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Hydrogen Sorption in Erbium Borohydride Composite Mixtures with LiBH4 and/or LiH

Contributors

Heere, Michael; GharibDoust, Seyed; Brighi, Matteo; Frommen, Christoph; Sørby, Magnus; Cerny, Radovan; Jensen, Torben; Hauback, Bjørn

Published in

Inorganics, vol. 5, no. 2, 31

Publication date

2017

Abstract

Rare earth (RE) metal borohydrides have recently been receiving attention as possible hydrogen storage materials and solid-state Li-ion conductors. In this paper, the decomposition and reabsorption of Er(BH4)3 in composite mixtures with LiBH4 and/or LiH were investigated. The composite of 3LiBH4 + Er(BH4)3 + 3LiH has a theoretical hydrogen storage capacity of 9 wt %, nevertheless, only 6 wt % hydrogen are accessible due to the formation of thermally stable LiH. Hydrogen sorption measurements in a Sieverts-type apparatus revealed that during three desorption-absorption cycles of 3LiBH4 + Er(BH4)3 + 3LiH, the composite desorbed 4.2, 3.7 and 3.5 wt % H for the first, second and third cycle, respectively, and thus showed good rehydrogenation behavior. In situ synchrotron radiation powder X-ray diffraction (SR-PXD) after ball milling of Er(BH4)3 + 6LiH resulted in the formation of LiBH4, revealing that metathesis reactions occurred during milling in these systems. Impedance spectroscopy of absorbed Er(BH4)3 + 6LiH showed an exceptional high hysteresis of 40–60 K for the transition between the high and low temperature phases of LiBH4, indicating that the high temperature phase of LiBH4 is stabilized in the composite.

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UNIGE research groups

Citation (ISO format)

HEERE, Michael et al. Hydrogen Sorption in Erbium Borohydride Composite Mixtures with LiBH4 and/or LiH. In: Inorganics, 2017, vol. 5, n° 2, p. 31. doi: 10.3390/inorganics5020031

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Article (Published version)

Identifiers

Additional URL for this publication

http://www.mdpi.com/2304-6740/5/2/31

Journal ISSN

2304-6740
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Technical informations

Creation

07/08/2017 11:05:00

First validation

07/08/2017 11:05:00

Update

15/03/2023 01:54:52

Status update

15/03/2023 01:54:51

Last indexation

31/10/2024 07:31:23
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