42 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 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 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 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 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 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 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 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.

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 impurity removal and purification method comprises the following steps: (1) removing iron and aluminum step by step: controlling the temperature of the leachate to be 45-50 DEG C, adjusting the pH value to be less than or equal to 3, and taking a saturated calomel electrode as a reference and an oxidation-reduction potential gt; the voltage is 400 mV; (2) extraction and reverse extraction: under the condition that the pH value of the leachate is 3.5-4.0, extracting Mn < 2 + > in the leachate by using an extracting agent P204 with the volume concentration of 20-30% and the saponification rate of 60-70%; (3) membrane separation and deep purification: firstly removing Ca < 2 + > and Mg < 2 + > from the manganese-rich liquid through carboxylic acid type chelating resin, and then filtering SO4 < 2-> by using a nanofiltration membrane; the method is high in heavy metal ion removal rate and low in cost, and avoids the risk of vulcanizing agent residue.

The invention provides a cesium-containing wastewater treatment method and an electrochemical deposition film preparation method and system, and relates to the field of cesium-containing wastewater treatment. The cesium-containing wastewater treatment method comprises the following steps: S1, preparing a CuHCF ink film; s2, a three-electrode system is constructed, specifically, the CuHCF ink film serves as a working electrode, a platinum sheet serves as a counter electrode, a saturated calomel electrode serves as a reference electrode, and the three-electrode system is formed; s3, the cesium-containing wastewater is input into equipment provided with a three-electrode system, and the three-electrode system works to remove cesium in the cesium-containing wastewater. According to the cesium-containing wastewater treatment method and the electrochemical deposition film preparation method and system, efficient and reversible cesium ion capture is achieved through the synergistic effect of ion exchange and electrochemical driving. The method has the advantages of high selectivity, rapid dynamics, environmental friendliness and flexible adaptation capability, and a sustainable solution is provided for radioactive wastewater treatment.

The invention belongs to the technical field of flow batteries, and particularly relates to a high-performance carbon felt electrode for a zinc-bromine flow battery and a preparation method of the high-performance carbon felt electrode. Comprising the following steps: respectively dissolving zinc salt and dimethylimidazole in methanol, carrying out stirring ultrasonic treatment to respectively obtain a solution A and a solution B, mixing the solution A and the solution B, and continuously stirring to obtain a solution C; washing and drying the original carbon felt, dipping the original carbon felt in the solution C, continuously stirring, washing and drying to obtain ZGF; the ZGF is carbonized in the argon atmosphere, and Z-ONGF is obtained; a three-electrode system is assembled by taking Z-ONGF as a working electrode, an original carbon felt as a counter electrode and a calomel saturation electrode as a reference electrode, electro-deposition is performed in an electroplating solution containing InCl34H2O and KBr, and the high-performance carbon felt electrode is obtained after cleaning and drying. According to the invention, the generation of zinc dendrites in the zinc-bromine flow battery can be effectively inhibited, and the electrochemical activity can be improved.

The preparation method comprises the following steps: taking foamed nickel as a working electrode, a platinum sheet as a counter electrode and a saturated calomel electrode as a reference electrode, and growing a Co (OH) 2 nanosheet in situ by adopting a constant potential deposition method to obtain a Co (OH) 2 / NF composite material; the preparation method comprises the following steps: dissolving Co (NO3) 2.6 H2O, FeCl3. 6H2O and an organic ligand in DMF (Dimethyl Formamide), stirring to form a homogeneous solution, immersing the Co (OH) 2 / NF composite material into the homogeneous solution, carrying out solvothermal reaction, natural cooling and vacuum drying under the conditions of heating and heat preservation, and carrying out gas-phase phosphating treatment on the obtained CoFe-MOF / NF precursor to obtain the CoFe bimetallic phosphide which has hydrogen evolution and oxygen evolution properties as a large-current alkaline full-electrolysis water electrode. The symmetrical electrolytic cell assembled as a cathode and an anode can realize high stability of large-current alkaline complete water splitting.

The invention provides a coordination regulation and control type high-stability aqueous organic flow battery adaptive to thermal power energy storage frequency modulation and a preparation method of the coordination regulation and control type high-stability aqueous organic flow battery. The preparation method comprises the following steps: adding deoxidized deionized water into an organic anode active material and an anode coordination regulator, introducing inert gas, carrying out stirring treatment, adding a pH regulator to regulate the pH value of the solution, and carrying out stirring treatment to form an anode electrolyte; adding deoxidized deionized water into an organic cathode active material and a cathode coordination regulator, introducing inert gas, stirring, adding supporting electrolyte, and stirring to form cathode electrolyte; immersing an ion exchange membrane into the modification liquid, and stirring to obtain a modified membrane; soaking the modified membrane in an alkali metal solution to activate ion exchange sites; the method comprises the following steps: immersing an electrode into a doping solution for dispersion treatment, drying to obtain a doped electrode, and carrying out cyclic voltammetry activation in an H2SO4 solution by taking the doped electrode as a working electrode, a platinum sheet as a counter electrode and a saturated calomel electrode as a reference electrode.

The invention discloses a boron-doped diamond electrode with high oxygen evolution potential, which is characterized in that monocrystalline silicon is pretreated by using diamond grinding liquid, the obtained monocrystalline silicon after seed crystal is used as a substrate, and the boron-doped diamond electrode is prepared by using a hot filament chemical vapor deposition method; carrying out oxidation treatment on the boron-doped diamond electrode by utilizing an electrochemical workstation and adopting a chronoamperometry: carrying out oxidation treatment for 10-60 minutes in an acidic electrolyte under the treatment voltage of 2.5-8.5 V by taking a platinum sheet electrode as a counter electrode and a saturated calomel electrode as a reference electrode, so as to obtain the boron-doped diamond electrode with high oxygen evolution potential, according to the invention, the oxygen evolution potential of the boron-doped diamond electrode can be increased, so that the ozone electric synthesis efficiency of the boron-doped diamond electrode is effectively improved.

This invention discloses an electrochemical flexible sensor capable of simultaneously detecting glucose and ethanol. It involves introducing a zinc oxide nanowire array and palladium nanoparticles onto the surface of carbon cloth to obtain a CC / ZnO / Pd modified electrode. A three-electrode system is then formed, using the CC / ZnO / Pd modified electrode as the working electrode, a saturated calomel electrode as the reference electrode, and a platinum wire as the counter electrode. This system can simultaneously detect the glucose and ethanol content of a sample, with detection ranges of 1×10⁻⁶ for glucose and ethanol, respectively. ‑6 -1×10 ‑1 mol / L and 1×10 ‑7 -1×10 ‑2 The detection limits were 5.20 × 10 mol / L. ‑7 mol / L ( S / N =3), 1.17×10 ‑8 mol / L ( S / N =3). It is not only simple to operate, efficient, and low in cost, but also has a lower detection limit and a wider linear range, which can accurately distinguish between alcoholic hypoglycemia and intoxication, avoiding misdiagnosis and mistreatment.

The application discloses a method for synthesizing a Pt-based nano high-entropy alloy on a carrier, wherein precursor platinum salt, precursor bismuth salt, precursor cobalt salt, precursor copper salt and precursor nickel salt are dissolved in a mixed solution of DMF and acetonitrile to obtain a precursor solution; the precursor solution is stirred to be completely dissolved; an electrochemical deposition is performed by adopting a three-electrode system, a saturated mercury electrode is used as a reference electrode, a platinum mesh electrode is used as a counter electrode, and a clamped sheet electrode is used as a working electrode; carbon cloth is pretreated to remove impurities on the surface, the carbon cloth is respectively subjected to ultrasonic treatment in a acetone solution and deionized water for 30 min, and is dried at room temperature; the treated carbon cloth is clamped on the clamped sheet electrode, and a 1*1 cm part is reserved as a carrier of the nano high-entropy alloy; the electrode is immersed in the precursor solution, only the 1*1 cm part of the carbon cloth of the working electrode is immersed in the precursor solution, the range of a constant potential is between-0.4 V and-0.5 V, and the deposition time is 1200-1800 s, so that a platinum-based high-entropy alloy loaded on the carbon cloth is obtained.

The invention discloses a preparation method of a functionalized MOF-based sensor and application of the functionalized MOF-based sensor in detection of lithium content in brine, and belongs to the field of electrochemical sensors. Comprising a working electrode, a reference electrode and a counter electrode, the working electrode is a composite electrode of which the surface is modified with a FePO4-coated HSO3-UiO-66 coating, the reference electrode is a saturated calomel electrode, and the counter electrode is a composite electrode of which the surface is modified with a LiFePO4-coated ZIF-8 coating. When the sensor is applied to detection of the lithium element in the oil field brine, the sensor prepared by the invention has the advantages of high measurement accuracy, high selectivity, high stability, high detection speed, low cost and the like.

The application discloses a kind of polybenzodifuranone and its constant potential polymerization preparation method, belong to organic conductive polymer material preparation technical field, benzodifuranone (BFDO) and supporting electrolyte are dissolved in polar aprotic solvent, and electrolyte is obtained by mixing uniformly;With platinum metal electrode as working electrode and counter electrode, with saturated calomel electrode as reference electrode, three electrodes are connected with direct current power supply and are placed in the electrolyte, in air atmosphere, electrochemical polymerization reaction is carried out using constant potential method;After reaction, the reaction liquid is extracted and filtered, dried, to obtain polybenzodifuranone (PBFDO).The application uses constant potential electrochemical polymerization method, n-type conductive polymer polybenzodifuranone can be synthesized in air atmosphere in one step, without catalyst, high-temperature anaerobic environment and complex post-processing, the product conductivity is 1.157-18.28 S / cm.Process simplification, low cost, process controllable, can realize green scale preparation and industrialization application.

An electrochemical sensitive electrode for detecting nitrite, a preparation method and its application belong to the field of electrochemical sensing technology. First, a carbon cloth is soaked in a strong acid mixed solution for a certain period of time for pretreatment and then cleaned; secondly, a copper source, a cerium source and a sodium salt are dissolved in deionized water in a certain proportion to serve as an electroplating solution; then the pretreated carbon cloth is used as a working electrode, a platinum sheet is used as a counter electrode, and a saturated calomel electrode is used as a reference electrode, and cyclic voltammetry is used for electroplating to obtain a carbon cloth-loaded cerium ion (III)-doped copper nanoparticle sensitive electrode; and the electrode is used as a working electrode for electrochemical detection of nitrite ions. The sensitive electrode prepared by the present invention has good sensitivity to nitrite ions within a certain concentration range, can realize sensitive, accurate and rapid detection of nitrite ions, and has a low detection limit, a wide linear range, high sensitivity and excellent stability and repeatability.

The application discloses a preparation method of a p-n homojunction cuprous oxide (Cu2O) glucose photoelectrochemical sensing electrode. In the photoelectrochemical three-electrode system, the working electrode is composed of a 1cm*3cm ITO substrate, the counter electrode is a platinum sheet electrode, and the saturated calomel electrode (SCE) is the reference electrode. Before use, all the ITO substrates are cleaned in acetone for 20 minutes, cleaned in ethanol for 20 minutes, and cleaned in deionized water for 20 minutes. The cuprous oxide (Cu2O) p-n homojunction film is deposited by using an aqueous solution containing 0.1M copper sulfate (CuSO4.5H2O) and 1.4M sodium lactate (C3H5O3Na) as a synthesis agent, the deposition solution is adjusted to pH=11 by NaOH, the potential of the solution relative to the SCE is set to-0.4V by using an electrochemical workstation, the deposition time is 1800s, the reaction deposition temperature is 30 DEG C, and thus the p-n homojunction cuprous oxide (Cu2O) glucose photoelectrochemical sensing electrode is obtained. 2+ The p-n homojunction cuprous oxide (Cu2O) glucose photoelectrochemical sensing electrode used in the application retains the high selectivity and high resistance to reduction of the p-type material as a photo-cathode electrode, and meanwhile, the p-n junction is modified by self-doping to improve the photoelectrochemical response of the electrode and enhance the signal strength. The application has the advantages of simple operation, safe and reliable reaction, low requirement on equipment, low cost of raw materials, and wide application.

The application belongs to the technical field of electrocatalytic material synthesis, and discloses a chlorinated hematin embedded manganese-iron oxide electrode and a preparation method and application thereof. A sodium sulfate solution is used as a supporting electrolyte, manganese sulfate, ferrous sulfate and chlorinated hematin are added to prepare an electroplating solution, a graphite matrix is immersed in the electroplating solution as a working electrode, a titanium sheet is used as a counter electrode, and a saturated calomel electrode is used as a reference electrode to construct a three-electrode system. A continuous cyclic voltammetry method is used, and manganese-iron oxide is deposited on the surface of the matrix through multiple cathode deposition and anode oxidation. In the continuous circulation process, chlorinated hematin is also adsorbed and embedded in the manganese-iron oxide to obtain a chlorinated hematin embedded manganese-iron oxide electrode. The method can realize the compounding of metal oxides and complexes, and the activation of the material in the circulation process. The obtained electrode has good biocompatibility and stability, and can be used to catalyze the oxidation of ascorbic acid under neutral conditions to promote hydrogen production.