Hydrogen storage properties of a Mg–Ni–Fe mixture prepared via planetary ball milling in a H2 atmosphere

Song, Myoung Youp; Baek, Sung Hwan; Bobet, Jean-Louis; Hong, Seong‐Hyeon

doi:10.1016/j.ijhydene.2010.07.161

Cited by 67 publications

(23 citation statements)

References 23 publications

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“…20) 0.5 g of the samples was used for the measurement of the absorbed or desorbed hydrogen quantity as a function of time. Samples after reactive mechanical grinding and after hydriding-dehydriding cycling were characterized by X-ray diffraction(XRD) with Cu Kα radiation, using a Rigaku D/MAX 2500 powder diffractometer.…”

Section: Methodsmentioning

confidence: 99%

Improvement of Hydrogen Storage Properties of Mg by Addition of NbF5 via Mechanical Milling under H2

Kwak¹,

Song²,

Mumm³

2013

Korean. J. Mater. Res.

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A 90 wt% Mg-10 wt% NbF 5 sample was prepared by mechanical milling under H 2 (reactive mechanical grinding). Its hydriding and dehydriding properties were then examined. Activation of the 90 wt% Mg-10 wt% NbF 5 sample was not required. At n = 1, the sample absorbed 3.11 wt% H for 2.5 min, 3.55 wt% H for 5 min, 3.86 wt% H for 10 min, and 4.23 wt% H for 30 min at 593K under 12 bar H 2 . At n = 1, the sample desorbed 0.17 wt% H for 5 min, 0.74 wt% H for 10 min, 2.03 wt% H for 30 min, and 2.81 wt% H for 60 min at 593K under 1.0 bar H 2 . The XRD pattern of the 90 wt% Mg-10 wt% NbF 5 after reactive mechanical grinding showed Mg, β-MgH 2 and small amounts of γ-MgH 2 , NbH 2 , MgF 2 and NbF 3 . The XRD pattern of the 90 wt% Mg-10 wt% NbF 5 dehydrided at n = 3 revealed Mg, β-MgH 2 , a small amount of MgO and very small amounts of MgF 2 and NbH 2 . The 90 wt% Mg-10 wt% NbF 5 had a higher initial hydriding rate and a larger quantity of hydrogen absorbed for 60 min than the 90 wt% Mg-10 wt% MnO and the 90 wt% Mg-10 wt% Fe 2 O 3 , which were reported to have quite high hydriding rates and/or dehydriding rates. The 90 wt% Mg-10 wt% NbF 5 had a higher initial dehydriding rate (after an incubation period) and a larger quantity of hydrogen desorbed for 60 min than the 90 wt% Mg-10 wt% MnO and the 90 wt% Mg-10 wt% Fe 2 O 3 .

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Section: Methodsmentioning

confidence: 99%

Improvement of Hydrogen Storage Properties of Mg by Addition of NbF5 via Mechanical Milling under H2

Kwak¹,

Song²,

Mumm³

2013

Korean. J. Mater. Res.

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“…24) 0.5 g of the samples was used for these measurements. Samples after reactive mechanical grinding and those after hydriding-dehydriding cycling were characterized by X-ray diffraction (XRD) with Cu Kα radiation, using a Rigaku D/MAX 2500 powder diffractometer.…”

Section: Methodsmentioning

confidence: 99%

Hydrogen Storage Properties of Pure MgH2

Kwak¹,

Lee²,

Park³

et al. 2013

Korean. J. Mater. Res.

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The hydrogen storage properties of pure MgH 2 were studied and compared with those of pure Mg. At the first cycle, pure MgH 2 absorbed hydrogen very slowly at 573 K under 12 bar H 2 . The activation of pure MgH 2 was completed after three hydriding-dehydriding cycles. At the 4 th cycle, the pure MgH 2 absorbed 1.55 wt% H for 5 min, 2.04 wt% H for 10 min, and 3.59 wt% H for 60 min, showing that the activated MgH 2 had a much higher initial hydriding rate and much larger H a (60 min), quantity of hydrogen absorbed for 60 min, than did activated pure Mg. The activated pure Mg, whose activation was completed after four hydriding-dehydriding cycles, absorbed 0.80 wt% H for 5 min, 1.25 wt% H for 10 min, and 2.34 wt% H for 60 min. The particle sizes of the MgH 2 were much smaller than those of the pure Mg before and after hydridingdehydriding cycling. The pure Mg had larger hydrogen quantities absorbed at 573K under 12 bar H 2 for 60 min, H a (60 min), than did the pure MgH 2 from the number of cycles n = 1 to n = 3; however, the pure MgH 2 had larger H a (60 min) than did the pure Mg from n = 4 to n = 6.

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“…The hydriding apparatus has been described previously [13]. The absorbed or desorbed hydrogen quantity was measured as a function of time by a volumetric method.…”

Section: Methodsmentioning

confidence: 99%