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- W623792465 abstract "Nanocrystalline MgH2 powders were prepared by reactive ball milling of pure Mg powders under 50 bar of a hydrogen gas atmosphere, using a high energy ball mill operated at room temperature. The end-product of MgH2 powders obtained after 200 h of a continuous ball milling time composed of γ and β phases. The end-product was doped with 7 wt% of Mn3.6Ti2.4 powders and then mechanically milled under a hydrogen gas atmosphere for 50 h, using a high energy ball mill for different ball milling time. This end product coexisted with Fe and Cr contamination contents of 2.16 and 0.74 wt%, respectively. The effect of the ball milling time on the morphological characterizations, thermal stability and hydrogenation/dehydrogenation properties of MgH2/7 wt% Mn3.6Ti2.4 powders were investigated. The powders obtained after 50 h of milling had spherical-like morphology and homogeneously with uniform composition close to the starting nominal composition. Moreover, this binary nanocomposite system possessed superior hydrogenation/dehydrogenation kinetics at 275 °C, as suggested by the short time required to absorb and desorb 5.3 wt% H2 within 2 and 8 min, respectively. At this temperature, the synthesized nanocomposite powders possessed excellent absorption/desorption cyclability of 1000 complete cycles within 1400 h. However, a minor degradation (∼0.3–0.4 wt% H2) in the hydrogen storage capacity was observed between 410 h and 1400 h of the cycle-life-time. This slight degradation took place due to the grain growth came off in the Mg/Mn3.6Ti2.4 grains." @default.
- W623792465 created "2016-06-24" @default.
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- W623792465 date "2015-08-01" @default.
- W623792465 modified "2023-09-25" @default.
- W623792465 title "Effect of mechanically-induced solid-state doping time on the morphology and hydrogenation cyclability of MgH2/7 Mn3.6Ti2.4 nanocomposite powders" @default.
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- W623792465 doi "https://doi.org/10.1016/j.ijhydene.2015.05.089" @default.
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