Dependence of Structural Evolution an Hydrogen Storage Mechanism on Milling Parameters during controlled Reactive Milling of Graphite in Hydrogen

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%.

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Synthesis of MgH2 and Mg2FeH6 by Reactive Milling of Mg-Based Mixtures Containing Fluorine and Iron

Materials Science Forum ◽

10.4028/www.scientific.net/msf.570.39 ◽

2008 ◽

Vol 570 ◽

pp. 39-44 ◽

Cited By ~ 15

Author(s):

Antoine Vaichere ◽

Daniel Rodrigo Leiva ◽

Tomaz Toshimi Ishikawa ◽

Walter José Botta Filho

Keyword(s):

Hydrogen Storage ◽

Phase Evolution ◽

Good Method ◽

Planetary Mill ◽

Hydrogen Storage Capacity ◽

High Hydrogen ◽

Reactive Milling ◽

Low Weight ◽

Hydrogen Reactions ◽

Kinetics Of

A good method to store hydrogen is in it atomic form in crystalline structure of metals at low pressure. Thanks to magnesium’s high hydrogen storage capacity, its low weight and its high natural abundance, it is an attractive material to develop hydrogen solid state storage. The production of Mg-based nanocomposites can enhance the kinetics of H-sorption of magnesium and the temperature of release of hydrogen. Transition metals as iron, which have important catalytic activity in hydrogen reactions with Mg, and the surface protective compound MgF2, are interesting additions for magnesium mixtures for hydrogen storage. In this work, Mg-based nanocomposites containing Fe and MgF2 were produced by reactive milling under hydrogen using the addition of FeF3, or directly MgF2 and Fe. The efficiency of centrifugal and planetary mill in MgH2 synthesis was compared. The phase evolution during different milling times (from 1 to 96 h) using the planetary was investigated. The different H-desorption behavior of selected milled mixtures was studied and associated with the different present phases in each case.

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.724-725.1021 ◽

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.

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Muon spin relaxation reveals the hydrogen storage mechanism in light alkali metal fullerides

Carbon ◽

10.1016/j.carbon.2013.09.063 ◽

2014 ◽

Vol 67 ◽

pp. 92-97 ◽

Cited By ~ 19

Author(s):

M. Aramini ◽

M. Gaboardi ◽

G. Vlahopoulou ◽

D. Pontiroli ◽

C. Cavallari ◽

...

Keyword(s):

Alkali Metal ◽

Hydrogen Storage ◽

Spin Relaxation ◽

Muon Spin ◽

Muon Spin Relaxation ◽

Storage Mechanism

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A reversible hydrogen storage mechanism for sodium alanate: the role of alanes and the catalytic effect of the dopant

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2004.04.155 ◽

2004 ◽

Vol 379 (1-2) ◽

pp. 135-142 ◽

Cited By ~ 50

Author(s):

R. Tom Walters ◽

John H. Scogin

Keyword(s):

Hydrogen Storage ◽

Catalytic Effect ◽

Storage Mechanism ◽

Sodium Alanate

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Studies of Hydrogen Storage Mechanism with High Intensity Neutron Total Scattering

Materia Japan ◽

10.2320/materia.52.346 ◽

2013 ◽

Vol 52 (7) ◽

pp. 346-349

Author(s):

Toshiya Otomo ◽

Kazutaka Ikdeda ◽

Hidetoshi Ohshita ◽

Kentaro Suzuya

Keyword(s):

Hydrogen Storage ◽

High Intensity ◽

Total Scattering ◽

Storage Mechanism ◽

Neutron Total Scattering

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Investigation of Polyaniline Nanocomposites and Cross-Linked Polyaniline for Hydrogen Storage

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.445.571 ◽

2012 ◽

Vol 445 ◽

pp. 571-576 ◽

Cited By ~ 4

Author(s):

Dervis E. Demirocak ◽

Sarada Kuravi ◽

Manoj K. Ram ◽

Chand K. Jotshi ◽

Sesha Srinivasan ◽

...

Keyword(s):

Hydrogen Storage ◽

Surface Area ◽

Storage Capacity ◽

Storage System ◽

High Surface ◽

High Surface Area ◽

Hydrogen Sorption ◽

Commercial Application ◽

Storage Mechanism ◽

Hydrogen Storage System

One of the biggest challenges for the commercial application of existing hydrogen storage materials is to meet the desired high volumetric and gravimetric hydrogen storage capacity and the ability to refuel quickly and repetitively as a safe transportation system at moderate temperature and pressure. In this work, we have synthesized polyaniline nanocomposites (PANI-NC) and hypercrosslinked polyaniline (PANI-HYP) materials to provide structure and composition which could meet the specific demands of a practical hydrogen storage system. Hydrogen sorption measurements showed that high surface area porous structure enhanced the storage capacity significantly at 77.3K and 1atm (i.e., 0.8wt% for PANI-HYP). However at 298K, storage capacity of all samples is less than 0.5wt% at 70 bar. Hydrogen sorption results along with the surface area measurements confirmed that hydrogen storage mechanism predominantly based on physisorption for polyaniline.

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