Hydrogen storage behavior of Mg@Mg2Si and Mg@Mg17Al12 alloys with additions of carbon allotropes and talc

0487180 - ÚFM 2019 RIV CH eng J - Journal Article
Čermák, Jiří - Král, Lubomír
Hydrogen storage behavior of Mg@Mg2Si and Mg@Mg17Al12 alloys with additions of carbon allotropes and talc.
Journal of Alloys and Compounds. Roč. 744, MAY (2018), s. 252-259. ISSN 0925-8388. E-ISSN 1873-4669
R&D Projects: GA ČR(CZ) GA17-21683S
Institutional support: RVO:68081723
Keywords : Hydrogen storage * Magnesium alloys * Ball milling * Carbon
OECD category: Thermodynamics
Impact factor: 4.175, year: 2018

Mg based hydrogen storage alloys containing catalyzing particles are frequently studied because the
catalysis is one of possible ways how to speed-up effectively the hydrogen sorption kinetics. Ball milled
alloys Mg@Mg 2 Si and Mg@Mg 17 Al 12 are studied in the present paper. They consist of Mg grains, which
hydrogen storage performance is catalyzed by the Mg 2 Si and Mg 17 Al 12 particles. Graphite, amorphous
carbon (carbon black) and magnesium silicate monohydrate (talc) were added to facilitate the fine ball
milling. It was found that addition 0.14 wt% of amorphous carbon to Mg@Mg 2 Si shows the best hydrogen
sorption kinetics and the highest sorption capacity of about 6 wt% H 2 . A weak destabilization of MgH 2
hydride by Mg 2 Si and Mg 17 Al 12 was observed. New technique of equilibrium hydrogen pressure esti-
mation was proposed.
Permanent Link: http://hdl.handle.net/11104/0286659