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Littérature scientifique sur le sujet « Magnesium borohydride »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Magnesium borohydride"

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Castilla-Martinez, Carlos A., Romain Moury, Salem Ould-Amara et Umit B. Demirci. « Destabilization of Boron-Based Compounds for Hydrogen Storage in the Solid-State : Recent Advances ». Energies 14, n^o 21 (26 octobre 2021) : 7003. http://dx.doi.org/10.3390/en14217003.

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Boron-based materials have been widely studied for hydrogen storage applications. Examples of these compounds are borohydrides and boranes. However, all of these present some disadvantages that have hindered their potential application as hydrogen storage materials in the solid-state. Thus, different strategies have been developed to improve the dehydrogenation properties of these materials. The purpose of this review is to provide an overview of recent advances (for the period 2015–2021) in the destabilization strategies that have been considered for selected boron-based compounds. With this aim, we selected seven of the most investigated boron-based compounds for hydrogen storage applications: lithium borohydride, sodium borohydride, magnesium borohydride, calcium borohydride, ammonia borane, hydrazine borane and hydrazine bisborane. The destabilization strategies include the use of additives, the chemical modification and the nanosizing of these compounds. These approaches were analyzed for each one of the selected boron-based compounds and these are discussed in the present review.

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Hino, Satoshi, Jon Erling Fonneløp, Marta Corno, Olena Zavorotynska, Alessandro Damin, Bo Richter, Marcello Baricco, Torben R. Jensen, Magnus H. Sørby et Bjørn C. Hauback. « Halide Substitution in Magnesium Borohydride ». Journal of Physical Chemistry C 116, n^o 23 (juin 2012) : 12482–88. http://dx.doi.org/10.1021/jp303123q.

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Soloveichik, Grigorii L., Matthew Andrus et Emil B. Lobkovsky. « Magnesium Borohydride Complexed by Tetramethylethylenediamine ». Inorganic Chemistry 46, n^o 10 (mai 2007) : 3790–91. http://dx.doi.org/10.1021/ic700376n.

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Richter, Bo, Dorthe B. Ravnsbæk, Nikolay Tumanov, Yaroslav Filinchuk et Torben R. Jensen. « Manganese borohydride ; synthesis and characterization ». Dalton Transactions 44, n^o 9 (2015) : 3988–96. http://dx.doi.org/10.1039/c4dt03501a.

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Mohtadi, Rana, Masaki Matsui, Timothy S. Arthur et Son-Jong Hwang. « Magnesium Borohydride : From Hydrogen Storage to Magnesium Battery ». Angewandte Chemie International Edition 51, n^o 39 (21 août 2012) : 9780–83. http://dx.doi.org/10.1002/anie.201204913.

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Mohtadi, Rana, Masaki Matsui, Timothy S. Arthur et Son-Jong Hwang. « Magnesium Borohydride : From Hydrogen Storage to Magnesium Battery ». Angewandte Chemie 124, n^o 39 (21 août 2012) : 9918–21. http://dx.doi.org/10.1002/ange.201204913.

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Kisu, Kazuaki, Sangryun Kim, Munehiro Inukai, Hiroyuki Oguchi, Shigeyuki Takagi et Shin-ichi Orimo. « Magnesium Borohydride Ammonia Borane as a Magnesium Ionic Conductor ». ACS Applied Energy Materials 3, n^o 4 (31 mars 2020) : 3174–79. http://dx.doi.org/10.1021/acsaem.0c00113.

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Dematteis, Erika M., et Marcello Baricco. « Hydrogen Desorption in Mg(BH4)2-Ca(BH4)2 System ». Energies 12, n^o 17 (22 août 2019) : 3230. http://dx.doi.org/10.3390/en12173230.

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Magnesium borohydride, Mg(BH4)2, and calcium borohydride, Ca(BH4)2, are promising materials for hydrogen storage. Mixtures of different borohydrides have been the subject of numerous researches; however, the whole Mg(BH4)2-Ca(BH4)2 system has not been investigated yet. In this study, the phase stability and the hydrogen desorption were experimentally investigated in the Mg(BH4)2-Ca(BH4)2 system, by means of XRD, ATR-IR, and HP-DSC. Mg(BH4)2 and Ca(BH4)2 are fully immiscible in the solid state. In the mechanical mixtures, thermal decomposition occurs at slightly lower temperatures than for pure compounds. However, they originate products that cannot be identified by XRD, apart from Mg and MgH2. In fact, amorphous phases or mixtures of different poorly crystalline or nanocrystalline phases are formed, leading to a limited reversibility of the system.

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Shane, David T., Laura H. Rayhel, Zhenguo Huang, Ji-Cheng Zhao, Xia Tang, Vitalie Stavila et Mark S. Conradi. « Comprehensive NMR Study of Magnesium Borohydride ». Journal of Physical Chemistry C 115, n^o 7 (28 janvier 2011) : 3172–77. http://dx.doi.org/10.1021/jp110762s.

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Saldan, Ivan. « Decomposition and formation of magnesium borohydride ». International Journal of Hydrogen Energy 41, n^o 26 (juillet 2016) : 11201–24. http://dx.doi.org/10.1016/j.ijhydene.2016.05.062.

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Thèses sur le sujet "Magnesium borohydride"

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Akyol, Emel Özgen Tamerkan. « Synthesis of Magnesium Hydride And Sodium Borohydride At Low Temperatures/ ». [s.l.] : [s.n.], 2006. http://library.iyte.edu.tr/tezlerengelli/master/kimya/T000567.pdf.

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NALE, ANGELOCLAUDIO. « Synthesis and characterization of Mg-Al-Ni alloys and Li-Mg borohydrides for hydrogen storage ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2011. http://hdl.handle.net/10281/19621.

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Two important classes of hydrogen storage materials were considered: metallic alloys and molecular borohydrides. Each of them has advantages and disadvantages. Alloys absorb and release hydrogen reversibly and promptly, but in relatively small amount, whereas borohydrides decompose irreversibly yielding over 10 wt% of H2. Two systems of suitable chemical composition were selected from such classes, and materials belonging to them were synthesized and characterized from the structural and thermal point of view; the detailed and thorough experiments of dehydrogenation were performed on them, in order to determine the thermodynamic and kinetic aspects of the hydrogen release. Within metallic alloys, the Mg-Al-Ni was selected to study the addition of Al to the Mg-Ni system. Samples with MgmAlNin composition (m,n <= 3) were synthesized by ball milling; by X-ray di raction studies, they were found to be a basically single phase with substitutionally disordered CsCl-type cubic structure. Only compositions with m large and n small proved to segregate minor quantities of Mg and Mg2Ni. Hydrogenation experiments on the Mg2AlNi2 sample by the PCI technique (Sievert apparatus) showed a reversible absorption/desorption of 1.4 wt% H2 with formation / decomposition of the MgH2 and Mg2NiH4 hydrides. A particularly favourable dehydrogenation temperature (T >= 531 K for p >= 1 bar) was observed, by comparison with those of the single phase hydrides. Also the kinetics of the gas release proved to be satisfactory, indicating that addition of Al improves the H-storage performance of the Mg-Ni alloy substantially. The mixed LiBH4-Mg(BH4)2 borohydride system was investigated, to determine its possible better performance as hydrogen storage material with respect to the end-members pure borohydrides. Several composites were synthesized by ball milling, namely xLiBH4-(1-x)Mg(BH4)2 with x = 0, 0.10, 0.25, 0.33, 0.40, 0.50, 0.60, 0.66, 0.75, 0.80, 0.90, 1. The physical mixture was investigated by using X- ray powder di raction and thermal analysis. Interestingly, already a small amount of LiBH4 proved to make the alpha to beta transition of Mg(BH4)2 reversible, which had not been reported before. The eutectic composition was found to exist at 0.50 < x < 0.60, exhibiting a eutectic melting at 180 °C. A phase diagram was built based on the data obtained in this study. Furthermore, the decomposition of the material begins right after the melting; thus the decomposition temperature of the composite is much lower than those of the pure borohydrides. At 270 °C the x = 0.50 composite releases about 7.0 wt% of hydrogen. A full thermodynamic study of the dehydrogenation reaction was performed (Sievert apparatus) on the eutectic mixture, 0.6LiBH4-0.4Mg(BH4)2, and on the end members LiBH4 and Mg(BH4)2. Both the dynamic technique (constant pressure, temperature ramp vs. time) and the equilibrium mode (constant temperature, variable pressure with waiting time for pressure equilibration) were employed to measure the wt% of H2 released. It was found that the decomposition behavior of the eutectic composite is quite similar to that of Mg(BH4)2, but the starting temperature of the process is substantially lower, as shown by DSC measurements, opening the way to possible applications. With the help of Van't Hoff plots and by comparison with literature data, it was possible to analyze the dehydrogenation mechanism of the eutectic composite in terms of four steps, implying the intermediate formation of MgH2. Lithium borohydride proved to play an important role in assisting the fi nal decomposition of MgH2.

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Afonso, Louis Greg. « Studies of hydrogen storage in the sodium borohydride and magnesium nickel hydride composite system ». Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/43802.

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Complex metal hydrides typically have high enthalpies which lead to desorption temperatures that are too high for practical use. Thermodynamic destabilization is one method used to lower the enthalpy of decomposition and hence lower the temperature of desorption of a complex metal hydride. A lower temperature (less than 100ºC) would enable waste heat from a PEM(Polymer Electrolyte Membrane) fuel cell to drive the hydrogen desorption reaction. NaBH₄ was destabilized by ball milling NaBH₄ and Mg₂NiH₄ in a 4:5 molar ratio, respectively. Ball milling periods of up to 2 hours did not have an effect on the thermodynamics or the kinetics of the system. Grain sizes of the two phases, NaBH₄ and Mg₂NiH₄, were reduced during the first 30 minutes of ball milling. The decomposition enthalpy of the system was measured and found to be 67 ± 4 kJ mol⁻¹ H₂ for the decomposition of Mg₂NiH₄ in the composite, 76 ± 5 kJ mol⁻¹ for the decomposition of NaBH₄ and 95 ± 7 kJ mol⁻¹ H₂ for the decomposition of NaH, which corresponds to measured desorptions at 275, 360 and 420 ºC respectively. The enthalpy of absorption corresponding to Mg₂NiH₄ in the composite was 59 ± 4 kJ mol⁻¹ H₂ . During dehydrogenation of the NaBH₄ phase, the ternary boride phase MgNi₂.₅B₂ is formed under a hydrogen back pressure of vacuum, 1 bar and 5 bar. The total capacity of the system is 5.1 wt%, and a capacity loss of 2.25 wt% hydrogen was noted during cycling studies partially due to the formation of MgNi₂, which is a nonhydriding phase, loss of Na from the sample holder, and the formation of large crystals of Mg that could not be hydrogenated easily. Kinetic analysis was conducted and an activation energy of 131 ± 24 kJ mol⁻¹ was determined for the decomposition of the Mg₂NiH₄ phase of the composite. XRD phase analysis showed that the Mg₂NiH₄ decomposed first starting at about 275 ºC, followed by the decomposition of NaBH₄ at around 360 ºC. By 400 ºC, XRD analysis showed that the MgNi₂.₅B₂ phase had formed. The effect of cycling on the crystallographic phases showed a change from monoclinic to cubic for the Mg₂NiH₄ phase of the composite as well as the formation of MgNi₂.

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Yu, Hao. « Matériaux hydrures pour le stockage irréversible ou réversible de l’hydrogène ». Thesis, Lyon 1, 2012. http://www.theses.fr/2012LYO10247.

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L’utilisation des combustibles fossiles (énergies non renouvelables) est responsable de l’augmentation de la concentration en gaz à effet de serre dans l’atmosphère. Lors de l'examen des solutions de rechange, l’hydrogène comme vecteur énergétique est le plus séduisant. Le stockage de l’hydrogène en phase solide sous forme d’hydrures, est l’une des solutions non polluantes futures pour le stockage et le transport de l’énergie. Parmi les matériaux candidats, le borohydrure de sodium (NaBH4) et l’hydrure de magnésium (MgH2) ont été sélectionnés au vu de leur capacité gravimétrique élevée en hydrogène. La réaction d'hydrolyse de NaBH4 a été étudiée dans un calorimètre en phase liquide couplée à un compteur à gaz, afin de suivre en même temps, la cinétique de production d’hydrogène et l’évolution de la chaleur de réaction. Nous avons préparé des catalyseurs à base de cobalt supporté sur différents supports (hydrotalcites, KF/Al2O3, hétéropolyanions) ayant des propriétés acido-basiques différentes. Les supports et les catalyseurs à base de cobalt ont été caractérisés par DRX, MEB+EDX, ICP et BET. Co/hétéropolyanions a montré une cinétique très élevée pour la production d'hydrogène accompagnée d'une conversion totale dans la réaction d'hydrolyse. L’absorption et la désorption de l’hydrogène ont été étudiées sur l’hydrure de magnésium. Afin d’améliorer la cinétique de sorption de MgH2, nous avons préparé des mélanges MgH2-MT (MT = métal de transition Co, Ni, Fe, Cr, Mn), MgH2-MTmélangé (MT = métal de transition Co, Ni, Fe,), MgH2-MTnano (MT = métal de transition Conano, Ninano, Fenano, Cunano, Znnano) et MgH2-nLiBH4-MTnano (MT = métal de transition Conano, Ninano, Fenano) par broyage à billes de haute énergie. Leurs propriétés physico-chimiques ont été étudiées par DRX et MEB+EDX. La température de désorption de l’hydrogène et la quantité d’hydrogène dégagée ont été étudiées par TPD. La cinétique d’absorption de l’hydrogène et la réversibilité du stockage de l’hydrogène ont été étudiées par isotherme PCT pour le système MgH2-MTnano. MgH2-10-Ninano présente la meilleure propriété de stockage réversible de l’hydrogène, MgH2-10-Conano et MgH2- 10-Fenano sont aussi de bons candidats potentiels
The use of fossil fuels (non-renewable) is the main raison of increasing the green house in the atmosphere. Among the considered alternatives, hydrogen is seen as the most attractive energy carrier. The storage of the hydrogen in the solid phase in the form of hydrides is one of the clean future solutions for storage and transport of energy. Among potential materials, sodium borohydride (NaBH4) and magnesium hydride (MgH2) were selected regarding their high hydrogen gravimetric capacity. The hydrolysis reaction of NaBH4 was studied in a liquid phase calorimetry coupled to a gas-meter, in order to monitor simultaneously the kinetics of the hydrogen production and the evolution of the reaction heat. We prepared cobalt supported catalysts using various supports (hydrotalcites, KF/Al2O3, heteropolyanions) with different acid-base properties. The supports and the catalysts were characterized by XRD, SEM+EDX, ICP and BET. Co/heteropolyanions showed a very high kinetics for the production of hydrogen accompanied by a total conversion in the hydrolysis reaction. The absorption and desorption of hydrogen were studied using magnesium hydride. In order to improve the sorption kinetics of MgH2, we have prepared the MgH2-MT (MT= transition metal Co, Ni, Fe, Cr, Mn), MgH2-MTmixture (MT= transition metal Co, Ni, Fe), MgH2-MTnano (MT = transition metal Conano, Ninano, Fenano, Cunano, Znnano) and MgH2-nLiBH4-MTnano (MT = transition metal Conano, Ninano, Fenano) mixtures by high energy ball milling. Their physicochemical properties were studied by XRD and SEM+EDX. The temperature of hydrogen desorption and the amount of hydrogen generated were investigated by TPD. The kinetics of hydrogen absorption and the reversibility of hydrogen storage were investigated with PCT isotherm for the system of MgH2-MTnano. The sample MgH2-10-Ninano presents the best property for reversible hydrogen storage; MgH2- 10-Conano and MgH2-10-Fenano are also good potential candidates

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Rivera, Luis A. « Destabilization and characterization of LiBH4/MgH2 complex hydride for hydrogen storage ». [Tampa, Fla.] : University of South Florida, 2007. http://purl.fcla.edu/usf/dc/et/SFE0001984.

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Wegner, Wojciech. « Nowe wielofunkcyjne materiały oparte na związkach boru i magnezu, lantanowców lub wybranych metali przejściowych : synteza i charakterystyka fizykochemiczna ». Doctoral thesis, 2021. https://depotuw.ceon.pl/handle/item/3867.

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Chapitres de livres sur le sujet "Magnesium borohydride"

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DU, Fang, Yanwei Wang, Huisi Wang, Danchun Huang, Yanqing Ding, Hong Chen, Lei Li, Bowen Tao et Jian Gu. « Study on the Construction and Basic Application of Fluorinated Graphene Modified Magnesium Borohydride ». Dans Springer Proceedings in Physics, 545–56. Singapore : Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1774-5_41.

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Shimizu, M. « Variation 2 : Magnesium Chloride/Potassium Borohydride Promoted Reductions ». Dans Science of Synthesis Knowledge Updates KU 2010/4, 1. Georg Thieme Verlag KG, 2010. http://dx.doi.org/10.1055/sos-sd-107-00014.

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Actes de conférences sur le sujet "Magnesium borohydride"

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Amama, Placidus B., Jonathan E. Spowart, Andrey A. Voevodin et Timothy S. Fisher. « Modified Magnesium Hydride and Calcium Borohydride for High-Capacity Thermal Energy Storage ». Dans ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44133.

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MgH2 and Ca(BH4)2 are potential thermal energy storage (TES) materials that possess extraordinarily high inherent thermal energy densities of up to 2 MJ/kg. However, the high desorption temperatures at atmospheric pressure [>300°C for Ca(BH4)2, >400°C for MgH2] coupled with slow kinetics represent significant challenges for their use in TES. In order to address these challenges, the present work focuses on the development of new modification approaches based on nanostructuring via high-energy vibratory ball milling and catalytic enhancement using pure Ni and Ni alloys. Our work reveals that high-energy vibrating-mill technique with ball-to-powder weight ratio as low as 13:1can produce MgH2 powders with nanocrystallites after 2h of milling. MgH2 milled with Ni (5 wt%) and Ni5Zr2 (5 wt%) catalysts for 2 h showed apparent activation energies, EA of 81 and 79 kJ/mol, respectively, corresponding to ∼50% decrease in EA and ∼100°C decrease in the decomposition temperature (Tdec). On the other hand, the decomposition reaction of Ca(BH4)2 does not seem to be catalyzed by the Ni-based catalysts tested.

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Ved, Ankeeth Suresh, G. H. Miley et T. S. Seetaraman. « Recycling Sodium Metaborate to Sodium Borohydride Using Wind-Solar Energy System for Direct Borohydride Fuel Cell ». Dans ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2010. http://dx.doi.org/10.1115/fuelcell2010-33303.

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One of the major issues with DBFC is availability of Sodium borohydride and economics of converting sodium metaborate, product of reactions in DBFC, to sodium borohydide. Work has been done by L Kong et all [1] to convert Sodium metaborate to sodium borohydride using magnesium hydride. The work presented here discusses various other possibilities to recycle NaBO2 and how it could be coupled with existing wind and solar energy systems to make it economically viable. A little variation form Brown Schlesinger process [2], commonly used to produce sodium borohydide is proposed and with discussion on possible renewable energy system are presented below. a] Steam reforming of methane : Solar energy can be utilized to convert water into steam. Also possibilities of using geothermal energy where available cannot be ruled out. b] Using sea water to get sodium metal: Electrolysis of seawater enables us to have this process on board on offshore wind mills. Also presence of other salts in sea like calcium chloride favor electrolysis. c] Hydrolysis of NaBO2 to make boric acid: This is the deviation from the exiting Brown Schlesinger and thermoeconomics is under investigation. d] Boric acid reacts with methanol to give trimethylborate. e] Sodium metal in presence of hydrogen from steam reforming react to give sodium hydride. f] Sodium hydride and trimethylboate react to give sodium borohydide and sodium methoxide which decomposes into methanol and NaOH. Another method that would be included in this study is using NaBO2 to produce borohallide (BX3) which in presence of LiAlH4 would give B2H6 which with sodium carbonate (from sodium metaborate and methane or carbon dioxide) would give sodium hydroxide. This is under study and hence not much data is available right now. From the cost study it is seen that for the first mentioned process the initial cost associated is high and exact amount is still under debate. Advantage of utilizing renewable source is that the renewable energy can be converted into efficient source of energy for mobile applications.

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Rapports d'organisations sur le sujet "Magnesium borohydride"

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Amama, Placidus B., Jonathan E. Spowart, Andrey A. Voevodin et Timothy S. Fisher. Agile Thermal Management STT-RX, Modified Magnesium Hydride and Calcium Borohydride for High-Capacity Thermal Energy Storage (PREPRINT). Fort Belvoir, VA : Defense Technical Information Center, décembre 2011. http://dx.doi.org/10.21236/ada554163.

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