Rare earth hydrogen storage material and preparation method thereof

Abstract

The invention discloses a rare earth hydrogen storage material and a preparation method thereof, and relates to AB2-type yttrium-magnesium-nickel base rare earth hydrogen storage materials. The rare earth hydrogen storage material thereof is a yttrium-magnesium-nickel base hydrogen storage material having a general formula of YaAbMgcNixBy, and the material has a mixed-phase structure that regardsthe AB2-type (Y,A,Mg)(Ni,B)2 phase as a main phase, and contains the A2B4-type (Y,A)Mg(Ni,B)4 phase and AB3-type (Y,A,Mg)(Ni,B)3 phase at the same time. The preparation method thereof adopts a methodof induction melting, and anneals the obtained alloy ingot in a vacuum or argon atmosphere. In the AB2-type yttrium-magnesium-nickel base rare earth hydrogen storage material provided by the invention, A side is replaced by the Mg part, which can obviously improve the structural stability of AB2 phase in alloys and reduce hydrogen-induced amorphization and hydrogen-induced disproportionation of alloys; at the same time, Al, Mn and the like with a larger atomic radius are used to replace Ni elements to increase the unit cell volume of alloys, thereby increasing the hydrogen storage capacity ofalloys; and the material has good characteristic of reversible hydrogen absorption and desorption, and the maximum hydrogen storage capacity is greater than 1.6wt.%.

Description

technical field [0001] A rare earth hydrogen storage material and a preparation method thereof, relate to a hydrogen storage material, especially an AB 2 Type yttrium-magnesium-nickel-based rare earth hydrogen storage material and preparation method thereof. Background technique [0002] In recent years, in the process of traditional development and utilization of non-renewable resources such as coal, oil and natural gas, there have been a series of problems such as energy shortage, resource competition and environmental pollution caused by excessive use of energy. It is urgent to establish a new energy system and find new energy sources that are non-polluting, safe, reliable and sustainable. [0003] As a green and efficient energy carrier, hydrogen energy has attracted more and more attention due to its abundant reserves, high calorific value of combustion, non-polluting products, being an energy storage medium, and being widely used. The storage and transportation of hy...

AI Technical Summary

Problems solved by technology

The actual hydrogen storage capacity is only about 1.7wt.%, the alloy structure changes after hydrogen absorption and desorption, and the capacity drops significantly

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