Simultaneous desorption behavior of M borohydrides and Mg2FeH6 reactive hydride composites (M = Mg, then Li, Na, K, Ca)

Anna Lisa Chaudhary, Guanqiao Li, Motoaki Matsuo, Shin Ichi Orimo, Stefano Deledda, Magnus H. Sørby, Bjørn C. Hauback, Claudio Pistidda, Thomas Klassen, Martin Dornheim

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Abstract

Combinations of complex metal borohydrides ball milled with the transition metal complex hydride, Mg2FeH6, are analysed and compared. Initially, the Reactive Hydride Composite (RHC) of Mg2+ cation mixtures of Mg2FeH6 and γ-Mg(BH4)2 is combined in a range of molar ratios and heated to a maximum of 450 °C. For the molar ratio of 6 Mg2FeH6 + Mg(BH4)2, simultaneous desorption of the two hydrides occurred, which resulted in a single event of hydrogen release. This single step desorption occurred at temperatures between those of Mg2FeH6 and γ-Mg(BH4)2. Keeping this anionic ratio constant, the desorption behavior of four other borohydrides, Li-, Na-, K-, and Ca-borohydrides was studied by using materials ball milled with Mg2FeH6 applying the same milling parameters. The mixtures containing Mg-, Li-, and Ca-borohydrides also released hydrogen in a single event. The Mass Spectrometry (MS) results show a double step reaction within a narrow temperature range for both the Na- and K-borohydride mixtures. This phenomenon, observed for the RHC systems at the same anionic ratio with all five light metal borohydride mixtures, can be described as simultaneous hydrogen desorption within a narrow temperature range centered around 300 °C.

Original languageEnglish
Article number073905
JournalApplied Physics Letters
Volume107
Issue number7
DOIs
Publication statusPublished - 2015 Aug 17

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Chaudhary, A. L., Li, G., Matsuo, M., Orimo, S. I., Deledda, S., Sørby, M. H., Hauback, B. C., Pistidda, C., Klassen, T., & Dornheim, M. (2015). Simultaneous desorption behavior of M borohydrides and Mg2FeH6 reactive hydride composites (M = Mg, then Li, Na, K, Ca). Applied Physics Letters, 107(7), [073905]. https://doi.org/10.1063/1.4929340