Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 887, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.161181
Keywords
Hydrogen storage; V-Ti alloy; BCT hydride; Plateau pressure; Cycle durability
Categories
Funding
- National Key R&D Program of China [2018YFB1502105]
- Youth Fund of GRINM Group Co., Ltd.
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V-based hydrogen storage alloys are considered promising materials for high hydrogen capacity under ambient conditions. The addition of Fe or Al affects the hydrogen storage capacity and desorption plateau pressure. The relationship between lattice parameters, electron density, and hydrogen capacity is discussed. The optimized 75 V-Ti-15Cr-1Al-1Fe alloy shows high hydrogen storage capacity, pressure, and excellent cyclic performance.
V-based hydrogen storage alloys are considered promising materials with high hydrogen capacity under ambient conditions. 75 V-Ti-15Cr alloys with different Fe and Al addition (1-3 at%) have been investigated. All the alloys are confirmed to show body-centered tetragonal (BCT) structure after dehydrogenated at room temperature. The PCT tests manifest that the hydrogen storage capacity decreases and desorption plateau pressure rises with the content of Fe or Al. The relationship between the hydrogen storage property and lattice parameters of BCT phase is discussed. Also, the relationship between hydrogen capacity and electron density is analyzed. Among the studied alloys, the 75 V-Ti-15Cr-1Al-1Fe alloy shows optimal hydrogen storage capacity (2.26 wt%) and plateau pressure (0.5 MPa) at room temperature. Cycle test proves that the optimized 75 V-Ti-15Cr-1Al-1Fe alloy possesses excellent durability and the retention rate of hydrogen capacity can achieve 97% after 100 cycles. The slight capacity attenuation possibly results from the derivation of lattice defects and small contraction of the hydrogen absorption phases. (c) 2021 Published by Elsevier B.V.
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