Hydrogen absorption/desorption behavior of Mg50La20Ni30 bulk metallic glass

In this work, Mg₅₀La₂₀Ni₃₀ bulk metallic glass (BMG) was prepared and its hydrogen absorption/desorption behavior was studied. The amorphous structure was found to be retained after gaseous hydrogenation. The T_g and T_x of the hydrogenated Mg₅₀La₂₀Ni₃₀ BMG was 561 K and 619 K respectively, much higher than the corresponding value of 463 K and 504 K of the unhydrogenated sample. Mg₅₀La₂₀Ni₃₀ BMG absorbed 0.73 and 1.85 wt% hydrogen within 1 h at 313 K and 423 K respectively, which was higher than that of ball-milled Mg₂Ni alloy. Mg₅₀La₂₀Ni₃₀ BMG exhibited an equilibrium hydrogen absorption plateau with a pressure of 0.07 MPa in pressure–composition isotherm curve at 423 K. It suggested that Mg-based BMGs are promising materials for hydrogen storage applications.