Synthesis of amorphous Mg(BH<inf>4</inf>)<inf>2</inf> from MgB<inf>2</inf> and H<inf>2</inf> at room temperature

Claudio Pistidda, Sebastiano Garroni, Francesco Dolci, Elisa Gil Bardají, Ashish Khandelwal, Pau Nolis, Martin Dornheim, Rapee Gosalawit, Torben Jensen, Yngve Cerenius, Santiago Suriñach, Maria Dolors Baró, Wiebke Lohstroh, Maximilian Fichtner

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Resum

Due to its high hydrogen content and its favourable overall thermodynamics magnesium tetrahydroborate has been considered interesting for hydrogen storage applications. In this work we show that unsolvated amorphous magnesium tetrahydroborate can be obtained by reactive ball milling of commercial MgB 2 under 100 bar hydrogen atmosphere. The material was characterized by solid-state NMR which showed the characteristic features of Mg(BH 4)2, together with those of higher borohydride species. High pressure DSC and TPD-MS showed thermal behaviour similar to that of Mg(BH4)2 but with broadened signals. In situ synchrotron X-ray powder diffraction confirmed the amorphous state of the material and showed the typical crystalline decomposition products of Mg(BH4) 2 at elevated temperatures. © 2010 Elsevier B.V. All rights reserved.
Idioma originalEnglish
Pàgines (de-a)212-215
RevistaJournal of Alloys and Compounds
Volum508
DOIs
Estat de la publicacióPublicada - 15 d’oct. 2010

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