Journal
MATERIALS
Volume 14, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/ma14020276
Keywords
hydrogen storage alloys; hydrogen-induced amorphization; Sc substitution; reversibility
Categories
Funding
- National Key R&D Program of China [2019YFB1502105]
- National Natural Science Foundation of China [U1601212, 51871098]
- Fund for Innovative Research Groups of the National Natural Science Foundation of China [51621001]
- Natural Science Foundation of Guangdong Province [2016A030312011]
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The addition of Sc element improves the hydrogen storage properties of Y0.95Ni2 alloy, reducing the degree of hydrogen-induced amorphization and enhancing the reversibility of hydrogenation and dehydrogenation processes.
Rare-earth-based AB(2)-type compounds with Laves phase structure are readily subject to hydrogen-induced amorphization and disproportionation upon hydrogenation. In this work, we conducted the Sc alloying on Y0.95Ni2 to improve its hydrogen storage properties. The results show that the amorphization degree of Y0.95Ni2 deepens with the increasing hydrogenation time, pressure, and temperature. The Y(Sc)(0.95)Ni-2 ternary compounds show a significant improvement in reversibility and dehydriding thermodynamics due to the reduced atomic radius ratio R-A/R-B and cell volume. Hydrogen-induced amorphization is fully eliminated in the Y0.25Sc0.7Ni2. The Y0.25Sc0.7Ni2 delivers a reversible hydrogen storage capacity of 0.94 wt.% and the dissociation pressure of 0.095 MPa at the minimum dehydrogenation temperature of 100 degrees C.
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