Preparation of La-Mg-Ni Hydrogen Storage Composite Alloys by Mechanical Alloying

2013 ◽  
Vol 807-809 ◽  
pp. 2707-2712 ◽  
Author(s):  
Shi Jian Yan ◽  
Xin Wei Zou ◽  
Min Gang Zhang
Keyword(s):  
Hydrogen Storage ◽  
Mechanical Alloying ◽  
Ball Milling ◽  
Metal Powder ◽  
Hydrogen Desorption ◽  
Hydrogen Atmosphere ◽  
Hydrogen Storage Alloys ◽  
Milling Parameters ◽  
Multi Phase ◽  
Mg Content

LaNi5-xwt%Mg hydrogen storage alloys with different Mg content were made from pure La, Mg and Ni metal powder by mechanical alloying, selecting appropriate ball-milling parameters in 0.4MPa hydrogen atmosphere. The characterizations for hydrogen storage alloy show that a multi-phase alloy composed of MgH2, LaH3, Mg2NiH4 and Ni was obtained, the alloy have two hydrogen desorption temperature range, and the alloy with 25wt% Mg content can desorb hydrogen up to 4.02wt%.

Crystallitic Structure and Thermodynamics of Magnesium-Based Hydrogen Storage Materials from Reactive Milling under Hydrogen Atmosphere

2013 ◽  
Vol 724-725 ◽  
pp. 1021-1024
Author(s):  
Shi Xue Zhou ◽  
Qian Qian Zhang ◽  
Nai Fei Wang ◽  
Zong Ying Han ◽  
Wei Xian Ran ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Xrd Analysis ◽  
Hydrogen Desorption ◽  
Hydrogen Atmosphere ◽  
Hydrogen Storage Materials ◽  
Storage Materials ◽  
Reactive Milling ◽  
Anthracite Coal ◽  
Enthalpy And Entropy Changes ◽  
Hoff Equation

Magnesium-based hydrogen storage materials were prepared by reactive milling of magnesium under hydrogen atmosphere with crystallitic carbon, prepared from anthracite coal, as milling aid. The XRD analysis shows that in the presence of 30 wt.% of crystallitic carbon, the Mg easily hydrided into β-MgH2of crystal grain size 29.7 nm and a small amount of γ-MgH2after 3 h of milling under 1 MPa H2. The enthalpy and entropy changes of the hydrogen desorption reaction are 42.7 kJ/mol and 80.7 J/mol K, respectively, calculated by the vant Hoff equation from thep-C-Tdata in 300-380°C.

Enhanced hydrogen sorption capacities and kinetics of Mg2Ni alloys by ball-milling with carbon and Pd coating

2003 ◽  
Vol 18 (8) ◽  
pp. 1749-1752 ◽  
Author(s):  
R. Janot ◽  
L. Aymard ◽  
A. Rougier ◽  
G. A. Nazri ◽  
J. M. Tarascon
Keyword(s):  
Ball Milling ◽  
Surface Composition ◽  
Chemical Deposition ◽  
Practical Method ◽  
Hydrogen Desorption ◽  
Hydrogen Storage Alloys ◽  
Alloy Particles ◽  
Ni Alloy ◽  
Kinetics Of ◽  
Determinant Factor

Solid-state hydrogen storage alloys are becoming a practical method to transport and utilize hydrogen as fuel for various technologies. In this paper, the kinetics and capacity of hydrogen desorption from Mg-based alloys have markedly been enhanced by tuning the surface composition of alloy particles. Mg2Ni–Ct, x composites (where t refers to the pregrinding time and x to the Brunauer–Emmet–Teller specific surface area) were prepared by ball-milling the alloy in the presence of preground graphite, and Pd-coated Mg2Ni alloy powders were obtained by controlled chemical deposition of Pd on the alloy surface. We have found that the optimization of the pregrinding step of carbon is a determinant factor in enhancing the hydrogen desorption capacity of the Mg2Ni–10 wt.% C10,320 composites to 2.6 wt.% at 150 °C, the maximum performance so far reported on desorption for Mg-based alloys. Such value can even be raised to 2.8 wt.% by applying Pd deposition on the composite.

scholarly journals Microstructure and Hydrogen Storage Properties of the Multiphase Ti0.3V0.3Mn0.2Fe0.1Ni0.1 Alloy

Reactions ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 287-300
Author(s):  
Salma Sleiman ◽  
Maria Moussa ◽  
Jacques Huot
Keyword(s):  
Hydrogen Storage ◽  
Mechanical Alloying ◽  
Ball Milling ◽  
Raw Materials ◽  
Cast Alloy ◽  
Hydrogen Storage Properties ◽  
Arc Melting ◽  
Bcc Structure ◽  
The One ◽  
Storage Properties

The hydrogen storage properties of a multi-component alloy of composition Ti0.3V0.3Mn0.2Fe0.1Ni0.1 were investigated. The alloy was synthesized by arc melting and mechanical alloying, resulting in different microstructures. It was found that the as-cast alloy is multiphase, with a main C14 Laves phase matrix along with a BCC phase and a small amount of Ti2Fe-type phase. The maximum hydrogen storage capacity of the alloy was 1.6 wt.%. We found that the air-exposed samples had the same capacity as the as-cast sample but with a longer incubation time. Synthesis by mechanical alloying for five hours resulted in an alloy with only BCC structure. The hydrogen capacity of the milled alloy was 1.2 wt.%, lower than the as-cast one. The effect of ball milling of the as-cast alloy was also studied. Ball milling for five hours produced a BCC structure similar to the one obtained by milling the raw materials for the same time.

Hydrogen Storage Properties of LiNH2/MgH2 Complex Materials with Ti Catalyst by Mechanical Alloying

2014 ◽  
Vol 898 ◽  
pp. 93-97 ◽  
Author(s):  
Zhi Qiang Lan ◽  
Song Liu ◽  
Shu Bo Li ◽  
Wen Lou Wei ◽  
Jin Guo
Keyword(s):  
Hydrogen Storage ◽  
Mechanical Alloying ◽  
Hydrogen Desorption ◽  
Onset Temperature ◽  
Complex Materials ◽  
Mill Time ◽  
Hydrogen Storage Properties ◽  
Hydrogen Saturation ◽  
Saturation Absorption ◽  
Storage Properties

A LiNH2/MgH2 (1:1) complex was prepared by mechanical alloying and the effects of Ti and TiF3 on the characteristics of hydrogen storage were investigated. It was found that LiMgN and Li2NH phases exist as the main phases in the LiNH2/MgH2 (1:1) complex and that Mg (NH2)2 and NH4HF2 phases appear when TiF3 is added. The onset temperature of hydrogen desorption was reduced with increasing mill time, and the hydrogen saturation absorption temperature for the LiNH2/MgH2 complex decreased about 30°C with the addition of Ti and TiF3. Ti and TiF3 as catalysts are favorable for reducing the dehydrogenation temperature. The addition of TiF3 can also facilitate the increase of hydrogen desorption for the LiNH2/MgH2 (1:1) complex.

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