Lanthanum oxide catalyzed high-capacity hydrogen storage alloy for fuel cells and preparation method thereof

Abstract

The invention relates to a lanthanum oxide catalysis high power capacity hydrogen storing alloy for fuel cells and a preparing method of the lanthanum oxide catalysis high power capacity hydrogen storing alloy. The hydrogen storing alloy comprises a first component, namely Mg50-x-y-zRExZryVzNi25-m-nCumMnn; RE in the formula is at least one of rare earth elements including yttrium, samarium, praseodymium and neodymium; and x, y, z, m and n are atomic ratios; 1<x<6, 0.5<y<3, 0.1<z<0.5, 2<m<6, and 2<n<6. According to the La2O3 catalysis high power capacity hydrogen storing alloy for the fuel cells, the amorphous forming ability of a Mg2Ni alloy is improved. Meanwhile, the heat stability of alloy hydride is reduced, and the alloy has the high hydrogen absorption capacity and hydrogen absorption and release dynamics at the low temperature. Meanwhile, due to adding of rare earth, zirconium, vanadium, copper and manganese, the structure stability of a rapid quenching state alloy is increased, and the alloy hydrogen absorption and release circulation stability is improved.

Description

technical field [0001] The invention belongs to the technical field of hydrogen storage alloy materials, and in particular relates to a high-capacity hydrogen storage alloy catalyzed by lanthanum oxide for fuel cells and a preparation method thereof. Background technique [0002] Magnesium-based alloys have the characteristics of light weight, high hydrogen storage density, and abundant resources, 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 capacity requirements of fuel cells. However, crystalline Mg and Mg 2 Ni alloy has almost no reversible hydrogen absorption and desorption ability at room temperature, and the alloy prepared by conventional melting and casting process has very low hydrogen absorption and desorption capacity and extremely poor kinetic properties. Th...

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Problems solved by technology

However, the preparation efficiency of mechanical ball milling is very low, and the abrasive is easily mixed into the alloy, which may easily pollute the alloy and reduce the purity.

In addition, the hydrogen absorption and desorption cycle stability of ball milled alloys is extremely poor, which is far from meeting the requirements of practical application.

Preparation of Mg by Vacuum Rapid Quenching Technology 2 Ni-type alloys have been reported at home and abroad, but the hydrogen storage thermodynamics and kinetic properties of the alloys still cannot meet the practical requirements, and urgently need to be improved.

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