Hydrogen absorption/desorption behavior of Mg_(50)La_(20)Ni_(30) bulk metallic glass

摘要

In this work, Mg_(50)La_(20)Ni_(30) 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 Mg_(50)La_(20)Ni_(30) BMG was 561 K and 619 K respectively, much higher than the corresponding value of 463 K and 504 K of the unhydrogenated sample.Mg_(50)La_(20)Ni_(30) 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 Mg_2Ni alloy. Mg_(50)La_(20)Ni_(30) 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.