74 results about "Standard hydrogen electrode" patented technology

A composition suitable for tantalum chemical-mechanical polishing (CMP) comprises an abrasive, an organic oxidizer, and a liquid carrier therefor. The organic oxidizer has a standard redox potential (E⁰) of not more than about 0.5 V relative to a standard hydrogen electrode. The oxidized form comprises at least one pi-conjugated ring, which includes at least one heteroatom directly attached to the ring. The heteroatom can be a N, O, S or a combination thereof. In a method embodiment, a CMP composition comprising an abrasive, and organic oxidizer having an E⁰ of not more than about 0.7 V relative to a standard hydrogen electrode, and a liquid carrier therefor, is utilized to polish a tantalum-containing surface of a substrate, by abrading the surface of the substrate with the composition, preferably with the aid of a polishing pad.

PCT No. PCT/US96/12540 Sec. 371 Date Feb. 17, 1998 Sec. 102(e) Date Feb. 17, 1998 PCT Filed Aug. 7, 1996 PCT Pub. No. WO97/07163 PCT Pub. Date Feb. 27, 1997Epoxy resins, particularly those based on bisphenol A, can constitute the principal film forming polymer component of a storage stable autodepositable composition wherein the particle size distribution of all the film forming polymers in the composition satisfies certain criteria of size distribution, and an accelerator component which is an acid, oxidizing agent or complexing agent is present in amount sufficient to provide an oxidation-reduction potential at least 100 mV more oxidizing than a standard hydrogen electrode. Such dispersions can conveniently be prepared using a two stage process in which a solution of the film forming polymers is emulsified into water to form a preliminary dispersion and this preliminary dispersion is subjected to at least one particle size refinement stage in which the preliminary dispersion is forced through a narrow aperture.

A medium for isolating or releasing an electrostatically charged component from or into an aqueous composition. The medium has a polyelectrolyte film on at least one surface of an article wherein the polyelectrolyte film is characterized by an interpenetrating network of a predominantly positively charged polymer and a predominantly negatively charged polymer. The predominantly positively charged polymer, the predominantly negatively charged polymer or both contain (i) a pH sensitive imidazole repeat unit having a pKa between 3 and 9, or (ii) a redox sensitive repeat unit selected from the group consisting of quaternized bipyridine repeat units, coordinated metal repeat units, pyrrole repeat units, aniline repeat units, thiophene repeat units and combinations thereof having a redox potential between +1.2 volts and −1.2 volts versus a standard hydrogen electrode.

An electro-optic display has a viewing surface through which a user views the display, a bistable, non-electrochromic electro-optic medium, and at least one electrode arranged to apply an electric field to the electro-optic medium, the display. The display comprises at least 10 micromoles per square meter of the viewing surface of at least one redox compound having an oxidation potential more negative that about 150 mV with respect to a standard hydrogen electrode, as measured at pH 8.

The invention provides a composition for chemical-mechanical polishing, The composition comprises an abrasive, a first metal rate polishing modifier agent, a second metal rate polishing modifier agent, and a liquid carrier. In one embodiment, the first metal rate polishing modifier agent has a standard reduction potential less than 0.34 V relative to a standard hydrogen electrode, and the second metal rate polishing modifier agent has a standard reduction potential greater than 0.34 V relative to a standard hydrogen electrode. In other embodiments, the first and second metal rate polishing modifier agents are different oxidizing agents.

In a semiconductor device including an organic layer containing a light-emitting substance between a first electrode connected to a source or drain electrode layer of an enhancement-type transistor that has a channel formation region using an oxide semiconductor and a second electrode overlapped with the first electrode, an active, electrically conductive material which produces a hydrogen ion or a hydrogen molecule by reducing an impurity including a hydrogen atom (e.g., moisture) is excluded from the second electrode. The semiconductor device including an oxide semiconductor is formed using especially an inert, electrically conductive material which hardly causes production a hydrogen ion or a hydrogen molecule by reacting with water. Specifically, the semiconductor device is formed using any of a metal, an alloy of metals, and a metal oxide each having a higher oxidation-reduction potential than the standard hydrogen electrode.

An improvement in the corrosion resistance of a magnetoresistive head is aimed for, and a high magnetoresistivity ratio is maintained. In a magnetoresistive head equipped with, as a magnetic sensor element for detecting magnetic signals while in contact with a magnetic recording medium, a spin-valve film, which has a structure where an anti-ferromagnetic layer, a pinned layer in which the direction of magnetization is pinned in a predetermined direction by an exchange-coupling magnetic field at work between itself and the anti-ferromagnetic layer, a free layer in which the direction of magnetization changes in accordance with an external magnetic field, and a non-magnetic layer for magnetically isolating the pinned layer and the free layer are layered, the corrosion potential of the spin-valve film relative to a standard hydrogen electrode measured while immersed in a NaCl solution of a concentration of 0.1 mol/L is specified at +0.4 [V vs. SHE] or above.

The invention relates to an electrochemistry measuring water chemical oxygen demand method; a working electrode, a counter electrode and a reference electrode are provided in a sodium sulfate electrolyte solution or a sodium nitrate electrolyte solution; constant potential is maintained; the chemistry oxygen demand value of a water sample is measured by measuring the response current generated by an oxidation organic substance. The invention is characterized in that the working electrode adopts microcrystal boron adulterated with diamond or nano-crystal boron adulterated with diamond; the PH value of the electrolyte solution is 1-7; the voltage exerted in the electrolyte solution is 2.24-2.28 V if the reference electrode is a standard hydrogen electrode. The invention has the advantages of environmental friendly, high accurate COD determination, wide measuring range, easy operation and small time consumption; the invention can be used to rapid test of COD in the samples of municipal sewage and industrial sewage.

The invention provides a preparation method of vanadium doping molybdenum disulfide nanoflower with defects and electrocatalysis application thereof. Firstly, a molybdenum and sulfur pre-reaction solution is prepared, and the reaction solution is heated to synthesize defective molybdenum disulfide nano-powder; then hydrothermal reaction is carried out on the defective molybdenum disulfide nano-powder and vanadium source compound to synthesize vanadium doping molybdenum disulfide spherical nano-powder; under the protection of inert gases, annealing treatment is carried out to obtain vanadium doping molybdenum disulfide nanoflower-shaped nano-powder. Vanadium doping molybdenum disulfide with defects is applied to electrocatalysis hydrogen generation reaction (HER), the catalytic performanceis excellent, the overpotential is as low as -0.160V (relative standard hydrogen electrode), and the Tafel slope is as low as 46mV/dec.

The invention discloses an electrolyzing synthesizing method of polypyrrole, which comprises the following steps: dissolving pyrrole monomer in the Bronsted acid typed ionic liquid; placing in the electrolyser with working electrode, auxiliary electrode and reference electrode; selecting working electrode from stainless steel electrode or platinum electrode or nickel electrode or glass-carbon electrode; selecting the auxiliary electrode from platinum electrode or graphite electrode with large area; selecting reference electrode from Ag/AgCl electrode or saturated calomel electrode or large area of platinum electrode or standard hydrogen electrode.

The invention provides preparation and electrocatalytic application of inverse-spinel type cobalt ferrite nano-powder with oxygen vacancy. The preparation method comprises the following steps: firstly, preparing an alkaline cobalt iron aqueous solution and carrying out heating reaction to obtain cobalt ferrite nano-powder; secondly, introducing the oxygen vacancy into the obtained cobalt ferrite by using a normal temperature reduction method; finally, obtaining the cobalt ferrite nano-powder with the oxygen vacancy. The cobalt ferrite nano-powder with the oxygen vacancy has excellent catalyticproperties when being applied to electrocatalytic oxygen-producing reaction (OER), the overpotential drops to 0.330V (relative standard hydrogen electrode) and the Tafel slope is as low as 44 mV/dec.

The invention provides an iron and nitrogen-doped carbon nanosphere preparation method and application of the nanosphere in oxygen reduction. The dopamine hydrochloride is used for synthesizing a nitrogen source supply object polydopamine under alkaline condition, and then the surface of ferriferrous oxide nanosphere is coated by the polydopamine; the ferriferrous oxide nanosphere coated by the polydopamine is subjected to a reaction with glucose in a high pressure reaction vessel, and under nitrogen condition, high temperature calcining is carried out to obtain the iron and nitrogen-doped carbon nanosphere. The synthesis of the iron and nitrogen-doped carbon nanosphere takes glucose as a raw material, and the ferriferrous oxide nanosphere coated by the polydopamine is taken as a corrosiontemplate and the nitrogen source. The nitrogen-doped carbon nanosphere used in a electrocatalysis oxygen reduction reaction (ORR) has good effect and good endurance, an initial potential relative standard hydrogen electrode of reduction oxygen is 0.949 V, the efficiency after endurance test can still reach more than 85%, after addition of methanol, the usage efficiency can still reach 94%, and the nitrogen-doped carbon nanosphere has good anti-methanol effect.

The invention provides a preparation method of a curved surface electrode catalyst layer, which is characterized by comprising the following steps of: 1, preprocessing an electrode matrix; 2, carrying out electrochemical deposition on a catalyst: inserting the preprocessed electrode matrix into an electrochemical deposition pool, loading an electroplating bath containing catalyst cations in the electrochemical deposition pool, forming a three-electrode system with a reference electrode and a counter electrode with the electrode matrix as a working electrode, controlling the potential of the working electrode to be -0.7-0.5V relative to a standard hydrogen electrode for carrying out electrochemical deposition until the loading capacity of the catalyst on the electrode matrix reaches a preset loading capacity, then taking the electrode matrix out, rinsing with deionized water for drying in air for later use; 3, dipping in a perfluorinated sulfonic acid resin solution; 4, repeating the step 2 and the step 3 until the loading capacity of the catalyst on the electrode matrix reaches the set loading capacity of the catalyst, entering the step 5; and 5, activating an electrode.

In the prior art, ammonia (NH3) as the important raw material industry, agriculture and pharmacy plays an important role in human life and development, and the huge industrial ammonia production process and the release of a large amount of carbon dioxide greatly increase the greenhouse effect, such that the production of ammonia through electrocatalytic nitrogen reduction under mild conditions isthe research focus worldwide. Based on the problem in the prior art, the present invention provides a preparation method and electrocatalytic nitrogen reduction applications of vanadium-doped ferroussulfide nanometer powder, wherein the preparation method comprises: adding an iron source reagent and a vanadium source reagent to a special solvent to prepare a pre-reaction liquid, heating the pre-reaction liquid to obtain iron-vanadium precursor nanometer powder, and carrying out a vulcanization reaction on the iron-vanadium precursor nanometer powder to finally obtain the vanadium-doped ferrous sulfide nanometer powder. According to the present invention, the vanadium-doped ferrous sulfide nanometer powder has excellent activity in the field of production of ammonia through electrocatalytic nitrogen reduction (NRR), the yield of ammonia at -0.1 V (relative standard hydrogen electrode) is up to 106.3 [mu]g h<-1>mg<-1>cat, and the Faraday efficiency achieves 9.5%.

The method of manufacturing a cathode for a fuel cell in accordance with the present invention is a method of manufacturing a cathode for a fuel cell equipped with a catalyst layer containing a catalyst, and includes a potential providing step of providing a precursor layer containing the catalyst with a potential higher than 1.3 V with reference to a standard hydrogen electrode, so as to form the catalyst layer.

A preparation method of a carbon, silver-copper and polyaniline composite electro-catalyst for oxygen reduction reaction of a fuel cell includes using ethanol as solution and a reducing agent; simultaneously depositing silver nanoparticles and copper nanoparticles on carbon particles by a hydrothermal method to form a carbon-supported silver-copper bimetal nanometer catalyst; and then decorating the particle surface of the catalyst by polyaniline by a chemical method to obtain the carbon, silver-copper and polyaniline composite electro-catalyst. Anhydrous ethanol and Nafion solution are added into the carbon, silver-copper and polyaniline composite electro-catalyst to prepare a corresponding carbon, silver-copper and polyaniline composite electro-catalyst electrode. The carbon, silver-copper and polyaniline composite electro-catalyst is high in electro-catalytic activity in oxygen reduction reaction, oxygen reduction reaction initial potential is 0.160V [vs SHE (versus a standard hydrogen electrode)], and current density is 1.50mAcm<-2> at -0.15V (vs SHE). In addition, the preparation method is simple, the structure of the electro-catalyst is stable, usage of silver which is precious metal is greatly reduced, and the electro-catalyst is widely applied to fuel cells.

The invention provides preparation and application of a monatomic platinum catalyst based on MXene quantum dots. MXene quantum dots are used as a carrier, and a certain amount of chloroplatinic acid and molten salt are added to obtain a mixed solution; the mixed solution is stirred, frozen and dried, high-temperature calcination on the obtained solid powder under the protection of an inert atmosphere is carried out, and acid pickling, washing and drying are then carried out to obtain the novel monatomic platinum catalyst taking the MXene quantum dots as the carrier. The catalyst has very highcatalytic activity on electrocatalytic nitrogen reduction reaction, the ammonia yield under -0.2 V (relative to a standard hydrogen electrode) reaches up to 80.3 mug h<-1> mg<-1> cat., the Faraday efficiency reaches 7.3%, and the catalyst is a potential electrocatalytic nitrogen reduction catalyst material.

The present invention provides a method for the removal of substantially all the amount of Mn contained in cobalt containing solution thereby to obtain purified cobalt solution with Mn content of 10 ppm or less and specifically a method for removing Mn from cobalt sulfate solution comprising the steps of adjusting pH of the solution within the range of 3-6 and then adding the NaOCl to the solution to obtain an oxidation-reduction potential in the range of 1100 to 1300 mV, with respect to standard hydrogen electrode (SHE); and removing Mn precipitate from thus treated solution.

The invention provides a preparation method and an electrocatalytic nitrogen reduction application of an ultrathin nanosheet vanadium-doped nickel sulfide nanopowder. The preparation method comprisesthe following steps: a vanadium source and a nickel source are added to a reaction solution to prepare a pre-reaction solution, the pre-reaction solution is heated and reacted for a certain period oftime, and then is cooled, and the obtained reaction product is washed, centrifuged, vacuum-dried and collected to obtain a vanadium-nickel precursor nanopowder; the vanadium-nickel precursor nanopowder is subjected to a vulcanization reaction through a solvothermal process to obtain a vanadium-doped nickel sulfide intermediate nanopowder; and the vanadium-doped nickel sulfide intermediate nanopowder is placed in a tubular furnace, and is annealed under the protection of an inert gas to obtain the ultrathin nanosheet vanadium-doped nickel sulfide nanopowder. The ultrathin vanadium-doped nickelsulfide has an excellent catalytic property in the field of electrocatalytic nitrogen reduction (NRR), the ammonia yield at -0.2 V (relative to a standard hydrogen electrode) is as high as 63.2 [mu]gh<-1> mg <-1> cat, and the Faraday's efficiency reaches 8.3%.

The invention provides a preparation method and electrocatalytic applicationof a phosphorus with defects doped aCoFe2O4 nanometer powder. First, a cobalt - iron prereaction solution is prepared by adding a certain proportion of cobalt and iron sources in a reaction solution, and the CoFe2O4 nanometer powder is collected after heating the prereaction solution for a certain time;and then, the CoFe2O4 nanometer powder is processed for a period of time under the action of a reducing agent to obtain the CoFe2O4 nanometer powder with vacancy defects,secondly, phosphating treatment of the CoFe2O4 nanometer powder with the vacancy defects is carried out,phosphorus atoms are introduced and finally the phosphorus with defects doped a CoFe2O4 nanometer powder is obtained. Specifically, the phosphoruswith the defects doped theCoFe2O4 nanometer powdershows excellent catalytic activity in electrocatalytic oxygen production reaction (OER), an overpotential is 0.287 V (relative to a standard hydrogenelectrode), a tafel slope is down to 56 mV/dec,and charge transfer resistance is reduced to 47ohm.

The invention provides a preparation method of nano spherical sulfur-doped iron oxide nano-powder and application of the nano spherical sulfur-doped iron oxide nano-powder in electrocatalytic nitrogenreduction. The method comprises the following steps: firstly, adding a sulfur source and an iron source into a high-temperature and high-pressure reaction kettle to prepare pre-reaction liquid; heating the pre-reaction liquid to react for a certain time; cooling, washing, drying in vacuum, and collecting to obtain the nano spherical sulfur-doped iron oxide nano powder. The sulfur-doped iron oxideshows excellent catalytic activity in the field of electrocatalytic nitrogen reduction (NRR), the ammonia yield under -0.2 V (relative to a standard hydrogen electrode) is as high as 30.6 [mu]g.h <-1>.mg<cat.><-1>, and meanwhile, the Faraday efficiency reaches 1.3%.