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Littérature scientifique sur le sujet « Mg2FeH6 »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Mg2FeH6"

Leiva, Daniel Rodrigo, André Castro De Souza Villela, Carlos de Oliveira Paiva-Santos, Daniel Fruchart, Salvatore Miraglia, Tomaz Toshimi Ishikawa et Walter José Botta Filho. « High-Yield Direct Synthesis of Mg₂FeH₆ from the Elements by Reactive Milling ». Solid State Phenomena 170 (avril 2011) : 259–62. http://dx.doi.org/10.4028/www.scientific.net/ssp.170.259.

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Magnesium complex hydrides as Mg2FeH6 are interesting phases for hydrogen storage in the solid state, mainly due to its high gravimetric and volumetric densities of H2. However, the synthesis of this hydride is not trivial because the intermetallic phase Mg2Fe does not exist and Mg and Fe are virtually immiscible under equilibrium conditions. In this study, we have systematically studied the influence of the most important processing parameters in reactive milling under hydrogen (RM) for Mg2FeH6 synthesis: milling time, ball-to-powder weight ratio (BPR), hydrogen pressure and type of mill. Low cost 2Mg-Fe mixtures were used as raw materials. An important control of the Mg2FeH6 direct synthesis by RM was attained. In optimized combinations of the processing parameters, very high proportions of the complex hydride could be obtained.

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De Lima, Gisele Ferreira, Daniel Rodrigo Leiva, Tomaz Toshimi Ishikawa, Claudemiro Bolfarini, Claudio Shyinti Kiminami, Walter José Botta Filho et Alberto Moreira Jorge. « Hydrogen Sorption Properties of the Complex Hydride Mg₂FeH₆ Consolidated by HPT ». Materials Science Forum 667-669 (décembre 2010) : 1053–58. http://dx.doi.org/10.4028/www.scientific.net/msf.667-669.1053.

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In the present work, we have processed 2Mg-Fe mixtures by reactive milling (RM) under hydrogen atmosphere to synthesize Mg2FeH6 phase in the powder form which were then systematically processed by High Pressure Torsion (HPT) to produce bulk samples. The bulk samples were characterized in terms of microstructural and structural analyses and of hydrogen desorption properties. The hydrogen sorption properties after HPT processing was evaluated in comparison with the Mg2FeH6 powder obtained by RM and with commercial MgH2. HPT processing of Mg2FeH6 can produce bulks with a high density of defects that drastically lower the activation barrier for hydrogen desorption. Therefore, the bulk nanocrystalline Mg2FeH6 samples show endothermic hydrogen decomposition peak at a temperature around 320°C. In addition, when compared with the Mg2FeH6 and MgH2 powders, the Mg2FeH6 HPT disks showed the same results presented by the Mg2FeH6 powders and certainly decreases the onset transition temperature by as much as 160°C when compared with the MgH2 powders.

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Puszkiel, Julián, M. Castro Riglos, José Ramallo-López, Martin Mizrahi, Thomas Gemming, Claudio Pistidda, Pierre Arneodo Larochette et al. « New Insight on the Hydrogen Absorption Evolution of the Mg–Fe–H System under Equilibrium Conditions ». Metals 8, n^o 11 (19 novembre 2018) : 967. http://dx.doi.org/10.3390/met8110967.

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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.

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Brutti, Sergio, Luca Farina, Francesco Trequattrini, Oriele Palumbo, Priscilla Reale, Laura Silvestri, Stefania Panero et Annalisa Paolone. « Extremely Pure Mg2FeH6 as a Negative Electrode for Lithium Batteries ». Energies 11, n^o 8 (27 juillet 2018) : 1952. http://dx.doi.org/10.3390/en11081952.

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Nanocrystalline samples of Mg-Fe-H were synthesized by mixing of MgH2 and Fe in a 2:1 molar ratio by hand grinding (MIX) or by reactive ball milling (RBM) in a high-pressure vial. Hydrogenation procedures were performed at various temperatures in order to promote the full conversion to Mg2FeH6. Pure Mg2FeH6 was obtained only for the RBM material cycled at 485 °C. This extremely pure Mg2FeH6 sample was investigated as an anode for lithium batteries. The reversible electrochemical lithium incorporation and de-incorporation reactions were analyzed in view of thermodynamic evaluations, potentiodynamic cycling with galvanostatic acceleration (PCGA), and ex situ X-ray Diffraction (XRD) tests. The Mg2FeH6 phase underwent a conversion reaction; the Mg metal produced in this reaction was alloyed upon further reduction. The back conversion reaction in a lithium cell was here demonstrated for the first time in a stoichiometric extremely pure Mg2FeH6 phase: the reversibility of the overall conversion process was only partial with an overall coulombic yield of 17% under quasi-thermodynamic control. Ex situ XRD analysis highlighted that the material after a full discharge/charge in a lithium cell was strongly amorphized. Under galvanostatic cycling at C/20, C/5 and 1 C, the Mg2FeH6 electrodes were able to supply a reversible capacity with increasing coulombic efficiency and decreasing specific capacity as the current rate increased.

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Langmi, Henrietta W., G. Sean McGrady, Rebecca Newhouse et Ewa Rönnebro. « Mg2FeH6–LiBH4 and Mg2FeH6–LiNH2 composite materials for hydrogen storage ». International Journal of Hydrogen Energy 37, n^o 8 (avril 2012) : 6694–99. http://dx.doi.org/10.1016/j.ijhydene.2012.01.020.

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Ghaani, Mohammad R., Michele Catti et Niall J. English. « In Situ Synchrotron X-ray Diffraction Studies of Hydrogen-Desorption Properties of 2LiBH4–Mg2FeH6 Composite ». Molecules 26, n^o 16 (11 août 2021) : 4853. http://dx.doi.org/10.3390/molecules26164853.

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Adding a secondary complex metal hydride can either kinetically or thermodynamically facilitate dehydrogenation reactions. Adding Mg2FeH6 to LiBH4 is energetically favoured, since FeB and MgB2 are formed as stable intermediate compounds during dehydrogenation reactions. Such “hydride destabilisation” enhances H2-release thermodynamics from H2-storage materials. Samples of the LiBH4 and Mg2FeH6 with a 2:1 molar ratio were mixed and decomposed under three different conditions (dynamic decomposition under vacuum, dynamic decomposition under a hydrogen atmosphere, and isothermal decomposition). In situ synchrotron X-ray diffraction results revealed the influence of decomposition conditions on the selected reaction path. Dynamic decomposition of Mg2FeH6–LiBH4 under vacuum, or isothermal decomposition at low temperatures, was found to induce pure decomposition of LiBH4, whilst mixed decomposition of LiBH4 + Mg and formation of MgB2 were achieved via high-temperature isothermal dehydrogenation.

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PARKER, S. F., K. P. J. WILLIAMS, M. BORTZ et K. YVON. « ChemInform Abstract : Inelastic Neutron Scattering, Infrared, and Raman Spectroscopic Studies of Mg2FeH6 and Mg2FeD6. » ChemInform 29, n^o 5 (24 juin 2010) : no. http://dx.doi.org/10.1002/chin.199805010.

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Polanski, M., T. Płociński, I. Kunce et J. Bystrzycki. « Dynamic synthesis of ternary Mg2FeH6 ». International Journal of Hydrogen Energy 35, n^o 3 (février 2010) : 1257–66. http://dx.doi.org/10.1016/j.ijhydene.2009.09.010.

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Malka, Iwona, Tomasz Czujko, Jerzy Bystrzycki et Leszek Jaroszewicz. « The role of Mg2FeH6 formation on the hydrogenation properties of MgH2-FeFx composites ». Open Chemistry 9, n^o 4 (1 août 2011) : 701–5. http://dx.doi.org/10.2478/s11532-011-0051-5.

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AbstractThe hydrogenation properties of magnesium hydride mechanically milled with iron fluorides (FeF2 and FeF3), were investigated by Temperature Programmed Desorption (TPD) and volumetric methods using a Sieverts-type apparatus, as prepared upon dehydrogenation and finally upon subsequent hydrogenation. The activation energy of hydrogen desorption (Ea), calculated from the Kissinger formula using TPD measurements obtained with different heating rates, showed significant decreases of Ea in comparison to that of milled MgH2 without any dopants. Moreover, the influence of these metal fluorides on the thermodynamics of the decomposition process was also examined. In the case of the FeF2 dopant, rehydrogenation following desorption caused the complete decomposition of the iron fluoride to BCC iron and the formation of a predominant MgH2 phase. In contrast to FeF2, the addition of FeF3 led to the formation of β-MgH2 as a major phase coexisting with Mg2FeH6 and MgF2 compounds. The presence of pure Fe in the MgH2+FeF2 composite, as opposed to MgH2+FeF3 containing Mg2FeH6 and MgF2, did not cause any significant influence on the sorption properties of MgH2. Moreover, the original material doped with FeF3 predominantly showed iron in the Mg2FeH6 compound, while the FeF2 dopant iron mostly showed the nearly pure BCC metallic phase

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Wang, Yan, Fangyi Cheng, Chunsheng Li, Zhanliang Tao et Jun Chen. « Preparation and characterization of nanocrystalline Mg2FeH6 ». Journal of Alloys and Compounds 508, n^o 2 (octobre 2010) : 554–58. http://dx.doi.org/10.1016/j.jallcom.2010.08.119.

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Thèses sur le sujet "Mg2FeH6"

GHAANI, MOHAMMAD REZA. « Study of new materials and their functionality for hydrogen storage and other energy applications ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2014. http://hdl.handle.net/10281/49808.

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The first part of this thesis deals with hydrogen storage materials, in view of their applications as promising energy carriers. One of the main open problems with these materials is: how can their decomposition temperature be lowered, when hydrogen is wanted to be released, so as to improve the energy efficiency of the process. A possible answer is given by joint decomposition of two or more hydrides, if very stable mixed compounds are formed (‘hydride destabilization’). Aiming at this result, the new hydride composite 2LiBH4-Mg2FeH6 was considered, it was synthesized, and its thermodynamic and kinetic properties were investigated. In the second part of this thesis work lithium oxide materials, of relevant interest for applications to batteries, were investigated. The chemical lithiation reaction of niobium oxide was considered, as equivalent to the electrochemical process of lithium insertion on discharging a Nb2O5 cathode vs. a metal Li anode. Thus, the Li2Nb2O5 compound was synthesized by reaction of monoclinic a-Nb2O5 with n-butyllithium.This material was investigated by neutron powder diffraction (D2B equipment at ILL, France) and its structure was Rietveld refined in space group P2 to wRp=0.045, locating the Li atoms inserted in the a-Nb2O5 framework.

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Chapitres de livres sur le sujet "Mg2FeH6"

Bogdanović, B., K. Schlichte et A. Reiser. « Thermodynamic Properties and Cyclic-Stability of the System Mg2FeH6 ». Dans Hydrogen Power : Theoretical and Engineering Solutions, 291–96. Dordrecht : Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-015-9054-9_37.

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Actes de conférences sur le sujet "Mg2FeH6"

Kim, Juyoung. « Dehydrogenation Kinetics of Mg2FeH6 by In-situ Transmission Electron Microscopy ». Dans European Microscopy Congress 2020. Royal Microscopical Society, 2021. http://dx.doi.org/10.22443/rms.emc2020.303.

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