49 results about "Electrochemical engineering" patented technology

The invention relates to a nanocrystal metal oxide composite electrode and a method for preparing the same. The electrode is suitable for a seawater electrolysis device for preventing the contamination of sea creature and used for electrolytic production of sodium hypochlorite, cathode protection and other electrochemical engineering; a main structure of the electrode comprises a substrate, an anticorrosive antipassivated middle layer and a surface activity layer, wherein the substrate is metal titanium; the purity of the metal titanium is over 99 percent; the middle layer is iridium-tantalum or iridium-tantalum-tin oxide; the surface activity layer is ruthenium-iridium-tin metal oxide; a process for preparing the electrode adopts a sol-gel method and comprises three process steps of the pretreatment of the substrate, the preparation of the anticorrosive antipassivated middle layer and the preparation of the surface activity layer; and the electrode has the characteristics of even compositions, difficulty for burning loss, fine crystal grains, simple preparation process, controllable process and the like.

The invention provides a titanium-based oxide acid resistant anode and a preparation method thereof, and specifically to an electrode catalyst used in the process of electrolysis and a preparation method thereof, belonging to the technical field of electrochemical engineering. The invention is characterized in that: the titanium-based oxide acid resistant anode is especially applicable to electrolysis with oxygen evolution and organic electrolysis and has a long life in a sulfuric acid solution; the anode comprises an electrode matrix, an intermediate transition layer and an active coating; the preparation method for the anode comprises the steps of preparing Ti/Tio2NT by electrochemical anodization in ionic liquid and forming Ti/TiO2NT/C+N+B by co-cementation of B, C and N under the catalytic cementation of rare earth at first or preparing Ti/ C+N+B through surface alloying of titanium matrix and forming Ti/ C+N+B/TiO2NT through anodization heat treatment at first, applying the graphite fiber loaded intermediate transition layer of Sn, Sb, rare earth and like next, and preparing the PbO2 or MnO2 active coating at last. The titanium-based oxide acid resistant anode prepared through the preparation method provided in the invention has a service life more than 160 hours.

The invention belongs to the electrochemical engineering and industrial fields, particularly to a lead liquid flow battery. The single battery cell consists of a deposition-type lead dioxide anode, a deposition-type lead dioxide cathode and an electrolyte containing soluble lead salt. A galvanic pile can be formed by a plurality of battery cells being connected serially or in parallel. The electrolyte of the galvanic pile is stored in a storage tank and the electrolyte pushed by a liquid pump keeps flowing between the storage tank and the pile pipes in the process of charging and discharging. The lead in the electrolyte is deposited on current collectors of the positive electrode and the negative electrode to become the lead dioxide and metallic lead when the battery is charged. And the lead dioxide and metallic lead dissolve in the electrolyte to become lead ions when the battery is discharged. The liquid flow battery is characterized by simple manufacture, low cost and long cycle life.

The invention relates to an acid-proof anode which belongs to the electrochemical engineering technical field and in particular relates to electrode catalyst which is used in the electrolysis process and a method for preparing the electrode catalyst. The acid-proof anode is characterized in that the acid-proof anode is composed of a titanium substrate, an interlayer of solid solution and an activated layer, the anode is the acid-proof anode which co-diffuses one or two or three of B, C and N to the titanium substrate under the condition of rare-earth catalysis, simultaneously, the invention provides anode material which has long service life, good electro-catalytic activity, good wear resistance and good corrosion resistance in sulfuric acid solution, and the anode material is in particular suitable in electrolysis production which has oxygen evolution and organic electrolysis process.

The invention belongs to the field of electrochemistry engineering and industry, and particularly to a niobium carbide and tantalum carbide electrode preparation method, wherein a plate, a sheet, foil or a wire of metal niobium or tantalum is adopted, and is subjected to a reaction with carbon, carbon monoxide, an epoxy resin and the like in the protection of gas with a temperature of 600-1200 DEG C so as to obtain a compact niobium carbide and tantalum carbide layer on the outer surface of niobium and tantalum, wherein the internal is the metals such as niobium and tantalum, and the obtained material has the advantages of flexibility, strength and the like of the metal, has the electric conduction niobium carbide and tantalum carbide layer adopted as the strong corrosion resistance layer, and can be used as a dimensionally stable anode used in sulfuric acid, hydrochloric acid, chlor-alkali electrolysis and other electrolytes. The preparation method has advantages of less operation steps, simple process and stable quality, and is especially suitable for preparation of redox flow batteries, secondary batteries, and electrolysis industry electrodes.

The invention discloses an electrochemically modified graphite electrode, which consists of a graphite body and an active layer, wherein the active layer is attached to the surface of the graphite body. The electrochemically modified graphite electrode is characterized in that: the active layer (2) is a product directly obtained in a way that the graphite body (1) is subjected to circular treatment between electrochemical oxidation and electrochemical reduction in water-based electrolyte solution with ionic conductivity. The electrochemically modified graphite electrode is used as an electrode material of an electrochemical capacitor, has high energy, high power density and high-speed charge and discharge performances, also has the advantages of high electric conductivity, low material cost, high stability, long service life, simple manufacture, low production cost and the like. In addition, the electrochemically modified graphite electrode of the invention can be widely applied to applicable electrochemical engineering and serves as the electrode material.

The invention relates to a direct compounding method of a metal lithium electrode and an inorganic solid electrolyte ceramic diaphragm, and belongs to the field of electrochemical engineering and ceramic industry. According to the method, the surface tension of the lithium liquid is reduced by increasing the melting temperature; through a friction mode, meanwhile, an oxide layer on the surface ofthe lithium liquid and air pits formed in the micro surface of the ceramic diaphragm due to unevenness are destroyed. Fresh lithium liquid makes direct contact with the ceramic diaphragm body and theninfiltrates and spreads, and the problems that in a conventional method, the lithium liquid is difficult to infiltrate on the surface of the ceramic diaphragm, the solid/solid interface contact resistance of the metal lithium electrode and the inorganic solid electrolyte ceramic diaphragm is large, and the stability is poor are solved. According to the method, the direct compounding of the metallithium electrode and the inorganic solid electrolyte ceramic diaphragm is realized without depositing a transition infiltration layer on the surface of the ceramic diaphragm in advance in manners ofatomic deposition and the like, the process flow is simple, and the method is particularly suitable for a solid-state battery system taking metal lithium as a negative electrode and taking oxide inorganic solid electrolyte ceramic as a diaphragm.

The invention relates to an on-site verification apparatus for an optical fiber current sensor, a usage method of the on-site verification apparatus and application of the on-site verification apparatus. The on-site verification apparatus for the optical fiber current sensor includes an optical fiber current detection sensing module and an optical fiber current detection processing and display module. The optical fiber current detection sensing module is composed of a light source, a linear polariscope, a polarization separator, a modulator, a transmission optical fiber, a 1/4 wavelength filter, an optical fiber sensing head, a reflector and a photoelectric detector. Proceeding from installation and debugging of the optical fiber current detection sensing module, the optical fiber current sensor on-site verification apparatus has reasonable control steps, is easy to operate, and can carry out efficient, economic and accurate error detection and quantity transmission on a DC heavy current sensor working on site for a long time; the optical fiber current sensor on-site verification apparatus is suitable for detecting and verifying a current detection sensor working on site for a long time in fields of electrolytic aluminum, electrolytic copper, electric smelting, electroplate and other electrochemical engineering; the on-site verification apparatus for the optical fiber current sensor is good in safety performance, large in measuring dynamic scope, high in frequency response degree, small in size and light in weight; and by adopting the on-site verification apparatus for the optical fiber current sensor, the measuring precision of a current detection apparatus can be raised, and needs of safety and stabilization of a power supply system are met.

The invention relates to the electrochemical engineering and industrial fields, particularly to a lead liquid flow battery electrolyte comprising the basic components of fluoboric acid and an aqueous solution of soluble divalent lead. The concentration of fluorboric acid is 0.5-3 mole per liter and the concentration of divalent lead is 0.2-1.5 mole per liter. Some cations such as cadmium, manganese, cobalt, etc, can be added as cation additives, and some anions such as sulfate radical, chlorate radical, perchlorate radical, etc, can be added as anion additives. The rate of disposition and dissolution of lead dioxide and mental lead is very high in the fluorboric acid aqueous solution of the lead fluoborate. The electrode overpotential can be reduced and the rate of electrodes can be improved by adding cation and annion additives in the electrolyte. The electrolyte can be directly used as a liquid flow battery with deposition type lead dioxide as an anode, having advantages of high conductivity, long cycle life, low cost and stable quality.

The present invention relates to compound containing morpholine cation radical and its synthesis and use. The compound of the present invention is one excellent green solvent with dissolving capacity higher than organic solvent, has low production cost, simple synthesis path and high yield, and is suitable for industrial production. The compound of the present invention is used as ionic liquid and may be used as gas absorbent and liquid extractant in separation engineering, as reaction medium and catalyst in chemical reaction, as electrolyte in electrochemical engineering, etc.

The invention belongs to the technical field of electrochemical engineering and relates to a method for preparing an ion conductivity membrane for a flow battery through electrostatic spinning. In a high-voltage electric field, a carbon nanotube-doped non-fluorinated cation exchange polymer is dispersed into a spinning solution of an N,N-dimethyl formamide or N,N-dimethyl acetamide solvent; the spinning solution forms electrospun nanofiber on a receiving plate through the electrostatic force traction of a spinning nozzle to obtain the electrospun nanofiber with a three-dimensional network structure; and then solvent steam bath, hot pressing and protonation are carried out to prepare a compact membrane with ionic conductivity for the flow battery. Ions are conducted along the axial direction of the fiber to form a long-range ordered conducting channel; penetration of vanadium ions through a hydrophilic channel is significantly reduced through excellent ion barrier property of a carbon nanotube; and the electrospun membrane has relatively high mechanical strength and swelling resistance through fibration, therefore, the membrane disclosed by the invention obtains relatively high charge-discharge property of an all-vanadium flow battery.

The invention belongs to the field of preparing electrodes for electrochemical engineering, and more specifically, relates to a coated titanium anode and a spraying pyrolysis preparation method thereof. The method includes following steps: (1), coating the surface of a titanium plate after being pretreated with an antioxidation layer; (2), controlling temperature of the titanium plate to 250-300 DEG C, and atomizing and spraying electrode preparation raw material slurry onto the surface of the antioxidation layer of the titanium plate; (3), sintering the titanium plate at high temperature to obtain the coated titanium anode. The coated titanium anode is prepared by combining spraying technology with step-by-step thermal treatment, so that the technical defect of short service life of electrodes caused by the fact that coatings are prone to dry-cracking when being baked at high temperature in a brush-coating method in the prior art is overcome ingeniously; quick and accurate preparationof the coated titanium anode is realized, preparation cost is low, and product quality is controllable. On the premise that performance is ensured, coating amount of precious metal is lowered greatly, cost of the coated titanium plate is lowered remarkably, and expansion and parity of applying the coated titanium anode are facilitated.

The invention relates to a solid-state chemical current source and to a method for increasing a discharge power thereof. The inventive current source can be used in electrochemical engineering, in particular for primary and secondary solid-state chemical power sources, which are based on solid ion conductors and exhibit a high discharge power and for a method for increasing the said discharge power. The solid-state chemical current source comprises a body provided with current leading-out wires and solid-state galvanic cells which are arranged therein, are connected to the current leading-out wires, are based on solid ion conductors and perform the function of heating elements. A heat insulation for reducing heat losses of the heated galvanic cells is arranged inside and\or outside the body. The inventive method for increasing the discharge power of the solid-state chemical current source by heating it consists in using the heat produced by the electric current flowing through the galvanic cells and in maintaining the hot state of the said galvanic cells during the discharge. The said invention makes it possible to obtain a solid-state chemical current source exhibiting a high discharge power, a low self-discharge (about 1-3% per year), a long-term power storage and to increase energy characteristics in such a way that they are equal to or greater than 600 Watt-hour/dm3.

The invention belongs to the technical field of electrochemical engineering, and relates to a method of one-step hydrogenation esterification between ketone and carboxylic acid in an electrochemical hydrogen pump reactor. In an electrochemical hydrogen pump reactor, when electrical power is applied, an electrochemical window with extremely low hydrogen is utilized to dissociate hydrogen in the anode, then hydrogen is delivered to the catalysis layer of the cathode to generate in-situ adsorption hydrogen, in-situ adsorption hydrogen and ketone in the cathode circulation liquid carry out hydrogenation reactions directly, the generated alcohols further carry out esterification reactions with carboxylic acids in the cathode circulation liquid; hydrogenation and esterification are carried out in one reactor under a normal pressure, and a synergistic effect is generated.

The invention belongs to the technical field of electrochemical engineering, and relates to a H2/CO2 separation and CO2 hydrogenation self-coupling method. In an electrochemical hydrogen pump, H2/CO2mixed gas is fed from an anode, anode outlet gas is introduced into a cathode to serve as a raw material, and cathode CO2 hydrogenation is achieved. When electric energy is externally added at normaltemperature and normal pressure, high selectivity and controllable dissociation of the hydrogen at the anode are realized by utilizing an extremely low electrochemical window of hydrogen, and generated hydrogen protons are transferred to a cathode catalyst layer to generate in-situ adsorption hydrogen to participate in cathode CO2 hydrogenation. CO2 in the anode outlet mixed gas is enriched through hydrogen transmembrane transmission and is directly used as cathode feed, so that cathode CO2 catalytic hydrogenation is realized. According to the invention, hydrogen separation and CO2 hydrogenation of the same strand of H2/CO2 feed gas are synchronously carried out in the same reactor, and synergistic interaction is realized, so that the process and the device are simplified, and the utilization rate of the H2/CO2 feed gas is improved.

The invention belongs to the field of electrochemistry, particularly relates to a method and device for real-time synchronous tracking of hydrogen evolution amount and electrochemical testing, and provides a method for synchronous tracking of hydrogen evolution amount and electrochemical testing and a device used in the method. The method can achieve real-time tracking. Firstly, two cameras are added on the basis of generating hydrogen through measuring electrode reaction, real-time camera shooting recording is carried out on the hydrogen evolution amount and the corrosion situation of the electrode surface, and a relationship between potential current change and the hydrogen evolution amount can be obtained at any time in an experiment by combing an electrochemical on-line monitoring system.

The invention relates to a modeling method for a kinetic mass transfer model of a CO2 electrochemical hydrogenation reactor, and belongs to the technical field of electrochemical engineering. The method comprises the following steps: S1, establishing an electrode kinetic model for generating formic acid, CO and a cathode hydrogen evolution side reaction through CO2 electro-catalysis; S2, optimizing and solving model parameters of electrode dynamics, wherein an optimized objective function is a minimum value of residual sum of squares of current densities of formic acid, carbon monoxide and hydrogen calculated by the model and an experimental result; S3, using a nonlinear optimization function in MATLAB for solving the model parameters; and S4, establishing a mass transfer coupling electrode kinetic model for the CO2 electrochemical hydrogenation reactor, discretizing a control equation of the gas mass transfer model by adopting a finite difference method, and realizing coupling calculation of cathode dynamics and a mass transfer equation by calculating overpotential distribution of each product of the cathode. The method is good in universality and has guiding significance for design of similar reactors.