87,195,196 Intense studies on the Ti–Ni system revealed a decreasing trend for HER activity in the order TiNi 2 > TiNi 3 > TiNi 4 > Ti 2 Ni > TiNi > Ti 3 Ni > TiNi 0.7 in which only TiNi 3 exhibited the highest activity. 197 The Raney nickel system with Ni 3 Al as analogous to TiAl with a similar face-centered cubic unit cell as well as structural order has also been investigated as the catalyst material for HER. 198 Early reported phase pure Ni 2 Al 3 and NiAl 3 with minor impurities of Ni 2 Al 3 were tested in 1 M KOH for HER activity and demonstrated good activity and stability.
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Perspective on intermetallics towards efficient electrocatalytic water-splitting.
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