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Inorganics 2017, 5(2), 31; doi:10.3390/inorganics5020031

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

1
Physics Department, Institute for Energy Technology, NO-2027 Kjeller, Norway
2
Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, University of Århus, Langelandsgade 140, DK-8000 Århus C, Denmark
3
Laboratory of Crystallography, Department of Quantum Matter Physics, University of Geneva, Quai Ernest-Ansermet 24, Ch-1211 Geneva, Switzerland
*
Author to whom correspondence should be addressed.
Academic Editor: Hiroshi Kageyama
Received: 27 March 2017 / Revised: 19 April 2017 / Accepted: 20 April 2017 / Published: 26 April 2017
(This article belongs to the Special Issue Functional Materials Based on Metal Hydrides)
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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. View Full-Text
Keywords: borohydride; rare earth element; hydrogen storage; decomposition; solid state electrolyte borohydride; rare earth element; hydrogen storage; decomposition; solid state electrolyte
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Heere, M.; GharibDoust, S.H.P.; Brighi, M.; Frommen, C.; Sørby, M.H.; Černý, R.; Jensen, T.R.; Hauback, B.C. Hydrogen Sorption in Erbium Borohydride Composite Mixtures with LiBH4 and/or LiH. Inorganics 2017, 5, 31.

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