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arXiv · 2504.06990

Enhancing TiFe Alloy Activation for Hydrogen Storage Through Al, Cr, Co, and Cu Substitutions as a Step Towards Future Recycling

Francesca Garelli·Erika Michela Dematteis·Vitalie Stavila·Giuseppe Di Florio·Claudio Carbone·Alessandro Agostini·Mauro Palumbo·Marcello Baricco·Paola Rizzi
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Abstract

This study investigates the activation behavior of $TiFe_{0.80}$-$X_{0.20}$ (X = Co, Cu, Cr, Al) alloys to identify the most effective materials for producing hydrogen storage alloys from recycled sources in view of a circular economy perspective. Activation was tested using two methods: a Sievert Volumetric Apparatus at room temperature and 64 bar of hydrogen, and high-pressure differential scanning calorimetry with 50 bar hydrogen under thermal cycles up to 400 {\deg}C. Activation properties were analyzed by assessing time for incubation and for full charging, that are influenced, respectively, by surface and bulk diffusion of hydrogen. Results showed that Cr-substituted alloys are rapidly activated, due to the presence of $TiCr_{2}$ compound, while Al-containing alloys absorbed hydrogen immediately. In contrast, Co- and Cu-substituted alloys required extended activation times, due to less quantity of secondary phases and limited diffusion channels.

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Francesca Garelli, Erika Michela Dematteis, Vitalie Stavila, Giuseppe Di Florio, Claudio Carbone, Alessandro Agostini, Mauro Palumbo, Marcello Baricco, Paola Rizzi. 2025-04-09. Enhancing TiFe Alloy Activation for Hydrogen Storage Through Al, Cr, Co, and Cu Substitutions as a Step Towards Future Recycling. https://arxiv.org/abs/2504.06990

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