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Keywords = magnesium-iron hydride

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13 pages, 2936 KiB  
Article
New Insight on the Hydrogen Absorption Evolution of the Mg–Fe–H System under Equilibrium Conditions
by Julián Puszkiel, M. Victoria Castro Riglos, José M. Ramallo-López, Martin Mizrahi, Thomas Gemming, Claudio Pistidda, Pierre Arneodo Larochette, José Bellosta von Colbe, Thomas Klassen, Martin Dornheim and Fabiana Gennari
Metals 2018, 8(11), 967; https://doi.org/10.3390/met8110967 - 19 Nov 2018
Cited by 18 | Viewed by 4350
Abstract
Mg2FeH6 is regarded as potential hydrogen and thermochemical storage medium due to its high volumetric hydrogen (150 kg/m3) and energy (0.49 kWh/L) densities. In this work, the mechanism of formation of Mg2FeH6 under equilibrium conditions [...] Read more.
Mg2FeH6 is regarded as potential hydrogen and thermochemical storage medium due to its high volumetric hydrogen (150 kg/m3) and energy (0.49 kWh/L) densities. In this work, the mechanism of formation of Mg2FeH6 under equilibrium conditions is thoroughly investigated applying volumetric measurements, X-ray diffraction (XRD), X-ray absorption near edge structure (XANES), and the combination of scanning transmission electron microscopy (STEM) with energy-dispersive X-ray spectroscopy (EDS) and high-resolution transmission electron microscopy (HR-TEM). Starting from a 2Mg:Fe stoichiometric powder ratio, thorough characterizations of samples taken at different states upon hydrogenation under equilibrium conditions confirm that the formation mechanism of Mg2FeH6 occurs from elemental Mg and Fe by columnar nucleation of the complex hydride at boundaries of the Fe seeds. The formation of MgH2 is enhanced by the presence of Fe. However, MgH2 does not take part as intermediate for the formation of Mg2FeH6 and acts as solid-solid diffusion barrier which hinders the complete formation of Mg2FeH6. This work provides novel insight about the formation mechanism of Mg2FeH6. Full article
(This article belongs to the Special Issue Metals in Hydrogen Technology)
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12 pages, 1419 KiB  
Article
Mg2FeH6 Synthesis Efficiency Map
by Katarzyna Witek, Krzysztof Karczewski, Magdalena Karpowicz and Marek Polanski
Crystals 2018, 8(2), 94; https://doi.org/10.3390/cryst8020094 - 11 Feb 2018
Cited by 19 | Viewed by 5012
Abstract
The influences of the processing parameters on the Mg2FeH6 synthesis yield were studied. Mixtures of magnesium hydride (MgH2) and iron (Fe) were mechanically milled in a planetary ball mill under argon for 0.5-, 1-, 2- and 3-h periods [...] Read more.
The influences of the processing parameters on the Mg2FeH6 synthesis yield were studied. Mixtures of magnesium hydride (MgH2) and iron (Fe) were mechanically milled in a planetary ball mill under argon for 0.5-, 1-, 2- and 3-h periods and subsequently sintered at temperatures from 300–500 C under hydrogen. The reaction yield, phase content and hydrogen storage properties of the received materials were investigated. The morphologies of the powders after synthesis were studied by SEM. The synthesis effectiveness map was presented. The obtained results prove that synthesis parameters, such as the milling time and synthesis temperature, greatly influence the reaction yield and material properties and show that extended mechanical milling may not be beneficial to the reaction efficiency. Full article
(This article belongs to the Special Issue Properties and Applications of Novel Light Metal Hydrides)
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