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

Heere, Michael
GharibDoust, Seyed
Frommen, Christoph
Sørby, Magnus
Jensen, Torben
Hauback, Bjørn
Published in Inorganics. 2017, vol. 5, no. 2, p. 31
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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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. https://archive-ouverte.unige.ch/unige:96037

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Deposited on : 2017-08-07

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