Notable hydrogen storage in Ti–Zr–V–Cr–Ni high entropy alloy

Abstract

In the present investigation, we discussed the synthesis, structural and hydrogen storage behavior of high-entropy Ti–Zr–V–Cr–Ni equiatomic intermetallic alloy. This alloy was synthesized by arc melting in an argon atmosphere where base pressure was in the order of 10−5 atm before purging with argon gas. The X-ray diffraction study revealed that the alloy is C14 type hexagonal Laves phase. The pressure composition isotherms (PCI) of this alloy were investigated with pressure ranges at 0–40 atmosphere. The total hydrogen storage capacities were found to be 1.52 wt%. The reversible hydrogen storage capacity was quite stable and only slight decreases in the storage capacity was observed after 10 cycles during hydrogen soaking. The demonstrations of hydrogen storage capacity of the Ti–Zr–V–Cr–Ni equiatomic alloy were thus established, indicating the future potential of developing this class of high entropy intermetallic based materials for hydrogen storage. © 2022 Hydrogen Energy Publications LLC