83 results about "Saturated calomel electrode" patented technology

The invention relates to a bioelectrochemical sensor used for detecting hydrogen peroxide and a manufacturing method of the bioelectrochemical sensor. The novel bioelectrochemical sensor is a sensor with a three-electrode system, wherein the counter electrode is a platinum electrode, the reference electrode is saturated calomel electrode and the working electrode is gold electrode. The sensor is based on orientation combination of a polypeptide horse radish peroxidase with characteristic sequence, the promotion effect of the polypeptide horse radish peroxidase on the activity of the enzyme and the characteristic of high sensitivity of electrochemical detection methods. The sensitivity of hydrogen peroxide sensors is effectively improved and satisfactory results are obtained.

The invention discloses a nitrite electrochemical sensor based on a graphene oxide and polytromethamine composite material and a preparation method and application thereof, and belongs to the field of electrochemical method detection, the preparation method comprises the following steps: uniformly dispensing a graphene oxide suspension on the surface of a glassy carbon electrode, and airing to obtain GO / GCE; putting the GO / GCE, a saturated calomel electrode and a platinum wire electrode into an electrolyte containing tromethamine with a certain concentration, and carrying out electropolymerization by adopting a cyclic voltammetry to obtain Poly (Tris) / GO / GCE; a saturated calomel electrode is used as a reference electrode, a platinum wire electrode is used as a counter electrode, Poly (Tris) / GO / GCE is used as a working electrode, and the nitrite electrochemical sensor is constructed and is more accurate and sensitive in nitrite detection, the linear detection range is 2 * 10 <-6 >-6 * 10 <-3 > mol / L, and the detection limit is 1.00 * 10 <-7 > mol / L.

The invention discloses a preparation method of a Bi / Bi4NbO8X piezoelectric photocatalyst with an amorphous crystal interface. The preparation method comprises the following steps: sequentially adding Bi2O3, Nb2O5, BiOX (X is Cl or Br), NaX and LiX into deionized water according to a ratio, stirring for a certain time at 0 DEG C, putting the mixture into a tubular furnace, calcining to obtain a Bi4NbO8Xl precursor material, and dissolving the precursor material into an ethylene glycol solution to obtain the electrolyte. FTO is used as a working electrode, a graphite rod is used as a counter electrode, a saturated calomel electrode is used as a reference electrode, constant current deposition is carried out at room temperature for a certain time, precipitates are collected and washed with deionized water and absolute ethyl alcohol, and centrifugation and drying are carried out. According to the preparation method, amorphization of a matrix is successfully induced, an amorphous / crystalline interface is formed, meanwhile, Bi metal is separated out in situ, and a Bi / Bi4NbO8X (X is Cl or Br) heterostructure is formed. The formation of an amorphous / crystalline interface and a Bi / Bi4NbO8X (X = Cl, Br) heterostructure effectively promotes the separation efficiency of photo-generated charges, so that the catalyst realizes efficient tetracycline (TC) degradation capacity.

The application discloses a low-driving-potential aluminum alloy sacrificial anode for a seawater cooling water system, which comprises a sacrificial anode body and a core, the core is wrapped in the sacrificial anode body, the sacrificial anode body is mainly composed of aluminum, and gallium, tin, antimony and copper are added, the weight percentage of each component is as follows: 0.3-0.5% of gallium, 0.01-0.1% of tin, 0.005-0.02% of antimony, 0.01-0.1% of copper, less than or equal to 0.06% of impurity iron, and the balance of aluminum. The working potential of the low-driving-potential aluminum alloy sacrificial anode for the seawater cooling water system is-0.75V to-0.90V (relative to a saturated calomel electrode), the electric capacity is greater than or equal to 2300 Ah / kg, the sacrificial anode surface dissolves uniformly, the corrosion product is easy to fall off, and the low-driving-potential aluminum alloy sacrificial anode is suitable for cathode protection of high-strength steel, titanium-steel composite structure, stainless steel and other materials in a seawater environment. The application further discloses a preparation method of the low-driving-potential aluminum alloy sacrificial anode for the seawater cooling water system.

The invention discloses a high-entropy alloy fiber material of a core-shell structure and a preparation method and application thereof, and belongs to the technical field of alloy material preparation.The method comprises the steps that a buffering agent is dissolved in deionized water to obtain a solution A, the solution A is heated, a complexing agent, additional salt, a reducing agent and soluble metal salt are sequentially added, stirring and dissolving are conducted, and a solution B is obtained; adjusting the pH value of the solution B, and standing at room temperature to obtain an electrolyte; performing ultrasonic cleaning, flushing and drying on the conductive fibers with acetone, ethanol and deionized water respectively; a saturated calomel electrode is used as a reference electrode, a conductive fiber is used as a working electrode, a carbon electrode bar is used as a counter electrode, the three electrodes are immersed in an electrolyte, a constant-potential electro-deposition method is used, electro-deposition is carried out on the surface of the conductive fiber, and the high-entropy alloy fiber is obtained. Uniform electro-deposition of the high-entropy alloy on the surface of the fiber is achieved, and the high-entropy alloy fiber material with excellent conductivity is obtained.

The invention discloses a self-weight configuration oxygen evolution electrode and a preparation method and application thereof.The preparation method comprises the steps that a nickel substrate serving as a working electrode, a platinum sheet serving as a counter electrode and a saturated calomel electrode serving as a reference electrode are placed in a NiCo2O4 precursor solution, constant-potential electro-deposition is conducted on the nickel substrate, and a precursor electrode with a Ni-Co LDH precursor on the surface is obtained; putting the precursor electrode into a heating device for heating and heat preservation, and then taking out the precursor electrode for cooling to obtain a NiCo2O4 electrode with a spinel structure; and sequentially putting the NiCo2O4 electrode into a ferric nitrate nonahydrate aqueous solution and a sodium hydroxide solution, and loading alpha-Fe2O3 nanoparticles on the surface of the NiCo2O4 electrode by using a continuous ion layer adsorption reaction method to obtain the self-weight configuration oxygen evolution electrode. According to the preparation method of the self-weight configuration oxygen evolution electrode, a composite catalyst layer composed of NiCo2O4 and alpha-Fe2O3 of a spinel structure is constructed on a nickel substrate, and the self-weight configuration oxygen evolution electrode can adapt to power fluctuation.

This invention discloses a method for preparing a Pd-BiOI / ordered mesoporous carbon electrode, comprising: step S1, preparing an ordered mesoporous carbon electrode material using a soft template method under low-temperature hydrothermal conditions; step S2, using a three-electrode system, with the ordered mesoporous carbon electrode material as the working electrode, a platinum sheet as the counter electrode, and a saturated calomel electrode as the reference electrode, using a hydrochloric acid solution containing PdCl2 as the electrolyte, and depositing a Pd / OMCs electrode using a multi-step current pulse method; step S3, adding KI to ethylene glycol and dissolving it by magnetic stirring; then adding Bi(NO3)3•5H2O and stirring magnetically to obtain a mixture a; placing the mixture a and the Pd / OMCs electrode prepared in step S2 in a high-pressure reactor lined with polytetrafluoroethylene, and performing a hydrothermal reaction under high-temperature conditions, followed by rapid cooling after the reaction, removing the electrode and rinsing it with distilled water to obtain the Pd-BiOI / OMCs electrode. The Pd-BiOI / ordered mesoporous carbon electrode prepared by this invention has both excellent electroadsorption and visible light photocatalytic performance, and is expected to become an ideal electrode material integrating electroadsorption and photocatalysis.

The invention discloses an amidoxime modified LDH-O-PA two-dimensional nanosheet array electrode material as well as a preparation method and application thereof, and belongs to the technical field of inorganic nanomaterial synthesis. A substrate is subjected to electrochemical synthesis in an electrolyte solution containing soluble nitrate and ferrous sulfate by taking a saturated calomel electrode as a reference electrode and Pt as a counter electrode, and the amidoxime modified LDH-O-PA two-dimensional nanosheet array electrode material is obtained. The preparation method comprises the following steps: directly growing a hydrotalcite nanosheet array on a conductive substrate of which the surface is cleaned by adopting a potentiostatic method, performing activation modification on the basis by utilizing a cyclic voltammetry method, and further performing organic combination on the basis, thereby finally synthesizing the organic-inorganic-organic hybrid electrode material. And then assembling with amidoximation polyacrylonitrile to prepare the electrode. The invention provides a new method for synthesizing the nanosheet array by a one-step electrosynthesis method, and the oxygen exposure degree in the target compound can be adjusted by regulating the constant potential time and the voltage, so that the product has larger surface area and dispersion stability, and has a good synergistic adsorption effect on heavy metal ions.

The invention relates to the technical field of water electrolysis and chlor-alkali industry electro-catalysis hydrogen evolution, in particular to a method for preparing a rare earth metal monatomic catalyst through an electrochemical method. The method comprises the following steps: fully dissolving rare earth metal salt in an electrolyte solution; the carrier material is used as a working electrode, a carbon rod is used as a counter electrode, a saturated calomel electrode is used as a reference electrode, one or more rare earth metal salts are dispersed in an electrolyte, and the rare earth metal monatomic catalyst is prepared through one-step electrochemical deposition; or the rare earth metal salt is deposited through an electrochemical method to load the first metal monatomic, and then is loaded with the second metal monatomic or more metal monatomic through a post-deposition method to prepare the composite monatomic catalyst containing the rare earth metal monatomic. According to the method, the rare earth metal monatomic catalyst with extremely low standard electrode potential can be prepared, energy consumption in the preparation process can be reduced, loading and exposure of rare earth metal monatomic on the surface of the carrier can be achieved at the room temperature, and then the rare earth metal monatomic catalyst cooperates with other transition metal monatomic.

The invention discloses a preparation method and application of a nickel-molybdenum polyacid-polymer-based self-supporting electrocatalyst with low platinum-carbon loading capacity, and relates to the technical field of electrocatalysts. The preparation method of the electrocatalyst comprises the following steps: weighing raw materials for preparing an electrolyte solution; comprising nickel sulfate, ammonium molybdate, chloroplatinic acid, borax, polyvinyl alcohol and chitosan. Uniformly mixing the raw materials with deionized water to obtain a nickel molybdenum polyacid solution, a borax solution and a PVA-CS solution, obtaining a target electrolyte solution, and soaking the target electrolyte solution with carbon paper; freezing and drying; performing carbonization; the treated carbon paper is used as a working electrode, a saturated calomel electrode is used as a reference electrode, and a graphite electrode is used as an auxiliary electrode; and platinum is electrodeposited on the carbon paper by adopting a cyclic voltammetry electrodeposition method to prepare the electrocatalyst. According to the prepared electrocatalyst, the cost can be reduced, the reaction kinetics of an alkaline solution and alkaline seawater can be improved, the overpotential can be reduced, the stability can be improved, and the alkaline seawater electrolysis process is more economical and efficient.

The application discloses a flexible transparent aqueous zinc ion battery polyaniline / vanadium oxide composite positive electrode sheet and a preparation method thereof, and belongs to the technical field of aqueous zinc ion batteries. The preparation method comprises the following steps: using vanadyl sulfate aqueous solution as an electroplating solution, using a gold grid / PET as a working electrode, and using a platinum sheet as a counter electrode to construct a two-electrode structure; a vanadium oxide layer is deposited on the surface of the gold grid / PET by adopting a constant-voltage electrochemical deposition method, and a vanadium oxide / gold grid / PET is prepared; sulfuric acid and polyaniline are added into deionized water to prepare an electroplating solution, the vanadium oxide / gold grid / PET is used as the working electrode, the platinum electrode is used as the counter electrode, and a saturated calomel electrode is used as a reference electrode to construct a three-electrode structure; a polyaniline layer is deposited on the surface of the vanadium oxide / gold grid / PET by adopting a constant-voltage electrochemical deposition method, and the composite positive electrode sheet is obtained.

This invention relates to the field of electrochemical detection technology for vitamin E, specifically to an electrochemical detection device and method for vitamin E. The method includes: utilizing a detection system composed of a glassy carbon electrode, a saturated calomel electrode, and a platinum wire electrode; performing a series of optimizations and screenings to determine the SWV electrochemical detection method; and electrode pretreatment: using 0.05 μm alumina powder to perform circular polishing on the glassy carbon electrode in both directions for 3-4 minutes, followed by ultrasonic cleaning with anhydrous ethanol and pure water for three minutes each time. Finally, the electrode is scanned using the SWV method in a prepared buffer solution until it stabilizes. The beneficial effects are: this invention is convenient and simple to operate, has a simple formulation that greatly optimizes the detectable limit, has low manufacturing cost and is readily available, and requires no electrode modification; the lowest detectable concentration is far below the minimum normal range of vitamin E in human blood.

The application discloses a device and method for electrochemically evaluating an oxidation layer of oriented silicon steel, which comprises an electrolytic cell, a magnet group arranged on one side of the electrolytic cell, a saturated calomel electrode and a platinum electrode arranged on the electrolytic cell, and an electrochemical workstation connected with the electrolytic cell; the magnet group comprises fixed magnets fixed on the electrolytic cell and movable magnets magnetically connected with the fixed magnets, and the movable magnets are arranged on the outlet of the side surface of the electrolytic cell; the reference electrode is arranged between the magnet group and the auxiliary electrode; and the reference electrode and the auxiliary electrode are connected with the electrochemical workstation. The evaluation method of the application calculates the dissolution electric quantity of each layer of the oxidation layer of the oriented silicon steel by electrochemically measuring the potential-time curve of the oriented silicon steel sample, realizes the rapid and accurate determination of each layer of the oxidation layer of the oriented silicon steel, and can distinguish the performance of the Mg2SiO4 glass film bottom layer, the SiN layer, the SiO2 layer, the FeO layer and the fayalite layer, thereby providing guidance for the control of the production process parameters of the oriented silicon steel.

The invention discloses a PEM electrolytic cell porous transmission layer and a preparation method thereof. The preparation method comprises the steps that a titanium-based sheet material is cut according to a preset size, a substrate is obtained after pretreatment, and the titanium-based sheet material is a titanium felt or porous titanium; precious metal is dissolved in pure water to obtain a metal solution, a stabilizer is added into the metal solution, and electrolyte is obtained after stirring; a substrate serving as a working electrode, a platinum sheet serving as a counter electrode and a saturated calomel electrode serving as a reference electrode are placed in the electrolyte, precious metal is deposited on the substrate under preset electrodeposition parameters, and a sample is obtained after cleaning and airing; the sample is placed in a tubular furnace to be calcined, and the PEM electrolytic cell porous transmission layer is obtained through aftertreatment. According to the technical scheme, the porous transmission layer of the PEM electrolytic cell prepared through the technical steps can improve the porosity of the porous transmission layer, reduce the contact resistance between the porous transmission layer and a membrane electrode and improve the activity of the electrolytic cell, so that the purpose of improving the performance of the electrolytic cell is achieved.

The invention discloses a FeCo-based amorphous nanofiber electrocatalyst and a preparation method and application thereof, the FeCo-based amorphous nanofiber electrocatalyst takes a FeCo-based metal strip as the electrocatalyst, the component is Fe40Co (40-x) CuxP13C7, and x is more than or equal to 0 and less than 40. The preparation method comprises the following steps: mixing Fe, Co, Cu, P and C powder according to the atomic percentage of each element, carrying out vacuum smelting, then carrying out high-vacuum electric arc smelting, preparing a uniform strip by a grinding system through a single-roller melt-spinning method, soaking the strip in alcohol, slightly polishing on fine sandpaper to remove an oxide layer so as to enable the strip to be smooth, and carrying out high-temperature sintering. The preparation method comprises the following steps: cleaning and drying the raw materials to obtain a working electrode, taking a saturated calomel electrode as a reference electrode, taking a Pt sheet electrode as a counter electrode, dealloying the working electrode through 0.2 V vs. SCE, and passivating the dealloyed electrode through negative voltage to obtain the FeCo-based amorphous nanofiber electrocatalyst. The FeCo amorphous nanofiber strip is prepared by adopting an electro-dealloying method, has good oxygen evolution catalytic performance and can be used as an oxygen evolution electro-catalyst.

This disclosure provides a coordination-regulated, high-stability aqueous organic flow battery adapted for frequency regulation in thermal power energy storage and its preparation method. The preparation method includes: adding deoxygenated deionized water to organic anode active material and anode coordination regulator, introducing an inert gas, stirring, and adding a pH adjuster to adjust the solution pH, followed by stirring to form an anode electrolyte; adding deoxygenated deionized water to organic cathode active material and cathode coordination regulator, introducing an inert gas, stirring, and adding a supporting electrolyte, followed by stirring to form a cathode electrolyte; immersing an ion exchange membrane in a modification solution and stirring to obtain a modified membrane; immersing the modified membrane in an alkali metal solution to activate ion exchange sites; immersing the electrode in a doping solution for dispersion treatment and drying to obtain a doped electrode; using this doped electrode as the working electrode, a platinum sheet as the counter electrode, and a saturated calomel electrode as the reference electrode, and performing cyclic voltammetric activation in H2SO4 solution.

The present invention provides a preparation method of a high-entropy metal sulfide electrode material. A three-electrode system is constructed with a substrate material as the working electrode, a saturated calomel electrode as the reference electrode, and a Pt sheet as the counter electrode. A mixed solution of at least five metal nitrates containing different transition metal ions is used as the electrolyte, and electrodeposition is carried out under the three-electrode system to obtain a metal hydroxide electrode precursor. The electrode precursor is subjected to sulfidation treatment to obtain a high-entropy metal sulfide electrode material. The present invention also provides an electrolytic cell using the above high-entropy metal sulfide electrode material as the anode electrode, which can efficiently and with low energy consumption oxidize sulfide ions in sulfur-containing wastewater and then assist in hydrogen production by electrolyzing water. At the same time, the electrolytic cell uses a carbon-modified sodium ion exchange membrane, which can effectively avoid the shuttle of sulfide ions and improve the efficiency and purity of hydrogen production at the cathode. As a new solution combining environmental treatment and clean energy hydrogen production, the present invention has important significance and application prospects.

The application discloses a Cu-As nanometer composite electrocatalyst with cross dispersion among different components and a one-step electrodeposition preparation method thereof, and is characterized by the following method: a three-electrode system is used, a saturated mercury electrode is used as a reference electrode, a platinum sheet is used as a counter electrode, and carbon cloth is used as a working electrode; an electrolyte contains HCl, CuCl2.2H2O and NaAsO2; a chronocoulometric electrochemical technology is used for electrodeposition at a constant potential; the deposited material is sequentially rinsed with deionized water and anhydrous ethanol; and finally, drying is performed to obtain the Cu-As nanometer composite electrocatalyst with cross dispersion among different components. The application realizes controllable preparation of the nanometer composite electrocatalyst with controllable cross dispersion of Cu and As components, and has important significance for simplifying a process, improving material performance and promoting the development of electrochemical energy technology.

The invention relates to a method for electrochemically detecting chloramphenicol by using molecular imprinting. The method is characterized in that a chloramphenicol molecularly imprinted polymer prepared from a temperature-sensitive monomer N-isopropylacrylamide and Dawson type tungsten phosphate (P2W18) are jointly modified on a substrate electrode through a simple and controllable electrostatic layer-by-layer self-assembly method. The modified electrode synthesized by the method disclosed by the invention is used as a working electrode, a saturated calomel electrode is used as a reference electrode, a platinum electrode is used as an auxiliary electrode, and the electrochemical sensing performance of the modified electrode on chloramphenicol is respectively evaluated by cyclic voltammetry, differential pulse voltammetry and square wave voltammetry. According to the modified electrode, the sensitivity of an electrochemical signal is synergistically enhanced through the high-selectivity imprinting cavity of the molecularly imprinted polymer and the rapid and reversible oxidation-reduction activity of P2W18, the detection linear range of chloramphenicol is 0.1 nM to 10 [mu] M, and the detection limit of differential pulse voltammetry is as low as 0.145 nM; and a good application prospect is provided for preparing a uniform and controllable molecularly imprinted polymer composite modified electrode material in the future. At present, an indissolvable molecularly imprinted polymer material is integrated into an electrochemical sensor through an electrostatic layer-by-layer self-assembly technology, so that the research on improving the selectivity of chloramphenicol detection and reducing the detection limit is rarely reported.

The present invention discloses an imprinted electrochemical sensor for detecting chlorpromazine and a preparation method thereof. A saturated calomel electrode is used as a reference electrode, a platinum wire electrode is used as a counter electrode, and a stainless-steel acupuncture needle is used as a working electrode. Using the stainless-steel acupuncture needle as a substrate, copper and gold nanoparticles are sequentially modified on the surface of its tip through electrodeposition of metals to obtain an Au / Cu / ANE electrode. The electrode is immersed in a polymerization solution containing 3-aminophenylboronic acid and chlorpromazine, and an imprinted polymer film is formed by cyclic voltammetry electro-polymerization. Finally, the chlorpromazine molecules in the polymer film on the electrode surface are extracted by an eluent, so that an imprinted cavity capable of specifically recognizing chlorpromazine molecules is formed on the polymer film. The sensor prepared by the present invention can quickly detect the content of chlorpromazine in a solution, and the polymer film on the sensor surface can provide numerous imprinted sites for the oxidation of chlorpromazine. Moreover, it has strong anti-interference ability, high sensitivity, high stability, low cost, and simple preparation process.

The invention belongs to the technical field of water electrolysis hydrogen production materials, and discloses an IrSnOx / Ti porous transmission electrode and a preparation method and application thereof. The preparation method comprises the following steps: S1, pretreating the surface of the titanium felt; s2, taking a titanium felt as a cathode and a platinum sheet electrode as an anode, performing constant-current tin deposition in the tin electrodeposition liquid until the tin loading capacity is 0.3 mg / cm < 2 >-2mg / cm < 2 > to obtain a Sn / Ti electrode, washing the Sn / Ti electrode with deionized water, and drying the Sn / Ti electrode; s3, in a three-electrode system, taking Sn / Ti as a working electrode, taking a saturated calomel electrode and a platinum sheet electrode as a reference electrode and a counter electrode, and carrying out constant-voltage electrodeposition on amorphous iridium oxide in the iridium oxide electrodeposition liquid until the loading capacity of iridium is 0.2 mg / cm < 2 >, so as to obtain an IrSn / Ti electrode; s4, the IrSn / Ti electrode is subjected to heat treatment for 0.5-5 h at the temperature of 200-500 DEG C, and the IrSnOx / Ti porous transmission electrode is obtained. The use amount of precious metal of the membrane electrode can be effectively reduced, the titanium felt is uniformly coated, and the stability is excellent.

The invention relates to the technical field of platinum nanosheet catalysts, and discloses a double-nonmetal-doped ultrathin platinum nanosheet catalyst and a preparation method thereof.The preparation method comprises the steps that 1, a precursor solution containing a platinum source and hydrochloric acid is prepared; 2, under the room temperature condition, a three-electrode system with the conductive substrate as a working electrode, platinum foil as a counter electrode and a saturated calomel electrode as a reference electrode is adopted, and platinum nanosheets are prepared in an electroplating mode under the condition of applying potential; and step 3, putting the platinum nanosheet obtained in the step 2 and a dual-nonmetal source into a tubular furnace, and carrying out annealing treatment in an inert atmosphere to obtain the catalyst. The catalyst provided by the invention avoids the problem of poison of PEMFC and corrosion of a carbon carrier due to precipitation of doped metal on the premise of ensuring catalytic activity and stability, and the problem of poorer stability caused by corrosion of the PEMFC and the carbon carrier is solved.

The present invention provides an electrochemical sensor based on metal organic framework nanomaterials and its application in detecting nitrite and / or ammonia nitrogen, relating to the field of detection technology. The metal organic framework nanomaterial (Ti‑MOF / Ag / CNT) provided by the present invention has specific selectivity and sensitive current response capability to nitrite and ammonia nitrogen. As an electrochemical modification material of an electrode, it is possible to improve the current response capability of the electrode to nitrite and ammonia nitrogen. The present invention uses a Ti‑MOF / Ag / CNT modified electrode as a working electrode, a saturated calomel electrode as a reference electrode, and a platinum sheet electrode as a counter electrode to electrochemically detect nitrite and ammonia nitrogen. The Ti‑MOF / Ag / CNT modified electrode realizes simultaneous detection of nitrite and ammonia nitrogen, and has high sensitivity, high accuracy and high precision for the detection of nitrite and ammonia nitrogen.

The present application relates to a kind of based on titanium dioxide composite photoelectrode method for removing bisphenol A and hexavalent chromium in sewage cooperatively, with 3D BQD@TiO2 photoelectrode as working electrode, 3D TiO2 as counter electrode, saturated calomel electrode as reference electrode to construct three-electrode system, with the water body to be treated containing bisphenol A, hexavalent chromium and sodium sulfate as electrolyte solution, under light source irradiation, bias is applied, photoelectrocatalytic removal bisphenol A and hexavalent chromium in water body to be treated.The present application can realize the simultaneous removal of bisphenol A (BPA) and hexavalent chromium (Cr (VI)) complex pollution in water, 100% removal of BPA and Cr (VI) can be realized within 30 min under simulated sunlight, after 5 times of cycle, the removal rate of BPA and Cr (VI) still maintains 99.1% and 95.6% respectively, with efficient and stable photoelectrocatalytic oxidation and reduction performance.

The invention discloses a preparation method of a high-orientation CuFeTe2 thin film for a solar cell, which belongs to the technical field of solar cells and comprises the following steps: an FTO (Fluorine-doped Tin Oxide) base cleaning step and an electro-deposition solution preparation step, a constant-potential deposition step: under atmospheric pressure, using a constant-potential three-electrode system to place the FTO base in an electro-deposition solution for electro-deposition, presetting deposition temperature, deposition time and deposition potential, the deposition potential being-1.0 V; wherein the FTO base is a working electrode, the saturated calomel electrode is used as a reference electrode, the electrode is a platinum electrode, and the temperature of an electrodeposition solution is controlled by a water bath method; and cleaning and annealing. According to the method, the CuFeTe2 thin film is prepared through electro-deposition, the deposition potential is optimized, so that the CuFeTe2 thin film forms preferred orientation on the crystal face (101), the crystal structure of the thin film is remarkably improved, the thin film is continuous and compact within a certain range, and the deposition effect is optimal.

This invention discloses a method for detecting the alumina content in aluminum-manganese-calcium alloys, mainly solving the technical problem that existing methods cannot accurately and rapidly detect the alumina content in aluminum-manganese-calcium alloys. The technical solution is as follows: a method for detecting the alumina content in aluminum-manganese-calcium alloys, comprising: 1) sample preparation: after removing the oxide layer on the sample surface, the sample is placed in a reagent bottle containing organic solvent for storage; 2) alumina extraction from the sample: first, alumina is extracted from the sample by electrolysis, the sample is placed in an electrolytic cell for electrolysis, the sample is the anode, a platinum electrode is the cathode, and a saturated calomel electrode is the reference electrode; 3) detection of alumina in the sample: the filter membrane and filter material from step 2) are placed in a platinum crucible, and the filter membrane is removed by high-temperature ashing; 4) calculation of the mass percentage of alumina in the aluminum-manganese-calcium alloy. The method of this invention for determining the alumina content in aluminum-manganese-calcium alloys has a relative standard deviation (RSD) of less than 3%, indicating good precision, accuracy, and reliability of the detection data.

The application discloses a kind of nickel hydroxide coated copper dendrite electrocatalyst, which is prepared by the following method: a piece of foamed copper is soaked in hydrochloric acid solution, the surface oxide layer is removed, and then washed with water and ethanol and dried; the foamed copper substrate is placed in copper sulfate solution, with saturated calomel electrode as reference electrode, carbon rod as counter electrode, and foamed copper as working electrode; electrodeposition is carried out at-1.2 to-1.0V, and then washed with water to obtain copper dendrite loaded foamed copper; the copper dendrite is placed in nickel nitrate solution, with saturated calomel electrode as reference electrode, carbon rod as counter electrode, and foamed copper as working electrode; electrodeposition is carried out at-1.1 to-0.9V, and then washed with water and dried to obtain nickel hydroxide coated copper dendrite electrocatalyst; and a preparation method of nickel hydroxide coated copper dendrite electrocatalyst is provided. The preparation process of the application is simple, the reaction time is short, and the material prepared at normal temperature and pressure has excellent hydrogen production performance for formaldehyde oxidation.

The invention discloses a preparation method and application of a nickel-aluminum quantum dot modified polyacid seawater electrolysis electrocatalyst, and relates to the technical field of electrocatalysts. The invention discloses a preparation method of a nickel-aluminum quantum dot modified polyacid electrolytic seawater electrocatalyst. The preparation method comprises the following steps: weighing raw materials for preparing an electrolyte solution; comprising aluminum salt, nickel salt, polyacid and sodium citrate. Uniformly mixing the raw materials with deionized water, and then adjusting the pH value to 9.5 to obtain a target electrolyte solution; a metal net substrate is used as a working electrode, a saturated calomel electrode is used as a reference electrode, and a graphite electrode is used as an auxiliary electrode; the nickel-aluminum quantum dot modified polyacid electrolysis seawater electrocatalyst is prepared by electrodeposition on a metal net substrate by adopting a cyclic voltammetry electrodeposition method. According to the prepared electrocatalyst, the cost can be reduced, the reaction kinetics of an alkaline solution and alkaline seawater can be improved, the overpotential can be reduced, the stability can be improved, and the alkaline seawater electrolysis process is more economical and efficient.

The invention discloses a potentiometric titration detection method for a silver element in an antibacterial medical titanium-based silver alloy, which comprises the following steps: dissolving a titanium-based silver alloy sample by hydrofluoric acid and nitric acid, adding hydrochloric acid to convert silver ions into silver chloride precipitates, adding a saturated boric acid solution to complex fluorine ions in the solution, and carrying out tilting filtration on supernatant by using medium-speed filter paper to obtain the silver element in the antibacterial medical titanium-based silver alloy. After washing for multiple times, filtering and collecting precipitates, dissolving the precipitates by dropwise adding ammonia water for multiple times, titrating with a potassium iodide standard titration solution by taking a silver-potassium iodide silver electrode as an indicator electrode and a saturated calomel electrode as a reference electrode in an ammoniacal medium, and indicating an end point by adopting a potentiometric method. According to the method, the to-be-detected element silver is separated by adopting a dissolution-precipitation-separation method, the saturated boric acid is added to avoid corrosion of fluorine ions in the solution to glassware and electrodes, and the method is reliable, high in precision and accuracy and suitable for accurate detection of the silver element in the common antibacterial medical titanium-based silver alloy in the field of biological medicine.

The present invention discloses a core-shell structured high-entropy alloy fiber material, its preparation method and application, belonging to the technical field of alloy material preparation. The method includes: dissolving a buffer in deionized water to obtain solution A, heating it and sequentially adding a complexing agent, an additional salt, a reducing agent and a soluble metal salt, stirring and dissolving to obtain solution B, then adjusting the pH of solution B, and standing at room temperature to obtain an electrolyte; ultrasonically cleaning, rinsing and drying the conductive fiber with acetone, ethanol and deionized water respectively; using a saturated calomel electrode as a reference electrode, the conductive fiber as a working electrode, and a carbon electrode rod as a counter electrode, immersing the three electrodes in the electrolyte, and using a potentiostatic electrodeposition method to perform electrodeposition on the surface of the conductive fiber to obtain a high-entropy alloy fiber. The present invention realizes the uniform electrodeposition of the high-entropy alloy on the fiber surface and obtains a high-entropy alloy fiber material with excellent conductivity.