13 results about "Platinum black" patented technology

The invention relates to the technical field of organic silicon catalysis, and discloses a hydrosilylation reaction catalyst and a preparation method thereof, the catalyst is prepared from a platinum complex catalyst solution, maleic anhydride, triphenyl borate, tetraethoxysilane, propylene carbonate and diethylene glycol dibutyl ether; the preparation method comprises the steps of solvent water removal, electronic relay adduct preassembly, active metal introduction, thermal induction aging and the like. An electron-deficient coordination center is constructed through a step-by-step process, the electron cloud density of the platinum center is reduced by utilizing the Lewis acid characteristic of triphenyl borate, and the solvent cage effect of propylene carbonate is matched, so that the high-temperature tolerance of the catalyst is improved, and the generation of platinum black is effectively inhibited; meanwhile, the solubilizing and bridging effects of diethylene glycol dibutyl ether are utilized, the compatibility problem of a high-polarity component and a non-polar silicone oil matrix is solved, and the obtained catalyst has high activity, high regioselectivity and excellent long-term storage stability.

The application belongs to the technical field of proton exchange membranes, and particularly relates to a preparation method of a multilayer gradient enhanced proton exchange membrane and a product thereof. The method comprises the following steps: cleaning and pretreating a base film; preparing a nitrogen / tungsten-based platinum black catalyst and preparing PFSA resin slurry containing the catalyst; coating the PFSA resin slurry on both sides of the e-PTFE film through a slit to obtain a proton conduction layer; irradiating a PEEK film with ultraviolet light and coating the PEEK film with TiO2 sol to form a mechanical enhancement layer; assembling the functional layers into a "sandwich" structure through PFSA resin adhesion; and performing low-temperature gradient drying and high-temperature annealing, and then performing off-line activation to obtain the multilayer gradient enhanced proton exchange membrane.

The present application relates to the technical field of water electrolysis for hydrogen production and discloses a hydrogen removal layer, a preparation method therefor, a hydrogen removal proton exchange membrane, a membrane electrode, and a water electrolysis hydrogen production apparatus. The hydrogen removal layer comprises the following components in parts by weight: 10-20 parts of a metal oxide, 10-20 parts of a catalyst, and 2-10 parts of an ionomer. The catalyst comprises at least one of a platinum black catalyst, an iridium black catalyst, and a palladium black catalyst. The hydrogen removal layer described in the present application can effectively reduce the hydrogen content in oxygen on the anode side of a proton exchange membrane.

The application discloses a method for selectively recovering platinum from waste nickel-platinum target material, and belongs to the technical field of precious metal separation. In the method, different physical forms of the waste nickel-platinum target material are treated by using appropriate pretreatment methods. For planing materials, an acidic dissolving agent is used to selectively dissolve nickel; for block or ingot materials, aqua regia is used to completely dissolve and then reduce and enrich platinum. The platinum-containing material obtained through pretreatment is dissolved by using aqua regia, the pH of the solution is adjusted to 0.2-0.9, a reducing agent is added to perform a reduction reaction, platinum is selectively precipitated as platinum black, and then sponge platinum with a purity of greater than or equal to 99.95% is obtained through calcination. The method realizes targeted treatment of different forms of waste materials, and through accurate pH adjustment and the synergistic effect of a specific reducing agent, efficient and selective reduction of platinum is realized, the residual platinum in the filtrate is less than 0.5 ppm, secondary recovery is not needed, the process is short, safety is high, the product purity is high, and the method is suitable for industrial production.

A wearable electrophysiological microneedle sensor, a manufacturing method, and an early identification method for plant stress. The microneedle sensor comprises a gel substrate and microneedle modules. Each microneedle module comprises a microneedle array, an adhesive layer, a conductive layer, and a silver wire, wherein the microneedle array is sequentially coated with the adhesive layer and the conductive layer, and the conductive layer is electrically connected to the silver wire. Each microneedle array comprises a microneedle base and microneedle bodies arranged on the microneedle base in an array, and platinum black is deposited on the conductive layer of each microneedle body. Electrophysiological signals of plants are collected by the microneedle sensor, the electrophysiological signals within a preset monitoring period are preprocessed, the preprocessed electrophysiological signals are input to a plant stress identification model, and a plant stress identification result is output. The microneedle sensor can stably and with high fidelity monitor changes in electrophysiological signals of plants caused by instantaneous and long-term stress of the plants, and can identify plant stress with high accuracy in combination with a machine learning model.

The present invention relates to an electrode, which is an in vivo insertable electrode, including a substrate, an electrically conductive layer formed on the substrate, a platinum black layer formed on the electrically conductive layer, a self-assembled monolayer (SAM) formed on the platinum black layer, and a lubricant layer formed on the SAM, a method of manufacturing the electrode, and a medical device including the electrode. The in vivo insertable electrode according to the present invention provides excellent electrical properties such as low impedance. Further, it shows that friction with tissue occurring when the electrode is inserted is reduced, and trauma during insertion and an immune rejection response after insertion is suppressed. Further, in the long term, it is possible to detect signals with high sensitivity throughout the entire period by preventing bioadhesion of in vivo cells, such as immune cells, and other proteins.

This invention provides a method for recovering Pt and Ir from waste water electrolysis membrane electrodes, comprising the following steps: Step S1. Dissolving and separating platinum and iridium: The waste water electrolysis membrane electrode is soaked in an organic solvent and separated to obtain a catalyst mixture residue. The catalyst mixture residue is added to a first reagent and calcined at high temperature to obtain precious metal residue. The precious metal residue is dissolved in hydrochloric acid and filtered to obtain a mixed residue. Then, the mixed residue is dissolved in a solvent and filtered to obtain chloroplatinic acid and iridium residue. The chloroplatinic acid is then reduced and purified to obtain platinum compound or platinum black. Step S2. Separating iridium: The iridium residue is added to a second reagent to oxidize and dissolve the iridium residue into chloroiridium acid and insoluble residue. The chloroiridium acid is oxidized with an oxidant, and then ammonium chloride is added and stirred to precipitate it to obtain ammonium chloroiridate. After purification, iridium compound or iridium black is prepared, and the insoluble residue is dissolved in aqua regia for reuse. This invention adds hydroxide to the precious metal residue during calcination, minimizing mechanical entrainment loss and preventing melt splashing during oxidative calcination.

The invention relates to a preparation method of a platinum black catalyst containing a small amount of carbon, and belongs to the technical field of electrochemical catalysts. The method comprises the following steps: dissolving a halogen-containing platinum precursor in a strong acid solution, adding silver ions for reaction, and removing precipitates to obtain a reaction solution; adding a boron-phosphorus co-doped carbon material into the reaction liquid; adjusting the pH of the reaction solution in the presence of a pH buffer agent to convert the platinum species into platinum hydroxide and / or platinum oxide; and then carrying out reduction treatment to obtain the platinum black catalyst containing a small amount of carbon. The functional groups and defect structures on the boron-phosphorus co-doped carbon surface are utilized to guide nucleation and growth of platinum species in the reduction process, and platinum black particles which are small in particle size and uniform in distribution are obtained. The obtained catalyst has relatively low density and remarkably improved dispersity and slurry stability while keeping high platinum loading capacity; compared with pure platinum black, the catalyst provided by the invention shows higher electrochemical activity surface area and enhanced electrochemical reduction activity.

The invention relates to the technical field of catalytic materials, and provides a preparation method of a particle size controllable platinum black catalyst for PEM water electrolysis hydrogen production. The preparation method comprises the following steps: mixing a platinum precursor, bromide, water and alcohol to obtain a precursor mixed solution; mixing the precursor mixed solution with an alkaline solution to obtain an alkaline mixed solution; and then carrying out reduction reaction on the alkaline mixed solution under a microwave condition to obtain the platinum black catalyst. According to the method provided by the invention, the particle size of the platinum black catalyst can be effectively controlled, the obtained platinum black catalyst is uniform in particle size, good in dispersity, high in activity, simple to operate and good in repeatability, and uniform batch preparation can be realized. Results of the embodiment show that the prepared platinum black catalyst is used as a PEM electrolytic cell membrane electrode cathode, a commercial iridium oxide catalyst is used as an anode, and the electrolytic voltage is only 1.78 V at 60 DEG C when the current density is 2A cm <-2 >, and is far lower than that of commercial platinum black and platinum carbon catalysts at present.

The invention discloses a platinum-doped proton exchange membrane, a preparation method thereof and a fuel cell, and belongs to the technical field of fuel cells. The platinum black with catalytic activity and the perfluorinated sulfonic acid resin are fully mixed, and the platinum-doped proton exchange membrane which is uniform in thickness, high in conductivity and resistant to free radicals is prepared in a spraying mode. When the platinum-doped proton exchange membrane is applied to a fuel cell, the proton exchange membrane is doped with platinum with catalytic activity, so that the platinum-doped proton exchange membrane can react with oxygen in cross transmission, and the oxygen is prevented from penetrating through the platinum-doped proton exchange membrane to react with an anode to generate free radicals with oxidation activity; therefore, the influence of free radicals on the structure of the platinum-doped proton exchange membrane is reduced, and the platinum-doped proton exchange membrane has the advantages of long service life, high stability and strong conductivity.

The invention provides a microelectrode modification method which can be applied to the technical field of neurotransmitter electrochemical detection and neural microelectrode modification. The method comprises the following steps: electroplating a platinum black nanoparticle film on the surface of a detection site; and electroplating a layer of organic composite film containing a conductive polymer and a carbon nanomaterial on the platinum black nanoparticle film to obtain the surface-modified microelectrode. The invention also provides a method for electrochemical detection of serotonin in the brain. According to the present invention, the specific modification parameters are adopted to achieve the double-layer structure modification structure of the electrode electrochemical site so as to enhance the electrochemical detection performance, and the square wave voltammetry detection method is adopted to improve the serotonin detection precision and the serotonin detection sensitivity, such that the method can be used for the real-time detection and the long-term monitoring of the internal body neurotransmitter of the experimental animal brain.

The application relates to the technical field of silicone catalysis, and discloses a hydrosilylation reaction catalyst and a preparation method thereof. The catalyst is made of a platinum complex catalyst solution, maleic anhydride, triphenyl borate, tetraethyl orthosilicate, propylene carbonate and diethylene glycol dibutyl ether; the preparation method involves the steps of solvent dewatering, pre-assembly of an electronic relay adduct, active metal introduction and heat-induced aging. The application constructs an electron-deficient coordination center through a step-by-step process, lowers the electron cloud density of a platinum center by using the Lewis acid property of triphenyl borate, improves the high-temperature resistance of the catalyst by matching the solvent cage effect of propylene carbonate, and effectively inhibits the generation of platinum black; meanwhile, the solubilization bridging effect of diethylene glycol dibutyl ether is used to solve the compatibility problem of high-polarity components and non-polar silicone oil matrix, and the obtained catalyst has high activity, high regioselectivity and excellent long-term storage stability.

An electrochemical microsensor comprising an array of working microelectrodes, the working microelectrodes include:one or more bare microelectrodes;one or more thick film-coated microelectrodes, optionally with conductive additive incorporated into the coating, selected from the group consisting of polysaccharide-coated microelectrodes and platinum black-coated microelectrodes;one or more thin film-coated microelectrodes selected from the group consisting of reduced graphene oxide-coated microelectrode and transition metal chalcogenide-coated microelectrodes;wherein the electrochemical microsensor further comprises a counter electrode and optionally one or more reference microelectrode(s).