scholarly journals Exploring the Hydrogen-Induced Amorphization and Hydrogen Storage Reversibility of Y(Sc)0.95Ni2 Laves Phase Compounds

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 276
Author(s):  
Shiqian Zhao ◽  
Hui Wang ◽  
Jiangwen Liu
Keyword(s):  
Hydrogen Storage ◽  
Time Pressure ◽  
Atomic Radius ◽  
Laves Phase ◽  
Hydrogen Storage Capacity ◽  
Dissociation Pressure ◽  
Hydrogen Storage Properties ◽  
Hydrogenation Time ◽  
Storage Properties ◽  
Laves Phase Compounds

Rare-earth-based AB2-type compounds with Laves phase structure are readily subject to hydrogen-induced amorphization and disproportionation upon hydrogenation. In this work, we conducted the Sc alloying on Y0.95Ni2 to improve its hydrogen storage properties. The results show that the amorphization degree of Y0.95Ni2 deepens with the increasing hydrogenation time, pressure, and temperature. The Y(Sc)0.95Ni2 ternary compounds show a significant improvement in reversibility and dehydriding thermodynamics due to the reduced atomic radius ratio RA/RB and cell volume. Hydrogen-induced amorphization is fully eliminated in the Y0.25Sc0.7Ni2. The Y0.25Sc0.7Ni2 delivers a reversible hydrogen storage capacity of 0.94 wt.% and the dissociation pressure of 0.095 MPa at the minimum dehydrogenation temperature of 100 °C.

Hydrogen storage properties of hexagonal C14 Laves phase Cu2Cd: A DFT study

2021 ◽  
Vol 304 ◽  
pp. 122560
Author(s):  
Nilanjan Roy ◽  
Saroj Kumari ◽  
Harshit ◽  
Partha P. Jana ◽  
Parag A. Deshpande
Keyword(s):  
Hydrogen Storage ◽  
Laves Phase ◽  
Dft Study ◽  
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.

ChemInform Abstract: Structure and Hydrogen Storage Properties of the Hexagonal Laves Phase Sc(Al1-xNix)2.

ChemInform ◽  
2013 ◽  
Vol 44 (4) ◽  
pp. no-no
Author(s):  
Martin Sahlberg ◽  
Jonas Aangstroem ◽  
Claudia Zlotea ◽  
Premysl Beran ◽  
Michel Latroche ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Laves Phase ◽  
Hydrogen Storage Properties ◽  
Abstract Structure ◽  
Storage Properties

Effect of MWCNTs on hydrogen storage properties of a Zr-based Laves phase alloy

2016 ◽  
Vol 41 (7) ◽  
pp. 4168-4176 ◽  
Author(s):  
Tiandong Wu ◽  
Xiangyi Xue ◽  
Tiebang Zhang ◽  
Rui Hu ◽  
Hongchao Kou ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Laves Phase ◽  
Hydrogen Storage Properties ◽  
Storage Properties

EFFECT OF TiO2 + Nb2O5 + TiH2 CATALYSTS ON HYDROGEN STORAGE PROPERTIES OF MAGNESIUM HYDRIDE

MRS Advances ◽  
2020 ◽  
Vol 5 (20) ◽  
pp. 1059-1069
Author(s):  
Ntumba Lobo ◽  
Alicja Klimkowicz ◽  
Akito Takasaki
Keyword(s):  
Activation Energy ◽  
Hydrogen Storage ◽  
Niobium Oxide ◽  
Magnesium Hydride ◽  
Kinetic Properties ◽  
Hydrogen Storage Capacity ◽  
Hydrogen Storage Properties ◽  
Kinetics Of ◽  
Storage Properties ◽  
Absorption Of Hydrogen

AbstractMagnesium hydride (MgH2) is a prospective material for the storage of hydrogen in solid materials. It can also be envisaged for thermal energy storage applications since it has the potential to reversibly absorb hydrogen in large quantities, theoretically up to 7.6% by weight. Also, MgH2 is inexpensive, abundant, and environmentally friendly, but it operates at relatively high temperatures, and the kinetics of the hydrogenation process is slow. Mechanical milling and the addition of catalyst can alter the activation energy and the kinetic properties of the MgH2 phase. It is known that the addition of titanium hydride (TiH2) lowers the enthalpy and enhances the absorption of hydrogen from MgH2, titanium oxide (TiO2) enhances the desorption of hydrogen and niobium oxide (Nb2O5) enhances the absorption of hydrogen. In this work, the influences of the catalysts, as mentioned above on the properties of MgH2, were studied. The samples were analyzed in terms of crystal and microstructure as well as hydrogen storage properties using a pressure-composition isotherm (PCT)measurement. It has been found that the simultaneous addition of the three catalysts enhances the properties of MgH2, lowers the activation energy and operating temperature, increases the rate of intake and release of hydrogen, and provides the largest gravimetric hydrogen storage capacity.

Microstructure and Hydrogen Storage Properties of Ti-V-Fe Alloys

2016 ◽  
Vol 847 ◽  
pp. 3-7 ◽  
Author(s):  
Gang Fu ◽  
Feng Wang ◽  
Jiang Wang ◽  
Mao Hua Rong ◽  
Zhong Min Wang ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Secondary Phase ◽  
Hydrogen Desorption ◽  
Laves Phase ◽  
Thermal Stabilities ◽  
Hydrogen Storage Properties ◽  
Dsc Measurements ◽  
Arc Melting ◽  
Fe Alloys ◽  
Storage Properties

Microstructure, hydrogen storage properties and thermal stabilities of V-Ti-Fe alloys prepared by arc-melting were studied in this work. It was confirmed that V60Ti30Fe10, V70Ti20Fe10 and V80Ti10Fe10 alloys are a body-centered cubic (bcc) single phase, while V75Ti10Fe15 alloy consists of the bcc main phase and C14-typed Laves secondary phase. Experimental results show that the V80Ti10Fe10 alloy reached the largest hydrogen absorption capacities which were about 1.9 wt.% and 1.62 wt.% at 423 K and 473 K, while V75Ti10Fe15 alloy with C14-typed Laves phase showed better hydrogen desorption capacities with 1.31 wt.% at 423 K and 1.35 wt.% at 473 K, respectively. In addition, the DSC measurements indicate that the thermal stability of V75Ti10Fe15 alloy with C14-typed Laves phase decreased, which is very beneficial to the improvement of dehydrogenation rate in the alloy.

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.

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