Abstract
This thesis is focused on the hydrogen storage properties of the TiFeMn alloy. The formation of interstitials
hydrides and the characteristics of TiFeMn are studied. In order to investigate the morphology
of this material before and after activation with hydrogen, a scanning electron microscope with
an energy dispersive X-Ray Spectroscopy probe is used. Furthermore, the thermodynamic properties
of the process of hydrogenation and dehydrogenation are investigated through a PCT Pro 2000 device,
running several cycles at different temperatures, in the range from 30°C to 90°C, under hydrogen
pressure up to 50 bar. The volume expansion of the metal lattice during the processes is observed
through a physical change in the morphology of the powder. The numerous PCI measurements done
with activated powder of TiFeMn have shown a maximal gravimetric capacity of 1,54 wt.% at 30°C.
The sloping behaviour of the plateau for each measurement have made the calculation of the values
for enthalpy and entropy at different concentration for the system more meaningful.
