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Energies 2015, 8(8), 8286-8299; doi:10.3390/en8088286

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
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)
View Full-Text   |   Download PDF [1119 KB, uploaded 19 August 2015]   |  

Abstract

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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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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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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