Abstract
The effects of Ti substitution to the Zr site of ZrM2.1 (M=V0.1Ni0.53Mn0.32Fe0.05) have been investigated by pressure-composition isotherm measurements, X-ray powder diffraction and a half-cell electrochemical measurements. As Ti was increased, the plateau pressure was increased, though hydrogen-absorbing capacity was not changed.The crystal structures of Zr1-xTixM2.1 alloys with x≤0.1 were C15 type Laves phase, and that of alloys with x≥0.3 were C14 type.For the low current of 17mA/g, ZrM2.1 (x=0) alloy had the maximum discharge capacity of about 420mAh/g, and for the high current of 220mA/g, two alloys of ZrM2.1 (x=0) and Zr0.7Ti0.3M2.1 (x=0.3) had large discharge capacity of about 340mAh/g.The new alloy of Zr0.7Ti0.3M2.1 (x=0.3) with C14 phase had a good high-rate capability for discharge and an hydride-formation enthalpy (ΔH) of -36kJ/mol H2.
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