Hydrogen sorption properties of M0.2Ca0.8MgH4 (M = Li, Na)

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  • Technical University of Ambato


The synthesis, thermodynamic destabilisation and hydrogen sorption properties of the M0.2Ca0.8MgH4 hydride system, where (M = Na or Li) have been investigated. Samples were mechanically milled under argon for 5, 10 and 15 h; then characterised by X-ray diffraction (in/ex-situ), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA) coupled with a mass spectrometer (MS). On Li and Na substitution into Ca–Mg–H ternary hydride, diffraction peaks shifted to higher angles. 2 and 3 endothermic reactions were observed for the Li0.2Ca0.8MgH4 and Na0.2Ca0.8MgH4. The maximum amount of hydrogen release was achieved for the 5 h milled Na0.2Ca0.8MgH4 hydride from 298 °C to 386 °C accounting for 3.5 wt % of H2.

Bibliographic note

Funding Information: The authors gratefully acknowledge financial support from the: Ecuadorian Government for funding under the National Secretariat of Higher Education, Science, Technology and Innovation (SENESCYT) programme 2012. Publisher Copyright: © 2021 Hydrogen Energy Publications LLC


Original languageEnglish
Pages (from-to)9151-9162
Number of pages12
JournalInternational Journal of Hydrogen Energy
Issue number13
Early online date26 Jan 2021
Publication statusPublished - 19 Feb 2021


  • Desorption, Hydrogen storage, Mechanical milling, Substitution