HYDROGEN SORPTION IN ORDERED MG-IN ALLOYS

1,2 CERMAK Jiri
Co-authors:
1 KRAL Lubomir 1,3 ROUPCOVA Pavla
Institutions:
1 Institute of Physics of Materials AS CR, v.v.i., Zizkova 22, CZ-61662 Brno, Czech Republic, EU, cermak@ipm.cz, lkral@ipm.cz, roupcova@ipn.cz
2 CEITEC-Institute of Physics of Materials, AS CR, Zizkova 22, CZ-61662 Brno, Czech Republic, EU
3 CEITEC-Brno University of Technology, Purkynova 123, CZ-612 00 Brno, Czech Republic, EU,
Conference:
28th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 22nd - 24th 2019
Proceedings:
Proceedings 28th International Conference on Metallurgy and Materials
Pages:
1422-1427
ISBN:
978-80-87294-92-5
ISSN:
2694-9296
Published:
4th November 2019
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
34 views / 7 downloads
Abstract

Hydrogen storage (HS) performance of three Mg-xIn-yCB alloys (CB – amorphous carbon, x = 55, 64, 73; y = 10 wt%) was studied. Indium concentration covered an area of ordered structures. Alloys were prepared by ball-milling in hydrogen atmosphere. Kinetic curves and PCT isotherms were measured in the temperature interval from 200 °C to 325 °C. X-ray diffraction spectroscopy (XRD) was used for structure investigation. Alloy with x = 73 wt% In (’’ structure) showed reversible amorphization during temperature cycling between about 100 °C and 350 °C. Hydrogen sorption experiments were done by the Sieverts method under the hydrogen gas pressure ranging from 0.1 MPa to 2.5 MPa. It was found that hydrogen sorption capacity varied between 0.47 and 1.1 wt% H2. Hydride formation enthalpy H calculated from desorption PCT experiments was significantly lower than H, known for pure Mg. This invoked an idea that atomic order of Mg-based HS materials might decrease the high thermodynamic stability of hydride phase.

Keywords: Hydrogen storage, Mg alloys, hydride stability, ordering
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