High pressure in situ diffraction studies of metal–hydrogen systems

Yartys, V.A.; Denys, R.V.; Webb, C. J.; Mæhlen, Jan Petter; Gray, Evan; Blach, Tomasz; Isnard, O.; Barnsley, Lester C.

doi:10.1016/j.jallcom.2010.12.030

Cited by 16 publications

(6 citation statements)

References 18 publications

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“…The formation of ZrFe1.8Ni0.2H3.5 and ZrFe1.2Ni0.8H3.7 hydrides results in isotropic expansion (24-26.5 %) of the metal la ice without changing the structure type and the hydrogen atoms tend to occupy the tetrahedral sites with the [Zr(Fe, Ni)3] coordination [76]. The substitution of Al for Fe in ZrFe2 alloy contributes to very fast H/D exchange kinetics in the formed hydrides accompanied by a dramatic decrease of the deuterium absorption plateau pressures [77]. When x increases from 0.02 to 0.04 in ZrFe2−xAlx alloys, the absorption plateau pressure at room temperature decreases from 56 MPa to 41 MPa [78].…”

Section: Zrfe2-based Alloysmentioning

confidence: 99%

Unstable Metal Hydrides for Possible on-Board Hydrogen Storage

Cao,

Habermann,

Burkmann

et al. 2024

Preprint

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Hydrogen storage in general is an indispensable prerequisite for the introduction of a hydrogen energy based infrastructure. In this respect, high-pressure metal hydride (MH) tank systems appear to be one of the most promising hydrogen storage techniques for automotive applications using proton exchange membrane (PEM) fuel cells. These systems bear the potential of achieving a beneficial compromise of comparably large volumetric storage density, a wide working temperature range, comparably low liberation of heat, and increased safety. The debatable term unstable metal hydride stands in the literature short for metal hydrides with high dissociation pressure at comparably low temperature. Such compounds may help to improve the merit of high-pressure MH tank systems. Consequently, in the last few years, some materials for possible on-board applications in such tank systems have been developed. This review summarizes the state-of-the-art developments of these metal hydrides, mainly including intermetallic compounds and complex hydrides and gives some guidelines for future developments. Since typical laboratory hydrogen uptake measurements are limited to 200 bar, a possible threshold for defining unstable hydrides could be a value of their equilibrium pressure of peq > 200 bar for T < 100°C. However, these values would mark a technological future target and most current materials, and those reported in this review, do not fulfill these requirements and need to be seen as current stages of development towards the intended target. For each of the aforementioned categories in the review, special care was taken not only to covers the pioneering and classical research, but also to portrait the current status and latest advances. For intermetallic compounds, key aspects focus on the influence of partial substitution on absorption/desorption plateau pressure, hydrogen storage capacity and hysteresis properties. For complex hydrides, the preparation procedures, thermodynamics and theoretical calculation are presented. Besides, challenges, perspectives, and development tendency of this field are also discussed.

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Section: Zrfe2-based Alloysmentioning

confidence: 99%

Unstable Metal Hydrides for Possible on-Board Hydrogen Storage

Cao,

Habermann,

Burkmann

et al. 2024

Preprint

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“…One may see the strong effect on both the plateau pressure and the capacity. Substitution on the rare earth site is also possible and may also control the equilibrium pressure [40]. It is sometimes difficult to rationalize the changes of the capacity due to substitution, which are related to the change of the electronic properties.…”

Section: Thermodynamic Propertiesmentioning

confidence: 99%

LaNi5 related AB5 compounds: Structure, properties and applications

Joubert

Paul‐Boncour

Cuevas

et al. 2021

Journal of Alloys and Compounds

102

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This paper is a comprehensive review of the properties of LaNi 5 derivatives and other AB 5 compounds with CaCu 5 crystal structure (A=Y, lanthanide, Th and B=transition metal, Al, Ge, Si, Sn) and their applications. The crystal structures of the intermetallic compounds are described considering their chemical composition and off-stoichiometry. Same approach is conducted for the metallic hydrides formed by direct reaction of dihydrogen with the intermetallic. The thermodynamic properties of the sorption reaction are presented regarding equilibrium pressure and reversibility. In a second step, outstanding applications are given focusing first on magnetic properties and electrochemical energy storage. Finally, other uses such as gas storage, heat exchange, compression or gas separation and purification are highlighted showing the tremendous possibilities offered by this class of materials.

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“…We do not advocate this approach because a single flaw in the coating makes the underlying material susceptible to hydrogen attack. The authors use a neutron cell that relies on a surrounding annulus of null-matrix TiZr for strength and has a stainless-steel liner for hydrogen resistance [15]. This cell is rated to 1210 bar at 300 C and so greatly expands the range in p,T accessible with stainless steels or Al alloys.…”

Section: Materials For Cell Constructionmentioning

confidence: 99%