260 results about "Cyclic voltametry" patented technology

A method and apparatus for welding that includes power source and a wire feeder is disclosed. One or more sensors sense one or more welding conditions before the weld is initiated. A set up circuit is coupled to sensor, the power source, and the wire feeder. The set up circuit automatically sets up the welding machine in response to what the sensor senses. The sensor may be a wire sensor, including a diameter sensor and a material sensor, a gas sensor (if a source of gas is included) such as a cyclic voltametry gas microsensor, a workpiece thickness sensor such as a strain gauge or displacement sensor. Alternatively the sensor includes a bar code reader that reads a code on, for example, the spool of wire, an analog proximity detector, a plurality of proximity detectors, and a displacement sensor.

The invention provides an electrocatalytic hydrogen production porous high-entropy alloy electrode material and a preparation method thereof. The preparation method comprises the following steps: S1,firstly, mixing cobalt powder, chromium powder, iron powder, nickel powder and molybdenum powder, carrying out uniform ball milling by using a planetary ball mill, then adding magnesium powder and carrying out uniform ball milling by using the planetary ball mill, and finally, pressing the mixed powder into a sample blank by using a sample pressing machine; S2, placing the sample blank in a polycrystalline mullite fiber heat preservation barrel, and then placing the heat preservation barrel in a microwave sintering furnace to be subjected to microwave sintering; S3, closing the microwave furnace for cooling along with the furnace, and then closing the microwave sintering furnace, so that the sample is cooled to room temperature along with the furnace to obtain a porous high-entropy alloy;S4, treating the porous high-entropy alloy through cyclic voltammetry for electrochemical activation, thereby preparing the porous high-entropy alloy electrode material. The porous high-entropy alloyelectrode material prepared by the method has the advantages of three-dimensional porous self-supporting structure, high strength, large active specific surface area, low overpotential, small tafel slope, corrosion resistance and the like.

The invention belongs to the technical field of material science and engineering and relates to a pressure molding preparing method for preparing metal and an alloy micro-nano structure or nanowire array of the metal through compression molding. The method includes the following steps that firstly, a metal sheet or an alloy sheet is subjected to surface treatment; secondly, a mold plate is prepared; thirdly, compression molding is conducted; fourthly, demounting is conducted; and fifthly, demolding is conducted. By means of the method, the requirement for a complex cyclic voltammetry pulse electrodeposition technology is avoided, no organic surface active agent needs to be added, and complex sensitizing and activating treatment does not need to be conducted on a hole wall of the mold plate. By the adoption of the method, large-range and uniform metal nanowires (such as Au, Ag, Cu, Fe and Ni nanowires) similar to single crystals and gold and silver solid solution alloy nanowires (such as Au26Ag74 nanowires) can be obtained. By means of the preparing method, low-cost controllable batched preparation of metal and alloy micro-nano structures or nanowires of the metal can be achieved, and the preparing method is of important and profound significance in revealing basic performance principles of metal and alloys of the metal or wide and deep application.

The invention discloses a Schiff base surface active agent named 2-octanone condensation-compound ethylenediamine and application thereof. The structural formula of the 2-octanone condensation-compound ethylenediamine is as follows. The 2-octanone condensation-compound ethylenediamine is applied to alkaline Zn-Ni batteries as mercury substituting corrosion inhibition additives and used for preventing corrosion, dendritic growth, deformation, migration and the like of zinc electrodes. The 2-octanone condensation-compound ethylenediamine can effectively prevent alkaline electrolytes from corroding the zinc electrodes. Moreover, the cyclic voltammetry and zinc migration experiments prove that the 2-octanone condensation-compound ethylenediamine plays good roles in inhibiting the dendritic growth, the deformation and the migration of the pasted zinc electrodes.

A nucleotide triphosphate (NTP) participates in a phosphorylation reaction, wherein a phosphate group is transferred from the NTP to a substrate by a kinase. Provision in a kinase reaction of a NTP whose gamma phosphate is conjugated to an electroactive label results in the transfer of the gamma phosphate-electroactive label conjugate from the NTP to the substrate. The electroactive label is an organic moiety such as a quinone or a mtrohetercycle, or is a metallocene such as a ferrocene or a cobaltocene. Upon transfer of the gamma phosphate-electroactive label conjugate to an electrode-bound substrate by a kinase, the phosphorylation event is detected electrochemically by cyclic voltammetry. Phosphorylation can also be detected by mass spectrometry of a substrate carrying the electroactive label-conjugated gamma phosphate. NTP comprising the gamma phosphate-electroactive label conjugate is used in methods of detecting the presence of a kinase in a sample, screening candidate compounds that modulate kinase activity, and in methods of diagnosing a disease associated with a kinase.

The invention relates to the technical field of biosensors and discloses an estriol hapten and antibody and the application thereof in a fast sensor method for uncojugated estriol detection. The structure of the hapten is scientifically designed, so that sensitivity and specificity of the antigen-antibody are improved; electro-deposition of a prussian blue-chitosan-nanogold composite membrane on the surface of an electrode is conducted, the estriol antigen is fixed to the surface of the membrane, a novel horse radish peroxidase labeled estriol antibody and a sample to be tested are added after an unbound site is sealed, the sample and a fixed antigen compete for a free enzyme labeled antibody, hydrogen peroxide is added after washing, a current signal is measured, a cyclic voltammetry estriol standard curve is obtained, the fast sensor method for uncojugated estriol detection is provided successfully, detection range is 0.001-100 ng / mL, and detection limit is 0.001 ng / mL. The method has the advantages of being easy to operate, high in sensitivity, quick, convenient and the like and can be well applied to ultra-sensitive and fast detection of estriol in the sample.

The invention discloses a Pt-CeO2 modified glassy carbon electrode and its application. According to the electrode, a glassy carbon electrode is used as a carrier, CeO2 is used as a cocatalyst, and Pt is used as an active component. The electrode is prepared by the following preparation step: chloroplatinic acid and a cerous nitrate solution are used as a precursor solution, and codeposition of Pt and CeO2 is carried out on the surface of the polished glassy carbon electrode within an appropriate voltage range by the utilization of a three-electrode system by a cyclic voltammetry method so as to prepare the Pt-CeO2 / GC electrode. The preparation of the electrode requires no addition of a surfactant, is easy to control, and has advantages of mild condition and simple technology. The prepared Pt-CeO2 modified glassy carbon electrode has excellent catalytic activity to ammonia nitrogen in an alkali system. The catalytic activity of the loaded Pt per unit mass to ammonia nitrogen is 0.975mC / microgram. Electrochemical active area of Pt per unit mass is 0.396cm<2> / microgram.

The invention relates to a polymethyl blue / acetylene black composite modified glassy carbon electrode prepared by an electrodeposition method and a dispensing method. The electrochemical behavior of acetaminophen (PCT) on the modified electrode is studied by a cyclic voltammetry (CV). The experimental result shows that the modified electrode has a good electrocatalytic performance for the redox of PCT. Compared with a bare electrode and a polymethyl blue-acetylene black modified electrode, the oxidation peak current of PCT on the polymethyl blue / acetylene black modified glassy carbon electrode is obviously improved. Through the determination of a differential pulse voltammetry (DPV), the PCT has a good linear relationship with the oxidation peak current in the concentration range of 2.0 multiplied by 10<-6> to 0.4 multiplied by 10<-3>mol / L, and the correlation coefficient is 0.992, and the detection limit of PCT is 1.0 multiplied by 10<-6>mol / L when the signal to noise ratio is 3.

A porous conducting metal oxide electrode prepared by depositing a porous conducting metal oxide film containing a conducting metal oxide film layer having a network structure of nanofibers, containing nanograins or nanoparticles, on at least one surface of a current collector, and a conducting metal oxide coating layer on the network layer of the porous conducting metal oxide through a constant current method or a cyclic voltammetric method; and a high-speed charge / discharge and ultrahigh-capacity supercapacitor using the porous conducting metal oxide electrode are provided.