Gaseous and Electrochemical Hydrogen Storage Performances of Nanocrystalline and Amorphous Mg20-xLaxNi10(x=0-6) Alloys Prepared by Melt-Spinning

Hui Ping Ren; Bao Wei Li; Yin Zhang; Zai Guang Pang; Zhong Hui Hou; Yang Huan Zhang

doi:10.4028/www.scientific.net/AMR.393-395.786

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Gaseous and Electrochemical Hydrogen Storage Performances of Nanocrystalline and Amorphous Mg_20-xLa_xNi₁₀(x=0-6) Alloys Prepared by Melt-Spinning

Abstract:

The nanocrystalline and amorphous Mg2Ni-type Mg20-xLaxNi10 (x = 0, 2, 4, 6) hydrogen storage alloys were prepared by melt-spinning technology. The microstructures and hydrogen storage performances of the alloys were characterized. The results show that no amorphous phase is detected in the as-spun La-free alloy, but the as-spun alloys substituted by La hold a major amorphous phase, confirming that the substitution of La for Mg increases the glass forming ability of the Mg2Ni-type alloy. Melt-spinning remarkably improves the hydrogen storage performances of the alloys. When the spinning rate increases from 0 (As-cast was defined as spinning rate of 0 m/s) to 30 m/s, the hydrogen absorption capacity of the alloy (x = 2) at 200°C and 1.5 MPa in 10 min rises from 1.26 to 2.60 wt%, and its electrochemical discharge capacity grows from 197.2 to 406.5 mAh/g at a current density of 20 mA/g.