Effect of the process parameters on the energy transfer during the synthesis of the 2LiBH₄-MgH₂ reactive hydride composite for hydrogen storage

Jepsen, Julian; Capurso, Giovanni; Puszkiel, Julián A.; Busch, Nina; Werner, Tobias; Milanese, Chiara; Girella, Alessandro; Bellosta von Colbe, José; Dornheim, Martin; Klassen, Thomas

doi:10.3390/met9030349

Effect of the process parameters on the energy transfer during the synthesis of the 2LiBH₄-MgH₂ reactive hydride composite for hydrogen storage

Publication date

2019-03-19

Document type

Forschungsartikel

Author

Jepsen, Julian

Capurso, Giovanni

Puszkiel, Julián A.

Busch, Nina

Werner, Tobias

Milanese, Chiara

Girella, Alessandro

Bellosta von Colbe, José

Dornheim, Martin

Klassen, Thomas

Organisational unit

Werkstoffkunde

DOI

10.3390/met9030349

URI

https://openhsu.ub.hsu-hh.de/handle/10.24405/21585

Publisher

MDPI

Series or journal

Metals

ISSN

2075-4701

Periodical volume

9

Periodical issue

3

Article ID

349

Part of the university bibliography

✅

Language

English

Keyword

Hydrogen storage

LiBH4/MgH2

Metal hydrides

Borohydrides

Reactive hydride composites

High-energy milling

Abstract

Several different milling parameters (additive content, rotation velocity, ball-to-powder ratio, degree of filling, and time) affect the hydrogen absorption and desorption properties of a reactive hydride composite (RHC). In this paper, these effects were thoroughly tested and analyzed. The milling process investigated in such detail was performed on the 2LiH-MgB2 system doped with TiCl3. Applying an upgraded empirical model, the transfer of energy to the material during the milling process was determined. In this way, it is possible to compare the obtained experimental results with those from processes at different scales. In addition, the different milling parameters were evaluated independently according to their individual effect on the transferred energy. Their influence on the reaction kinetics and hydrogen capacity was discussed and the results were correlated to characteristics like particle and crystallite size, specific surface area, presence of nucleation sites and contaminants. Finally, an optimal value for the transferred energy was determined, above which the powder characteristics do not change and therefore the RHC system properties do not further improve.

Description

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Published version

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