Design of a nanometric AlTi additive for MgB₂-based reactive hydride composites with superior kinetic properties

Le, Thi-Thu; Pistidda, Claudio; Puszkiel, Julián; Castro Riglos, María Victoria; Karimi, Fahim; Skibsted, Jørgen; GharibDoust, SeyedHosein Payandeh; Richter, Bo; Emmler, Thomas; Milanese, Chiara; Santoru, Antonio; Hoell, Armin; Krumrey, Michael; Gericke, Eike; Akiba, Etsuo; Jensen, Torben R.; Klassen, Thomas; Dornheim, Martin

doi:10.1021/acs.jpcc.8b01850

Design of a nanometric AlTi additive for MgB₂-based reactive hydride composites with superior kinetic properties

Publication date

2018-03-21

Document type

Forschungsartikel

Author

Le, Thi-Thu

Pistidda, Claudio

Puszkiel, Julián

Castro Riglos, María Victoria

Karimi, Fahim

Skibsted, Jørgen

GharibDoust, SeyedHosein Payandeh

Richter, Bo

Emmler, Thomas

Milanese, Chiara

Santoru, Antonio

Hoell, Armin

Krumrey, Michael

Gericke, Eike

Akiba, Etsuo

Jensen, Torben R.

Klassen, Thomas

Dornheim, Martin

Organisational unit

Werkstoffkunde

Angewandte Werkstofftechnik

DOI

10.1021/acs.jpcc.8b01850

URI

https://openhsu.ub.hsu-hh.de/handle/10.24405/21569

Publisher

American Chemical Society (ACS)

Series or journal

The Journal of Physical Chemistry C

ISSN

1932-7447

Periodical volume

122

Periodical issue

14

First page

7642

Last page

7655

Part of the university bibliography

✅

Language

English

Abstract

Solid-state hydride compounds are a promising option for efficient and safe hydrogen-storage systems. Lithium reactive hydride composite system 2LiBH₄ + MgH₂/2LiH + MgB₂ (Li-RHC) has been widely investigated owing to its high theoretical hydrogen-storage capacity and low calculated reaction enthalpy (11.5 wt % H₂ and 45.9 kJ/mol H₂). In this paper, a thorough investigation into the effect of the formation of nano-TiAl alloys on the hydrogen-storage properties of Li-RHC is presented. The additive 3TiCl₃·AlCl₃ is used as the nanoparticle precursor. For the investigated temperatures and hydrogen pressures, the addition of ∼5 wt % 3TiCl₃·AlCl₃ leads to hydrogenation/dehydrogenation times of only 30 min and a reversible hydrogen-storage capacity of 9.5 wt %. The material containing 3TiCl₃·AlCl₃ possesses superior hydrogen-storage properties in terms of rates and a stable hydrogen capacity during several hydrogenation/dehydrogenation cycles. These enhancements are attributed to an in situ nanostructure and a hexagonal AlTi₃ phase observed by high-resolution transmission electron microscopy. This phase acts in a 2-fold manner, first promoting the nucleation of MgB₂ upon dehydrogenation and second suppressing the formation of Li₂B₁₂H₁₂ upon hydrogenation/dehydrogenation cycling.

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Published version

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