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

Schouwink, Pascal; Morelle, Fabrice; Sadikin, Yolanda; Filinchuk, Yaroslav; Cerny, Radovan

doi:10.3390/en8088286

Scientific article

English

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

Contributors

Schouwink, Pascal; Morelle, Fabrice; Sadikin, Yolanda; Filinchuk, Yaroslav; Cerny, Radovan

Published in

Energies, vol. 8, no. 8, p. 8286-8299

Publication date

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.

UNIGE affiliation entities

Faculté des sciences / Section de physique / Département de physique de la matière quantique

UNIGE research groups

Groupe Cerny

Citation (ISO format)

SCHOUWINK, Pascal et al. Increasing Hydrogen Density with the Cation-Anion Pair BH₄⁻-NH₄⁺ in Perovskite-Type NH₄Ca(BH₄)₃. In: Energies, 2015, vol. 8, n° 8, p. 8286–8299. doi: 10.3390/en8088286

Article (Published version)

Identifiers

PID : unige:75458
DOI : 10.3390/en8088286

Additional URL for this publication

http://www.mdpi.com/1996-1073/8/8/8286/

Journal ISSN

1996-1073

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Creation

24/09/2015 11:18:00

First validation