Exploring Ternary and Quaternary Mixtures in the LiBH4‐NaBH4‐KBH4‐Mg(BH4)2‐Ca(BH4)2 System. Issue 10 (22nd February 2019)

• Record Type: Journal Article
• Authors: Dematteis, Erika M.; Pistidda, Claudio; Dornheim, Martin; Baricco, Marcello
• Is Part Of: Chemphyschem. Volume 20:Issue 10(2019)
• Page Start: 1348
• Page End: 1359
• Publication Date: 2019-02-22
• Subjects: borohydrides -- complex hydrides -- hydrogen storage -- quaternary mixtures -- ternary mixtures; Chemistry, Physical and theoretical -- Periodicals; 541.05
• DOI: 10.1002/cphc.201801130
• Languages: English
• ISSNs: 1439-4235

Abstract

Abstract: Binary combinations of borohydrides have been extensivly investigated evidencing the formation of eutectics, bimetallic compounds or solid solutions. In this paper, the investigation has been extended to ternary and quaternary systems in the LiBH4 ‐NaBH4 ‐KBH4 ‐Mg(BH4 )2 ‐Ca(BH4 )2 system. Possible interactions among borohydrides in equimolar composition has been explored by mechanochemical treatment. The obtained phases were analysed by X‐ray diffraction and the thermal behaviour of the mixtures were analysed by HP‐DSC and DTA, defining temperature of transitions and decomposition reactions. The release of hydrogen was detected by MS, showing the role of the presence of solid solutions and multi‐cation compounds on the hydrogen desorption reactions. The presence of LiBH4 generally promotes the release of H2 at about 200 °C, while KCa(BH4 )3 promotes the release in a single‐step reaction at higher temperatures. Abstract : Ternary and quaternary equimolar mixtures in the LiBH4 ‐NaBH4 ‐KBH4 ‐Mg(BH4 )2 ‐Ca(BH4 )2 system are investigated, showing the formation of bi/tri‐metallic compounds, such as KCa(BH4 )3, LiKMg(BH4 )4, and LiK(BH4 )2, as well as many new eutectics. Hydrogen desorption occurs from the liquid phase via complex, multi‐step reactions.