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Hydrogen storage properties of non stoichiometric AB 2 type alloys, Ti 0.8 Zr 0.2 (MnCrVFe) 2- x ( x =0, 0.1, 0.2, 0.3), have been studied. The results show that the structures of the substoichiometric alloys can be described using the replacement model, that is, some A side atoms occupy the primary B side atom positions. The equilibrium pressures of the alloys decrease gradually and the hysteresis effect between hydriding and dehydriding process decreases with the increase of x value. The free energy change (Δ G ) between hydriding and dehydriding process has a significant effect on the hysteresis of the alloys. The p c t plateau region becomes narrow and the reversible hydrogen capacity decreases with the increase of x value ( x >0.1), although the hydrogen absorption capacity increases. The alloy with x =0.1 shows the optimum hydrogen storage properties.
Hydrogen storage properties of non stoichiometric AB 2 type alloys, Ti 0.8 Zr 0.2 (MnCrVFe) 2 x (x = 0, 0.1, 0.2, 0.3), have been studied. The results show that the structures of the substoichiometric metals can be described using the replacement model, that is, some A side atoms occupy the primary B side atom positions. The equilibrium pressures of the alloys decrease gradually and the hysteresis effect between hydriding and dehydriding process decreases with the increase of x value. The free energy change ( ΔG) between hydriding and dehydriding processes has a significant effect on the hysteresis of the alloys. The pct plateau region becomes narrow and the reversible hydrogen capacity decreases with the increase of x value (x> 0.1), although the hydrogen absorption capacity increases. The alloy with x = 0.1 shows the optimum hydrogen storage properties.