45results about How to "Reduce oxygen evolution overpotential" patented technology

The invention discloses a tungsten manganese calcium / mesoporous tungsten trioxide compound for preparing a photo-anode and a preparation method thereof. The tungsten manganese calcium / mesoporous tungsten trioxide compound is prepared from mesoporous tungsten trioxide and manganese calcium oxide. The mesoporous tungsten trioxide has a shorter electron migration distance, and the island-shaped tungsten manganese calcium oxide is used as an oxygen generation active center sites and has a lower oxygen evolution potential, so that the photo-anode prepared through the compound has higher photocatalysis oxygen generation activity. Compared with a corresponding single-component catalyst, according to a ternary compound semiconductor catalyst, the defects of a single catalyst are overcome through the compounding of manganese calcium and tungsten oxide, and the ternary compound semiconductor catalyst has the advantages of high charge separation efficiency, low oxygen evolution overpotential, good catalytic activity and stability, and the like, and is a promising novel catalytic material for preparing the photo-anode of a photochemical cell.

The invention discloses a method for preparing an anode material for non-ferrous metal electrodeposition. The invention is characterized in that: the anode material is prepared from the following materials in percentage by weight: 0.1 to 0.2 percent of silver, 0.05 to 0.1 percent of cobalt, 0.1 to 0.5 percent of tin, 0.05 to 0.09 percent of calcium, 0.1 to 1 percent of stibium and the balance of lead. The method comprises the following steps of: melting the lead, and adding a silver-cobalt intermediate alloy containing 0.1 to 0.2 percent of silver and a tin-cobalt intermediate alloy; melting, adding a lead-calcium intermediate alloy, an antimony block and the residual lead, stirring for at least 10 minutes, standing for 5 minutes, descumming, casting into an alloy plate blank; and cooling, rolling, performing surface treatment on a lead alloy plate, leveling, and shearing the plate into alloy anodes with required size. The prepared anode has good mechanical properties and corrosion resistance, and can greatly reduce cell voltage and energy consumption in the electrolysis process in the electrometallurgy process of wet electrodeposition of zinc, copper, nickel and the like.

The invention discloses a composite anode for hydrometallurgy and its preparation method and application. The structure of the composite anode is metal substrate / non-oxide intermediate layer / selective electrocatalytic oxygen evolution layer, wherein the non-oxide intermediate layer can isolate Oxygen diffuses to the metal substrate to avoid passivation of the metal substrate, and the selective electrocatalytic oxygen evolution layer can selectively catalyze oxygen evolution while inhibiting Mn in the electrolyte 2+ depletion. The composite anode can be used in the electrochemical metallurgical process of non-ferrous metals such as zinc, manganese, copper, etc., and when it is used for the electrodeposition of metal manganese, it can realize the equal current density of the cathode and the anode and the electrodeposition without diaphragm, which greatly reduces the energy of the electrodeposition process. Consumption, inhibition of Mn 2+ Oxidation losses at the anode improve cathodic current efficiency.

The invention discloses a method for preparing a zinc electrodeposited anode, which comprises: batching and mixing powder: batching lead powder, silver powder, and lead dioxide powder, rolling and mixing the batched powder until uniform; in mass percentage, The silver powder is 0.1-1%, the lead dioxide powder is 0.1-10%, and the rest is lead powder; pressing and sintering: pressing the uniformly mixed powder and sintering in a reducing and protective atmosphere; cooling: cooling the sintered material naturally. The invention has low equipment requirements and is easy to prepare the anode. The anode prepared by the invention has the advantages of low oxygen evolution overpotential, high mechanical strength, good corrosion resistance, long service life, etc., and can replace the traditional casting Pb-Ag anode.

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.