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

Author

Listed:
  • 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)

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 α-Ca(BH 4 ) 2 .

Suggested Citation

  • Pascal Schouwink & Fabrice Morelle & Yolanda Sadikin & Yaroslav Filinchuk & Radovan Černý, 2015. "Increasing Hydrogen Density with the Cation-Anion Pair BH 4 − -NH 4 + in Perovskite-Type NH 4 Ca(BH 4 ) 3," Energies, MDPI, vol. 8(8), pages 1-14, August.
    • Handle: RePEc:gam:jeners:v:8:y:2015:i:8:p:8286-8299:d:53782
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    References listed on IDEAS

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    1. Pascal Schouwink & Morten B. Ley & Antoine Tissot & Hans Hagemann & Torben R. Jensen & Ľubomír Smrčok & Radovan Černý, 2014. "Structure and properties of complex hydride perovskite materials," Nature Communications, Nature, vol. 5(1), pages 1-10, December.
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    Cited by:

    1. Craig M. Jensen & Etsuo Akiba & Hai-Wen Li, 2016. "Hydrides: Fundamentals and Applications," Energies, MDPI, vol. 9(4), pages 1-2, April.

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