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Open AccessArticle

Increasing Hydrogen Density with the Cation-Anion Pair BH4-NH4+ in Perovskite-Type NH4Ca(BH4)3

1
Department of Quantum Matter Physics, Laboratory of Crystallography, University of Geneva, Quai Ernest-Ansermet 24, CH-1211 Geneva, Switzerland
2
Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, Place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium
*
Author to whom correspondence should be addressed.
Academic Editor: Craig M. Jensen
Energies 2015, 8(8), 8286-8299; https://doi.org/10.3390/en8088286
Received: 3 March 2015 / Revised: 19 June 2015 / Accepted: 22 July 2015 / Published: 6 August 2015
(This article belongs to the Special Issue Hydrides: Fundamentals and Applications)
A novel metal borohydride ammonia-borane complex Ca(BH4)2·NH3BH3 is characterized as the decomposition product of the recently reported perovskite-type metal borohydride NH4Ca(BH4)3, suggesting that ammonium-based metal borohydrides release hydrogen gas via ammonia-borane-complexes. For the first time the concept of proton-hydride interactions to promote hydrogen release is applied to a cation-anion pair in a complex metal hydride. NH4Ca(BH4)3 is prepared mechanochemically from Ca(BH4)2 and NH4Cl as well as NH4BH4 following two different protocols, where the synthesis procedures are modified in the latter to solvent-based ball-milling using diethyl ether to maximize the phase yield in chlorine-free samples. During decomposition of NH4Ca(BH4)3 pure H2 is released, prior to the decomposition of the complex to its constituents. As opposed to a previously reported adduct between Ca(BH4)2 and NH3BH3, the present complex is described as NH3BH3-stuffed α-Ca(BH4)2. View Full-Text
Keywords: metal borohydride; perovskite; ammonium; ammonia-borane; protic-hydridic; hydrogen storage metal borohydride; perovskite; ammonium; ammonia-borane; protic-hydridic; hydrogen storage
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Schouwink, P.; Morelle, F.; Sadikin, Y.; Filinchuk, Y.; Černý, R. Increasing Hydrogen Density with the Cation-Anion Pair BH4-NH4+ in Perovskite-Type NH4Ca(BH4)3. Energies 2015, 8, 8286-8299.

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