Preparation of an Additive-Free Sample with a MgH2 Phase by Planetary Ball Milling of Mg with10 wt% MgH2

다국어 초록 (Multilingual Abstract)

In order to prepare an additive-free sample with a MgH2 phase, 90 wt% Mg+10 wt% MgH2 (named Mg-10MgH2) was milled under hydrogen atmosphere in a planetary ball mill for different durations (2 h, 5 h, and10 h). The hydrogen absorption and release properties of the prepared samples were investigated and comparedwith those of purchased pure MgH2 samples. Mg-10MgH2 milled for 5 h had the largest quantity of hydrogenreleased at 648 K for 100 min of 5.96 wt%. Mg-10MgH2 milled for 5 h released 0.11 wt% H for 10 min,4.85 wt% H for 30 min, and 5.83 wt% H for 60 min at 648 K at the first cycle. Mg-10MgH2 milled for 5 habsorbed 5.39 wt% H for 5 min and 5.92 wt% H for 60 min at 648 K at the second cycle. Dehydridingcurves were also obtained at the first cycle of Mg-10MgH2 samples milled for 5 h using Mg powder with orwithout sieving (200 mesh). The dehydriding curve at 648 K of a Mg-10MgH2 sample milled for 5 h in theplanetary ball mill was compared with that of the sample milled for 24 h in a horizontal ball mill.

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