218 results about "Silver chloride electrode" patented technology

The invention provides a load-type monoatomic catalyst. The catalyst is formed by uniformly loading monodispersed metal atoms on the surface of a nano substrate material. A preparation method thereofcomprises the following steps: in an electrolyte solution containing metal salt, performing electrochemical deposition by using a three-electrode system, using a glassy carbon electrode loaded with the nano substrate material as a working electrode, using a graphite rod as a counter electrode, using a silver / silver chloride electrode as a reference electrode, performing linear volt-ampere scanning, enabling the metal atoms to be monodispersely and uniformly deposited on the nano substrate material, to obtain the load-type monoatomic catalyst. The load-type monoatomic catalyst is capable of, based on electro-deposition, constructing a monoatomic structure, through an electro-deposition method, rapidly, efficiently, and controllably depositing single atoms, and realizing deposition of positive and negative electrodes, and the obtained load-type monoatomic catalyst has important significance to a general application in the catalytic and particle physical field.

The invention relates to a three-dimensional copper nanowire array current collector for a lithium ion battery and a production method of the three-dimensional copper nanowire array current collector. The three-dimensional copper nanowire array current collector consists of a copper nanowire array growing on a copper surface. Red copper is employed as a cathode, a solution of sodium hydroxide or potassium hydroxide is employed as electrolyte, stainless steel is employed as an anode, and a saturated mercury chloride electrode is employed as a reference electrode. The production method comprises the following steps of (1) introducing inert gas into an electrolytic bath to remove oxygen, controlling the current density, and electro-oxidizing the cathode to form a Cu(OH)2 thin film on the surface of the red copper to obtain a Cu(OH)2 nanowire array; (2) placing the Cu(OH)2 nanowire array in a hydrogen atmosphere, thermally reducing the Cu(OH)2 nanowire array in a reactor, and naturally cooling to room temperature to obtain the three-dimensional copper nanowire array current collector. A product has high electrical conductivity and an ultra-large specific surface area, and can be produced at a low reaction temperature by simple procedures without a template; a three-dimensional Cu nanowire array has a controllable morphological structure and high uniformity.

The invention discloses a three-electrode integrated electrochemical sensor based on a microelectrode array. The sensor comprises the bismuth film modified microelectrode array (gold working electrode), a silver / silver chloride electrode (reference electrode) and a platinum electrode (counter electrode). The three electrodes are prepared through a standard MEMS technology, and multiple discs at equal intervals are evenly distributed on the gold electrode to serve as the microelectrode array. In the electrochemical detection process, heavy metal gathering and dissolving-out reacting occur on the microelectrode array, and the surface of the microelectrode array is modified with a bismuth film in order to increase the detection type of heavy metal and expand the detection range of the heavy metal. The surface of the silver electrode is electroplated with silver chloride to form the Ag / AgCl reference electrode. The platinum electrode serves as the counter electrode and forms an access with the working electrode. Difference pulse stripping voltammetry is utilized for determining the concentration of the heavy metal, and a result shows that the sensor is high in detection sensitivity, low in detection limit and high in signal-to-noise ratio; the sensor is easy and convenient to operate, needs a small quantity of samples, can be used for rapidly detection heavy metal on site and is capable of efficiently monitoring environmental pollution in real time.

The invention discloses a construction method of a cuprous oxide membrane-based enzyme free-oxygen sensitive glucose photo electrochemical sensor. The construction method comprises the following steps: with an ITO conductive glass as a working electrode, a platinum wire as a counter electrode and a silver / silver chloride electrode as a reference electrode, inserting the three electrodes into a sodium hydroxide solution containing 0.05mol / L copper sulfate and 0.1mol / L sodium citrate, and regulating a pH value to be 11; under the conditions that the deposition temperature is 60 DEG C, the deposition potential is -0.4V and the deposition time is 20 minutes, forming a cuprous oxide membrane on the surface of the ITO conductive electrode; and rinsing residual solution on the surface with pure water, drying for 1h at the temperature of 100 DEG C, and forming a stable cuprous oxide membrane-based photocathode. According to the construction method disclosed by the invention, photocurrent detection based on light excitation is low in detection signal background and can have high detection sensitivity and stability without needing expensive instrument and equipment and complex sample treatment.

The invention relates to a device and a method for measuring the chemical oxygen demand in water based on flowing injection sampling feeding, which belongs to the technical field of environment monitoring. The measuring device is composed of a flowing injection sampler feeder, a three-electrode system electrochemical circulation detecting pool and an electrochemical working station. The invention is characterized in that a working electrode of the electrochemical circulation detecting pool is a boron-doped diamond film electrode and is fixed on an inlet channel by a fastening bolt and is lined with a lock ring. The inlet channel, a reference electrode mounting channel and an outlet channel enlightened on an insulating, hard and corrosion-resistant pool body are mutually communicated. When in measurement, the pH value of a carrier liquid is 3 to 10 with a concentration of 0.05 to 0.5 mol / l. When the reference electrode adopts a saturated calomel electrode or an Ag / AgCl electrode, a positive voltage applied on the working electrode of the boron-doped diamond film electrode is 2.2 to 3.2V. The invention realizes the fast and accurate measurement of COD with no pollution.

The invention provides a preparation method of a carbon-free binder-free all-metal three-dimensional porous H2O2 electrooxidation catalytic electrode. The preparation method comprises: a metal salt of Ni, Co or Cu and a surfactant are fully dissolved in pure water, so that the concentration of Ni<2+>, Co<2+> or Cu<2+> in the solution is 0.05 mol / L to 0.5 mol / L, and the concentration of the surfactant in the solution is 0 mol / L to 2.0 mol / L; a three-electrode system is formed by Ni foam or a stainless steel wire as a working electrode, a platinum electrode as a counter electrode and a silver-silver chloride electrode as a reference electrode; and with an electrochemical method, an active component choosing from Ni, Co or Cu is deposited on an Ni foam substrate or a stainless steel wire substrate to form the carbon-free binder-free all-metal three-dimensional porous H2O2 electrooxidation catalytic electrode, and the electro-deposition time is 5 s to 200 s. The method of the invention is simple, has strong operability, has wide sources of the raw materials, and can be widely applied to the preparation of a DPPFC (direct hydrogen dioxide fuel cell) anode.

The invention relates to a method for preparing methane and ethylene through carbon dioxide electrochemical reduction. The method comprises the steps that an H-shaped dual-electrochemical-cell reactoris adopted, and is isolated into a cathode chamber and an anode chamber through a proton exchange membrane; before the reaction, carbon dioxide gas is led into the cathode chamber; a three-electrodesystem is adopted, a gas diffusion electrode serves as a work electrode, a platinum electrode serves as an auxiliary electrode, and a silver / silver chloride electrode serves as a reference electrode;the gas diffusion electrode comprises a gas diffusion electrode body and a carbon dioxide electrochemical reduction catalyst loaded gas diffusion electrode body; the carbon dioxide electrochemical reduction catalyst is graphite phase nitrogenated carbon supported nanometer copper oxide, and the nanometer copper oxide has tenorite and red copper ore. Through the method, the faradic efficiency of carbureted hydrogen of methane, ethylene and the like can be improved.

The invention provides a poly (3,4-ethylenedioxythiophene) nanowire thin film. The poly (3,4-ethylenedioxythiophene) nanowire thin film is prepared according to the following synthetic method that in a three-electrode electrolytic cell, a mixed solution of 3,4-ethylenedioxythiophene monomer, a supporting electrolyte and an electrolytic solvent serves as an electrolyte solution, a gold electrode, a platinum electrode and an indium tin oxide conductive glass electrode or a fluorine-doping tin oxide conductive glass electrode serves as a working electrode, the gold electrode or the platinum electrode serves as an auxiliary electrode, a silver / silver chloride electrode serves as a reference electrode, polymerization reaction is conducted through a cyclic voltammetry or a potentiostatic method at the room temperature, and thus the poly (3,4-ethylenedioxythiophene) nanowire thin film deposited on the working electrode is obtained, so that a finished product is obtained after post-processing leaching and drying are conducted. According to the poly (3,4-ethylenedioxythiophene) nanowire thin film, the preparation method is simple and convenient, the reaction condition is mild, the product purity is high, and the prepared polymer thin film has an electrochromic performance and can be used as an electrochromic material to be applied to an electrochromic device.

The invention discloses a device and a method for tracking and detecting ion transmembrane migration number. The device comprises a liquid storage tank, a cover plate, an electrode, a big separator board, a small separator and the like. All the components have the following mutual connection relation: the cover plate and the liquid storage tank are connected with each other from top to down through clamping; a titanium electrode is fixed on a tank wall of the liquid storage tank through a slot; a silver / silver chloride electrode is fixed in the centre of the left and right parts of the cover plate; and the separators are connected with a separator of the liquid storage tank through a nut. The invention can be used for researching influence on ion migration by a film and ion selectivity of the film, and membranoid substances all can test the ion transmission performance of the film through the device, and can be applied to external electric field, thereby the device has the advantages of simple operation, low cost and strong comprehensive function.

The invention discloses a human body bioelectricity monitoring garment which comprises a garment body, processing units and at least one electrode. The processing units are arranged on the garment body. Each electrode is connected to the corresponding processing unit. The electrodes can be various metal electrodes such as silver electrodes, gold-plated electrodes and other conductive metal electrodes, silica gel electrodes comprising silver chloride electrodes and textile fabric electrodes comprising flexible fabric electrodes. The electrodes are arranged on the front face or / and the back face of the garment body. The processing units are arranged in the middle of the upper portion of the front face of the garment body. According to the human body bioelectricity monitoring garment, obtaining convenience of biological information and other data can be improved; meanwhile, a user can be helped to obtain individual biological data and indexes with better pertinency and guidance, analysis is carried out according to different indexes, and therefore the better exercise and fitness effect and human body dynamic data monitoring are obtained.

The invention discloses an electrode device for measuring a seabed weak electric field signal and a manufacture method of the electrode device. The electrode device comprises a silver / silver chloride electrode, an electrode boot, an electrode protective cover and a signal transmission connector, wherein the silver / silver chloride electrode comprises a silver / silver chloride electrode sheet, a micropore tube, an organic glass rod and a mixture of silver chloride powder and diatomite; the electrode boot and the electrode protective cover are made of ABS (Acrylonitrile Butadiene Styrene) materials; the upper part of the electrode boot is designed for realizing the connection of the signal transmission connector with the silver / silver chloride electrode and the sealing of the silver / silver chloride electrode; the lower part of the electrode boot and the electrode protective cover are provided with multiple pores in the surfaces; the signal transmission connector is sealed on the top end by using an O-shaped ring and the electrode boot; and the electrode protective cover is fixed on the bottom of the electrode boot. The electrode device provided by the invention has lower noise, betterweak signal distinguishing capacity and good stability, and can be used for accurately measuring the seabed weak electric field signal.

The invention discloses an electrochemical test method of steel bar corrosion in the concrete of coastal area. The test method comprises the following steps: (1) under the concrete condition of the temperature of 0 to 50 DEG C and the relative humidity of 50 percent to 85 percent, the resistance rate R of the concrete is detected; if the estimated value of R is more than or equal to 20kilo-ohm, the passive film of the steel bar in the concrete is not damaged; if the estimated value of R is less than 20kilo-ohm, the second step is adopted; (2) a silver-silver chloride electrode is used for further determining the corrosion potential of the steel bar; if the estimated value of the corrosion potential of the steel bar is more than or equal to minus 119mV, the passive film of the steel bar in the concrete is not damaged; if the estimated value is less than 119mV, the passive film of the steel bar in the concrete is not damaged. The corrosion current density Jcorr of the steel bar in the concrete is further determined; the average corrosion depth and the average section loss rate of the steel bar are calculated. The guarantee rate of the estimated values is 95 percent. The electrochemical test method has the targeted characteristic and comprehensive criteria, and is in particular suitable for estimating the corrosion of the steel bar in the concrete structure without obvious cracking and rust on the surface.

The invention relates to a method for furan-2,5-dicarboxylicacid from 5-hydroxymethylfurfural through electrochemical oxidation. The method includes the following steps that an H-type double-electrochemical-cell reactor is adopted and divided into a cathode chamber and an anode chamber through a proton exchange membrane for separation; a three-electrode system is adopted, a catalyst supported electrode serves as a working electrode, a platinum electrode serves as an auxiliary electrode, and a silver / silver chloride electrode serves as a reference electrode. The working electrode includes a working electrode body and a 5-hydroxymethylfurfural electrochemical oxidation catalyst supported on the working electrode body, wherein the 5-hydroxymethylfurfural electrochemical oxidation catalyst isthe activated carbon supported oxidized-state or reduced-state copper-nickel bimetallic catalyst. The method can improve the yield and Faradic efficiency of the product, namely, furan-2,5-dicarboxylicacid.

The invention discloses a silver / silver chloride reference electrode and a manufacturing method of the reference electrode. The silver / silver chloride reference electrode comprises an electrode sleeve, a composite metal wire electrode (2) and reference salt (3), wherein the electrode sleeve comprises an electrode shell and a salt bridge (4) which are connected together; the material of the salt bridge (4) is borosilicate glass; the silver / silver chloride reference electrode is fully sealed; the composite metal wire electrode (2) comprises a section A, a section B, a section C and a section D which are sequentially connected with one another. The manufacturing method of the silver / silver chloride reference electrode comprises the steps of filling salt and sealing. The reference electrode is simple to manufacture, low in cost, high in reproducibility, high in stability, high in reversibility, fast in response to signal, easy to store, free of pollution to research system and in particular suitable for industrial production. The reference electrode is suitable for researching electrochemical properties of a chloride mixed fuse salt system at the temperature of 350-650 DEG C.

The preparation process of novel residual chlorine detecting electrode includes selecting glass-carbon electrode, gold electrode, platinum electrode or graphite electrode as base electrode, and platinum filament as counter electrode, and saturated calomel electrode or silver / silver chloride electrode as reference electrode; soaking surface pre-treated base electrode in 0.1 M concentration perchloric acid solution containing 1-5mM concentration aurochlorohydric acid at room temperature; and three-step step potential process to obtain stable nanometer gold particle modified electrode. The obtained nanometer gold particles of 50-150 nm diameter are arranged compactly and orderedly on the surface of the base electrode. The modified electrode has excellent catalytic performance on the electrochemical reduction reaction of residual chlorine and the electrochemical reduction reaction of chlorine dioxide and dissolved oxygen.

The invention discloses a bisphenol A sensor of nano-porous gold modified based on aptamer and a method. The sensor and the method are used for performing direct electrochemical detection in high sensitivity and high selectivity on the bisphenol A (BPA). A gold-silver alloy film is placed in concentrated nitric acid to corrode the silver to obtain an NPG film. The NPG is used for modifying a glassy carbon electrode, and then modifying the aptamer of the BPA to manufacture the sensor. The NPG represents excellent electrochemical catalysis activity to the redox reaction of the BPA, thereby guaranteeing the high sensitivity of the sensor. The aptamer fixed on the NPG is capable of greatly prompting the selectivity of the sensor, the BPA captured by the aptamer displays the redox peak at 0.35V / 0.28V (with respect to silver / silver chloride electrode). The experiment optimizes the important experimental parameter. The linear detection range of the detection method is 0.1nM to 100nM, and the detection limit is 0.056+ / -0.004nM. The most noteworthy is that the sensor can be successfully applied to the detection of BPA in a human serum sample.

The invention discloses a bismuth tungstate nano-film with photocatalytic performance as well as a preparation method and application thereof. The bismuth tungstate nano-film comprises an underlayer and a bismuth tungstate nanolayer grown on the underlayer and consisting of a bismuth tungstate nano-structure, wherein the underlayer is fluorine-doped tin oxide conductive glass. The preparation method comprises the following steps: adopting potassium iodide and bismuth nitrate as raw materials, fluorine-doped tin oxide conductive glass as a working electrode, a platinum plate electrode as a counter electrode, and a silver / silver chloride electrode as a reference electrode, and performing ion exchange, calcining and other steps to obtain the bismuth tungstate nano-film. The bismuth tungstate nano-film can be used for photocatalytic water-splitting hydrogen production in a photoelectrochemical tank, has the nanotopography of a one-dimensional nanosheet with a large specific surface area and also has the visible-light photocatalytic water-splitting hydrogen production activity. The preparation method is simple in operation process, mild in reaction condition, short in reaction time and strong in operation controllability.

The invention provides an all-solid state dissolved oxygen sensor, which comprises a substrate, and reference electrode, a counter electrode and a working electrode parallelly positioned on the substrate, wherein the reference electrode consists of a reactive electrode, a silver / silver chloride electrode positioned on the reactive electrode and a lead wire connected with the reactive electrode; the counter electrode and the working electrode consist of reactive electrodes and lead wires connected with the reactive electrodes; an insulating layer capable of exposing the silver / silver chloride electrode, the reactive electrode of the counter electrode and the working electrode covers on the substrate; an electrolytic layer covers on the silver / silver chloride electrode, the reactive electrode of the counter electrode and the reactive electrode of the working electrode; and an oxygen permeable membrane covers on the electrolytic layer. In the all-solid state dissolved oxygen sensor, three electrodes of the conventional dissolved oxygen sensor are integrated on one substrate so as to realize the miniaturization of the dissolved oxygen sensor, and the all-solid state dissolved oxygen sensor has the advantages of convenient carrying, simple operation and quick response. The invention also provides a preparation method for the all-solid state dissolved oxygen sensor, which has the advantages of simplifying a manufacturing process, reducing manufacturing cost, and being suitable for mass production.

The invention discloses a method for evaluating the corrosion resistance of a welded joint based on the potential testing technology. The method includes the following steps that 1, a welded joint sample is machined and then polished on a metallographic polishing machine, and the welded joint is corroded with a metallographic corrosion solution; 2, a proper welded joint corrosion solution is prepared according to the main influence factors in a service environment of the welded joint; 3, a saturated calomel electrode or a silver or silver chloride electrode is adopted in cooperation with a salt bridge, and a lower port of the salt bridge is closed with agar containing potassium chloride, wherein the caliber of the lower port ranges from 50 micrometers to 100 micrometers, and a saturated potassium chloride solution is contained in the salt bridge; 4, an experimental device is built, a drop of corrosion solution is dripped on the welded joint through a microinjector, the lower port of the salt bridge is adjusted to be immersed into the drop of the corrosion solution on the welded joint, and parallel mode or new area testing is performed; 5, indexes are evaluated. By means of the method, the problems that few evaluation methods for the corrosion resistance of the welded joint are available, and experimental testing devices are complex are solved.

The present invention provides a nickel refining method which uses nickel sulfide produced from nickel oxide ore using a hydrometallurgical process, as the raw material, and in which chlorine leaching is performed using a chloride solution, wherein a cementation reaction is caused between the nickel sulfide and copper ions, using copper ions, preferably included in the leaching solution itself, and a portion of the nickel in the nickel sulfide is leached into the solution, and the remaining nickel and copper are left as a residue, and copper and nickel are chlorine leached from this residue, and wherein the cementation reaction is performed with an oxidation-reduction potential as measured by a silver-silver chloride electrode of below -20 mV, preferably below -100 mV.

The invention discloses a luminol and trisruthenium-based potential-resolved electrochemiluminescence detection method. Luminal and trisruthenium are used as luminescent probes. During detection, an ITO (indium tin oxide) electrode is used as a working electrode for luminescence detection, a silver-silver chloride electrode is used as a reference electrode, a potassium electrode is used as a counter electrode, and a luminescent signal from luminol is detected by performing scanning from 0.6V to 0.0V; peroxydisulfate and an excessive amount of luminol are added into a detection system, and a luminescent signal from trisruthenium is detected by performing scanning from 0.0V to -1.0V. The invention also discloses a simple and effective method for simultaneously detecting two cell surface cancer biomarkers. According to the methods, two antigens on the surfaces of cells can be analytically detected by one step by double-tagging and potential resolving methods, the mutual interference of signals under different potentials is eliminated, and carcinoembryonic antigens and alpha fetoprotein antigens on surfaces of cells are successfully detected at the same time.

The invention discloses a composite material modified electrode used for measuring glucose concentration and application thereof. According to the invention, firstly a polyamino acid modified electrode is prepared by virtue of a cyclic voltammetry, then the cyclic voltammetry is adopted for depositing metal nanoparticles on the surface of the polyamino acid film modified electrode, and a polyamino acid / metal nanocomposite material modified electrode is prepared. The obtained modified electrode is taken as a working electrode, a silver / silver chloride electrode is taken as a reference electrode, a platinum cylinder electrode is taken as an auxiliary electrode, and an amperometry is applied in a three-electrode system for realizing linear electrochemical response of glucose in a certain concentration range. The modified electrode has the characteristics of sensitive response and good stability.

A method for preparing a silicon-carbon anode material for a lithium ion battery belongs to the field of lithium ion batteries. The method comprises the following steps of: 1) adding SiO2 powder to anaqueous solution of sucrose for stirring and mixing, evaporating the solution to dryness, and drying the solid; 2) grinding the sucrose coated with SiO2, heating to 300-1100 degrees centigrade for sucrose cracking, and then grinding, tableting, and sintering; 3) wrapping the obtained carbon-coated SiO2 tablet with foamed nickel, attaching the fine molybdenum wire to the metal molybdenum wire as acathode, connecting the graphite rod and the stainless steel wire as an anode, and regarding the silver-silver chloride electrode as a reference electrode; 4) after heating CaCl2 to melt, inserting the cathode, the anode and the reference electrode into the molten salt, applying a voltage of 1.5 to 3.0V between the cathode and the anode, electrolyzing the constant cell pressure for 10 to 15 hours, taking the cathode after electrolysis out from the molten salt for cooling, cleaning and drying, so as to obtain a silicon-carbon anode material for a lithium ion battery. The method may be made into a silicon-carbon anode material for a lithium ion battery with excellent performance, and is environmentally friendly, low in cost and simple in operation.

The invention discloses a poly-3,4-ethylenedioxythiophene nano mesh structure film as well as a preparation method and an application thereof. The poly-3,4-ethylenedioxythiophene is of a nano mesh structure. The poly-3,4-ethylenedioxythiophene film is specifically prepared by the following steps: by taking 3,4-ethylenedioxythiophene as a monomer in a three-electrode cell system, taking lithium perchlorate as supporting electrolyte, and taking acetonitrile as an electrolytic solvent, uniformly mixing to obtain electrolyte; and by taking an indium tin oxide conductive glass electrode as a working electrode, taking a platinum electrode as an auxiliary electrode, and taking a silver / silver chloride electrode as a reference electrode, carrying out an electrochemical polymerization reaction at aroom temperature by adopting cyclic voltammetry or a potentiostatic method, thereby obtaining a polymer film deposited on the working electrode, eluting, and drying, thereby obtaining the poly-3,4-ethylenedioxythiophene. The conductive polymer film prepared by the method disclosed by the invention has a special nano mesh structure. Compared with an ordinary plane structure, the conductive polymerfilm has excellent electrochromic property.

The invention relates to a sensor based on a concentration cell principle. The sensor is used for quantitatively detecting glucose concentration in human blood. As shown in the figures, the sensor comprises two electrodes (1) and (2), wherein the electrodes are in contact with solutions in two electrochemical pools (3) and (4), respectively; the two electrochemical pools have ion exchange through a nafion film (5); electro-active materials are contained in the two electrochemical pools (3) and (4). In the detection process, to-be-detected matter in a sample changes the concentrations of the electro-active materials in the electrochemical pools by reacting, thereby changing an electric signal (such as current or voltage) between the two electrodes; quantitative detection is performed by detecting a relation between the electric signal detected by (6) and the concentration of the to-be-detected matter. A reference electrode (such as a silver / silver chloride electrode) required by traditional electrochemical sense is not required by the sensor, the two electrodes can be made of the same material (such as graphite), the manufacturing technique is simple, and the cost is low; the influences of interfering matter in a sample on the detection can be eliminated, and thus the detection accuracy is increased.

The invention provides Ag / AgCl RE and a manufacturing method of Ag / AgCl RE. A platinum electrode lead (4) is arranged on a glass substrate (5) of Ag / AgCl RE, and an Ag / AgCl electrode layer (2) is arranged at the tail end of Ag / AgCl RE; the glass substrate (5) is covered with a silicon substrate (1) by bonding with the glass substrate; a cavity opening downwards and containing at least the Ag / AgClelectrode layer (2) is arranged on the silicon substrate (1), and the cavity and the glass substrate (5) form a liquid storage chamber (7) used for storing a potassium chloride saturated solution, multiple nanometer-sized tapered micropores with large outer wall apertures and small inner wall apertures subjected to corrosion etching by using a wet method are formed in the top wall of the liquid storage chamber (7) to form an array of the tapered micropores (3), and each tapered micropore (3) is taken as a nanochannel for ion exchange between the two parts by contacting with an external to-be-tested object; a liquid injection hole (12) is formed in the glass substrate (5), and provided with a sealant (8); according to the invention, the ion exchange rate is greatly reduced by a nano-pore array, so that the service time of the potassium chloride saturated solution and the service life of RE can be obviously improved, the manufacturing method of Ag / AgCl RE is based on a micro-nano processing technology, and Ag / AgCl RE can be manufactured through integration with other electrodes to realize the miniaturization of a whole detection sensor.

The invention relates to a simple electro-deposition Co-Ce / NF electrode material and preparation and application thereof.The preparation method comprises the following steps: (1) dissolving a cobalt source, a cerium source and ammonium chloride in deionized water and mixing the components until the solution is clear, thereby preparing an electro-deposition solution; (2) in an electro-deposition device filled with the electro-deposition solution in the step (1), with foamed nickel as a working electrode for connection, a silver chloride electrode as a reference electrode and a platinum wire electrode as a counter electrode, preparing a Co-Ce / NF material through a one-step electro-deposition method; and (3) washing and drying the obtained Co-Ce / NF material to obtain the target product Co-Ce / NF electrode material. Compared with the prior art, according to the Co-Ce / NF electrode material synthesized by the invention, rare earth elements cerium and cobalt form an alloy to generate a synergistic effect; the electrochemical performance of the cobalt alloy is improved by using the activity of rare earth elements, the surface area of the material is increased by using foamed nickel as a carrier, and in addition, the synthesis method is simple, convenient, low in energy consumption and excellent in electrochemical performance and is expected to be applied to industrial large-scale production.

The invention discloses a silver / silver chloride electrode slice and a preparation technology thereof, and belongs to the field of electrochemical sensors. The silver / silver chloride electrode slice comprises a supporting layer, a silver layer, a protection layer and a silver chloride layer. The preparation method for the silver / silver chloride electrode slice comprises plating the silver layer on the supporting layer through a vacuum silver-plating manner, then covering the protection layer on a part of the silver layer, and finally preparing the silver chloride layer through a chemical oxidation process, so as to prepare the silver / silver chloride electrode slice. The prepared silver / silver chloride electrode slice overcomes the disadvantages that a conventional silver / silver chloride electrode slice is low in precision, short in response time, bad in signal stability among batches, not suitable for organic environment and tedious in preparation technology, and the like. The silver / silver chloride electrode slice is stable in electric potential performance, high in precision, low in signal to noise ratio, low in impedance, short in response time, low in production cost, high in production efficiency and suitable for large-scale industrial production.

The invention belongs to the field of chemical analysis and relates to an analysis method of sulfate radicals in a sulfate and thiosulfate mixture. The method provided by the invention comprises the following steps: a) preparing and calibrating a lead nitrate standard solution, preparing an ethanol aqueous solution of lead nitrate, shifting the sulfate radical standard solution with known volume and concentration, using the aqueous solution added with ethanol as a medium, adjusting the pH value to be 4-5, inserting a lead ion-selective electrode and a silver-silver chloride electrode, carrying out automatic potentiometric titration by utilizing the lead nitrate standard solution and computing the concentration of the lead nitrate standard solution; and b) measuring the content of the thiosulfate by directly utilizing iodine standard solution titration to analyze the sulfate radicals, using the aqueous solution added with the ethanol into the solution to be measured as the medium, adjusting the pH value to be 4-5, inserting the lead ion-selective electrode and the silver-silver chloride electrode, carrying out the automatic potentiometric titration by utilizing the lead nitrate standard solution and measuring the total content of the sulfate and the thiosulfate, thereby computing the content of the sulfate radicals.