INFLUENCE OF GRAPHITE UPON THE KINETICS OF HYDROGEN SORPTION IN MG@MG17AL12

1 ČERMÁK Jiří
Co-authors:
1,2 KRÁL Lubomír 1 ROUPCOVÁ Pavla
Institutions:
1 Institute of Physics of Materials AS CR, v.v.i., Zizkova 22, CZ-61662 Brno, Czech Republic, EU
2 CEITEC-Institute of Physics of Materials, AS CR, Zizkova 22, CZ-61662 Brno, Czech Republic, EU
3 Brno University of Technology, FME, IMSE, Technická 2896/2, CZ-616 69 Brno, Czech Republic, EU
Conference:
9th International Conference on Nanomaterials - Research & Application, Hotel Voronez I, Brno, Czech Republic, EU, October 18th - 20th 2017
Proceedings:
Proceedings 9th International Conference on Nanomaterials - Research & Application
Pages:
792-798
ISBN:
978-80-87294-81-9
ISSN:
2694-930X
Published:
8th March 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
12 views / 4 downloads
Abstract

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 cL lying between 14 and 23 wt. % C, carbon increases both the absorption and the desorption rates and hydrogen storage capacity. Above cL, 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.

Keywords: Hydrogen storage, Mg alloys, graphite
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