HYDROGEN SORPTION IN ORDERED Mg-In ALLOYS

0511641 - ÚFM 2021 RIV CZ eng C - Conference Paper (international conference)
Čermák, Jiří - Král, Lubomír - Roupcová, Pavla
HYDROGEN SORPTION IN ORDERED Mg-In ALLOYS.
Metal 2019 - 28th International Conference on Metallurgy and Materials. Ostrava: TANGER Ltd., Ostrava, 2019, s. 1422-1427. ISBN 978-80-87294-92-5.
[METAL 2019. International conference on metallurgy and materials /28./. Brno (CZ), 22.05.2019-24.05.2019]
R&D Projects: GA MŠMT(CZ) LQ1601; GA ČR(CZ) GA17-21683S
Institutional support: RVO:68081723
Keywords : Hydrogen storage * Mg alloys * hydride stability * ordering
OECD category: Materials engineering

Hydrogen storage (HS) performance of three Mg- x In- y CB alloys (CB - amorphous carbon, x = 55, 64, 73 y =
10 wt%) was studied. Indium concentration covered an area of ordered β 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 ( β ’’ 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% H 2 . 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.
Permanent Link: http://hdl.handle.net/11104/0302518