scholarly journals Improvement in Hydriding and Dehydriding Features of Mg–TaF5–VCl3 Alloy by Adding Ni and x wt% MgH2 (x = 1, 5, and 10) Together with TaF5 and VCl3

Micromachines ◽  
2021 ◽  
Vol 12 (10) ◽  
pp. 1194
Author(s):  
Young-Jun Kwak ◽  
Myoung-Youp Song
Keyword(s):  
Particle Size ◽  
Hydrogen Storage ◽  
Mechanical Milling ◽  
Storage Capacity ◽  
Reaction Rates ◽  
Cycling Performance ◽  
Hydrogen Storage Capacity ◽  
Effective Hydrogen

In our previous work, TaF5 and VCl3 were added to Mg, leading to the preparation of samples with good hydriding and dehydriding properties. In this work, Ni was added together with TaF5 and VCl3 to increase the reaction rates with hydrogen and the hydrogen-storage capacity of Mg. The addition of Ni together with TaF5 and VCl3 improved the hydriding and dehydriding properties of the TaF5 and VCl3-added Mg. MgH2 was also added with Ni, TaF5, and VCl3 and Mg-x wt% MgH2-1.25 wt% Ni-1.25 wt% TaF5-1.25 wt% VCl3 (x = 0, 1, 5, and 10) were prepared by reactive mechanical milling. The addition of MgH2 decreased the particle size, lowered the temperature at which hydrogen begins to release rapidly, and increased the hydriding and dehydriding rates for the first 5 min. Adding 1 and 5 wt% MgH2 increased the quantity of hydrogen absorbed for 60 min, Ha (60 min), and the quantity of hydrogen released for 60 min, Hd (60 min). The addition of MgH2 improved the hydriding–dehydriding cycling performance. Among the samples, the sample with x = 5 had the highest hydriding and dehydriding rates for the first 5 min and the best cycling performance, with an effective hydrogen-storage capacity of 6.65 wt%.

Synthesis, Hydrogenation and Mechanical Milling of Pseudo-Binary Zr(NbxV1-x)2 (0≤x≤0.65) Alloys

2008 ◽  
Vol 570 ◽  
pp. 45-51
Author(s):  
S.A. Loureiro ◽  
Daniel Fruchart ◽  
Sophie Rivoirard ◽  
Dílson S. dos Santos ◽  
L.M. Tavares
Keyword(s):  
Hydrogen Storage ◽  
Mechanical Milling ◽  
Storage Capacity ◽  
Molar Fraction ◽  
Partial Replacement ◽  
Miedema Model ◽  
Hydrogen Storage Capacity ◽  
Laves Phases ◽  
Processing Times ◽  
Iron Incorporation

AB2 metallic alloys provide large quantities of Laves phases when prepared using conventional thermal routes. In the present work the crystallography, hydrogenation behavior and mechanical milling (MM) effects of the pseudo-binary Zr(NbxV1-x)2 (0<x≤0.65) system are studied. It is found that the partial replacement of V by Nb atoms leads to the formation of cubic C15 (0<x≤0.20) and hexagonal C14 (0.35≤x≤0.65) Laves phases. For x≤0.20, the niobium additions promote a slight increase of the hydrogen storage capacity by the C15 phases. For 0.35≤x≤0.65, the reduction of the molar fraction of the C14 phase promotes an increase of the alloy hydrogen storage capability. Iron incorporation plays a major role on the type of final mechanically-milled Zr-Nb-V alloys obtained: a transformation from Laves phases (C14 and C15) to an fcc (Fm3m) one; while, in the absence of Fe, amorphization of the system was observed, as predicted by Miedema Model. As a general result, the mechanical milling of the Zr-Nb-V alloys results in a reduction of the hydrogen storage capacity, at least for long processing times.

FABRICATION AND HYDROGEN STORAGE PROPERTY OF Mg-3Ni-2MnO2-nCNTS NANOCOMPOSITES

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1467-1472
Author(s):  
HONG-FEI SUN ◽  
SHU-JIN LIANG ◽  
ZHENG-XING YU ◽  
WEN-BIN FANG
Keyword(s):  
Carbon Nanotubes ◽  
Hydrogen Storage ◽  
Mechanical Milling ◽  
Hydrogen Absorption ◽  
Storage Capacity ◽  
Kinetic Property ◽  
Milling Process ◽  
Hydrogen Storage Capacity ◽  
Result Show ◽  
Storage Property

Mg -3 Ni -2 MnO 2 hydrogen storage nanocomposites added with different composition (1%~4%) carbon nanotubes (CNTs) were prepared by mechanical milling under the atmosphere of hydrogen. Different mechanical milling process parameter has been discussed in this paper. Study on hydrogen storage ability of Mg -3 Ni -2 MnO 2- nCNTs with different composition carbon nanotubes has been carried out. The result show that Mg -3 Ni -2 MnO 2- nCNTs excellent heat conductivity and good hydrogen storage (more than 6%vol) ability, the CNTs improve the mass transfer and heat transfer properties of the Mg -3 Ni -2 MnO 2, thus enhancing the kinetic property of hydrogen absorption and desorption of the hydrogen storage nanocomposites, and raising the hydrogen storage capacity. Due to the addition of the carbon nanotubes, the milling stress in the process of preparing the Mg -based namocomposites is reduced, the components can be closely bonded easily, and the additives can play better catalytic roles enhancing the kinetic property of hydrogen absorption and desorption of the hydrogen storage nanocomposites, and raising the hydrogen storage capacity. Due to the addition of the carbon nanotubes, the milling stress in the process of preparing the Mg -based namocomposites is reduced, the components can be closely bonded easily, and the additives can play better catalytic roles.

scholarly journals Correction: Cigarette butt-derived carbons have ultra-high surface area and unprecedented hydrogen storage capacity

2021 ◽  
Author(s):  
L. Scott Blankenship
Keyword(s):  
Hydrogen Storage ◽  
Surface Area ◽  
Storage Capacity ◽  
High Surface ◽  
High Surface Area ◽  
Hydrogen Storage Capacity ◽  
Cigarette Butt ◽  
Energy Environ

Correction for ‘Cigarette butt-derived carbons have ultra-high surface area and unprecedented hydrogen storage capacity’ by L. Scott Blankenship et al., Energy Environ. Sci., 2017, 10, 2552–2562, DOI: 10.1039/C7EE02616A.

scholarly journals Enabling Storage and Utilization of Low-Carbon Electricity: Power to Formic Acid

2021 ◽  
Author(s):  
Kuo-Wei Huang ◽  
Sudipta Chatterjee ◽  
Indranil Dutta ◽  
Yanwei Lum ◽  
Zhiping Lai
Keyword(s):  
Hydrogen Storage ◽  
Formic Acid ◽  
Storage Capacity ◽  
Energy Carrier ◽  
Hydrogen Energy ◽  
Low Carbon ◽  
Hydrogen Storage Capacity ◽  
Electricity Power ◽  
Low Toxicity

Formic acid has been proposed as a hydrogen energy carrier because of its many desirable properties, such as low toxicity and flammability, and a high volumetric hydrogen storage capacity of...

Devitrification and hydrogen storage capacity of the eutectic Ca72Mg28 metallic glass

2017 ◽  
Vol 725 ◽  
pp. 916-922 ◽  
Author(s):  
K. Saksl ◽  
J. Ďurišin ◽  
D. Balga ◽  
O. Milkovič ◽  
T. Brestovič ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Hydrogen Storage ◽  
Storage Capacity ◽  
Hydrogen Storage Capacity

Mechanochemical synthesis of a Mg-Li-Al-H complex hydride

2009 ◽  
Vol 24 (9) ◽  
pp. 2880-2885 ◽  
Author(s):  
Jing Zhang ◽  
Wei Yan ◽  
Chenguang Bai ◽  
Fusheng Pan
Keyword(s):  
Solid Solution ◽  
Hydrogen Storage ◽  
Storage Capacity ◽  
Raw Materials ◽  
Initial Step ◽  
Hydrogen Atmosphere ◽  
Al Alloy ◽  
Hydrogen Storage Capacity ◽  
Scanning Calorimetry ◽  
Complex Hydride

Mg-Li-Al alloy was prepared by ingot casting and then underwent subsequent reactive ball milling. A Mg-Li-Al-H complex hydride was obtained under a 0.4 MPa hydrogen atmosphere at room temperature, and as high as 10.7 wt% hydrogen storage capacity was achieved, with the peak desorption temperature of the initial step at approximately 65 °C. The evolution of the reaction during milling, as well as the effect of Li/Al ratio in the raw materials on the desorption properties of the hydrides formed, were studied by x-ray diffraction and simultaneous thermogravimetry and differential scanning calorimetry techniques. The results showed that mechanical milling increases the solubility of Li in Mg, leading to the transformation of bcc β(Li) solid solution to hcp α(Mg) solid solution, the latter continues to incorporate Li and Al, which stimulates the formation of Mg-Li-Al-H hydride. A lower Li/Al ratio resulted in faster hydrogen desorption rate and a greater amount of hydrogen released at a low temperature range, but sacrificing total hydrogen storage capacity.

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