2025/04/09 by Francesca Garelli, Erika Michela Dematteis, Garelli, Francesca +15
Materials Science · Energy · #Hydrogen Storage and Materials #Hydrogen embrittlement and corrosion behaviors in metals #Hybrid Renewable Energy Systems
paper · pdf · doi:10.48550/arxiv.2504.06990
This study investigates the activation behavior of TiFe0.80-X0.20 (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 °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 TiCr2 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.