Hydride stability and hydrogen desorption characteristics in melt-spun and nanocrystallized Mg–Ni–La alloy

Structural and hydriding/dehydriding properties of Mg–La–Ni-based composites

“…By adjusting the chemical compositions of the Mg-based alloys, enhanced hydrogen storage properties have been obtained. These studies include multi-alloying of Mg with other elements [10][11][12][13][14][15][16][17], adding catalysts to the alloys [18][19][20][21] and preparing Mg-based composites like Mg-TiZrMnVFeNi [22], Mg-MmNi 5 [23], Mg-ZrMn 2 [24], Mg-NiCo 2 O 4 [25], Mg-LiNH 2 [26], Mg-TiB 2 [27], Mg-TiVMn [28], and so on.…”

Hydrogen Storage Properties and Structure of Magnesium-Based Alloys Prepared with Melt-Spinning Technique

“…Pressure -composition isotherms for the melt-spun Mg85Ni10La5 alloy. (Tanaka, 2008) Relationships between the pressure and inverse temperature for the first and second plateaus in the absorption and desorption processes are shown in Fig. 4.…”

“…Values of Edes obtained in this way are also given in the figure. (Tanaka, 2008) To examine further the evolution of TDS spectra due to heating up to higher temperatures (380C), measurements have been done for a single specimen of melt-spun Mg85Ni10La5 alloy using D2 gas, instead of H2 gas, as shown in Fig. 14. The specimen is fully pre-charged at 300C under 1 MPa of D2 pressure in every cyclic measurement, and heated from room temperature up to 300C for the 1 st to 5 th cycles, and up to 380℃ for the 6 th to 10 th cycles at a rate of 1℃/min.…”

“…Evolution of TDS peaks of a melt-spun Mg90Ni10 alloy subjected to 1 st to 4 th hydrogenation/thermal desorption cycles. (Tanaka, 2008) We next discuss the hydrogen desorption process in melt-spun Mg85Ni10La5 alloy. As mentioned in connection with eq.…”

“…The effective binding energy may be evaluated from the formation enthalpy ΔHf of the hydride, as shown below. (Tanaka, 2008) Figure 15 displays a potential energy diagram of hydrogen existing in the hydrides or nanoboundaries in melt-spun Mg85Ni10La5 relative to that of the gas phase at standard state. Here, the formation enthalpy ΔHf is taken as the potential energy E in a hydride, and values given in Table 1 (desorption process) are used for the MgH2 and Mg2NiH4 hydrides.…”