Investigation of Hydrogen Storage Properties on Ti0.8Zr0.2Cr0.8Mn(VFe)0.2 Alloy by Melt Spinning

Ti-based AB 2 -type hydrogen storage alloys are known for their high capacity and moderate plateau pressure, yet their widespread applications are limited by significant slope and hysteresis factors. In this article, we developed an advanced Ti 0.8 Zr 0.2 Cr 0.8 Mn(VFe) 0.2 alloy through a combined approach of arc melting and melt spinning to overcome these limitations. The melt-spinning treatment induced substantial microstructural modifications, including a reduction in the unit cell volume and enhanced compositional homogeneity, which collectively led to improved kinetics, as evidenced by a marked reduction in t 0.9 . Systematic optimization of spinning parameters yielded significant improvements in hysteresis and plateau characteristics, with the most pronounced enhancement achieved at 5 m/s. At this optimal spinning speed, the alloy exhibited a 26.5% reduction in the slope factor ( S f, from 0.98 to 0.72) and a 29.4% decrease in the hysteresis factor ( H f, from 0.51 to 0.36) at 25 °C. While the melt-spinning process slightly reduced the hydrogen storage capacity due to decreased cell volume, it substantially improved the thermodynamic properties, as evidenced by a 20.9% reduction in dehydrogenation enthalpy (Δ H ) from 26.06 to 20.60 kJ/mol at 5 m/s, indicating decreased hydride stability. These findings not only demonstrate an effective strategy for optimizing hydrogen storage properties through microstructure engineering but also provide valuable insights and inspiration for the development of cost-effective hydrogen storage materials.