Phase transformation, thermodynamics and kinetics property of Mg90Ce5RE5 (RE = La, Ce, Nd) hydrogen storage alloys.
In: Journal of Materials Science & Technology, Jg. 51 (2020-08-15), S. 84-93
Online
serialPeriodical
Zugriff:
The Mg 90 Ce 5 RE 5 (RE = La, Ce, Nd) alloys were prepared by a vacuum induction furnace and their microstructure, phase transformation, thermodynamics and kinetics property were systematically studied by XRD, SEM, TEM, and PCT characterization methods. The result shows that the activated alloys are composed of Mg/MgH 2 and corresponding REH 2+ x with nanoscale. The REH 2+ x grain with Ce and La or Nd functional group have lower nucleation potential barriers than CeH 2+ x grains as the nucleation location, thus improve the hydrogen absorption kinetics of these alloys among which the Mg 90 Ce 5 Nd 5 alloy can absorb 90% of the hydrogen within 2 min at 320 ºC. In addition, the Mg 90 Ce 10 alloy has the lowest activation energy with 103.2 kJ mol −1 and the fastest desorption kinetics, which can release 5 wt% of the hydrogen within 20 min at 320 ºC. This is a correlation with grain size and the in-suit formed CeH 2.73 /CeO 2 interface. Moreover, the co-doping Ce and La or Nd can effectively disorganize the thermodynamic stability of Mg-based hydrogen storage alloys to a certain degree, but the dehydrogenation kinetics of that still is restricted by the recombination energy of hydrogen ions on the surface. [ABSTRACT FROM AUTHOR]
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Titel: |
Phase transformation, thermodynamics and kinetics property of Mg90Ce5RE5 (RE = La, Ce, Nd) hydrogen storage alloys.
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Autor/in / Beteiligte Person: | Yong, Hui ; Guo, Shihai ; Yuan, Zeming ; Qi, Yan ; Zhao, Dongliang ; Zhang, Yanghuan |
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Zeitschrift: | Journal of Materials Science & Technology, Jg. 51 (2020-08-15), S. 84-93 |
Veröffentlichung: | 2020 |
Medientyp: | serialPeriodical |
ISSN: | 1005-0302 (print) |
DOI: | 10.1016/j.jmst.2020.02.042 |
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