15 results about "Constant current density" patented technology

This invention provides a method for preparing (002) crystal-plane oriented metallic zinc and its application. The invention employs a two-electrode electrochemical deposition technique, using iron foil, titanium foil, or copper foil as the working electrode, commercial zinc foil as the counter electrode, and an aqueous zinc salt solution as the electrolyte. Constant current density discharge deposition is used to deposit (002) crystal-plane oriented metallic zinc on the working electrode; the constant current density is 50 mA cm⁻¹. ‑2 ~200 mA cm ‑2 The (002) crystal-plane oriented metallic zinc prepared by this invention can be used in rechargeable zinc-ion batteries. The two-electrode electrolytic cell device used in the preparation of metallic zinc in this invention is simple, the preparation process is straightforward, and the preparation method is more universal. The (002) crystal-plane oriented metallic zinc prepared according to the method of this invention can suppress zinc dendrite growth and hydrogen evolution, thereby improving the service life of rechargeable zinc-ion batteries.

A method of anodizing an aluminum alloy, comprising the steps of: providing an anodizing bath containing tert-butoxide, primarily oxalic acid; aging the anodic oxidation bath to condense the metal alkoxide to form metal oxide particles and an acid ester; heating the bath to 40 DEG C to 80 DEG C; stirring the bath at a speed of 200 to 700 rpm (revolutions per minute); immersing the workpiece in a bath and anodizing at a constant current density of 1 A / dm2 to 4 A / dm2 for 1 to 20 minutes or until the bath voltage reaches a threshold value of 100 to 200 V; the workpiece is then anodized at a constant voltage for 20 minutes to 200 minutes to produce an anodized surface having a thickness of 5 microns to 100 microns, the anodized surface comprising an optically discontinuous pore structure that produces a white or near-white appearance.

This invention relates to the field of battery separator materials technology, specifically to MXene-functionalized aramid paper-based battery separators, their preparation methods, and applications. Meta-aramid paper is prepared by wet papermaking using short-cut meta-aramid fibers and precipitated fibers. MXene nanosheets are prepared by hydrofluoric acid etching. Using the meta-aramid paper as a substrate, a functional coating is constructed on the surface of the aramid paper by loading a mixture of para-aramid nanofibers and MXene through a vacuum-assisted filtration-layer-by-layer self-assembly method. The resulting functionalized separator is obtained through protonation reduction. The separator, with its three-dimensional porous protective layer constructed from para-aramid nanofibers and MXene, combines physical barrier and chemical bonding, effectively inhibiting polysulfide shuttle. Furthermore, the highly active sites of MXene can activate inert sulfur-containing substances, improving sulfur utilization. When used in assembling lithium-sulfur batteries, the separator achieves an initial discharge capacity of 1244 mAh·g at a constant current density. ‑1 The capacity retention rate is 82% after 200 cycles.

The application relates to the technical field of ammonium oxidation, and discloses an anode material for ammonium oxidation under a low-concentration chloride ion condition and a preparation method thereof.The anode material takes manganese dioxide as a carrier and is loaded with monatomic silver, and the loading amount of the monatomic silver is less than 0.1 wt%.In the preparation process, first, constant current density electrodeposition is carried out to prepare a MnO2 / platinum-coated titanium mesh; then, a wet chemical immersion method is used to load Ag on the MnO2 substrate; finally, high-temperature air atmosphere calcination is carried out to prepare a monatomic Ag / MnO2 anode material.The application utilizes the acid resistance of MnO2 itself and the strong metal carrier interaction between metal Ag and MnO2 to realize stable and continuous electrolysis operation; and Ag and MnO2 realize the enrichment of low-concentration chloride ions at the anode interface through chemical affinity and physical adsorption, thereby realizing the efficient generation of active chlorine under the condition of low-concentration chloride ions.

The invention belongs to the technical field of organic synthesis, and particularly relates to a method for synthesizing a bridged ring derivative through [4 + 2] cycloaddition based on an electrochemical means. The method for synthesizing the bridged ring derivative based on the electrochemical means [4 + 2] cycloaddition comprises the following steps: by taking an anethole derivative 1 and a cyclopentadiene derivative 2 as raw materials, tetrabutylammonium hexafluorophosphate or tetrabutylammonium perchlorate as an electrolyte and an acetonitrile solution as a solvent, carrying out electrolysis in an electrolytic tank at constant current density, and purifying to obtain a bridged ring derivative 3. According to the method, the free radical cation intermediate is generated through anodic oxidation by utilizing constant-current electrolysis under the conditions of no metal and no oxidant, the cycloaddition reaction is realized, the reaction condition is mild, the reaction time is short, the yield is 51-81%, the stereoselectivity is good, and the method is suitable for complex molecule synthesis.

A de-powdered waste battery electrode sheet and its preparation method are disclosed. The preparation method includes: providing a cathode plate, an anode plate, and an electrolyte; the cathode plate comprises a waste battery electrode sheet, the anode plate comprises boron-doped diamond, and the electrolyte comprises a supporting electrolyte, a halide salt, and a pH buffer; immersing the cathode plate and anode plate in the electrolyte and electrically connecting them to carry out an electrochemical reaction; the electrode spacing between the cathode plate and anode plate is 1 mm-10 mm, and the constant current density is 20 mA / cm². 2 -80 mA / cm 2 The de-powdered waste battery electrode sheets are collected from the cathode plate after the electrochemical reaction. The preparation method of this application enables effective separation between the original active material and the current collector in the obtained de-powdered waste battery electrode sheets, with less residual binder on the surface of the current collector and good mechanical properties maintained.

The application relates to a semiconductor electrochemical gold etching solution and an etching method thereof. The electrochemical gold etching solution is composed of inorganic acid, metal salt, halide, surfactant, decontaminant, defoaming agent and the like, semiconductor wafer anodes and cathodes are immersed in the electrochemical gold etching solution, and the electrochemical single-element gold etching is carried out under a constant current density. By adjusting the composition, pH value, content of the electrochemical gold etching solution and etching conditions, the excellent effects of fast etching rate of the single-element gold on the semiconductor wafer, controllable etching thickness, uniform surface and the like are realized.

The invention provides a sewage advanced treatment method based on a Magneli phase Ti4O7 reactive electrochemical membrane, which comprises the following steps: taking secondary effluent of a municipal sewage treatment plant as a sewage source, pre-filtering, and injecting the sewage into an open type electrochemical reactor; arranging a Magneli-phase Ti4O7 reactive electrochemical membrane at the center of the electrochemical reactor as an anode, arranging a stainless steel mesh at the outer side of the anode as a cathode, and respectively connecting the anode and the cathode to a positive electrode and a negative electrode of a direct-current stabilized power supply; and pumping out the sewage in the electrochemical reactor at a set flow rate and re-injecting the sewage to form a cross-flow circulating mode, applying constant current density to carry out electrochemical oxidation reaction, and taking the effluent after circulating treatment as the advanced treatment effluent. Compared with the prior art, the current efficiency is high, the ARGs removal capacity is high, the antibiotic degradation performance is excellent, secondary pollution is avoided, and an efficient and low-cost solution is provided for advanced sewage treatment.

The application provides a copper-nickel alloy catalytic electrode and a preparation method and application thereof. The copper-nickel alloy catalytic electrode comprises a nickel foam substrate and a copper-nickel alloy vertically loaded on the surface of the nickel foam substrate, the molecular formula of the copper-nickel alloy is Cu 0.81 Ni 0.19 , and the copper-nickel alloy is a nanostructure with a dendritic morphology. The preparation method comprises the following steps: adding copper sulfate, nickel sulfate and ammonium sulfate into water, stirring uniformly to obtain an electrolyte; taking the nickel foam substrate as a working electrode, a saturated silver-silver chloride electrode as a reference electrode, a platinum sheet or a graphite rod electrode as a counter electrode, applying a constant current density to the working electrode to obtain a preset electrode; alternately cleaning the preset electrode with ethanol and distilled water, and vacuum drying to obtain the copper-nickel alloy catalytic electrode. The copper-nickel alloy catalytic electrode prepared by the application has a dendritic morphology, rich active sites and a high specific surface area, and has excellent catalytic activity and stability in the hydrogen production by the electro-catalytic coupling hydrogen evolution reaction of cyclohexanone synthesis adipic acid.

The invention relates to a method for producing an alkali metal alcoholate solution L1 in an electrolysis cell E which comprises at least one cathode chamber KK, at least one anode chamber KA, and at least one central chamber KM lying therebetween. The interior IKK of the cathode chamber KK is separated from the interior IKM of the central chamber KM by a separating wall W comprising at least one alkali-cation-conductive solid ceramic electrolyte (=“AFK”) F (e.g. NaSICON). During the electrolysis process for producing the alkali metal alcoholates with F instead of F′, an improved conductivity is provided, whereby for a constant current density, a lower voltage can be used.

The application discloses an electro-catalytic oxidation control method, a control system, a medium and a product, and relates to the field of electric digital data processing. According to the application, the control system determines a COD allowable fluctuation interval based on the instantaneous water inflow COD concentration, then calculates the average current efficiency and uses the same to determine the working current, and then accurately controls the electro-catalytic oxidation process according to the current density and the hydraulic retention time. The adaptive control method can timely respond to the water quality change of the water inflow, ensures that the water outflow meets the standard, avoids energy waste, has higher treatment efficiency and better economy compared with the traditional constant current density control mode, and forms a closed-loop control when the water outflow exceeds the standard.

The invention provides a preparation method of a pyroxasulfone intermediate, which comprises the following steps: reacting a glyoxylic acid aqueous solution with hydroxylamine hydrochloride to obtain glyoxylic acid oxime; s2, adding water into glyoxylic acid oxime obtained in S1 to form a glyoxylic acid oxime solution, transferring the glyoxylic acid oxime solution to a cathode chamber of an electrolytic tank, and then adding buffer salt and sodium chloride; adding a liquid alkali solution into the anode chamber; carrying out electrolytic reaction under the condition of constant current density to obtain a solution containing dichloroformaldoxime; carrying out extraction separation on the solution containing dichloroformaldoxime by adopting an organic solvent to obtain an organic solution of dichloroformaldoxime; mixing isobutene with a solvent, and adding alkali and a catalyst to form an organic phase; the preparation method comprises the following steps: adding dichloroformaldoxime into an organic phase, slowly dropwise adding a solution containing dichloroformaldoxime into the organic phase, carrying out a cyclization reaction, and after the reaction is completed, carrying out filtration and distillation to obtain a target product 3-chloro-5, 5-dimethyl-4, 5-dihydroisoxazole.

The application relates to the technical field of electrocatalysis, and discloses a preparation method of a self-supporting Ni-based catalyst, which comprises the following steps: immersing a foamed copper into an electrodeposition solution, performing electrodeposition under a constant current density, washing with clean water after taking out, drying, and obtaining the self-supporting Ni-based catalyst; the electrodeposition solution comprises a nickel source, a tungsten source, a citrate, boric acid and sodium chloride. The Ni-W amorphous catalyst is directly grown on the foamed copper substrate through a one-step constant current electrodeposition method, a self-supporting structure is formed, no binder is needed, the active substance is firmly combined with the substrate, is not easy to fall off, and has good stability. By introducing disordered W doping into the Ni, the electrocatalytic nitrate reduction performance of the catalyst is significantly improved: the overpotential is obviously reduced, the current density is significantly increased, and the ammonia production Faraday efficiency is as high as 94% at-0.3 V.

The invention discloses an electrocatalytic oxidation control method and system, a medium and a product, and relates to the field of electric digital data processing. By implementing the application, the control system determines the COD allowable fluctuation interval based on the instantaneous inflow COD concentration, then calculates the average current efficiency and is used for determining the working current, and then accurately controls the electrocatalytic oxidation process according to the current density and the hydraulic retention time. The self-adaptive control method can respond to the quality change of the inlet water in time, energy waste is avoided while it is guaranteed that the outlet water reaches the standard, and compared with a traditional constant current density control mode, the self-adaptive control method has higher treatment efficiency and better economical efficiency. And when the effluent exceeds the standard, the control system can automatically adjust the average current efficiency and re-execute the control flow, so that closed-loop control is formed.

This invention discloses a method for detecting the bipolar plate coating of a proton exchange membrane electrolyzer, relating to the field of proton exchange membrane electrolyzer technology. The detection method includes the following steps: assembling titanium sheets with a bipolar plate coating in an electrolyzer to obtain an electrolyzer containing titanium sheets; first, cyclically activating the electrolyzer containing titanium sheets at different current densities, and then operating it at a constant current density to test the stability of the bipolar plate coating. This invention introduces titanium sheets coated with a bipolar plate into the electrolyzer and performs operating condition tests to realistically reproduce the corrosive environment of the electrolyzer; the use of thin titanium sheets for testing is very convenient, and further allows for the evaluation of the contact resistance between the coating and the gas diffusion layer of the electrolyzer, as well as morphological characterization such as scanning electron microscopy (SEM), thereby more accurately and intuitively evaluating the lifetime and surface conductivity of the bipolar plate coating, and assessing the degree of corrosion on the coating surface.