INFLUENCE OF GRAPHITE UPON THE KINETICS OF HYDROGEN SORPTION IN Mg@Mg17Al12

0506831 - ÚFM 2020 RIV CZ eng C - Conference Paper (international conference)
Čermák, Jiří - Král, Lubomír - Roupcová, Pavla
INFLUENCE OF GRAPHITE UPON THE KINETICS OF HYDROGEN SORPTION IN Mg@Mg17Al12.
9TH INTERNATIONAL CONFERENCE ON NANOMATERIALS - RESEARCH & APPLICATION (NANOCON 2017). Ostrava: TANGER, 2018, s. 792-798. ISBN 978-80-87294-81-9.
[International Conference on Nanomaterials - Research and Application (NANOCON) /9./. Brno (CZ), 18.10.2017-20.10.2017]
R&D Projects: GA ČR(CZ) GA17-21683S
Institutional support: RVO:68081723
Keywords : storage * Hydrogen storage * Mg alloys * graphite
OECD category: Materials engineering

Influence of graphite addition to the ball-milling charge composed of Mg splinters and Mg17Al12 particles upon the hydrogen sorption was investigated at sorption temperature 623 K. Measurements were carried out by Sieverts method. Graphite facilitates the ball-milling: It prevents re-agglomeration of crushed particles into large secondary particles. It also suppresses sticking the milled material to the balls and walls of the milling jar. It was found that an increase of carbon concentration up to a certain limit c(L) lying between 14 and 23 wt. % C, carbon increases both the absorption and the desorption rates and hydrogen storage capacity. Above c(L), carbon causes a considerable decrease in HS capacity, which spoils the application potential of Mg@Mg17Al12/C. Crystallite size of the material under study, obtained by XRD, is in the order of tens of nm.
Permanent Link: http://hdl.handle.net/11104/0300215