Method for preparing AB5 type hydrogen-storage alloy directly from metal oxide mixture

Abstract

The invention relates to a method for direct preparation of AB5 type hydrogen storage alloys through metal oxide mixture, belonging to the solid oxygen permeable membrane electrolysis method alloy preparation technology technical field. The method mainly utilizes the solid oxygen permeable membrane technology and an electrochemical method to directly prepare the AB5 type hydrogen storage alloys through the oxide mixture of target alloys. The metal oxide mixture which forms the elemental constituent of the hydrogen storage alloys is pressed into a wafer which is used as a cathode, and graphite is used as an anode; the metal oxide mixture wafer is arranged inside a solid oxygen permeable membrane pipe; the metal oxide mixture wafer and the graphite which are used as the cathode and the anode are arranged inside a graphite crucible electrolytic cell which is stored with copper liquid, and then electrolysis is performed after galvanization and heating; the electrolytic voltage is 0 to 4.5 volts and the electrolytic current is 0 to 6.0 amperes; finally the AB5 type hydrogen storage alloys are obtained. The compositions of raw materials used by the AB5 type hydrogen storage alloys are as follows: La2O3 of 18.1+-0.46 weight percent, CeO2 of 8.54+-0.28 weight percent, Pr2O3 of 0.73+-0.18 weight percent , Nd2O3 of 2.46+-0.18 weight percent, MnO2 of 6.42+-0.24 weight percent, Al2O3 of 1.77+-0.30 weight percent , Co2O3 of 11.17+- 0.22 weight percent and residual NiO.

Description

Technical field: [0001] The present invention relates to a kind of direct preparation AB by metal oxide mixture 5 The invention discloses a method for a type hydrogen storage alloy, which belongs to the technical field of an alloy preparation process by electrolysis of a solid oxygen-permeable membrane. Background technique: [0002] Hydrogen energy is known as the green new energy in the 21st century, because 1. Hydrogen energy has a high calorific value, burning 1kg of hydrogen can produce 1.25×10 6 The heat of kJ is equivalent to the heat generated by the complete combustion of 3kg gasoline or 4.5kg coke. 2. The product of hydrogen combustion is water, which has no pollution to the environment and is a green and clean energy. 3. Hydrogen is the most abundant element in the universe. It comes from a wide range of sources. It can be produced by decomposing water from natural energy such as solar energy, wind energy, and geothermal energy. It is a renewable resource that c...

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Problems solved by technology

[0004] The preparation methods of hydrogen storage alloy mainly include 1. Induction melting method: after high-frequency current flows through the water-cooled copper coil, an induced current is generated in the metal charge due to electromagnetic induction, and heat is generated when the induced current flows in the metal charge, so that the metal The furnace charge is heated and melted, but it consumes a lot of power, and the alloy structure is difficult to control; 2. Mechanical alloying (MA, MG) method: use a grinding ball with great kinetic energy to repeatedly extrude and deform different powders. Fracture, welding, and extrusion deformation into an intermediate composite

Under the continuous action of mechanical force, this complex continuously produces new atomic planes, and makes the formed layered structure continuously refined, thereby shortening the interdiffusion distance between solid particles and accelerating the alloying process, but the formed after ball milling The fresh surface is so reactive that it undergoes an oxidation reaction with air at room temperature, which renders the surface passive and unable to absorb hydrogen

3. Reduction diffusion method: the method of combining the reduction process of elements with the reaction diffusion process between elements to directly produce intermetallic compounds in the same operation process, but the product is affected by raw materials and reducing impurities, and the reducing agent should be 1.5 times in excess ~2 times, the removal of excess reducing agent and by-products after the reaction is also troublesome

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