Phase equilibria of Ce-Mg-Ni ternary system at 673 K and hydrogen storage properties of selected alloy

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Kong-Bao Wu
  • Qun Luo
  • Shuang-Lin Chen
  • Qin-Fen Gu
  • Kuo-Chih Chou
  • Qian Li

Detail(s)

Original languageEnglish
Pages (from-to)1725-1735
Journal / PublicationInternational Journal of Hydrogen Energy
Volume41
Issue number3
Online published19 Dec 2015
Publication statusPublished - 21 Jan 2016

Abstract

The isothermal section of Ce-Mg-Ni ternary system at 673 K was constructed through thermodynamic calculation coupled with experimental verification. Under guidance of the phase diagram in Mg-rich corner, Ce2.92Mg91.84Ni5.24 was designed to investigate its hydrogen storage properties. Moreover, the mechanism of α-to-β (α: diluted phase and β: hydride) phase transformation in the Ce2.92Mg91.84Ni5.24-H2 system was elucidated by in situ synchrotron powder X-ray diffraction (SR-PXRD). The alloy showed a good activated ability and displayed two plateaus in the pressure-composition-temperature curves. The kinetic mechanisms of hydriding and dehydriding reactions were analyzed by Chou model. The rate-controlling steps were the diffusion for the initial stage in hydriding reaction and the surface penetration for dehydriding reaction. SR-PXRD patterns indicated that the activated Ce2.92Mg91.84Ni5.24 gradually transformed into CeH2.51, (Mg) (with solid solution of H atoms) and Mg2NiH0.3, finally transformed into CeH2.51, MgH2 and Mg2NiH4 during the first hydriding process.

Research Area(s)

  • Ce-Mg-Ni system, Kinetic mechanism, Phase equilibria, Phase transformation, Thermodynamic property

Citation Format(s)

Phase equilibria of Ce-Mg-Ni ternary system at 673 K and hydrogen storage properties of selected alloy. / Wu, Kong-Bao; Luo, Qun; Chen, Shuang-Lin et al.
In: International Journal of Hydrogen Energy, Vol. 41, No. 3, 21.01.2016, p. 1725-1735.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review