32results about How to "High catalytic activity for oxygen evolution" patented technology

The invention provides a preparation method of a foam metal-based lead alloy composite anode material. The preparation method comprises the following steps: treating the surface of a foam metal substrate and forming a tin-bismuth alloy layer on the surface of the foam metal substrate; then preparing a nano-oxide composite lead alloy; and then cladding the nano-oxide composite lead alloy onto the foam metal substrate with the tin-bismuth alloy layer on the surface by using a bimetal continuous extrusion cladding machine so as to prepare the foam metal-based lead alloy composite anode material for high-efficiency electrocatalytic oxygen evolution. The foam metal-based lead alloy composite anode material prepared by the invention gives full play to the high-efficiency electrocatalytic oxygenevolution activity of the nano-oxide composite lead alloy and the advantages of the foam metal substrate, and has the characteristics of light weight, good conductivity, high-efficiency electrocatalytic oxygen evolution performance, high corrosion resistance and the like, and can reduce resource consumption and save energy.

The invention relates to a preparation method of a long-life iridium-zirconium composite oxide inert anode. The preparation method involves an iridium-cerium-zirconium or iridium-tin-zirconium ternarycomposite oxide inert anode, and an iridium-cerium-rubidium-zirconium or iridium-tin-rubidium-zirconium quaternary composite oxide inert anode. The prepared anode consists of a titanium matrix and anoxide coating; and in the coating, zirconium dioxide and rubidium oxide are amorphous phases, iridium dioxide and tin dioxide are rutile phases, cerium dioxide is a fluorite phase, the conductivity of the anode is enhanced through addition of rubidium, precipitation of oxygen evolution active substances IrO2 crystals is promoted by adding zirconium, cerium doping plays a role in refining crystalgrains, the zirconium or the cerium is added to increase the active surface area of the anode, and doping of the zirconium, the cerium or the tin improves the corrosion resistance of the anode in a sulfuric acid system and thus prolongs the service life of the anode. The preparation process of the method is simple, the prepared anode has better oxygen evolution catalytic activity and a long service life, and in addition, as the noble metal iridium in the coating is replaced by non-noble metal, the production cost of the anode is reduced.

The invention discloses a method for preparing a manganese-cobalt composite material through cathodic electrodeposition. The method comprises the steps that electroplating liquid containing manganeseions and cobalt ions is added into an electroplating bath, a composite anode and a stainless steel cathode are inserted into the electroplating bath, and constant-current electroplating is carried outat indoor temperature for preset time, wherein the composite anode comprises, by mass, 10-30% of tin, 0.1-5% of cobalt and the balance lead. The working procedure of achieving electrodeposition of aMn-Co spinel coating on the stainless steel cathode can be complete in the same electroplating bath, no MnO2 is produced in the electrodeposition process, the influences of MnO2 particles impurities on the performance of the coating are reduced, and consumption of the manganese ions in the electroplating liquid is reduced.

The invention relates to a preparation method and application of NiFe-LDH oxygen evolution electrocatalytic material rich in cation vacancy. The preparation method includes the steps of (1) soaking Ni-Fe alloy matrix in electrolyte which contains, by weight, 1-3% of NaF, 4-7% of (NH4)2MoO4, 15-25% of H2O, 25-40% of glycerol and 25-55% of phosphoric acid; (2) subjecting the Ni-Fe alloy matrix soaked in the electrolyte to anodizing to obtain NiFeMo anodized film; (3) subjecting a sample treated in step (2) to alkaline liquid etching, washing, and drying to obtain the NiFe-LDH oxygen evolution electrocatalytic material. The NiFe-LDH oxygen evolution electrocatalytic material prepared herein has high catalytic activity and good electrochemical stability; the preparation method is simple, efficient and low in cost, is well popularizable and helps further promote the development and application of LDH catalysts.

The invention provides a preparation method of a high specific surface area porous carbon doped iridium (HAPC / Ir) catalyst for water electrolysis for generating hydrogen, and belongs to the technicalfields of chemical power supply and new materials. According to the preparation method, MOF-5 is taken as the template, and the prepared material is applied to electrode materials. Through an impregnation method, iridium ions are merged to an organic frame made of MOF-5 through impregnation to obtain a precursor, and finally the precursor is made into the high specific surface area porous carbon doped iridium (HAPC / Ir) catalyst. The method and operation are simple, the equipment requirements are low, and high specific surface area porous carbon materials can be prepared massively. The technical process has the characteristics that the corrosion resistant performance of a positive electrode catalyst for water hydrolysis is enhanced in acidic electrolyte, and moreover, the stability of the catalyst is improved. Furthermore, the raw material (HAPC / Ir) is mild, nontoxic and safe, the resources of part materials are wide, and the industrial prospect is good.

The invention provides a device and method for removing hexavalent chromium from electroplating wastewater for electrocoagulation-electric flotation, wherein the device includes an electrocoagulation unit and a neutralization reaction unit arranged in sequence and communicated with each other, and a pump for pump is arranged beside the neutralization reaction unit An air compressor for feeding compressed air, a communication pipe for preventing liquid backflow is provided between the electrocoagulation unit and the neutralization reaction unit; a flow guide pipe for guiding compressed air is arranged in the neutralization reaction unit After the neutralization reaction unit, a first electric floating unit and a second electric floating unit are sequentially arranged, and the first electric floating unit is provided with a first interlocking electrode and a first three-phase separator; The second electric floating unit is provided with a second interlocking electrode and a second three-phase separator. The device and method provided by the invention have high electrical conductivity and low power consumption, can effectively reduce operating costs, do not need to add polymer flocculants, and can effectively improve the removal efficiency of hexavalent chromium and total chromium.

The invention provides a novel three-dimensional anode material for hydrogen production by water electrolysis. The novel three-dimensional anode material comprises nickel foam loaded N-doped carbon / transition metal oxide prepared in situ according to a liquid-solid synthesis method as well as a three-dimensional anode piece used for hydrogen production through water electrolysis. A preparation method of the three-dimensional anode material particularly comprises the following steps: (1) immersing clean nickel foam into a mixed solution, containing transition metal salt, a silicon source and a nitrogen source, of water and ethanol, taking out the nickel foam for airing, and repeating for three times; (2) calcining the nickel foam piece obtained in the step (1) for 1-6 h at 600-800 DEG C under the protection of inert gas, and then heating for 1-1.5 h at 200-250 DEG C in the atmosphere of O2, so as to obtain a nickel foam loaded N-doped carbon / transition metal oxide three-dimensional electrode. The three-dimensional electrode produced according to the preparation method has relatively low oxygen evolution overvoltage, has relatively high structural stability and oxygen evolution catalytic activity under long-term alkaline electrolysis condition, is simple in production process and adjustable in electrode component and variety, and has wide application prospects.

The invention relates to a preparation method of a double-effect oxygen electrode catalyst, in particular to the preparation method of a regenerable fueling battery oxygen electrode catalyst taking Pt as a basis. The method comprises the following steps: directly mixing a certain amount of H2IrCI6 and H2 PtCl6 into an organic solvent; adjusting the proportion of the H2IrCI6 and the H2 PtCl6; dripping the mixture onto a conductive matrix; and preparing an IrO2 Pt efficient catalyst through the thermal decomposition method, thereby not only the oxygen-evolution catalytic activity of the catalyst can be greatly improved, the electric potential can be reduced, and the availability of the catalyst is improved, but also the preparation process is simple, and no impurity enters; the prepared product can also be used for cathodic and anodic catalysts for other fuel batteries and other fields such as gas reforming, organic matter schizolysis, pollutant treatment, seawater electrolysis, and the like.

The invention discloses a preparation method for a high-activity iridium-zirconium-series compound oxide anode for hydrometallurgy. The high-activity iridium-zirconium-series compound oxide anode comprises an iridium-zirconium binary compound oxide inert anode, an iridium-ruthenium-zirconium ternary compound oxide inert anode, an iridium-cobalt-zirconium ternary compound oxide inert anode, an iridium-molybdenum-zirconium ternary compound oxide inert anode, an iridium-rubidium-zirconium ternary compound oxide inert anode and an iridium-ruthenium-rubidium-zirconium quaternary compound oxide inert anode. The prepared anode consists of a titanium substrate and an oxide coating, the zirconium dioxide and the rubidium oxide in the coating are amorphous phases, the iridic oxide and the rutheniumdioxide are rutile phases, the cobaltosic oxide is the spinel phase, the molybdenum trioxide is an alpha phase, the adding of the zirconium, or ruthenium or cobalt increases the oxygen evolution activity surface area of the anode, the anode activity is improved, and the adding of the rubidium or molybdenum improves the conductivity of the anode. The preparation method is simple in preparation process, the prepared anode has higher oxygen evolution catalytic activity and longer service life, and as the precious metal iridium element in the coating is replaced by the non-precious metal, the production cost of the anode is reduced.