620 results about "Saturated calomel electrode" patented technology

A tandem OLED includes an anode and a cathode. The OLED also includes at least two electroluminescent units disposed between the anode and the cathode, wherein each of the electroluminescent units includes at least one hole -transporting layer and one organic light-emitting layer. An intermediate connector is disposed between adjacent electroluminescent units, wherein the intermediate connector includes an n-doped organic layer and an electron-accepting layer, the electron-accepting layer being disposed closer to the cathode than the n-doped organic layer, and wherein the electron-accepting layer includes one or more organic materials, each having a reduction potential greater than −0.5 V vs. a Saturated Calomel Electrode, and wherein the one or more organic materials constitute more than 50% by volume of the electron-accepting layer.

The invention discloses a method for preparing a hydroxyapatite/nano silver antibacterial composite coating through pulse electrochemical deposition, which comprises: using a calcium salt, phosphate, silver nitrate and a proper amount of coordination agent to prepare electrolyte with certain concentration and pH value, and performing electrodeposition in a electrolytic cell provided with a three-electrode system; taking a saturated calomel electrode as a reference electrode, a platinum sheet as a counter electrode and biological medical metal to be coated as a working electrode, wherein the pulse high electric potential is 0 volt, the pulse low electric potential is -2.0 volts, the pulse width is 100 seconds, and the deposition time is 2 hours; and depositing compositions in the coating on a base material in a mode of ions, uniformly dispersing nano silver generated during deposition in the composite coating, and finally preparing the hydroxyapatite/nano silver antibacterial compositecoating.

An OLED includes an anode formed over a substrate, wherein the anode is a non-oxygen-treated anode and an anode modification layer formed in direct contact with the anode, wherein the anode modification layer includes one or more organic materials, each having an electron-accepting property and a reduction potential greater than 0.0 V vs. a Saturated Calomel Electrode, and wherein the one or more organic materials provide more than 50% by mole ratio of the anode modification layer. The OLED also includes an organic electroluminescent unit formed over the anode modification layer, wherein the organic electroluminescent unit includes at least a hole-transporting layer and a light-emitting layer, and a cathode formed over the organic electroluminescent unit.

The invention discloses a method for preparing hydroxylapatite/chitosan composite coat by electrochemical deposition. The method comprises the following steps: preparing electrolytic solution with certain concentration and pH value from calcium salt, phosphate and chitosan; carrying out electrodeposition in an electrolysis bath with a three-electrode system; using a saturated calomel electrode as a reference electrode, a platinum plate as a counter electrode, and biomedical metal to be coated as a working electrode; depositing compositions in the coat on a base material in ion mode for 25 minutes, with minus 1.2 volts of high pulsing electric potential, minus 2.0 volts of low pulsing electric potential, 100s of pulse width, and evenly dispersing the chitosan in a composite coat, so as to finally produce the evenly hybridized hydroxylapatite/chitosan composite coat.

The invention provides a dopamine polymer/noble metal nanoparticle electrochemical sensor as well as a preparation method and application thereof. The novel bioelectrochemical sensor is a three-electrode system sensor, wherein a reference electrode is a saturated calomel electrode, a counter electrode is a platinum wire electrode, and a working electrode is a glassy-carbon electrode modified by noble metal nanoparticles. According to the invention, noble metal nanoparticles are prepared by dropping a new-made dopamine or a ramification solution thereof and a water solution of a noble metal precursor on the glassy-carbon electrode layer by layer and reacting through a self-assembly method; and a dopamine polymer generated through the reaction has adhesion capacity and can increase the firmness of the noble metal nanoparticles and the glassy-carbon electrode. The dopamine polymer/noble metal nanoparticle electrochemical sensor provided by the invention can be applied to the detection of hydrogen peroxide; and a result indicates that the dopamine polymer/noble metal nanoparticle electrochemical sensor provided by the invention has the advantages of simple and fast preparation method, high firmness, low detection limit, good reproducibility and fast response.

The invention discloses a manufacture method of a silver hybridization mesoporous ferroferric oxide antibiotic immunosensor and the application thereof. The manufacture method of the electrochemical immunosensor includes modifying thionine-graphene mixed solution on the surface of a glassy carbon electrode, conducting cross linking on an antibiotic antibody incubated by Ag-Fe3O4 mesoporous nanometer particles, closing non-specificity active sites by bovine serum albumin to manufacure the antibiotic electrochemical immunosensor. A detection method of antibiotic is that a reference electrode-saturated calomel electrode, an electrode-platinum filament electrode and a working electrode are correctly connected on an electrochemical working station, and immunodetection is conducted through the square wave voltammetry. The antibiotic electrochemical immunosensor has high sensitivity and selectivity, is simple in detection method and has the advantages of being quick, high in efficiency, goodin specificity, low in cost, convenient to operate and the like. It takes to 2-3 minutes to finish one detection process.

The invention relates to an electrochemical polishing method for the high purity aluminium under ultrasonic agitation, which belongs to the fields of the material chemistry and the electrochemistry. The electrochemical polishing method under the ultrasonic agitation comprises the following steps: high purity aluminium foil is added in absolute ethyl alcohol, so as to be cleaned with deionized water and through ultrasonic oscillations, and the natural oxide film in sodium hydroxide is removed; the aluminium foil after being pretreated is used as an anode, the platinum sheet is used as the cathode, the reference electrode is saturated calomel electrode, and the electropolishing solution is the mixed liquor composed of absolute ethyl alcohol and perchloric acid; the electrolysis vessel is positioned in an ultrasonic wave cleaner, and electrochemical polishing is performed on a constant potential rectifier. The self-organizing structure with nanoscale stripe shape is formed on the aluminium surface, the structure is observed by adopting the atomic force microscopy, and the size of the stripe-shaped nanostructure changes under the ultrasonic agitation; the composition of the polishing surface is analyzed through the Raman spectrum and the X-ray diffraction, so as to indicate that the composition of the polishing surface is amorphous aluminum oxide.

The invention relates to a sodion-embedded manganese dioxide nanometer sheet electrode as well as a preparation method and an application of the electrode. The electrode can be used as the active material of a supercapacitor and comprises sodion-embedded manganese dioxide nanometer sheets evenly distributed on the surface of a foamed nickel substrate. The preparation method comprises the following steps of: (1) mixing sodium sulfate and manganese acetate to prepare an electrochemical deposition precursor solution; (2) setting up an electrochemical deposition platform through a three-electrode method and taking the foamed nickel substrate after pretreatment as a working electrode, a platinum electrode as a counter electrode and a saturated calomel electrode as a reference electrode; (3) soaking the electrodes in the electrochemical deposition precursor solution at same depth; (4) opening an electrochemical workstation, setting the working electrode to the anode, setting the working mode to a timing potential mode, and starting up the electrochemical workstation; (5) taking out and washing the working electrode after the electrochemical workstation stops working; and (6) drying to obtain the sodion-embedded manganese dioxide nanometer sheet electrode. The sodion-embedded manganese dioxide nanometer film electrode as well as the preparation method and the application of the electrode disclosed by the invention have the characteristics of simple technique, mild reaction condition and excellent electrochemical performance of materials.

The invention relates to a device for testing abrasion property and corrosion electrochemistry of a corrosion product film, and belongs to the technical field of corrosion simulation experiment and electrochemistry test. The device consists of main parts such as an electric motor, a sealing cover, a rotary disc, a friction block, a sample table, a three-electrode electrochemistry test system, an external electrochemistry test instrument, a thermostatic water bath, and the like; and the rotary friction block of the rotary disc abrades a sample, an electrochemistry test adopts a three-electrode system, and the electrochemistry sample as a working electrode, a platinum wire as a reference electrode surrounding the periphery of the electrochemistry sample and a saturated calomel electrode to form the three-electrode system. The device can measure the abrasion resistant property of the formed corrosion product film, and simultaneously measure electrochemical parameters for the samples covered by the corrosion product film during abrasion to obtain electrochemical parameter values at different time of abrasion of the corrosion product film.

The invention discloses a beef taste quality detection method based on a taste sensor array, and aims at solving the problems that traditional sensory evaluation is difficult to organize and implement, and electronic tongue detection is high in technical cost. The detection method includes the following steps of preparing a detection sample; setting up the taste sensor array, wherein the taste sensor array comprises 12 working electrodes and 1 reference electrode, and the reference electrode is a saturated calomel electrode and serves as the reference electrode of all the working electrodes; conducting sensory evaluation on beef taste quality; detecting the beef taste quality based on the taste sensor array; constructing a beef taste quality prediction model; detecting accuracy of the prediction model, wherein detection data is input by calling the constructed beef taste quality prediction model, and the model runs and outputs a prediction result; the result of the beef broth sample detected by the taste sensor array is compared with the quality grade, obtained through sensory evaluation, of the sample, accuracy of the prediction model is detected, and the result accuracy reaches 90%.

An OLED includes an anode formed over a substrate and a contaminant-scavenging layer formed over the anode, wherein the contaminant-scavenging layer includes one or more organic materials but not a hexaazatriphenylene derivative, each having an electron-accepting property and a reduction potential greater than −0.1 V vs. a Saturated Calomel Electrode, and wherein the one or more organic materials provide more than 50% by mole ratio of the contaminant-scavenging layer. The OLED also includes an organic electroluminescent unit formed over the contaminant-scavenging layer, wherein the organic electroluminescent unit includes a hole-transporting layer, a light-emitting layer, and an electron-transporting layer, and a cathode formed over the organic electroluminescent unit.

The invention relates to an electrochemical sensor based on a molecular engram and a preparation method and an application thereof. The electrochemical sensor based on the molecular engram comprises a working electrode, a reference electrode and a counter electrode, wherein the base electrode of the working electrode is a gold electrode; sulfonated graphene is modified on the surface of the gold electrode; after airing, polymerization is performed in an acid buffer solution containing o-phenylenediamine and dopamine till the oxidation peak current of the o-phenylenediamine falls to zero, and then dopamine is eluted in a sulfuric acid medium; and the reference electrode and the counter electrode are a saturated calomel electrode and a platinum wire electrode respectively. Under an optimal condition, a molecular engram sensor with molecule identifying performance is prepared by an appropriate eluting method, so that rapid analysis and detection of the dopamine are realized. The electrochemical sensor based on the molecular engram has the advantages of quick response, high selectivity, high sensitivity and the like on the molecular engram, the aim of identifying molecules is fulfilled, and detection of the dopamine in the presence of high-concentration ascorbic acid is realized.

The invention discloses a method for electrocatalytic reduction of carbon dioxide. The method comprises the following steps: a three-electrode system is put in electrolyte containing carbon dioxide for electrolysis; the three-electrode system comprises a working electrode, a counter electrode and a reference electrode, wherein the counter electrode is a platinum chip electrode; the reference electrode is a saturated calomel electrode; the working electrode is a glassy carbon electrode after electrode modification; the electrode modification process is to modify the glassy carbon electrode by adopting a modifying agent through a chemical deposition method; and the modifying agent contains a ZIF-8 material or a modified ZIF-8 material. The ZIF-8 materials from different start zinc sources or the modified ZIF-8 materials calcined at different temperatures are applied to different electrolyte anions for electrocatalytic reduction of CO2; and the ZIF-8 materials or the modified ZIF-8 materials are used as electrocatalysts to achieve good selectivity, high efficiency and a certain stability.

The invention relates to a method for electrocatalytic reduction of CO2 using multi-metal oxygen cluster ionic liquid as electrocatalyst. The method is characterized in that positive ions of the multi-metal oxygen cluster ionic liquid are imidazoles [Cnmim]+(n=2, 4, 6, 8), pyridines [Cnpyr]+(n=2, 4) and quaternary ammonium salts [N4444]+, and negative ions of the multi-metal oxygen cluster ionic liquid are phosphotungstic acid negative ions (PW12O403-) and phosphomolybdic acid negative ions (PMo12O403-); and the electrocatalytic reduction reaction is a three-electrode system, wherein a glassy carbon electrode is a working electrode, a platinum sheet electrode is a counter electrode, and a saturated calomel electrode is a reference electrode. The method is simple in process and convenient in operation, performs the electrocatalytic reduction for the CO2 to form such fuels as methane and carbon monoxide, realizes the resource utilization of the CO2, reduces the atmospheric pollution, and has important significance on the environmental protection.

The invention discloses a novel method for simultaneous detection of hydroquinone and pyrocatechol by using a nitrogen-doped graphene-modified electrode. The method comprises the following steps: 1) placing the nitrogen-doped graphene-modified electrode in a sodium phosphate buffer solution which has a concentration of 0.1 mol/L and a pH value of 7 and contains hydroquinone and pyrocatechol with a total concentration of 1* 10<-4> mol/L and carrying out cyclic voltammetric scanning of different scanning speeds with a platinum wire electrode used as a counter electrode and a saturated calomel electrode used as a reference electrode; 2) placing the nitrogen-doped graphene-modified electrode in a sodium phosphate buffer solution which has a concentration of 0.1 mol/L and a pH value of 7 and contains pyrocatechol with a concentration of 1* 10<-5> mol/L and hydroquinone with different concentrations and carrying out differential pulse voltammetric scanning with the platinum wire electrode used as the counter electrode and the saturated calomel electrode used as the reference electrode; and 3) placing the nitrogen-doped graphene-modified electrode in a sodium phosphate buffer solution which has a concentration of 0.1 mol/L and a pH value of 7 and contains hydroquinone with a concentration of 1* 10<-5> mol/L and pyrocatechol with different concentrations and carrying out differential pulse voltammetric scanning with the platinum wire electrode used as the counter electrode and the saturated calomel electrode used as the reference electrode.

The invention relates to a preparation method for alpha-Fe2O3 photoanode applied to photoelectrolysis. According to the preparation method, a conductive base plate is taken as a working electrode, a Pt metal plate, a graphite plate or the like is taken as a counter electrode, and a Ag/AgCl or saturated calomel electrode is taken as a reference electrode. A three-electrode system formed by enabling an electrodeposition apparatus to communicate with an electrochemical workstation is immersed in a solution of a precursor containing Fe<2+>, a voltage is applied for performing anodization electrodeposition on the surface of electro-conductive glass and further for preparing a FeOOH film, and the film sample is subjected to calcining for obtaining the alpha-Fe2O3 photoanode. The preparation method has the advantages of being cheap in apparatus, simple in apparatus structure, convenient to operate, precisely controllable in film thickness, good in stability and environment-friendly. By employing the method for preparing photoanode during photoelectrolysis, the rapid friendly preparation of the alpha-Fe2O3 photoanode can be realized.

The invention discloses a method for preparing an electrode modified by a copper/graphene nanocomposite and an application of the modified electrode. The method comprises the following steps: placing a reduced graphene water solution at the centre of a glassy carbon electrode; drying with an incandescent lamp, and loading graphene to the surface of the glassy carbon electrode to prepare a glassy carbon electrode modified by graphene; in a Na2SO4 solution, by taking the glassy carbon electrode as a working electrode, a platinum wire electrode as an auxiliary electrode, and a saturated calomel electrode as a reference electrode, setting the scanning rate of an electrochemical workstation as 0.1V*s<-1> and circularly scanning for 15 circles in the voltage range from 0.6 to -0.6V to prepare the glassy carbon electrode modified by the copper/graphene nanocomposite. The prepared glassy carbon electrode is used for detecting the concentration of ascorbic acid. According to the method and the application, the copper/graphene nanocomposite is simply and quickly modified to the electrode, thus the sensing area and conductive capacity of the electrode are increased, the transfer of the electrode surface electron is accelerated and excellent electro catalytic oxidation is achieved for ascorbic acid.

The invention discloses an electrochemical biosensor for detecting penicillin and a preparation method and application thereof. The electrochemical biosensor is characterized in that a working electrode is a magnetic glassy carbon electrode immobilized with MWCNTs-Fe3O4/Au-HRP-Ab. The preparation method comprises the following steps: carrying out carboxylation on a multi-walled carbon nanotube, preparing Fe3O4/Au composite nano particles, preparing a Fe3O4/Au magnetic nano particle-HRP-penicillin antibody, sequentially modifying the carbon nanotube subjected to carboxylation and Fe3O4/Au-HRP-Ab to the surface of the glassy carbon electrode of the carbon nanotube, forming the electrochemical biosensor by taking a platinum electrode as a counter electrode and taking a saturated calomel electrode as a reference electrode, immersing the electrochemical biosensor into a sample to be detected, and determining the concentration of the penicillin in the sample to be detected according to a quantitative relation between a corresponding current value and the concentration of the penicillin. The electrochemical biosensor has the advantages of high sensitivity, high selectivity, high accuracy and high detection speed.

The invention relates to a novel DNA aptamer modified bioelectrochemical sensor and a preparation method thereof. The novel bioelectrochemical sensor is of a three-electrode system. The invention is characterized in that in the three electrodes, the counter electrode is a platinum electrode, the reference electrode is a saturated calomel electrode, and the working electrode is a gold electrode; and a DNA aptamer chain is modified on the gold electrode. The novel DNA aptamer modified bioelectrochemical sensor combines the characteristics of the high specificity of the DNA aptamer and the high sensitivity of an electrochemical detection method and ensures that the early diagnosis of cancer cells becomes possible.

The invention belongs to the technical field of lithium metal batteries, and particularly relates to a method for preparing an anode porous copper current collector used for a lithium metal battery. The method at least comprises a first step of cleaning the surface of a Cu-X alloy sheet with a solvent to remove impurities on the surface of the Cu-X alloy sheet; a second step of preparing an acid solution; and a third step of preparing the porous copper current collector by scanning different numbers of turns from -1 V to different cut-off voltages by adopting linear scanning cyclic voltammetry in an electrochemical workstation, with a three-electrode system being utilized, platinum or nickel being adopted as a counter electrode, a saturated calomel electrode being adopted as a reference electrode, the Cu-X alloy sheet being adopted as a working electrode, and the acid solution prepared in the second step being adopted as an electrolyte. Compared with the prior art, the porous copper current collector having different pore diameters are etched through an electrochemical process by utilizing the Cu-X alloy sheet as a substrate and adopting acids having different concentrations as media. The current collector is used as a lithium metal battery anode current collector, and has functions of providing deposition space for lithium metal and limiting growth of lithium dendrites.

The invention discloses preparation of a three-dimensional graphene manganese dioxide nano-composite modified electrode and a capacitive property test method thereof. An ionic liquid modified electrode is prepared firstly, and then three-dimensional graphene and manganese dioxide nanomaterial are electrodeposited on the surface of the ionic liquid modified carbon paste electrode by utilizing a constant potential method so that a three-dimensional graphene manganese dioxide nano-composite modified carbon paste electrode is obtained. The three-dimensional graphene manganese dioxide nano-composite modified electrode acts as a working electrode, a platinum sheet acts as an auxiliary electrode and a saturated calomel electrode acts as a reference electrode, and capacitive property of three-dimensional graphene manganese dioxide nano-composite material is tested by applying a cyclic voltammetry, an AC impedance method and a constant current charge and discharge method. The three-dimensional graphene manganese dioxide nano-composite modified electrode is simple in preparation method, high in single electrode capacitance and great in cycle performance so as to be suitable for rapidly testing capacitive property of super-capacitor electrode material.