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Transformation Kinetics of LiBH₄–MgH₂ for Hydrogen Storage

Jin, Ou ; Shang, Yuanyuan ; Huang, Xiaohui ; Szabó, Dorothée Vinga ; Le, Thi Thu ; Wagner, Stefan ; Klassen, Thomas ; Kübel, Christian ; Pistidda, Claudio ; Pundt, Astrid (2022):
Transformation Kinetics of LiBH₄–MgH₂ for Hydrogen Storage. (Publisher's Version)
In: Molecules, 27 (20), MDPI, e-ISSN 1420-3049,
DOI: 10.26083/tuprints-00022837,

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Item Type: Article
Origin: Secondary publication DeepGreen
Status: Publisher's Version
Title: Transformation Kinetics of LiBH₄–MgH₂ for Hydrogen Storage
Language: English

The reactive hydride composite (RHC) LiBH₄–MgH₂ is regarded as one of the most promising materials for hydrogen storage. Its extensive application is so far limited by its poor dehydrogenation kinetics, due to the hampered nucleation and growth process of MgB₂. Nevertheless, the poor kinetics can be improved by additives. This work studied the growth process of MgB₂ with varying contents of 3TiCl₃·AlCl₃ as an additive, and combined kinetic measurements, X-ray diffraction (XRD), and advanced transmission electron microscopy (TEM) to develop a structural understanding. It was found that the formation of MgB₂ preferentially occurs on TiB₂ nanoparticles. The major reason for this is that the elastic strain energy density can be reduced to ~4.7 × 10⁷ J/m³ by creating an interface between MgB₂ and TiB₂, as opposed to ~2.9 × 10⁸ J/m³ at the original interface between MgB₂ and Mg. The kinetics of the MgB₂ growth was modeled by the Johnson–Mehl–Avrami–Kolmogorov (JMAK) equation, describing the kinetics better than other kinetic models. It is suggested that the MgB₂ growth rate-controlling step is changed from interface- to diffusion-controlled when the nucleation center changes from Mg to TiB₂. This transition is also reflected in the change of the MgB₂ morphology from bar- to platelet-like. Based on our observations, we suggest that an additive content between 2.5 and 5 mol% 3TiCl₃·AlCl₃ results in the best enhancement of the dehydrogenation kinetics.

Journal or Publication Title: Molecules
Volume of the journal: 27
Issue Number: 20
Place of Publication: Darmstadt
Publisher: MDPI
Collation: 15 Seiten
Uncontrolled Keywords: hydrogen storage, transmission electron microscopy, crystallography, reactive hydride composite, additive, phase transformation
Classification DDC: 500 Naturwissenschaften und Mathematik > 540 Chemie
600 Technik, Medizin, angewandte Wissenschaften > 660 Technische Chemie
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
Date Deposited: 07 Nov 2022 12:12
Last Modified: 15 Nov 2022 14:54
DOI: 10.26083/tuprints-00022837
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-228378
Additional Information:

This article belongs to the Special Issue Advances in Hydrogen Storage Materials for Energy Utilization 2.0

SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/22837
PPN: 501621113
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