Significantly decreased stability of MgH2 in the Mg-In-C alloy system: Long-period-stacking-ordering as a new way how to improve performance of hydrogen storage alloys?

Jiri Cermak, Lubomir Kral and Pavla Roupcova

Renewable Energy, 2020, vol. 150, issue C, 204-212

Abstract: Hydrogen storage (HS) performance of Mg-In-CB alloys (CB – amorphous carbon) is studied. Indium concentration covers primary solid solution (Mg), two phase area (Mg) + β1 and also alloys containing ordered β structures. Seven Mg-In-CB alloys are prepared by ball-milling in hydrogen atmosphere. Kinetic curves and PCT isotherms are measured in the temperature interval from 200 °C to 375 °C. Hydrogen sorption experiments are done by the Sieverts method under the hydrogen gas pressure ranging from 0.1 MPa to 2.5 MPa. X-ray diffraction spectroscopy is used for structure investigation. Alloy with β’’ structure shows reversible amorphization during temperature cycling between about 100 °C and 350 °C. It is found that hydrogen sorption capacity varies between about 6 wt % H2 for (Mg) and 0.6 wt % H2 for β’’ structure. Hydride decomposition enthalpy calculated from desorption PCT experiments decreases to 54 ± 3 kJ × (mol H2)−1 and 57 ± 3 kJ × (mol H2)−1 for ordered alloys in the interval from 69 to 71 wt % In, and even down to 51.5 kJ × (mol H2)−1 for amorphous β’’ structure. Activation energy of desorption kinetics is also lowered in the ordered structure.

Keywords: Hydrogen storage; Mg alloys; Hydride stability; Ordering (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0960148119319792
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:150:y:2020:i:c:p:204-212

DOI: 10.1016/j.renene.2019.12.107

Access Statistics for this article

Renewable Energy is currently edited by Soteris A. Kalogirou and Paul Christodoulides

More articles in Renewable Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().