40 results about "Rotating disk electrode" patented technology

The invention discloses an oil-water alternating wetting corrosion simulation device and method; the device includes an electrochemical signal processing system, an oil-water alternating wetting simulation electrolytic cell, a rotating disk electrode system, an oil-water interface control system, an aeration system and a temperature control system which is used for heating the oil-water alternating wetting simulation electrolysis cell. The device provided by the invention can realize rapid response of a carbon steel corrosion signal in an oil-water alternating wetting environment, seizes main characteristics of the oil-water two-phase flow environment, and can reveal a corrosion law more comprehensively and deeply.

Methods and systems for simultaneously measuring concentration of two or more different cations in solution. The methods include the steps of applying a steady state polarization technique to a solution comprising two or more different cations; measuring the limiting currents of the solution; and correlating the limiting currents with the concentration of the different cations. The system includes a working electrode; a potentiostat; a counter electrode; a reference electrode; a solution comprising different cations to be analyzed; and a model for correlating the limiting currents with the concentration of the pair cations. The working electrode may be any electrode compatible with the media, including noble metals, carbon, or combinations thereof. In some embodiments, the working electrode is a rotating disk electrode (RDE).

The corrosion inhibiting activity of a coating is determined from the effect of corrosion inhibiting species released by the coating on the oxygen reduction current for a cathode placed very close to the coating. A rotating disk electrode or pumped solution flow is used to sweep the corrosion inhibiting species from the coating surface to the cathode. The oxygen reduction current is measured under conditions of oxygen diffusion control.

The invention provides a method for preparing an oxygen reduction catalyst from cobalt sulfide. The method comprises the following steps: (1) dissolving 52.4 mg of cobalt nitrate hexahydrate (with a molar mass of 0.2 mmol) and 48.4 mg of 4,4'-bpdc (with a molar mass of 0.2 mmol) in 23 mL of DMF and dissolving 31.5mg of 1,3-bib (with a molar mass of 0.15 mmol) in 2mL of DMF, respectively; (2) afterrespective ultrasonic treatment of solution samples obtained in step (1) for 1 minute, mixing the obtained solutions, transferring the obtained mixture to a reactor with a volume of 50 cm<3>, carrying out heating to 120 DEG C at a heating rate of 1.2 DEG C / min, keeping the mixture at 120 DEG C for 48 hours, then carrying out slow cooling to room temperature at a rate of 0.4 DEG C / min, after cooling to room temperature, separating purple crystals by decanting mother liquor, carrying out washing with DMF, and carrying out drying after cleaning so as to obtain a cobalt-based metal organic framework; (3) weighing a part of a sample prepared in the step (2) and thioacetamide, putting the weighed sample and thioacetamide into ceramic vessels respectively transferring the weighed sample and thioacetamide to the outlet end and the inlet end of a tube furnace, and carrying out pyrolysis in a nitrogen atmosphere at a heating rate of 5 DEG C / min to obtain black powder; and (4) testing the ORR performance of the produced black powder by using an electrochemical workstation and a rotating disk electrode.

The invention discloses an oil-water alternating wetting corrosion simulation device and method; the device includes an electrochemical signal processing system, an oil-water alternating wetting simulation electrolytic cell, a rotating disk electrode system, an oil-water interface control system, an aeration system and a temperature control system which is used for heating the oil-water alternating wetting simulation electrolysis cell. The device provided by the invention can realize rapid response of a carbon steel corrosion signal in an oil-water alternating wetting environment, seizes main characteristics of the oil-water two-phase flow environment, and can reveal a corrosion law more comprehensively and deeply.

An auxiliary leveler additive that cannot be analyzed by conventional CVS methods for acid copper plating baths is analyzed by cyclic voltammetry at a platinum rotating disk electrode from its effect on the anodic current at very positive potentials.

The invention discloses a rolling bearing defect detecting device based on oil spectrum analysis and magnetic flux leakage testing. The rolling bearing defect detecting device consists of a rolling bearing to be detected, a Hall element, a permanent magnet, a magnet yoke, a magnetism gathering device, an oil injection cavity, a rotating base, a collecting tank, a piezoelectric oil atomizer, an oilinjection port, an oil inlet, a telescopic support, an adjustable bayonet, a first valve, a filter cavity, a latex tube, a second valve, a detection cavity, a rotary table electrode, a graphite rod electrode, an optical fiber, an entrance slit, an optical grating, an exit slit, a spectrograph, a computer work station, a third valve and a recycle cavity. The technology of atomic emission spectroscopy is combined with the technology of magnetic flux leakage testing, and the disadvantage that abrasive particles of greater than 10 microns cannot be detected in the technology of atomic emission spectroscopy is solved; the device is of multifunctionality, the work environments of rolling bearings can be simulated, and the detection for different dimensions of rolling bearings is realized; the influence of irrelevant impurities on measurement cannot be eliminated, and recycling treatment is carried out on oil after detection. Repeated rapid and accurate measurement is realized, and the device is of innovativeness and practical value.

The invention relates to detection on heavy metal ions, and particularly relates to a sensor based on an asymmetric polymer film as well as a detection method and applications thereof. An ionometer is respectively connected with a reference electrode and a working electrode by virtue of leads, a working electrode and the reference electrode are inserted in a to-be-detected sample pool, the working electrode is composed of an ion selective electrode and a rotating disk electrode inserted in the ion selective electrode, the ion selective electrode is a polyvinyl chloride tube, and an asymmetric polymer film is adhered to the bottom of the polyvinyl chloride tube; and the asymmetric polymer film is composed of a polymer film substrate and a lipophilic ion exchange bed. According to the invention, an asymmetric polymer film ion selective electrode is adopted, so that the sensitivity of heavy metal ion detection is remarkably improved, and the detection limit is reduced; and through combining with a rotating disk electrode technology, the detection time is shortened.

The invention discloses a special oil analysis device based on gathered optical fiber signal transmission and double-layer multi-CCD (Charge Coupled Device) detection, and the special oil analysis device is used for detecting the content of various metal elements in an oil sample. A rotating disc electrode drives oil to an analytical gap, spark discharge is generated by high voltage between two electrodes, and the metal elements in the oil sample are excited to generate emission spectra; and light with different wavelengths is transmitted to a grating to be split through optical fibers and then irradiated to different CCDs, and the content of multiple elements is obtained through light intensity signal detection and digital operation of spectral lines. The special oil analysis device comprises a light source part, an optical fiber transmission system, a light splitting system, a photoelectric detection system and a control circuit, wherein the light source part comprises a high-voltage generator, a rod electrode and the rotating disc electrode; and the light splitting system fixedly arranges an incidence gap, a concave grating and the CCDs on a Rowland circle device by virtue of a Paschen-Runge device. Compared with an existing instrument, the special oil analysis device disclosed by the invention has the characteristics of fast analysis, simultaneous detection on more than ten elements, direct sampling, no sample pretreatment, easiness for operation and convenience for maintenance.

The invention relates to a MoS2 nanosphere difuncitonal oxygen catalyst of a hierarchy structure a preparation method thereof and application thereof in electrocatalyzing oxygen in an alkaline medium. The MoS2 nanosphere difuncitonal oxygen catalyst is MoS2 nanospheres which are synthesized by taking Na2MoO4 and KSCN as raw materials and adopting a hydrothermal method and have the hierarchy structure, and the MoS2 nanospheres are formed by a plurality of MoS2 nanosheets, so that the MoS2 nanospheres have a large specific surface area, and edge sits of the MoS2 nanosheets are fully exposed. Due to multiporous flower-shaped nanospheres formed by ultra-thin MoS2 nanosheet units, the effective electrochemical catalysis area and the catalytic sites are increased, and the electron conduction rate is quickened, so that overpotential of an oxygen evolution reaction and an oxygen reduction reaction can be effectively reduced; a rotating disk electrode and a rotating ring disk electrode show that the oxygen reduction process is based on a four-electron catalytic mechanism and is a relatively ideal oxygen reduction reaction process.