Effects of metal-based additives on dehydrogenation process of 2NaBH₄ + MgH₂ system
Publication date
2022-09-29
Document type
Forschungsartikel
Author
Shang, Yuanyuan
Jin, Ou
Karimi, Fahim
Dansirima, Palmarin
Sittiwet, Chongsutthamani
Utke, Rapee
Soontaranon, Siriwat
Le, Thi Thu
Gizer, Gökhan
Szabó, Dorothée Vinga
Wagner, Stefan
Kübel, Christian
Dornheim, Martin
Pundt, Astrid
Pistidda, Claudio
Organisational unit
Publisher
Elsevier
Series or journal
International Journal of Hydrogen Energy
ISSN
Periodical volume
47
Periodical issue
89
First page
37882
Last page
37894
Part of the university bibliography
✅
Language
English
Keyword
Hydrogen storage
Borohydrides
Nucleation and growth
Kinetic modeling
dtec.bw
Abstract
We report a systematic investigation of the effect that selected metal-based additives have on the dehydrogenation properties of the reactive hydride composite (RHC) model system 2NaBH4+MgH2. Compared to the pristine system, the material doped with 3TiCl3·AlCl3 exhibits superior dehydrogenation kinetics. The addition of 3TiCl3·AlCl3 alters the controlling mechanism of the second dehydrogenation step making it change from a two-dimensional interface controlled process to a two-dimensional nucleation and growth controlled process. The microstructural investigation of the dehydrogenated 2NaBH4+MgH2 via high-resolution transmission electron microscopy (HRTEM) shows significant differences in the MgB2 morphology formed in the doped and undoped systems. The MgB2 has a needle-like structure in the sample doped with 3TiCl3·AlCl3, which is different from the plate-like MgB2 structure in the undoped sample. Moreover, nanostructured metal-based phases, such as TiB2/AlB2 particles, acting as heterogeneous nucleation sites for MgB2 are also identified for the sample doped with 3TiCl3·AlCl3.
Version
Published version
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