Hydrogen storage properties of nanocrystalline MgH2 and MgH2/Sn nanocomposite synthesized by ball milling

Imamura, Hayao; Tanaka, K.; Kitazawa, Ichirou; Sumi, Takeshi; Sakata, Yoshihisa; Nakayama, Noriaki; Ooshima, Shinji

doi:10.1016/j.jallcom.2009.05.072

Cited by 25 publications

(7 citation statements)

References 20 publications

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“…For instance, the mechanically milled Sn/MgH 2 nanocomposite showed substantially lowered desorption temperature [14], and similar effect was found in the Ge/MgH 2 nanocomposite [15]. By investigating the electron structure and charge density of MgH 2 , Chen et al found that Mg-H bond could be weakened by partial substitution of Sn for Mg [16].…”

Section: Introductionmentioning

confidence: 80%

Microstructure and hydrogen storage properties of Mg–Sn nanocomposite by mechanical milling

Zhong

Wang

Ouyang

et al. 2011

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 80%

Microstructure and hydrogen storage properties of Mg–Sn nanocomposite by mechanical milling

Zhong

Wang

Ouyang

et al. 2011

Journal of Alloys and Compounds

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“…It has been suggested that this nucleation step could be gas pressure dependent and therefore could be the rate limiting step for initial hydrogenation [4], however, other studies have shown that diffusion of hydrogen through the MgH 2 phase controls hydrogenation [8,9]. Growth of MgH 2 occurs at the interface between hydrogen gas and magnesium and grows inward from the particle surface [4] and proceeds faster along lattice defects such as dislocations and vacancies [10]. Studies have also shown that this behaviour can change with the addition of a catalyst such as Nb 2 O 5 [11][12][13] where the reaction was shown to be diffusion controlled along the boundary of the magnesium/hydride phases.…”

Section: Introductionmentioning

confidence: 99%

Reaction kinetic behaviour with relation to crystallite/grain size dependency in the Mg–Si–H system

et al. 2015

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a b s t r a c tAn empirical understanding of the relationship between crystallite size and reaction kinetics for the dehydrogenation of MgH 2 in the presence of Si was determined. MgH 2 was combined with Si under different conditions to obtain varying crystallite sizes of both reactants. Thermal analysis and isothermal desorption were undertaken to obtain reaction kinetic information and therefore determine activation energies as well as the rate limiting step for each of the different crystallite sizes. It was found that there is a strong correlation between crystallite size and activation energy for the growth of the Mg 2 Si phase, however, any correlation between the nucleation (of Mg 2 Si) activation energy was less evident. Direct measurements of kinetic behaviour from a manometric Sieverts apparatus showed that initial reaction kinetics were fastest when MgH 2 was mixed with Si nanoparticles, however, this sample was not able to fully desorb. Data from the Sieverts measurements were then used with well-known theoretical models to determine the rate limiting step of the reaction. The three dimensional Carter-Valensi (or contracting volume) diffusion model could be used to describe the rate limiting step for most of the reactions. These results have led to a proposed mechanism for the formation of Mg 2 Si during the decomposition reaction.

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“…As described previously, the first ball-milling of MgH 2 with the organic additive results in the formation of nanocrystalline MgH 2 with small crystallite sizes and high surface areas. 1,13) Probably, this is closely associated with the formation of the nanocomposites (III) and (IV) by the subsequent milling processes with Al (or AlH 3 ); MgH 2 is used more efficiently for the nanocomposite formation when in a state of nanocrystalline.…”

Section: )mentioning

confidence: 99%

Preparation and Properties of Ball-Milled MgH<sub>2</sub>/Al Nanocomposites for Hydrogen Storage

et al. 2014

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For reversible hydrogen storage properties of 17MgH 2 + 12Al § Mg 17 Al 12 + 17H 2 , MgH 2 /Al nanocomposites (I)(IV) synthesized by ball milling of MgH 2 and Al (or AlH 3 ) were studied in connection with milling conditions. The milling processes consisting of two steps were effective to improve the hydrogen storage behavior; MgH 2 was first milled with solutions of triethylaluminium (TEA) in hexane, followed by addition of Al and TEA solutions. The mixtures were further milled to yield the nanocomposite (III). In preparing the nanocomposite (IV), AlH 3 was used instead of Al. For the nanocomposites (III) and (IV), it was proved by XRD, TDS, DSC and PCI that such ball-milling led to high dispersion of nanocrystalline MgH 2 in Al and/or AlH 3 matrix in the resulting nanocomposites. In DSC measured under a 0.1 MPa hydrogen atmosphere, the nanocomposites (III) and (IV) exhibited reversible H 2 absorption and desorption at 493503 and 573593 K, respectively.

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Hydrogen storage properties of nanocrystalline MgH2 and MgH2/Sn nanocomposite synthesized by ball milling

Cited by 25 publications

References 20 publications

Microstructure and hydrogen storage properties of Mg–Sn nanocomposite by mechanical milling

Microstructure and hydrogen storage properties of Mg–Sn nanocomposite by mechanical milling

Reaction kinetic behaviour with relation to crystallite/grain size dependency in the Mg–Si–H system

Preparation and Properties of Ball-Milled MgH<sub>2</sub>/Al Nanocomposites for Hydrogen Storage

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