Fundamental hydrogen storage properties of TiFe-alloy with partial substitution of Fe by Ti and Mn
Publication date
2021-04-20
Document type
Forschungsartikel
Author
Dematteis, Erika Michela
Dreistadt, David Michael
Capurso, Giovanni
Cuevas, Fermin
Latroche, Michel
Organisational unit
Project
Fundamental hydrogen storage properties of TiFe-alloy with partial substitution of Fe by Ti and Mn
Publisher
Elsevier
Series or journal
Journal of Alloys and Compounds
ISSN
Periodical volume
874
Article ID
159925
Part of the university bibliography
✅
Language
English
Keyword
Hydrogen storage
Intermetallic compound
TiFe
Thermodynamics
Abstract
TiFe intermetallic compound has been extensively studied, owing to its low cost, good volumetric hydrogen density, and easy tailoring of hydrogenation thermodynamics by elemental substitution. All these positive aspects make this material promising for large-scale applications of solid-state hydrogen storage. On the other hand, activation and kinetic issues should be amended and the role of elemental substitution should be further understood. This work investigates the thermodynamic changes induced by the variation of Ti content along the homogeneity range of the TiFe phase (Ti:Fe ratio from 1:1–1:0.9) and of the substitution of Mn for Fe between 0 and 5 at%. In all considered alloys, the major phase is TiFe-type together with minor amounts of TiFe2 or β-Ti-type and Ti4Fe2O-type at the Ti-poor and rich side of the TiFe phase domain, respectively. Thermodynamic data agree with the available literature but offer here a comprehensive picture of hydrogenation properties over an extended Ti and Mn compositional range. Moreover, it is monstrated that Ti-rich alloys display enhanced storage capacities, as long as a limited amount of β-Ti is formed. Both Mn and Ti substitutions increase the cell parameter by possibly substituting Fe, lowering the plateau pressures and decreasing the hysteresis of the isotherms. A full picture of the dependence of drogen storage properties as a function of the composition will be discussed, together with some observed correlations.
Version
Published version
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