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

International audienceA 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