Hydrogen storage of Mg-Zn mixed metal borohydrides

G. N. Kalantzopoulos, J. G. Vitillo, E. Albanese, E. Pinatel, B. Civalleri, S. Deledda, S. Bordiga, M. Baricco, B. C. Hauback

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

On the basis of DFT results on the ideal amount of Zn required to dissolute into the α-phase of Mg(BH4)2 (space group P6122) and experimental results recently presented in the literature, mixtures of α-Mg(BH4)2 and ZnCl2 have been prepared by ball-milling, reactive milling and cryo-milling in Mg:Zn starting ratios of 1:0.33, 1:0.2 and 1:0.1. Samples have been characterized with different experimental techniques (PXD, TGA, TPD with RGA and desorption kinetics in a Sieverts apparatus). All the as-milled samples exhibited a H2 release beginning approximately at 125 °C, indicating a significant decrease in the decomposition temperature compared to pure Mg(BH4)2. With the exception of the Mg(BH4)2-0.33ZnCl2 sample ball-milled under 1 bar Ar for 3 h that showed a small B2H6 release around 120 °C, all samples are free of B2H6 emissions. Results from desorption kinetics at 195 °C suggest a strong relation between the amount of ZnCl2 in the starting mixture and the weight loss.

Original languageEnglish (US)
Pages (from-to)S702-S705
JournalJournal of Alloys and Compounds
Volume615
Issue numberS1
DOIs
StatePublished - Dec 5 2014

Bibliographical note

Funding Information:
M. Fitchtner from KIT, Germany is kindly acknowledged for providing Mg(BH 4 ) 2 samples. The research leading to these results has received funding from the European Union’s Seventh Framework Programme (FP7/2007-2013) for the Fuel Cells and Hydrogen Joint Technology Initiative under the E.U. project SSH2S (Grant agreement No. 25665 ).

Publisher Copyright:
© 2014 Elsevier B.V. All rights reserved.

Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

Keywords

  • Cryo-milling
  • Hydrogen storage
  • Mixed metal borohydrides

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