Abstract
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.
Original language | English |
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Pages (from-to) | 9151-9162 |
Number of pages | 12 |
Journal | International Journal of Hydrogen Energy |
Volume | 46 |
Issue number | 13 |
Early online date | 26 Jan 2021 |
DOIs | |
Publication status | Published - 19 Feb 2021 |
Bibliographical 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
Keywords
- Desorption
- Hydrogen storage
- Mechanical milling
- Substitution
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Condensed Matter Physics
- Energy Engineering and Power Technology