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Microstructural Study of MgB2 in the LiBH4-MgH2 Composite by Using TEM

Jin, Ou ORCID iD icon 1,2; Shang, Yuanyuan; Huang, Xiaohui 2; Mu, Xiaoke 2; Szabó, Dorothée Vinga ORCID iD icon 1,2,3; Le, Thi Thu; Wagner, Stefan 1; Kübel, Christian ORCID iD icon 2,3; Pistidda, Claudio; Pundt, Astrid 1,4
1 Institut für Angewandte Materialien – Werkstoffkunde (IAM-WK), Karlsruher Institut für Technologie (KIT)
2 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)
3 Karlsruhe Nano Micro Facility (KNMF), Karlsruher Institut für Technologie (KIT)
4 Institut für Nanotechnologie (INT)

Abstract:

The hampered kinetics of reactive hydride composites (RHCs) in hydrogen storage and release, which limits their use for extensive applications in hydrogen storage S1and energy conversion, can be improved using additives. However, the mechanism of the kinetic restriction and the
additive effect on promoting the kinetics have remained unclear. These uncertainties are addressed by utilizing versatile transmission electron microscopy (TEM) on the LiBH4-MgH2 composite under the influence of the 3TiCl3∙AlCl3 additives. The formation of the MgB2 phase, as the rate-limiting step, is emphatically studied. According to the observations, the heterogeneous nucleation of MgB2 relies on different nucleation centers (Mg or TiB2 and AlB2). The varied nucleation and growth of MgB2 are related to the in-plane strain energy density at the interface, resulting from the atomic misfit between MgB2 and its nucleation centers. This leads to distinct MgB2 morphologies (bars and platelets) and different performances in the dehydrogenation kinetics of LiBH4-MgH2. It was found that the formation of numerous MgB2 platelets is regarded as the origin of the kinetic improvement. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000146913
Veröffentlicht am 01.06.2022
Originalveröffentlichung
DOI: 10.3390/nano12111893
Scopus
Zitationen: 5
Web of Science
Zitationen: 5
Dimensions
Zitationen: 5
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Karlsruhe Nano Micro Facility (KNMF)
Institut für Angewandte Materialien – Werkstoffkunde (IAM-WK)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 01.06.2022
Sprache Englisch
Identifikator ISSN: 2079-4991
KITopen-ID: 1000146913
HGF-Programm 38.05.01 (POF IV, LK 01) Anthropogenic Carbon Cycle
Weitere HGF-Programme 43.35.03 (POF IV, LK 01) Structural and Functional Behavior of Solid State Systems
Erschienen in Nanomaterials
Verlag MDPI
Band 12
Heft 11
Seiten 1893
Projektinformation PU131/16-1 (DFG, DFG EIN, PU 131/16-1)
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 31.05.2022
Schlagwörter hydrogen storage; transmission electron microscopy; crystallography; reactive hydride composite; additive
Nachgewiesen in Scopus
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Web of Science
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