Surface segregation in FeTi and its catalytic effect on the hydrogenation II: AES and XPS studies

Synergistic effects of co-dopants on the dehydrogenation kinetics of sodium aluminum hydride

“…It is also probably not a coincidence that Anton [19] categorizes Fe and other related metals such as Cu and Co as only moderately active catalysts for the dehydrogenation of NaAlH 4 , which is consistent with their diminished ability to form hydrides [47]. However, it is well known that alloying some of these metals together produces stable and cyclable metal hydrides, like TiFe [40][41][42][43][44].…”

“…Formation of a TiFe alloy presents one possibility; on the other hand, other scenarios should be considered. A plethora of information in the literature supports the ability of Fe to enhance the performance of Ti, whether through the use of Fe to enhance the hydriding ability of Ti [40][41][42][43][44], or even to enhance the performance of Ti as a catalyst in the hydrogenation/dehydrogenation of organic compounds [45,46], possibly through the formation of redox pairs. It is probably not a coincidence that Ti, Zr and V (in this order) show the best activities with complex hydrides [19], which exactly coincides with the ability of these metals to form hydrides [47].…”

Combustion synthesis of TiFe by utilizing magnesiothermic reduction

“…However, for practical use, TiFe requires a severe activation treatment because an oxidation film is always generated on its surface and prevents TiFe from storing hydrogen. Many researches on such activation treatments have been reported [2][3][4][5][6][7]. In a typical activation treatment, the pulverized alloy is heated to a high temperature (over 623 K) in vacuum, and is then pressurized with hydrogen at 4.0 MPa in order to allow hydrogenation.…”

Self-ignition combustion synthesis of TiFe1−xMnx hydrogen storage alloy

“…Even worse, TiFe has dual plateaus in the PCT diagram, where the equilibrium pressure of -hydride is different from that of -hydride. For this reason, the difference in pressure for hydrogenating and dehydrogenating is relatively large [2][3][4][5].…”