Investigation on Ti-Zr-Cr-Fe-V based alloys for metal hydride hydrogen compressor at moderate working temperatures

Ti0.85Zr0.17Cr1.2-xFe0.8Vx (x = 0-0.2), Ti0.85Zr0.17Cr1.2-yFe0.7+yV0.1 (y = 0-0.25) and Ti0.87- zZr0.15+zCr0.95Fe0.95V0.1 (z = 0-0.04) alloys for metal hydride hydrogen compressor at moderate working temperatures were prepared by induction levitation melting. Their microstructures and hydrogen storage properties were systematically investigated. The results show that all Ti-Zr-Cr-Fe-Vbased alloys have a single C14 Laves phase structure. As the Vcontent in the Ti0.85Zr0.17Cr1.2-xFe0.8Vx (x = 0-0.2) alloys increases, better activation kinetics and larger hydrogen storage capacity are achieved, while the plateau pressure decreases and the plateau slope factor increases. Similarly, the hydrogen storage capacity, the plateau pressure and the plateau slope factor of the Ti0.87-zZr0.15+zCr0.95Fe0.95V0.1 (z = 0-0.04) alloys vary identically with Zr content increasing. Conversely, these three properties vary oppositely with increasing Fe content in the Ti0.85Zr0.17Cr1.2-yFe0.7+yV0.1 (y = 0-0.25) alloys. Among the studied alloys, Ti0.85Zr0.17Cr0.95Fe0.95V0.1 possesses the best overall properties for the designed moderate hydrogen compression application. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

The Ti-Zr-Cr-Fe-V alloys with different compositions exhibit good hydrogen storage properties at moderate working temperatures. Increasing the V content is beneficial for activation kinetics and higher hydrogen storage capacity, but it reduces plateau pressure and increases plateau slope factor. The Zr and Fe content in the alloys also significantly affect hydrogen storage properties.