C15-Structured Zr-Ti-Fe-Ni-V Alloys for High-Pressure Hydrogen Compression

Metal hydride hydrogen compressors (MHHC) offer unique advantages over conventional mechanical compressors in high-pressure hydrogen refueling. In this study, we developed C15-structured Zr-Ti-Fe-Ni-V single-phase alloys for high-pressure hydrogen compression. By designing the alloy compositions—high Ni and low V—and employing a quenching process, the resulting ZrFe2-based alloys exhibit reduced hydriding/dehydriding plateau hysteresis and slope, along with a narrow hydrogen solid solution zone. Notably, the Zr0.8Ti0.2Fe1.2Ni0.7V0.1 alloy elevates the hydrogen pressure from 128.3 atm to 334.5 atm within 283–353 K, delivering an effective hydrogen capacity of 1.02 wt.%. Similarly, the Zr0.9Ti0.1Fe1.2Ni0.7V0.1 alloy increases the hydrogen pressure from 60.4 atm to 221.8 atm across 283–363 K, with a capacity of 0.81 wt.%. This work provides a rational strategy for designing ZrFe2-based alloys for efficient hydrogen compression and storage applications.