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Increasing hydrogen density with the cation-anion pair BH4--NH4+ in perovskite-type NH4Ca(BH4)3

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Schouwink, P. [University of Geneva (Switzerland)] Morelle, Fabrice [UCL] Sadikin, Y. [University of Geneva (Switzerland)] Filinchuk, Yaroslav [UCL] Cerny, R. [University of Geneva (Switzerland)]

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.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès libre
Publication date 2015
Language Anglais
Journal information "Energies - Open Access Energy Research, Engineering and Policy Journal" - Vol. 8, no.8, p. 8286-8299 (2015)
Peer reviewed yes
Publisher MDPI AG
issn 1996-1073
Publication status Publié
Affiliation UCL - SST/IMCN/MOST - Molecules, Solids and Reactivity
Keywords metal borohydride ; perovskite ; ammonium ; ammonia-borane ; protic-hydridic ; hydrogen storage
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Bibliographic reference Schouwink, P. ; Morelle, Fabrice ; Sadikin, Y. ; Filinchuk, Yaroslav ; Cerny, R.. Increasing hydrogen density with the cation-anion pair BH4--NH4+ in perovskite-type NH4Ca(BH4)3. In: Energies - Open Access Energy Research, Engineering and Policy Journal, Vol. 8, no.8, p. 8286-8299 (2015)
Permanent URL http://hdl.handle.net/2078.1/171501