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Hydrogen storage properties and mechanisms of as-cast, homogenized and ECAP processed Mg98.5Y1Zn0.5 alloys containing LPSO phase

Author

Listed:
  • Zhang, J.
  • Yao, Y.
  • He, L.
  • Zhou, X.J.
  • Yu, L.P.
  • Lu, X.Z.
  • Peng, P.

Abstract

In this work, three different states (as-cast, homogenized and ECAP processed) of Mg98.5Y1Zn0.5 alloys with high theoretical hydrogen storage capacity (7.2 wt%) were prepared and comminuted into chips by filing. Then their hydrogen storage properties and underlying mechanisms were systematically investigated through experimental and first-principles calculations approaches. The results show that the activation properties of these alloys are enhanced in the order of homogenized, as-cast and ECAP processed states, which is closely associated with the size of filed chips. After activation, the as-cast and ECAP processed samples exhibit the superior hydrogen adsorption/desorption kinetics compared with the homogenized one. Interestingly, the as-cast sample presents the similar or even better kinetics relative to the ECAP processed one. This should be attributed to the more uniform dispersion of in-situ formed YH2 nanohydride in the as-cast alloy, which remarkably boosts the reversible hydrogen storage properties of Mg matrix by the synergistic pinning and catalytic effects. First-principles calculations reveal that the doping of Y not only reduces the activation energy of H2 dissociation on Mg surface, but also decreases the hydrogen removal energy of H atom from MgH2 bulk, which accounts well for the excellent hydrogen sorption kinetics of Mg98.5Y1Zn0.5 alloys.

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  • Zhang, J. & Yao, Y. & He, L. & Zhou, X.J. & Yu, L.P. & Lu, X.Z. & Peng, P., 2021. "Hydrogen storage properties and mechanisms of as-cast, homogenized and ECAP processed Mg98.5Y1Zn0.5 alloys containing LPSO phase," Energy, Elsevier, vol. 217(C).
    • Handle: RePEc:eee:energy:v:217:y:2021:i:c:s0360544220324221
    DOI: 10.1016/j.energy.2020.119315
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