Influence of the substitution of V by Nb in the structure and properties of hydrogen absorption/desorption of TiCr1.1V0.9 alloy

The partial substitution of V by Nb in the TiCr1.1V0.9 alloy was performed generating four different compounds. The thermal stability, the hydrogen storage capacity as well as the kinetics of absorption/desorption were studied. It was observed that the addition of Nb decreases the hydrogen absorption capacity from 3.6 wt% to 2.5 wt%, but it increases the kinetic. The desorption performance improves above 373 K.

► The substitution of V by Nb in TiCrV bcc alloys was studied.
► It was found three compositions that lead to the formation of C14 Laves phase.
► The addition of Nb induces an increase in the lattice parameters and a decrease in hydrogen absorption capacity due to the formation of Laves phase.
► At the same time, this phase acts as a catalyst leading to better hydrogen absorption and desorption kinetics.