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MM: Fachverband Metall- und Materialphysik
MM 31: Topical Session: Hydrogen in Materials: from Storage to Embrittlement V
MM 31.4: Talk
Wednesday, March 20, 2024, 11:15–11:30, C 130
Hydrogen storage in porous FeTi nanofoams — •Lukas Schweiger1, Florian Spieckermann1, Nikolaos Kostoglou1, Sebastian Stock2, Peter Cengeri3, Michael Zehetbauer3, Oskar Paris2, Daniel Kiener1, and Jürgen Eckert1,4 — 1Montanuniversität Leoben, Department Materials Science, Austria — 2Montanuniversität Leoben, Chair of Physics, Austria — 3University of Vienna, Faculty of Physics, Austria — 4Austrian Academy of Sciences, Erich Schmid Institute, Austria
While metal hydrides are promising for hydrogen storage, challenges persist due to slow kinetics, inadequate stability, and unfavorable pressure-temperature conditions. A well-studied material is the intermetallic FeTi, qualifying as a good candidate to overcome these limitations. We intend to achieve this by prototyping a FeTi-based nanoporous metallic foam. Therefore, FeTi and Cu powders were blended, whereby Cu is removed after high-pressure torsion (HPT) processing. Detailed exploration of the FeTi-Cu system, including varying deformation temperature and Cu content, reveals optimal conditions for obtaining a homogeneous nanocrystalline composite. The process retains flexibility, providing tunability through temperature adjustments during HPT or subsequent heat treatments. Removing the Cu transforms the nanocomposite into a metallic nanofoam. Characterization via nitrogen ad-/desorption highlights a specific surface area of 17 m2/g and a well-defined mesoporous structure. Hydrogen absorption measurements reveal rapid and reversible hydrogen uptake, with the nanoporous FeTi maintaining mechanical stability.
Keywords: Hydrogen storage; Metal hydrides; High-pressure torsion; Nanocomposite; Nanoporous