16 results about "Working electrode" patented technology

The invention relates to a method for measuring formaldehyde in aqueous solution by utilizing electrochemical luminescence of terpyridyl ruthenium. The aqueous solution sample containing the formaldehyde is taken to be mixed with terpyridyl ruthenium solution with the pH value of 8.6 and the concentration of 1mmol/L, wherein, the concentration of the formaldehyde aqueous solution is 0.9-300mg/L; after that, cyclic voltammetry is carried out within the range of 0.2-1.5v, and the speed is 0.1v/s; a working electrode of electrochemical luminescence measurement is a glassy carbon electrode, and then linear relation exists within a certain range according to the electrochemical illumination intensity and the concentration of the formaldehyde; quantitative analysis is carried out on the formaldehyde in the aqueous solution. The method can be used for measuring the content of the formaldehyde within the concentration range of 0.9-300mg/L. The method for measuring formaldehyde by utilizing electrochemical luminescence has the advantages of simple operation, rapid measuring speed, lower price of an analytical instrument and the like, and can be expected to be used for daily analysis.

The invention provides a method for preparing flowerlike nanometer cobalt by using electro-conductive glass FTO, an anodised aluminum template (AAO) and an aqueous high-molecular adhesive as a combined electrode. The method comprises the following steps: (1) preparation of a working electrode: a step of coating the electro-conductive glass with a solution of the aqueous high-molecular adhesive--polyvinyl alcohol (PVA) through spin coating and bonding the anodised aluminum template so as to obtain the FTO/PVA/AAO combined electrode; (2) preparation of an electrolyte: separately preparing cobaltous sulfate and a boric acid solution and mixing the cobaltous sulfate with the boric acid solution; (3) electrodeposition reaction: a step of carrying out constant-voltage electrodeposition on the combined working electrode; and (4) post-treatment: a step of soaking the working electrode having undergone electrodeposition in sodium hydroxide to remove the anodised aluminum template. According to the invention, FTO/PVA/AAO is used as the combined working electrode and constant-voltage electrodeposition is carried out so as to prepare the novel flowerlike nanostructured cobalt; and the method is simple and fast and has the advantages of mild reaction conditions, short time, high efficiency and no need for high temperature and high pressure conditions compared with conventional methods.

The invention discloses a preparation method of a paper-based photocathode biosensor for detecting microRNA. A gold nano-particle layer is coated in a working area of a paper-based carbon working electrode; polyhedral cuprous oxide is electrodeposited and lots of silver sulfide quantum dots can be loaded, and a photoelectric sensitized structure is formed, so that the cathode photocurrent is increased substantially; and in the presence of the target microRNA, a double-strand-specific-nuclease-induced target cycle reaction and a cascaded stem-branch hybridization strand reaction are made to obtain a negatively charged dendritic DNA double-helix structure. After assembling of positively charged gold nanoparticles, a gold tree with the good glucose oxidase mimicking activity is formed, so that the glucose oxidation reaction is catalyzed, the dissolved oxygen of the electron acceptor is consumed, the cathode photocurrent signal is reduced, and sensitive detection of the microRNA is realized.

The invention discloses a composite electrode material, a preparation method and a super capacitor. The preparation method of the composite electrode material comprises: after carbon cloth loaded withCo-MOF is calcined, obtaining carbon cloth loaded with Co<3>O<4> nanosheets; and taking the carbon cloth loaded with the Co<3>O<4> nanosheet as a working electrode, and carrying out electrodepositionin an electrolyte to obtain the composite electrode material. The electrolyte comprises aniline and 0.8 to 1.2 M of sulfuric acid, and the electro-deposition time is 10 to 14 minutes. The compositeelectrode material provided by the invention is the composite electrode material in which carbon cloth is loaded with core-shell structure nanosheets, wherein the core is Co<3>O<4> nanosheets, and theshell is made from polyaniline. According to the composite electrode material disclosed by the invention, the Co<3>O<4> nanosheets obtained in preparation and the core-shell structure nanosheets in aproduct uniformly grow on carbon cloth, and collapse is avoided; and the composite electrode material can be directly used as a working electrode, is high in specific capacitance, good in cycling stability and large in specific surface area, and can improve the utilization rate of active substances.

This invention relates to the Sb2Te3 single-crystal nanometer line ordered array and its making method, the character is that the solutin is composed of the following componets: the citric acid coordination Sb3+; 4í†1 by Moore chroma,, nitrate dissolution Te power, 2í†3 by the SbO+í†HTeO2+ Moore chroma, wherein the pH of the plating liquid is 1-3, it uses the porous alumina templetits in the plating liquid as its working electrode and the black lead as its assistant electrode, its current density is controlled between 0.2mA/cm2 and 0.5mA/cm2, plating 0.5-2h can obtain the Sb2Te3 compound single-crystal nanometer line which grows in the 110 direction; and its single-crystal with hexagonal crystal series structure grows in the 110 direction, wherein the crystal cell parameter as follows:aú¢bú¢0.426nmíócú¢3.05nm. this invention fistly is under the condition of room-temperature and open system, and it uses electrochemical sediment principle to make the Sb2Te3 single-crystal nanometer line ordered array; the device in this invention is simple, which is easy to operate, and it fits for industry production.

The invention disclose a tyrosine-sensing electrochemical working electrode, in particular relates to a tyrosine-sensing electrochemical working electrode based on a molybdovanadophosphoric heterpolyacid-doped carbon nanotube / chitosan-copper chelate, belongs to the technical field of electrochemical sensors, and aims at solving the problems of narrow linear ranges, low sensitivity and high preparation cost of tyrosine detection non-enzyme electrochemical sensors in the prior art. The tyrosine-sensing electrochemical working electrode comprises an ITO electrode and a PEI / [P2Mo16V2-MWCNTs /CTS-Cu]n film externally coating the ITO electrode, a molybdovanadophosphoric heterpoly acid-doped carbon nanotube / chitosan-copper chelate layer is a cycle, the number of the cycles is n, and n = 1-10. The electrochemical sensor constructed based on the working electrode has good tyrosine sensing property, the linear range is 4.99 * 10<-8>M-6.88 * 10<-5>M (M:mol / L), and the sensitivity is 0.206 mu M /mu A.

The invention discloses a preparation method of a compound modified electrode for simultaneously detecting lead and cadmium ions. The preparation method comprises the following steps: preparing graphene; preparing nano graphene; preparing micro-nano carbon spheres; synthesizing a micro-nano carbon sphere, nano graphene and naphthol compound modification liquid; modifying a working electrode based on a micro-nano carbon sphere, nano graphene and naphthol compound modification liquid; and simultaneously detecting heavy metal lead ions and cadmium ions. When the modified electrode manufactured by the method is applied to a sensor, the simultaneous sensitive detection of heavy metal lead ions and cadmium ions with similar potentials is realized, the detection sensitivity and the detection speed can be effectively improved, and the detection limit is far lower than the minimum content requirement of the heavy metal lead ions and cadmium ions in drinking water; and the compound modified electrode is simple in structure, low in energy consumption, raw material cost, process cost and labor cost, excellent in mechanical property and chemical corrosion resistance, and capable of achieving the effects of saving energy, reducing emission, treating environmental pollution and guaranteeing life health, and the whole detection system is convenient to achieve miniaturization and automation.

The invention provides a reduced graphene/alpha-Fe2O3 supercapacitor material and a preparation method and application thereof. The preparation method of the reduced graphene/alpha-Fe2O3 supercapacitor material comprises the following steps: (1) dissolving Fe (NO3) 3.9H2O, CTAB, urea and graphene oxide dispersion in a methanol solution and performing hydrothermal reaction at 160-200 DEG C for 8-24h; (2) pumping and filtering the reaction product obtained in the step (1), adding the obtained solid and thiourea into water, uniformly mixing and transferring to a reaction kettle and performing hydrothermal reaction at 160-200 DEG C for 8-24 hours; and (3) pumping and filtering the product obtained in the step (2), freezing and drying and then performing heat treatment. The supercapacitor material is simple in preparation of the working electrode, and the electrochemical working window in the alkaline electrolyte is from -1.05 V to -0.3 V and the maximum specific capacity can be 1296 F/g so as to be an ideal negative electrode material. The shortcoming of low specific capacity of the negative electrode material of the supercapacitor can be overcome, the problem of mismatch between thepositive electrode and negative electrode specific capacity of the supercapacitor can be solved and thus the material has high research value.

The invention discloses a novel formaldehyde sensor comprising a casing. An electrode carrier, a working electrode and a counter electrode are fixedly connected to the inner side wall of the casing. Aworking electrode lead and a counter electrode lead are connected to the working electrode and the counter electrode respectively; and one end of each of the working electrode lead and the counter electrode lead passes through the casing and extends to the outside. Therefore, the outer dimension of the casing is reduced; and a phenomenon of the sensor abnormity caused by the internal resistance increasing due to dehydration of the perfluorinated proton exchange membrane is avoided.

For solving the problems in the prior art, the invention provides a device and method for removing arsenic from yellow phosphorus through continuous electrocatalytic oxidation, wherein the device comprises a current controller, a cathode chamber, an anode chamber and a control system, wherein the cathode chamber and the anode chamber are isolated from each other through a permeable membrane. A working electrode and a reference electrode are arranged in the anode chamber, a stirrer is arranged at the bottom, and a counter electrode is arranged in the cathode chamber. The electrodes are respectively and electrically communicated with a current controller. One side of the anode chamber is sequentially communicated with a sedimentation tank group and a liquid separation device, and the liquidseparation device is respectively communicated with the top end of the anode chamber and the storage tank. The method is based on the device and comprises the steps: controlling to form a nitrogen atmosphere, and controlling the temperature of the anode chamber to be 55-90 DEG C; and respectively adding an electrolyte into the anode chamber and the cathode chamber, and adding yellow phosphorus into the anode chamber; standing for phase splitting after constant-current stirring reaction; and leading the solution in the sedimentation tank group to the anode chamber or the storage tank through the liquid separation device, wherein the solid phase part is a product. According to the invention, continuous production of electrocatalytic oxidation yellow phosphorus arsenic removal can be realized.

The invention relates to an optical system (10) comprising:-an optical element (20) comprising a functional glass substrate (1) and an electrochromic stack (2) formed on the substrate (1), the electrochromic stack (2) comprises a first transparent conductive layer, a working electrode disposed over the first transparent conductive layer, a counter electrode disposed over the working electrode, a second transparent conductive layer disposed over the counter electrode, lithium ions introduced within the electrochromic stack, and a separate ion conductor layer preferably interposed between the electrode and the counter electrode; -a protective layer (3) disposed on the electrochromic stack (2), the protective layer (3) comprising an inorganic lubricating compound.

According to one embodiment of the present disclosure, a redox flow battery is provided comprising an ionically conductive separator, a working side flowing electrolyte, a working electrode in ionic contact with the working side of the ionically conductive separator and the working side flowing electrolyte, a counter electrode, and an auxiliary electrode peripherally circumscribed by the working electrode in a common layer of the flow battery. The auxiliary electrode is in ionic contact with the working electrode, an electrically insulating peripheral gap separates the auxiliary electrode from the working electrode. A working electrode terminal is conductively coupled to the working electrode, an auxiliary electrode terminal is conductively coupled to the auxiliary electrode, and a counter electrode terminal is conductively coupled to the counter electrode. An auxiliary power source is configured to establish an auxiliary circuit voltage differential between the counter electrode terminal and the auxiliary electrode terminal, control an auxiliary electrode voltage such that the auxiliary electrode voltage is within an electrochemical window of the working side flowing electrolyte, and establish a voltage differential between the working electrode terminal and the auxiliary electrode terminal. A method of operation of the redox flow battery is further provided

A solution TOC concentration in-situ initial measurement and pre-judgment method adopts a three-electrode system of a voltammetry method, takes a graphite electrode as a working electrode, takes a mercurous sulfate electrode as a reference electrode, takes a platinum electrode as a counter electrode, adopts a current-time mode of an electrochemical workstation to measure diffusion current, and establishes a linear relation between the current and the TOC concentration; according to the diffusion current of a to-be-detected solution, the initial measurement value of the TOC concentration is calculated from the established standard curve, and accordingly whether the to-be-detected solution needs to be diluted or not and the specific dilution multiple are judged. The method is suitable for initial measurement and pre-judgment of the TOC concentration in water bodies such as soil solutions, natural water and domestic sewage. The method is convenient and rapid, can effectively solve the tedious time-consuming and labor-consuming problems of blind on-machine measurement, multi-dilution on-machine measurement and the like when a TOC analyzer is used for measuring a high-content TOC sample, greatly reduces the loss of an oxidizing agent and a catalyst in the TOC analyzer adopting a wet oxidation or high-temperature catalytic combustion oxidation method, protects the column efficiency, and prolongs the service lives of the oxidant and the catalyst.