Double-phase titanium-based high-entropy hydrogen storage alloy with low-temperature efficient hydrogen storage performance and preparation and application of double-phase titanium-based high-entropy hydrogen storage alloy
By adopting a biphasic titanium-based high-entropy hydrogen storage alloy, the two phase synergistic effect of coexisting two different sets of C14 Laves phase structures is solved, and the existing high-entropy hydrogen storage alloys are poorly stored in low temperature conditions is achieved, achieving efficient low-temperature hydrogen absorption and discharge performance and good cycle stability.
Patent Information
- Application Number
- CN202411598823.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2025-03-18
AI Technical Summary
The existing AB2 high-entropy hydrogen storage alloy with Laves-type structure is difficult to achieve high hydrogen storage capacity, cycle stability and excellent hydrogen absorption and discharge performance under mild conditions, especially in the low-temperature dehydrogenation behavior, which requires new phase change pathways.
A biphasic titanium-based high-entropy hydrogen storage alloy is used, and its chemical expression is TiaZrbCrcMndNieVfFeg. By smelting raw materials and forming two different hexagonal C14-type Laves phase structures, the coexistence of C14-I phase and C14-II phase produces a biphasic synergistic effect, reducing the energy barrier for hydrogen absorption and release reaction.
The saturation capacity of 1.83 wt% H2 can be quickly reached at 0°C without activation treatment, and desorbed 1.77 wt% H2 at the starting dehydrogenation temperature of 20°C, with a dehydrogenation rate greater than 96.7%, and showed good hydrogen absorption and release cycle stability. After 20 cycles, the capacity retention rates of hydrogen absorption and release can reach 97.8% and 97.0% respectively.