241 results about "Iridium oxide" patented technology

In a process of fabricating a stent composed primarily of niobium alloyed with a trace amount of zirconium, tantalum, or titanium for hardening, the stent is annealed under vacuum in a substantially oxygen-free environment. The vacuum is preferably maintained at pressure less than 10⁻⁴ millibars, oxygen-content less than about 80 parts per million, and the annealing temperature exceeds 400° C. for at least one hour, and is preferably kept in a range from about 1100–1200° C. for several hours. This may be followed by applying a surface layer of oxide, such as iridium oxide, with a thickness of 299–300 nm to the stent.

An iridium oxide (IrOx) nanowire protein sensor and associated fabrication method are presented. The method provides a substrate and forms overlying working and counter electrodes. A dielectric layer is deposited over the working and counter electrodes and contact holes are formed in the dielectric layer, exposing regions of the working and counter electrodes. IrOx nanowires (where 0≦X≦2) are grown from exposed regions of the working electrode. In one aspect, the IrOx nanowires are additionally grown on the dielectric, and subsequently etched from the dielectric. In another aspect, IrOx nanowires are grown from exposed regions of the counter electrode.

The invention is directed to precious metal oxide catalysts, particularly to iridium oxide based catalysts for use as anode catalysts in PEM water electrolysis and other applications. The composite catalyst materials comprise iridium oxide (IrO₂) and optionally ruthenium oxide (RuO₂) in combination with an inorganic oxide (for example TiO₂, Al₂O₃, ZrO₂ and mixtures thereof). The inorganic oxide has a BET surface area in the range of 30 to 200 m²/g and is present in a quantity of 25 to 70 wt.-% based on the total weight of the catalyst. The catalyst materials are characterised by a good electrical conductivity >0.01 S/cm and high current density. The catalysts are used in electrodes, catalyst-coated membranes and membrane-electrode-assemblies for PEM electrolyzers, PEM fuel cells, regenerative fuel cells (RFC), sensors and other electrochemical devices.

The invention discloses a fuel cell anti-reversal catalyst and a preparation method thereof, wherein the catalyst comprises an iridium oxide composite niobium doped titanium dioxide nano catalyst, andniobium doped titanium dioxide is a carrier. According to the technical scheme, the catalyst capable of effectively relieving carbon carrier corrosion and platinum particle agglomeration growth during fuel cell anode side reversal generation can be obtained, so that the fuel cell anti-reversal time is prolonged.

The invention discloses silica doped modified insoluble iridium oxide anode and preparation method thereof, wherein the silica doped modified insoluble iridium oxide anode comprises a titanium base body and a layer of iridium oxide active coating doped with silica nano constituent coated on the surface of the titanium base body. The preparation method is simple. The grain of the SiO2 doped modified insoluble iridium oxide anode coatings is fine and the coatings is in porosity characteristic. The oxygen evolution electrocatalysis of anode is high and the service life of the anode is longer. The SiO2 is used for replacing the large amount of noble metal oxide, thus the preparation and use cost of the anode is greatly reduced.

The invention discloses a titanium mesh anode for an electrodeposited nickel, which consists of a titanium coated copper conducting bar, a titanium plate support welded below the titanium coated copper conducting bar, and two titanium meshes welded onto the two sides of the titanium plate support, wherein the surfaces of both the titanium meshes are covered with metallic oxide coatings; the metallic oxide coating consists of platinum group metallic oxide and valve metallic oxide; the molar ratio of the platinum group metal and the valve metal is 1 to 2:1 to 3; 10 to 50g platinum group metal is contained in the titanium mesh per square meter; the platinum group metallic oxide is iridium oxide and/or ruthenium dioxide; and the valve metallic oxide is or several of titanium dioxide, tantalum pentoxide and zirconium dioxide. The invention also provides a preparing method for the titanium mesh anode. Compared with the conventional lead-base alloy anode, the titanium mesh anode has light weight, low oxygen evolution potential and long service life, can prevent the titanium meshes from being dissolved, and can improve the quality of the cathode products.

The invention discloses a making method of a platinum iridium oxide alloy electrode. The method includes the following steps: heating and stirring a platinum salt and sodium nitrate mixed solution to 55-65DEG C, carrying out evaporating crystallization, drying, grinding, calcining to obtain a mixture, washing the mixture by water to remove impurities, carrying out full wet grinding, and dispersing the wet ground mixture in a solvent to obtain a platinum dioxide solution; dispersing an iridium salt in the solvent, adding the platinum dioxide solution, adjusting the pH value to 14 by using sodium hydroxide, and dissolving and dispersing to obtain a coating solution; and coating a titanium plate with the coating solution, drying, calcining at 400-700DEG C, and cooling in air to obtain the platinum iridium oxide alloy electrode. The above platinum iridium oxide titanium anode electrocatalysis material prepared in the invention has the characteristics of fine crystsal grains and honeycomb shape; and the anodic chlorine evolution electrocatalytic activity is high, and the service life is long, so the electrode is suitable for preparing electrolyzed oxidizing water, and the use cost is reduced.

The invention provides electro-catalyst compositions for an anode electrode of an acid mediated proton exchange membrane-based water electrolysis system. The compositions include a noble metal component selected from the group consisting of iridium oxide, ruthenium oxide, rhenium oxide and mixtures thereof, and a non-noble metal component selected from the group consisting of tantalum oxide, tin oxide, niobium oxide, titanium oxide, tungsten oxide, molybdenum oxide, yttrium oxide, scandium oxide, cooper oxide, zirconium oxide, nickel oxide and mixtures thereof. Further, the non-noble metal component can include a dopant. The dopant can be at least one element selected from Groups III, V, VI and VII of the Periodic Table. The compositions can be prepared using any solution based methods involving a surfactant approach or a sol gel approach. Further, the compositions are prepared using noble metal and non-noble metal precursors. Furthermore, a thin film containing the compositions can be deposited onto a substrate to form the anode electrode.

The invention discloses a hydrated-structured SnO2 (stannic oxide)/IrO2 (iridium oxide) xH2O oxide film electrode material, which comprises a substrate and a SnO2/IrO2 xH2O oxide film, wherein the SnO2/IrO2 xH2O oxide film is deposited on the surface of the substrate and is of a hydrated structure, the molar ratio of Sn (stannum) to Ir (iridium) of the oxide film is 30-70:70-30, and the x ranges from 0.2 to 3. The hydrated-structured SnO2/IrO2 xH2O oxide film electrode material can be used for preparing high-quality electrochemical capacitors. Additionally, the film electrode material is simple in preparation process, practical and suitable for industrial production and application.

The invention discloses a composite coating electrode and a preparing method thereof and an electrolytic cell. The composite coating electrode comprises a conductive matrix and an electro-catalysis coating. The electro-catalysis coating is composed of ruthenium oxide, iridium oxide, tantalum pentoxide and titanium oxide. The electrolytic cell comprises an electrolyte, an anode, a cathode and a power source. The anode is coated with the electro-catalysis coating composed of the ruthenium oxide, the iridium oxide, the tantalum pentoxide and the titanium oxide. The preparing method of the composite coating electrode comprises the following steps that the pretreated electrode is coated with three kinds of coating liquid in sequence, and heat treatment is carried out every time coating is conducted. The composite coating electrode is long in service life, the voltage of the electrolytic cell is effectively reduced and the current efficiency is effectively improved through the electro-catalysis coating used in the composite coating electrode, and the oxygen content of generated hydrogen which is an electrolysis side product is low; meanwhile, the hydrogen can be recycled, and good application prospects are achieved.

The invention relates to an iridium oxide electrode and the method for preparing the same, belonging to the field of electrochemical technique. Said electrode is especially suitable for nerve electrographic recording and nerve electric stimulation and pH sensor. There is one insulating layer in the iridium oxide electrode, at least one electrode core is packed inside; at least one end of said electrode core is on the electric conductor, the outer surface of metallic iridium or non-iridium is deposited, and the electric conductor surface is regenerative iridium oxide. One end is connected with wire and the iridium oxide surface is out of insulating layer. The process of electrochemical activation to generate iridium oxide surface comprises following steps: a. pre-treating electrode; b. putting electrode into activating solution for treatment; c. depolarizing activation electrode through reference electrode and auxiliary electrode. The iridium oxide electrode is characterized by safety, reliability, high sensitivity, practical, wide application, fast, controllable and high efficient production method.

An anode catalyst suitable for use in an electrolyzer. The anode catalyst includes a support and a plurality of catalyst particles disposed on the support. The support may include a plurality of metal oxide or doped metal oxide particles. The catalyst particles, which may be iridium, iridium oxide, ruthenium, ruthenium oxide, platinum, and/or platinum black particles, may be arranged to form one or more aggregations of catalyst particles on the support. Each of the aggregations of catalyst particles may include at least 10 particles, wherein each of the at least 10 particles is in physical contact with at least one other particle. The support particles and their associated catalyst particles may be dispersed in a binder.

The invention provides a titanium anode plate with a precious metal combination coating. The titanium anode plate is provided with titanium base materials. The surface of the titanium base materials is orderly coated with a ruthenium oxide coating, a mixing coating of molybdenum oxide, tantalum oxide and titanium oxide, and a mixing coating of iridium oxide and palladium oxide. The titanium anode plate provided by the invention solves the anode corrosion problem in a mixing system of chloride and sulfate, prolongs the service life of a titanium anode, and is suitable for producing metal materials, such as nickel, cobalt, copper, and the like through hydrometallurgy electrolysis.

A conductive oxide solid formed through an electrochemical process. The resulting solid predominantly contains oxides of the highest oxidation state. Additionally, the solid can be thick, uniform, stable across a wide range of acidity and temperature, fully hydrated, and conductive with a very low redox potential. A preferred embodiment is an iridium solid formed at high temperature in molten carbonate, said solid containing intercalated lithium. The solid has application as an electrode with reduced drift. An electrochemical acidity sensor is disclosed which pairs an electrode bearing the solid with a reference electrode. Additionally, sensor apparatuses for measuring carbon dioxide and other materials as well as methods for measuring materials using an embedded acidity sensor are disclosed.

The invention relates to an iridium oxide (IrOx) electrode prepared through a cyclic thermo oxidation method. The IrOx electrode comprises an insulation layer, wherein an electrode core is packaged in the insulation layer; and one end of the electrode core is a conductor having an IrOx surface film prepared through cyclic thermo oxidation, the other end of the electrode core is formed by a lead, and a part of the IrOx electrode core is uncovered in the open air for pH induction when the IrOx electrode core is packaged into the insulation layer. A high temperature heating and quenching technology in the cyclic thermo oxidation method is repeated at least twice in order to generate the IrOx film with strong surface adhesion and strong mechanical strength; and then the IrOx electrode is immersed in distilled water for hydration, so the sensitivity of the electrode is close to a Nernst response. The IrOx-pH electrode provided in the invention has the advantages of small volume, high sensitivity, good stability, convenient making, wide application fields and the like.