Hydrogen storage properties of the refractory Ti–V–Zr–Nb–Ta multi-principal element alloy

A new quinary multi-principal element alloy Ti0.30V0.25Zr0.10Nb0.25Ta0.10 was prepared by high temperature melting technique and the physicochemical as well as hydrogen sorption properties have been determined. The as-cast alloy crystallizes into a single-phase bcc lattice and can very quickly absorb hydrogen at room temperature forming a fcc hydride phase with capacity of 2 H/M (2.5 wt%). The absorption/desorption of hydrogen is reversible and occurs within one step, as proven by in-situ neutron diffraction for the desorption reaction. The capacity is slightly fading during the first 10 cycles and then stabilizes at around 2.2 wt% for the next 10 cycles.