Thermal activation of hydride-forming alloys based on TiFe intermetallic compound

Electronic structure of Ti4Fe2O as determined from first-principles APW + LO calculations and X-ray spectroscopy data

“…It is well known that the TiFe system and its derivative alloys are of great technological importance for energy storage [4,5]. However, TiFe-based alloys demand the activation heating for their hydrogen sorption (e.g., about 400 • C for TiFe and Ti 1.1 Fe, 300-350 • C for Ti 1.1 Fe 0.9 Mn 0.1 , about 100 • C for Ti 1.1 Fe 0.8 Ni 0.1 Cu 0.1 [4,6,7]). The literature data [2,[8][9][10] reveal that the ternary oxygen-stabilized Ti 4−x Fe 2+x O y compounds can absorb hydrogen even at room temperature without preliminary thermal activation.…”