Hydrogen desorption from ball milled MgH2 catalyzed with Fe

Bassetti, A.; Bonetti, E.; Pasquini, Luca; Montone, A.; Grbović, J.; Antisari, M. Vittori

doi:10.1140/epjb/e2005-00023-9

Cited by 104 publications

(52 citation statements)

References 21 publications

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“…The added weight of the Ni in the alloy decreases the overall theoretical hydrogen storage weight capacity from 7.6 to 3.6%. The use of Pd as a catalyst has also been studied in some detail [11][12][13][14]. A reduction in hydrogenation temperature, which is desirable for practical hydrogen storage applications, has been observed for the MgH 2 system in the presence of Pd.…”

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confidence: 99%

Hydrogen storage characteristics of nanograined free-standing magnesium–nickel films

et al. 2009

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Free-standing magnesium-nickel (Mg-Ni) films with extensive nanoscale grain structures were fabricated using a combination of pulsed laser deposition and film delaminating processes. Hydrogen sorption and desorption properties of the films, free from the influence of substrates, were investigated. Oxidation of the material was reduced through the use of a sandwiched free-standing film structure in which the top and bottom layers consist of nanometerthick Pd layers, which also acted as a catalyst to promote hydrogen uptake and release. Hydrogen storage characteristics were studied at three temperatures, 296, 232, and 180°C, where multiple sorption/desorption cycles were measured gravimetrically. An improvement in hydrogen storage capacity over the bulk Mg-Ni target material was found for the free-standing films. As shown from a Van't Hoff plot, the thermodynamic stability of the nanograined films is similar to that of Mg 2 Ni. These results suggest that free-standing films, of which better control of material compositions and microstructures can be realized than is possible for conven- The need for a safe, reliable, and efficient method of hydrogen storage for transportation applications is stronger now than ever before. This need has led to a continuous increase in both the breadth and depth of research in the field of hydrogen storage. Compressed gas, liquid hydrogen, and various chemical and metal hydride approaches have been proposed and studied over the past 20 years [1]. Despite extensive research effort, no definitive best method or best material has been identified. Weaknesses and difficulties for every method and material exist. Examples are the poor volumetric storage of hydrogen as a compressed gas, the boil off of liquid hydrogen, the poor irreversibility of chemical and metal hydrides [2].Metal hydrides consisting of a high fraction of lightweight elements have attracted much attention. The basic storage mechanisms of hydrogen by physisorption and chemisorption as well as the importance of catalysts have been elucidated [3][4][5]. More recently, the benefits of using nanometer-sized materials have also been explored [6][7][8]. Through nanostructuring, improvements in hydrogen uptake and release kinetics at little cost to hydrogen sorption capacities are possible. There are, however, very few material synthesis approaches that can generate a sufficient quantity of nanostructured light-weight metals (which are generally reactive upon exposure toward air and water) for reliable testing of their hydrogen storage properties. The majority of existing studies of metal hydrides are based on the characterization of ball-milled powders. For many materials of

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confidence: 99%

Hydrogen storage characteristics of nanograined free-standing magnesium–nickel films

et al. 2009

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“…The most improvements have come from the catalytic approaches, in which the size of the MgH 2 particles have been reduced down to the nanometer dimensions (increasing the surface/volume ratio), their surface made more active and (or) the bulk less ordered by introduction of defects of various kinds, and by adding various elements to the system, molecules and compounds [3,4,[6][7][8]41,44,[53][54][55][56][57][58][59][60][61][62][63][64]93,94]. All above mentioned approaches could be understood and its particular relation to H-behavior resolved and established from the electronic structure point of view.…”

Section: Possibilities For Improvement Of the Mg/mgh 2 Hydrogenation/mentioning

confidence: 99%

“…Metal hydrides represent promising technology for cleaner, cheaper and more efficient energy production [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. They are also systems of considerable theoretical interest [15][16][17][18][19][20][21][22][23][24][25] convenient for investigation of fundamental interactions that are expected to be important in new complex materials [26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

“…Even though detailed experimental and theoretical [3][4][5][6][7][8]34,[40][41][42][43][44][45][46][47][48][49][50][51][52] studies have been performed on these tasks, sorption kinetics has not yet been understood, since the Mg-H interaction is strongly influenced by the synthesis method and the presence of additives. For instance, ball milling [3][4][5][6][7][8]42,43] causes mechanical deformation, surface modification, and metastable phase formation, and generally promotes the solidgas reaction: defect zones may accelerate the diffusion of hydrogen, and defect clusters may lower the barrier for nucleation of MgH 2 . Addition of metals [53,54], transition metals [3,4,[6][7][8]41,44,[55][56][57][58][59][60][61][62], metal oxides …”

Section: Introductionmentioning

confidence: 99%

“…For instance, ball milling [3][4][5][6][7][8]42,43] causes mechanical deformation, surface modification, and metastable phase formation, and generally promotes the solidgas reaction: defect zones may accelerate the diffusion of hydrogen, and defect clusters may lower the barrier for nucleation of MgH 2 . Addition of metals [53,54], transition metals [3,4,[6][7][8]41,44,[55][56][57][58][59][60][61][62], metal oxides [61][62][63], or intermetallic compounds [62,64] as catalysts to mechanically milled MgH 2 , usually decreases its thermal stability and decomposition temperature and enhances sorption kinetics. Since nanosized powders are specific systems with properties controlled by their dimensions, they have been recognized as a possible solution for the problem of hydrogen sorption kinetics [7,10].…”

Section: Introductionmentioning

confidence: 99%

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Electronic Principles of Hydrogen Incorporation and Dynamics in Metal Hydrides

et al. 2012

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An approach to various metal hydrides based on electronic principles is presented. The effective medium theory (EMT) is used to illustrate fundamental aspects of metal-hydrogen interaction and clarify the most important processes taking place during the interaction. The elaboration is extended using the numerous existing results of experiment and calculations, as well as using some new material. In particular, the absorption/desorption of H in the Mg/MgH 2 system is analyzed in detail, and all relevant initial structures and processes explained. Reasons for the high stability and slow sorption in this system are noted, and possible solutions proposed. The role of the transition-metal impurities in MgH 2 is briefly discussed, and some interesting phenomena, observed in complex intermetallic compounds, are mentioned. The principle mechanism governing the Li-amide/imide transformation is also discussed. Latterly, some perspectives for the metal-hydrides investigation from the electronic point of view are elucidated.

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Synthesis of Mg₂FeH₆ by High‐Temperature High‐Pressure Reactive Planetary Ball Milling

Baran,

Jensen,

Polański

2024

Adv Eng Mater

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Herein, a new approach for the synthesis of metal hydrides using simultaneous high‐temperature and high‐pressure reactive ball milling (HTHPRBM) is demonstrated by preparing ternary magnesium iron hydride. The novelty and uniqueness of this technique are based on its integration of a specially designed and manufactured milling vial, allowing synthesis at controlled elevated temperatures (RT‐400°C) and pressures up to 100 bar. A Mg and Fe (2:1) mixture was used as a substrate for Mg2FeH6 synthesis. The effects of temperature on the synthesis kinetics and their outcomes were examined. An increase in the temperature accelerated the kinetics of hydrogen absorption for MgH2, while Mg2FeH6 formation was observed only above 250°C. Increasing the reaction temperature caused magnesium particle refinement due to the hydrogenation and formation of magnesium hydrides but also led to the agglomeration of iron caused by plastification due to a lack of strain hardening. The maximum conversion to Mg2FeH6 was observed for the sample premilled at room temperature. This work revealed that additional physical variables, e.g., pressure, temperature, time, and milling speed, during mechanochemical synthesis and material properties need to be evaluated and considered to improve the reaction kinetics and yield of the synthesis.This article is protected by copyright. All rights reserved.

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Hydrogen desorption from ball milled MgH2 catalyzed with Fe

Cited by 104 publications

References 21 publications

Hydrogen storage characteristics of nanograined free-standing magnesium–nickel films

Hydrogen storage characteristics of nanograined free-standing magnesium–nickel films

Electronic Principles of Hydrogen Incorporation and Dynamics in Metal Hydrides

Synthesis of Mg₂FeH₆ by High‐Temperature High‐Pressure Reactive Planetary Ball Milling

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Hydrogen desorption from ball milled MgH2 catalyzed with Fe

Cited by 104 publications

References 21 publications

Hydrogen storage characteristics of nanograined free-standing magnesium–nickel films

Hydrogen storage characteristics of nanograined free-standing magnesium–nickel films

Electronic Principles of Hydrogen Incorporation and Dynamics in Metal Hydrides

Synthesis of Mg2FeH6 by High‐Temperature High‐Pressure Reactive Planetary Ball Milling

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Synthesis of Mg₂FeH₆ by High‐Temperature High‐Pressure Reactive Planetary Ball Milling