A kind of rare earth hydrogen storage material and its preparation method

Abstract

A rare earth hydrogen storage material and preparation method thereof, involving an AB 2 Type yttrium-magnesium-nickel-based rare earth hydrogen storage materials. It is characterized in that its rare earth hydrogen storage material is composed of general formula Y a A b Mg c Ni x B y yttrium-magnesium-nickel-based hydrogen storage material; the material has a 2 Type (Y,A,Mg)(Ni,B) 2 The phase is the main phase and contains A at the same time 2 B 4 Type (Y,A)Mg(Ni,B) 4 Phase and AB 3 Type (Y,A,Mg)(Ni,B) 3 mixed-phase structure. The preparation method adopts the induction melting method, and the obtained alloy ingot is annealed under vacuum or argon atmosphere. An AB of the present invention 2 Type yttrium-magnesium-nickel-based rare earth hydrogen storage material, the A side is partially replaced by Mg, which can significantly improve the AB in the alloy 2 Phase structure stability, reducing hydrogen-induced amorphization and hydrogen-induced disproportionation of the alloy. At the same time, Al, Mn, etc. with a larger atomic radius are used to replace Ni elements to increase the unit cell volume of the alloy, thereby increasing the hydrogen storage capacity of the alloy. The material has good reversible hydrogen absorption and desorption characteristics, 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, relating 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, during the development and utilization of traditional non-renewable resources such as coal, oil, and natural gas, a series of problems have emerged, such as energy shortage, resource competition, and environmental pollution caused by excessive use of energy. It is imminent to establish a new energy system and find new energy sources that are pollution-free, 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 combustion calorific value, non-polluting products, energy storage medium, and wide range of uses. The storage and transportation of hydrogen are t...

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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