Highly Improved Gaseous Hydrogen Storage Characteristics of the Nanocrystalline and Amorphous Nd–Cu-added Mg2Ni-type Alloys by Melt Spinning

Synthesis and characterization of a Mg Ni-RE alloy for hydrogen storage

“…The desorption kinetics is reported in figure 6, where it is shown that the hydride reaches 3.8% of hydrogen desorption in about six minutes. Indeed, as demonstrated in literature [41][42][43][44][45][46][47][48][49][50][51][52][53][54][55], it can be expected that the presence of heteroatoms in Mg-Ni alloys can have positive effects on the desorption kinetics.…”

“…Then, kinetics improvements and a decrease of the decomposition temperature can be obtained with both chemical alloying and material processing (melt spinning, mechanical alloying) [31][32][33][34][35][36][37][38][39][40][41][42][43]. Zhang et al [44][45][46][47] produced Mg 2 Ni-type alloys as Mg 2 Ni (1-x) Co x , Mg 2 Ni (1-x) Cu x and Mg 2 Ni (1-x) Mn x (x = 0, 0.1, 0.2, 0.3, 0.4) by melt spinning technique, obtaining an almost complete desorption of hydrogen in 20 minutes with a quantity of hydrogen desorbed ranging from 0.5 and 2.3 weight % as a function of spinning rate and Co, Cu and Mn concentrations. Iturbe-Garcıa et al [48] studied the behavior along the temperature range from 25 to 350 °C of Mg 2 Ni-hydrides obtained by mechanical alloying.…”

Dehydrogenation behavior and microstructure evolution of hydrogenated magnesium–nickel–yttrium melt-spun ribbons

“…Work has proved that the addition of transition metal elements, 2,3 rare metal elements 4,5 and catalysts 6,7 into Mgbased alloys decreases the stability of hydrides and increases the dehydrogenation kinetics. 8 However, the excellent kinetics caused by the addition of transition metal elements are at the expense of low dehydrogenation capacities. It has been found that rare earth (RE) elements not only accelerate the dehydrogenation kinetics, but also enhance the dehydrogenation capacity compared with transition metal elements by substituting B side elements of A 2 B-type Mg-based alloys, and decrease the hydrogen desorption temperature.…”

“…13 The microstructure is closely related to the thermodynamics and kinetics of hydrogenation/dehydrogenation. 8 The diffusion of hydrogen atoms in alloys and hydrides is an important factor in the hydrogen desorption kinetics. A nanoscale-rened grain size and amorphous structure can signicantly enhance the hydrogen absorption/desorption kinetics and hydrogen storage capacity since the rened grain generates a large number of interfaces along which hydrogen atoms can diffuse more easily.…”

“…14,15 For microstructure modication, ball milling 16 and melt spinning 17 have been proved to be powerful techniques to produce amorphous and nanocrystalline Mg 2 Ni alloys. 8 However, ball milling is still limited by some unavoidable shortcomings: contamination of metal powders by milling equipment and oxygen even in argon atmosphere, 18 small scale production and its relatively high cost for special safe handling of the powder such as heat-transfer and pipe blockage. 3 In addition, the growth of ball milled particles occurs at a high reaction temperature and deteriorates the kinetic properties.…”