HYDROGEN ABSORPTION IN A-CO30FE55B15

1,2 ČERMÁK Jiří
Co-authors:
1 KRÁL Lubomír 1,3 ROUPCOVÁ Pavla
Institutions:
1 Institute of Physics of Materials AS CR, v.v.i., Brno, Czech Republic, EU
2 CEITEC IPM, Institute of Physics of Materials, AS CR, Brno, Czech Republic, EU
3 BUT, FME, IMSE, Brno, Czech Republic, EU
Conference:
25th Anniversary International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 25th - 27th 2016
Proceedings:
Proceedings 25th Anniversary International Conference on Metallurgy and Materials
Pages:
1368-1373
ISBN:
978-80-87294-67-3
ISSN:
2694-9296
Published:
14th December 2016
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
83 views / 23 downloads
Abstract

Hydrogen solved in amorphous alloys (AAs) influences their magnetic characteristics. AAs are also perspective as additives that can improve hydrogen storage kinetic in certain types of ball-milled hydrogen storage materials (HSMs). Therefore, knowledge of hydrogen solubility and hydrogen sorption kinetics in AAs are of a great importance for aimed design both AAs with optimal magnetic parameters and HSMs with desired sorption characteristics. In the present paper, amorphous alloy Co30Fe55B15 (an example of the type a-TM1xTM2yBz; TM – transition metal) was investigated. Hydrogen concentration cH was measured by Sieverts method in temperature interval from T = 150 °C to T = 350 °C under hydrogen pressure p up to 6 MPa. It was found that cH was an increasing function of p and its maximum value was typically 0.5 wt.% H2 at 350 °C and 6 MPa. However, when the alloy was preliminary hydrogen charged (PHC), the pressure dependence of total cHtot in the first absorption cycle(s) is non-monotonous in dependence on PHC conditions. For the sake of comparison, the same absorption characteristics were measured also in Mg2Ni intermetallic that is a common constituent in Mg-based HSMs. Comparing Co30Fe55B15 and Mg2Ni, it was concluded that Co30Fe55B15 shows lower hydrogen solubility, but much better absorption kinetics.

Keywords: Hydrogen, absorption, Co30Fe55B15

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