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MM: Fachverband Metall- und Materialphysik
MM 23: Topical Session: Hydrogen in Materials: from Storage to Embrittlement III
MM 23.3: Talk
Tuesday, March 19, 2024, 12:30–12:45, C 130
Influence of Varying Conditions on Kinetics of Reactive Hydride Composites — •Ou Jin1,3, Yuanyuan Shang2, Xiaohui Huang3, Dorothée Vinga Szabó1,3,4, Thi Thu Le2, Stefan Wagner1, Christian Kübel3,4,5, Claudio Pistidda2, and Astrid Pundt1,3 — 1Institute for Applied Materials, KIT — 2Institute of Hydrogen Technology, hereon — 3Institute of Nanotechnology, KIT — 4Karlsruhe Nano Micro Facility, KIT — 5Joint Research Laboratory Nanomaterials, TUD
A sustainable energy future necessitates the incorporation of hydrogen as a critical energy vector. However, its widespread use is restricted by available storage techniques. The LiBH4-MgH2 composite, among the reactive hydride composites, possesses an exceptional storage capacity of about 12 wt% H2 while using milder operating conditions compared to current commercial solutions. However, the material's practical application is hindered by sluggish kinetics due to the slow formation of MgB2 during dehydrogenation. Facilitation of MgB2 formation was proposed through transition metal-based additives to expedite the LiBH4-MgH2 dehydrogenation. Despite of this, the mechanism underpinning these improvements was not fully explored at the time. This research investigates the effect of variables such as the kind of additive, annealing temperature, and cycling on the MgB2 formation during the decomposition of LiBH4-MgH2 using various transmission electron microscopy (TEM) techniques. The analysis reveals that the improved kinetics in the material results from the tuned nucleation and growth behavior of MgB2, due to different MgB2 nucleation behaviors.
Keywords: hydrogen storage; transmission electron microscopy; reactive hydride composite; additive; kinetics