Microstructural development in nanocrystalline MgH2MgH2 during H-absorption/desorption cycling

Hydriding kinetics of ball-milled nanocrystalline MgH2 powders

“…6. 39 Note that, contrary to the different nanostructures obtained from x-ray line profile analysis, SEM study showed that powder particle size remained the same after repeated hydriding/ dehydriding (see Fig. In this section, we focus on the parameters only of A L S (m,), since the variables of the A L D (, R e , C, b) function have little physical information in the case of a tetragonal phase.…”

Synthesis and enhanced hydrogen desorption kinetics of magnesium hydride using hydriding chemical vapor synthesis

“…However, for the HCVS-MgH 2 with angulated plate morphology, it was found that only 5.6 wt% H 2 was desorbed within 1 h at 10th cycle. In the literatures on MgH 2 powders, it was noted that the enhanced hydrogen storage performance was evaluated during H 2 absorption-desorption cycles [11,12]. On the other hand, the HCVS-MgH 2 samples showed the different hydriding-dehydriding properties, indicating the outstanding activation behavior and durability.…”

“…Next, many attempts have been made to overcome these problems by high energy ball-milling of MgH 2 without the use of any additives. This resulted in enhanced hydrogen desorption properties by microstructural and morphological changes, which presents a major drawback in its commercial application for hydrogen storage [11][12][13][14].…”

Relationship between microstructure and hydrogen storage properties of nanomaterials

“…Figure 8.4 shows the fi rst and the second desorption curves measured in vacuum for MgH 2 ball-milled for 10 hours at 300°C. As the nuclei grow, the induced strains cause the fracture of the passivation layer, exposing a fresh activated surface [22]. For subsequent cycles, further changes in the desorption curves are not observed.…”