Analysis of the surface condition of Ti4Fe2Ox

Influence of TiB2 addition upon thermal stability and decomposition temperature of the MgH2 hydride of a Mg-based mechanical alloy

“…For a number of hydride-forming alloys based on transition and rare-earth metals it has been established [23][24][25] that their XPS O 1s core-level spectra can be decomposed on two features (lines) positioned at about 530 and 532 eV. The feature at 530 eV is attributed to oxygen atoms belonging to a surface oxide layer while that at 532 eV is ascribed to oxygen atoms belonging to oxygen-containing structures, catalytic toxic substances [23,25].…”

“…The feature at 530 eV is attributed to oxygen atoms belonging to a surface oxide layer while that at 532 eV is ascribed to oxygen atoms belonging to oxygen-containing structures, catalytic toxic substances [23,25]. Such structures adsorbed on alloy surfaces can block catalytic active centers and can prevent the dissociation of molecular hydrogen.…”

Influence of Ti, Mn, Fe, and Ni addition upon thermal stability and decomposition temperature of the MgH2 phase of alloys synthesized by reactive mechanical alloying

“…For a number of hydride-forming alloys based on transition and rare-earth metals it has been established [17][18][19][20] that their XPS O 1s core-level spectra can be decomposed on two features (lines) positioned at about 530 eV and 532 eV. The feature at 530 eV is attributed to oxygen atoms belonging to a surface oxide layer while that at 532 eV is ascribed to oxygen atoms belonging to oxygen-containing structures, catalytic toxic substances.…”

“…The feature at 530 eV is attributed to oxygen atoms belonging to a surface oxide layer while that at 532 eV is ascribed to oxygen atoms belonging to oxygen-containing structures, catalytic toxic substances. Such structures adsorbed on alloy surfaces can block catalytic active centers and can prevent the dissociation of molecular hydrogen [17,19]. Therefore, the XPS O 1s core-level spectra presented in Fig.…”

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.…”