Increasing Hydrogen Density with the Cation-Anion Pair BH 4 ? -NH 4 + in Perovskite-Type NH 4 Ca(BH 4 ) 3

Pascal Schouwink, Fabrice Morelle, Yolanda Sadikin, Yaroslav Filinchuk and Radovan Černý
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Pascal Schouwink: Department of Quantum Matter Physics, Laboratory of Crystallography, University of Geneva, Quai Ernest-Ansermet 24, CH-1211 Geneva, Switzerland
Fabrice Morelle: Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, Place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium
Yolanda Sadikin: Department of Quantum Matter Physics, Laboratory of Crystallography, University of Geneva, Quai Ernest-Ansermet 24, CH-1211 Geneva, Switzerland
Yaroslav Filinchuk: Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, Place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium
Radovan Černý: Department of Quantum Matter Physics, Laboratory of Crystallography, University of Geneva, Quai Ernest-Ansermet 24, CH-1211 Geneva, Switzerland

Energies, 2015, vol. 8, issue 8, 1-14

Abstract: A novel metal borohydride ammonia-borane complex Ca(BH 4 ) 2 ·NH 3 BH 3 is characterized as the decomposition product of the recently reported perovskite-type metal borohydride NH 4 Ca(BH 4 ) 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. NH 4 Ca(BH 4 ) 3 is prepared mechanochemically from Ca(BH 4 ) 2 and NH 4 Cl as well as NH 4 BH 4 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 NH 4 Ca(BH 4 ) 3 pure H 2 is released, prior to the decomposition of the complex to its constituents. As opposed to a previously reported adduct between Ca(BH 4 ) 2 and NH 3 BH 3 , the present complex is described as NH 3 BH 3 -stuffed ?-Ca(BH 4 ) 2 .

Keywords: metal borohydride; perovskite; ammonium; ammonia-borane; protic-hydridic; hydrogen storage (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2015
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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