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Development of Fe-containing BCC hydrogen storage alloys with high vanadium concentration.
- Source :
-
Journal of Alloys & Compounds . Oct2023, Vol. 958, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- Vanadium-based alloys are promising hydrogen storage materials which reversibly absorb hydrogen > 2.0 wt% under ambient conditions. In present study, we systematically investigated the V-Ti-Cr-Fe quaternary alloys with V concentration of 65–80 at% and discussed the relationship between hydrogen sorption properties and lattice parameter (a) and valence electron density (e/a). When 3.023 ≤ a ≤ 3.031 Å and e/a ≤ 5.12, the alloys show the hydrogen desorption amount ≥ 2.30 wt% and desorption plateau pressure ≥ 0.1 MPa at 298 K. More interestingly, compared to the Fe-free V 75 -Ti-Cr (Ti/Cr = 0.9) alloy, addition of 1–3 at% Fe could improve the hydrogen desorption amount and plateau pressure. The optimized alloy, V 75 -Ti-Cr-Fe 2 (Ti/Cr = 0.9), shows a reversible hydrogen capacity of 2.46 wt% at 298 K in the 1st cycle and the capacity retention rate of 96 % after 100 cycles. • Presence of 1–3 at% Fe improves hydrogen desorption properties of BCC alloys. • V 75 -Ti-Cr-Fe 2 shows a high desorption capacity of 2.46 wt% at 298 K. • V-Ti-Cr-Fe alloy exhibits the capacity retention rate of 96 % after 100 cycles. • Appropriate range of lattice parameter and valence electron density are determined. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09258388
- Volume :
- 958
- Database :
- Academic Search Index
- Journal :
- Journal of Alloys & Compounds
- Publication Type :
- Academic Journal
- Accession number :
- 163931837
- Full Text :
- https://doi.org/10.1016/j.jallcom.2023.170294