High-entropy alloy TiV2ZrCrMnFeNi for hydrogen storage at room temperature with full reversibility and good activation

• Published in: Scripta materialia Vol. 238; p. 115774
• Main Authors: Dangwal, Shivam, Edalati, Kaveh
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.01.2024
• Subjects: Electron backscatter diffraction (EBSD); High-entropy alloys (HEAs); High-entropy hydrides; Metal hydrides; Solid-state hydrogen storage; Metal hydrides; Solid-state hydrogen storage; High-entropy hydrides; High-entropy alloys (HEAs); Electron backscatter diffraction (EBSD)
• ISSN: 1359-6462; 1872-8456
• DOI: 10.1016/j.scriptamat.2023.115774

The development of alloys that are hydrogenated and dehydrogenated quickly and actively at room temperature is a challenge for the safe and compact storage of hydrogen. In this study, a new high-entropy alloy (HEA) with AB-type configuration (A: hydride-forming elements, B: inert-to-hydrogen elements) was designed by considering valence electron concentration, electronegativity difference and atomic-size mismatch of elements. The alloy TiV2ZrCrMnFeNi had dual C14 Laves and BCC phases, in which C14 stored hydrogen and BCC/C14 interphase boundaries contributed to activation. The alloy absorbed 1.6 wt% of hydrogen at room temperature without any activation treatment and exhibited fast kinetics and full reversibility. [Display omitted]