the advantages that the method is simple, low in cost and beneficial to industrial production; the prepared oxygen reduction and oxygen evolution Co2P@NPC double-function compound catalyst is applicable to fuel cell and water decomposition, high in activity and good in stability, the catalytic performance of the compound catalyst is close to that of a commercial precious metal 20wt% Pt/C and RuO2 catalyst, and the compound catalyst is promising in application prospect.

The invention provides a synthesis method of a palladium nano sheet, and relates to a palladium nano material. The method comprises the following steps: adding a palladium precursor, a surface protectant, and halogen ion-containing organic salt or halogen ion-containing inorganic salt to a solvent to obtain mixed liquor; placing the mixed liquor under a carbon monoxide atmosphere, and heating to 10-200 DEG C; and then cooling to room temperature, adding acetone, carrying out centrifugal purification, and cleaning to obtain the palladium nano sheet. The synthesized palladium nano sheet has the advantages of high yield greater than 80%, uniform particle diameter with the deviation smaller than 10%, ultrathin structure with the thickness about 1.8nm, larger specific area, high atom utilization ratio and favorable electro-catalytic activity. The size of the obtained palladium nano sheet can be well adjusted. The palladium nano sheet has good near-infrared spectrum absorption feature, has prodigious potential application in the biological thermal therapy, such as the application in the near-infrared thermal therapy for tumors; and the palladium nano sheet has favorable electro-catalytic performance.

The invention belongs to the field of metal material and relates to a method for surface treatment of a titanium electrode substrate. The service life and the electrocatalysis performance of the titanium electrode are greatly increased by the abrasive blasting pretreatment to the substrate. The abrasive blasting treatment is carried out on the titanium substrate; the nozzle pressure of an abrasive blasting machine is 0.3-0.5MPa; the Al2O3 grinding medium of 70-90 meshes is adopted; the blasting angle is 45-90 degrees; the distance from the nozzle to a workpiece is 1-2cm; the coarsening time is 15-30s; the titanium substrate is then pickled for pickling treatment in a 10wt.% of oxalic acid solution for 1.5-2.5 hours at the temperature of 90-95 DEG C; a Ti/IrO2.Ta2O5 oxide coating electrode is prepared on the obtained substrate by a thermal decomposition method, wherein the Ir is chloro-iridic acid, Ta is tantalum pentachloride and the molar ratio of Ir to Ta is 7:3; a coating solution is uniformly coated on the pre-treated titanium substrate by a soft hair brush; the titanium substrate is dried for 10min at the temperature of 120 DEG C, is subsequently arranged in a box-type resistance furnace and sintered for 10min at the temperature of 450 DEG C; the above operations of coating, drying and sintering are repeatedly carried out by 5-20 times; and the final sintering is carried out for 1h at the temperature of 450 DEG C. The method provides optimum pretreatment parameters, greatly prolongs the service life of the titanium electrode, effectively improves the electrocatalytic activity and greatly reduces the running and repairing cost for the electrode.

A method for the manufacture of an oxygen reduction reaction (ORR) catalyst, the method comprising; providing a metal organic framework (MOF) material having a specific internal pore volume of 0.7 cm³g⁻¹ or greater; providing a source of iron and/or cobalt; pyrolysing the MOF material together with the source of iron and/or cobalt to form the catalyst, wherein the MOF material comprises nitrogen and/or the MOF material is pyrolysed together with a source of nitrogen and the source of iron and/or cobalt is disclosed.

The invention relates to the field of battery manufacturing and energy storage, in particular to a preparation method of a bismuth-base catalyst/carbon nanofiber combination electrode for an all-vanadium redox flow battery. Firstly, spinning solution required for an experiment is prepared and then bismuth salt and the spinning solution are uniformly mixed. According to an electrostatic spinning method, a required nanofiber film is prepared and then the nanofiber film is pre-oxidized in the air and is carbonized in an inert atmosphere tube furnace so as to obtain the required bismuth-base electrocatalyst/carbon nanofiber combination electrode. After the obtained electrode material is cleaned and dried, testing of related electrochemical performance representation and charge-discharge properties can be carried out on the electrode material. The carbon fiber diameter, which is prepared according to the preparation method, is in the nano class; compared with a specific surface area of a conventionally used electrode material, the specific surface area of the bismuth-base catalyst/carbon nanofiber combination electrode is greatly increased. Moreover, the carbon nanofibers are compounded with a high-activity bismuth-base electrocatalyst, and thus, electrochemical activity of the electrode can be greatly improved, so that energy efficiency of the all-vanadium redox flow battery is greatly improved.

The invention discloses a Fe-Co-P-C amorphous electro-catalyst for an efficient hydrogen evolution reaction and a preparation method thereof. The Fe-Co-P-C amorphous electro-catalyst for the efficient hydrogen evolution reaction is characterized in that the electro-catalyst is a Fe-Co-P-C amorphous alloy strip, components of the electro-catalyst are Fe(80-x)CoxP(20-y)Cy, 0<=x<=50, 0<=y<=15, and x and y are correspondingly the atomic percent of Co and the atomic percent of C in the Fe-Co-P-C amorphous alloy strip. The Fe-Co-P-C amorphous electro-catalyst is prepared by adopting a melt rotary quenching method, the preparation method is simple, easy to operate, low in cost and friendly to environment, the whole preparation process does not need special equipment, large-scale industrial production can be achieved, and the quality of the obtained alloy strip is high; and according to the prepared Fe-Co-P-C strip through the preparation method, the advantages of being good in conductivity, large in number of active sites, high in electro-catalytic performance and the like are achieved simultaneously, and the Fe-Co-P-C amorphous electro-catalyst is a hydrogen evolution electro-catalytic material which has the wide industrial application prospect.

The invention relates to a method for preparing a graphene biosensor, belonging to the technical field of electrochemistry. The method comprises the following steps of: immersing a processed gold electrode into graphene oxide and a sodium sulphate solution, electrically depositing the electrode through a control electric potential, taking out the electrode, washing the electrode by using water, after drying the electrode at room temperature, putting the electrode in a chloroauric acid solution, electrically depositing the electrode through the control electric potential, taking out the electrode, washing the electrode by using water, and drying the electrode at room temperature; putting a modified electrode in a conductive polymer monomer and a supporting electrolyte solution, polymerizing the electrode through the control electric potential by adopting a cyclic voltammetry, taking out the electrode, washing the electrode by using water, and drying the electrode at room temperature; and activating the modified electrode in an EDC/NHS (Dichloroethane/N-Hydroxysuccinimide) solution, and immersing the modified electrode in a vomiting toxin antibody. The method disclosed by the invention is used for fixing graphene, gold nanoparticles and conducting polymers through electro-deposition; therefore, the method is very green and environment-friendly; furthermore, the thickness of a coating and sizes and distribution densities of the gold nanoparticles can be precisely controlled, thus, the batch production repeatability of the modified electrode is good.

The invention provides a preparation method of a transition metal phosphide/core-shell nitrogen-doped carbon nanofiber composite material. The preparation method includes preparing a carbon nanofiberaccording to an electrospinning technique by taking a carbon-containing high-molecular polymer as a carbon source, coating the carbon nanofiber with an electroconductive polymer through surface polymerization, loading an MOF material onto the surface of the carbon nanofiber coated with the electroconductive polymer according to an in-situ growth method to obtain a precursor, and subjecting the precursor to high-temperature carbonizing and phosphating to obtain the transition metal phosphide/core-shell nitrogen-doped carbon nanofiber composite material. Activity test results show that the transition metal phosphide/core-shell nitrogen-doped carbon nanofiber composite material prepared by the preparation method has high electrocatalytic activity for total decomposition reaction of HER, OER and water and has high stability in acid-base media, thereby being a dual-functional catalyst that can replace precious metal and having a good development prospect in water electrolysis reaction.

An electrocatalytic porous titanium filter membrane with a micro nano structure and a preparation method thereof are disclosed, the electrocatalytic porous titanium filter membrane comprises a porous titanium film matrix, a TiO2 middle layer with the micro nano structure and an electrocatalytic active layer loaded on the TiO2 middle layer, the TiO2 middle layer with the micro nano structure is TiO2 nano flower, nanowire, nanorod or nanotube aggregates growing in situ on the porous titanium film matrix, and the electrocatalytic active layer is PbO2, SnO2, RuO2, IrO2, Sb2O5, Bi2O3 and other transition metal oxides or a composite comprising the various metal oxides. The method comprises three main steps: pretreatment of the porous titanium matrix, construction of the middle layer with the micro nano structure and loading of the active layer. The electrocatalytic porous titanium filter membrane has excellent mass transfer performance, high electrocatalytic activity, high pollutant removal efficiency, low energy consumption, and the like, thus having a good application prospect in the field of organic wastewater treatment.