Cyclic hydrogen absorption–desorption characteristics of TiCrV and alloys

The cyclic hydrogen absorption–desorption characteristics of TiCrV and Ti 0.8 Cr 1.2 V alloys are investigated. Experimental results show that the cyclic hydrogen capacity increases with increasing hydrogen-desorption temperature for both TiCrV and Ti 0.8 Cr 1.2 V alloys. The Ti 0.8 Cr 1.2 V and TiCrV alloys can maintain steady cyclic hydrogen capacities of about 2.5 wt% and 2.0 wt%, respectively, even after 15 cycles with hydrogen absorption at 25 ∘ C and hydrogen desorption at 400 ∘ C . The hydrogenation for both TiCrV and Ti 0.8 Cr 1.2 V alloys includes the processes of first saturated solid-solution and then forming TiCr 1.8 H 5.3 and TiH 2 hydrides. The TiCr 1.8 H 5.3 hydride has better reversibility than TiH 2 hydride during the hydrogen absorption–desorption.