scholarly journals Hydriding and Dehydriding Features of a Titanium-Added Magnesium Hydride Composite

2020 ◽  
Vol 26 (2) ◽  
pp. 199-204
Author(s):  
Eunho CHOI ◽  
Myoung Youp SONG
Keyword(s):  
Hydrogen Storage ◽  
Sorption Behavior ◽  
Particle Sizes ◽  
Mechanical Grinding ◽  
Hydrogen Storage Capacity ◽  
Hydrogen Storage Properties ◽  
Milled Sample ◽  
Milling In Hydrogen ◽  
Storage Properties ◽  
Effective Hydrogen

Magnesium has excellent hydrogen-storage properties except low hydriding and dehydriding rates. In the present work, titanium (Ti) was chosen as an additive to increase the hydriding rate of Mg and the dehydriding rate of MgH2. 15 wt.% Ti was added to MgH2 by milling in hydrogen (reactive mechanical grinding). The hydriding and dehydriding features of the Ti-added MgH2 composite (named 85 MgH2 + 15 Ti) were investigated. At the first cycle (n = 1), 85 MgH2 + 15 Ti absorbed 2.96 wt.% H for 2.5 min and 5.51 wt.% H for 60 min at 593 K in 12 bar H2, having an effective hydrogen-storage capacity of 5.51 wt.%. β-MgH2, γ-MgH2, TiH1.924, MgO, and MgTi2O4 were formed during reactive mechanical grinding. Reactive mechanical grinding of MgH2 with Ti is believed to create imperfections, produce cracks and clean surfaces, and decrease particle sizes. The phases formed during reactive mechanical grinding and their pulverization during reactive mechanical grinding are believed to make these effects stronger. Since the γ-MgH2 phase is believed to be decomposed at n = 1, the existence of the γ-MgH2 phase in the milled sample does not contribute to the improvement of the sorption behavior of Mg.

Development of Magnesium-Based Material with Hydrogen-Storage Capacity of 7 wt%

2021 ◽  
Vol 21 (8) ◽  
pp. 4353-4361
Author(s):  
Myoung Youp Song ◽  
Seong Ho Lee ◽  
Young Jun Kwak ◽  
Eunho Choi
Keyword(s):  
Hydrogen Storage ◽  
Ball Milling ◽  
Storage Capacity ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Hydrogen Storage Capacity ◽  
Hydrogen Storage Properties ◽  
Energy Ball ◽  
Milling In Hydrogen ◽  
Storage Properties

TiCl3 was chosen as an additive to increase hydriding and dehydriding rates of Mg. In our previous works, we found that the optimum percentage of additives that improved the hydriding and dehydriding features of Mg was approximately ten. Specimens consisting of 90 wt% Mg and 10 wt% TiCl3 (named Mg–10TiCl3) were prepared by high-energy ball milling in hydrogen. The specimens’ hydriding and dehydriding properties were then studied. Mg–10TiCl3 had an effective hydrogenstorage capacity (the quantity of hydrogen absorbed in 60 min) of approximately 7.2 wt% at 593 K under 12 bar H2 at the second cycle. After high-energy ball milling in hydrogen, Mg–10TiCl3 contained Mg, β-MgH2, and small amounts of γ-MgH2 and TiH1.924. TiH1.924 remained undercomposed even after dehydriding at 623 K in a vacuum for 2 h. The hydriding and dehydriding properties of Mg–10TiCl3 were compared with those of other specimens such as Mg–10Fe2O3, Mg–10NbF5, and Mg–5Fe2O3–5Ni, for which the hydrogen-storage properties were previously reported.

scholarly journals Milling Processes and Hydrogen Storage Properties of Mg-Graphene Composites

2019 ◽  
Vol 25 (3) ◽  
pp. 286-291
Author(s):  
Young Jun KWAK ◽  
Eunho CHOI ◽  
Myoung Youp SONG
Keyword(s):  
Hydrogen Storage ◽  
Hydrogen Uptake ◽  
Weight Percent ◽  
Particle Sizes ◽  
Cycle Number ◽  
Reactive Milling ◽  
Milling In Hydrogen ◽  
Storage Properties ◽  
Effective Hydrogen ◽  
Uptake And Release

Graphene was chosen as an additive to improve the hydrogen uptake and release properties of magnesium (Mg). Five weight percent of graphene was added to Mg or pre-milled Mg by milling in hydrogen (reactive milling). The milling processes and hydrogen uptake and release properties of the graphene-added Mg were investigated. Adding graphene to Mg and then milling the mixture of Mg and graphene in hydrogen for 6 h [named M5G (6 h)] had little effects on the improvement of hydrogen uptake and release properties of Mg. Pre-milling of Mg (for 24 h) and then adding 5 wt.% of graphene by milling in hydrogen (for 30 min) (named M5G) significantly increased the hydrogen uptake and release rates and the quantities of hydrogen absorbed and released for 60 min of Mg. The activation of M5G was completed after cycle number, CN, of two (CN = 2). M5G had a high effective hydrogen-storage capacity of 6.21 wt.% at 623 K in 12 bar H2 at CN = 3. M5G released 0.25 wt.% hydrogen for 2.5 min and 5.28 wt.% hydrogen for 60 min H2 in 1.0 bar H2 at 623 K at CN = 3. Pre-milling of Mg and then adding graphene by milling in hydrogen and hydrogen uptake-release cycling are believed to create defects, produce cracks and clean surfaces, and decrease particle sizes. DOI: http://dx.doi.org/10.5755/j01.ms.25.3.20567

Hydrogen-storage properties of Mg–10wt.% (Fe2O3, Ni, MnO) alloy prepared by reactive mechanical grinding

2006 ◽  
Vol 416 (1-2) ◽  
pp. 239-244 ◽  
Author(s):  
Myoung-Youp Song ◽  
Daniel R. Mumm ◽  
Sung-Nam Kwon ◽  
Seong-Hyeon Hong ◽  
Jong-Soo Bae
Keyword(s):  
Hydrogen Storage ◽  
Mechanical Grinding ◽  
Hydrogen Storage Properties ◽  
Storage Properties

Enhancement of the Hydrogen–Storage Properties of MgH2 by the Addition of Ni, NaAlH4, Ti, and CNT via Reactive Mechanical Grinding

2015 ◽  
Vol 15 (11) ◽  
pp. 8763-8772 ◽  
Author(s):  
Young Jun Kwak ◽  
Seong Ho Lee ◽  
Byung-Soo Lee ◽  
Hye Ryoung Park ◽  
Myoung Youp Song
Keyword(s):  
Hydrogen Storage ◽  
Mechanical Grinding ◽  
Hydrogen Storage Properties ◽  
Storage Properties

Hydrogen-storage properties of Mg–oxide alloys prepared by reactive mechanical grinding

2006 ◽  
Vol 415 (1-2) ◽  
pp. 266-270 ◽  
Author(s):  
Myoung Youp Song ◽  
IkHyun Kwon ◽  
SungNam Kwon ◽  
ChanGi Park ◽  
Seong-Hyeon Hong ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Mechanical Grinding ◽  
Hydrogen Storage Properties ◽  
Storage Properties

scholarly journals Preparation of Mg2FeH6Nanoparticles for Hydrogen Storage Properties

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
N. A. Niaz ◽  
I. Ahmad ◽  
N. R. Khalid ◽  
E. Ahmed ◽  
S. M. Abbas ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Hydrogen Absorption ◽  
Hydrogen Pressure ◽  
Absorption Rate ◽  
Desorption Kinetics ◽  
Prepared Compound ◽  
Hydrogen Storage Properties ◽  
Storage Properties ◽  
Effective Hydrogen ◽  
Type Apparatus

Magnesium (Mg) and iron (Fe) nanoparticles are prepared by thermal decomposition of bipyridyl complexes of metals. These prepared Mg-Fe (2 : 1) nanoparticles are hydrogenated under 4 MPa hydrogen pressure and 673 K for 48 hours to achieve Mg2FeH6. Their structural analysis was assessed by applying manifold techniques. The hydrogen storage properties of prepared compound were measured by Sieverts type apparatus. The desorption kinetics were measured by high pressure thermal desorption spectrometer (HP-TDS). More than 5 wt% hydrogen released was obtained by the Mg2FeH6within 5 min, and during rehydrogenation very effective hydrogen absorption rate was observed by the compound.

Improvement of hydrogen-storage properties of Mg by reactive mechanical grinding with Fe2O3

2005 ◽  
Vol 396 (1-2) ◽  
pp. 264-268 ◽  
Author(s):  
Ik-Hyun Kwon ◽  
Jean-Louis Bobet ◽  
Jong-Soo Bae ◽  
Myoung-Youp Song
Keyword(s):  
Hydrogen Storage ◽  
Mechanical Grinding ◽  
Hydrogen Storage Properties ◽  
Storage Properties

Structural and enhanced hydrogen storage properties of the Li12Mg3Si3Al phase

2021 ◽  
Vol 77 (5) ◽  
pp. 227-234
Author(s):  
Volodymyr Pavlyuk ◽  
Wojciech Ciesielski ◽  
Damian Kulawik ◽  
Nazar Pavlyuk ◽  
Grygoriy Dmytriv
Keyword(s):  
Hydrogen Storage ◽  
Storage Capacity ◽  
Hydrogen Desorption ◽  
Hydrogen Storage Capacity ◽  
Coordination Polyhedra ◽  
Hydrogen Storage Properties ◽  
New Material ◽  
Family Based ◽  
Storage Characteristics ◽  
Storage Properties

The multicomponent alumosilicide Li12Mg3Si3Al (cubic, space group I\overline{4}3d, cI76) belongs to the structural family based on the Cu15Si4 type. The Li atoms are ordered and occupy the site with symmetry 1 and the Mg atoms occupy the site with \overline{4}.. symmetry. The Si/Al statistical mixture occupies the site with .3. symmetry. The coordination polyhedra around the Li atoms are 13-vertex distorted pseudo-Frank–Kasper polyhedra. The environments of the Mg and Si/Al atoms are icosahedral. The hydrogen storage characteristics of Li12Mg3Si3Al were investigated. The reversible hydrogen storage capacity of the title compound is excellent and the gravimetric storage capacity of this new material, corresponding to 9.1 wt% H2, is higher compared to Li12Mg3Si4 (8.8 wt%). The enthalpy of hydrogen desorption is 86 kJ mol−1 and is lower compared to known lithium-based hydrides.

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