Preparation method of high-capacity hydrogen storage alloy for fuel cell

Abstract

The invention relates to a high-capacity Mg-Ti-RE-Ni-Co-Al based hydrogen storage alloy for fuel cells. The chemical formula of the alloy is Mg(50-x)TixY(10-y)REyNi(5-z-m)CozAl(m+n)wt%NG. According to the high-capacity Mg-Ti-RE-Ni-Co-Al based hydrogen storage alloy for the fuel cells, Mg is replaced with trace of Ti, stability of alloy hydride can be reduced, and Ti is a hydrogen absorption element, so that the hydrogen absorption capacity of the alloy can be kept by utilizing Ti to replace Mg. Meanwhile, a small amount of transition metal such as Ni, Co and Al is added, and accordingly, heat stability of the alloy hydride can be further reduced. Ni, Co and Al are good active elements though Ni, Co and Al cannot absorb hydrogen, and thermodynamic and dynamic performance of hydrogen absorption and desorption of the Mg-based alloy can be remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of hydrogen storage alloy materials, in particular to a method for preparing a high-capacity hydrogen storage alloy for fuel cells. Background technique [0002] Hydrogen is considered to be the most promising fuel in the 21st century and the preferred alternative to fossil fuels. The main technical obstacle to the application of hydrogen as a fuel is the lack of an efficient and safe hydrogen storage system. Among all hydrogen storage methods, metal hydride hydrogen storage is considered to be the most ideal hydrogen storage method. Magnesium-based alloys have the characteristics of light weight, high hydrogen storage density, and abundant reserves, and are currently recognized as the most promising hydrogen storage materials. of which the hydride MgH 2 and Mg 2 NeH 4 The hydrogen storage capacities are 7.6wt% and 3.6wt%. As far as its hydrogen storage capacity is concerned, it fully meets the capacit...

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Problems solved by technology

However, crystalline magnesium-based hydrogen storage alloys have almost no reversible ability to absorb and desorb hydrogen at room temperature, and alloys prepared by conventional melting and casting processes have very low hydrogen absorption and desorption capacity and extremely poor kinetic properties.

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