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 Zr_0.8Ti_0.2Fe_1.2Ni_0.7V_0.1 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 Zr_0.9Ti_0.1Fe_1.2Ni_0.7V_0.1 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.