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

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

doi:10.1016/j.ijhydene.2015.11.068

Author(s)

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

Detail(s)

Original language	English
Pages (from-to)	1725-1735
Journal / Publication	International Journal of Hydrogen Energy
Volume	41
Issue number	3
Online published	19 Dec 2015
Publication status	Published - 21 Jan 2016

Link(s)

DOI	DOI https://doi.org/10.1016/j.ijhydene.2015.11.068 Final Published version
	Check@CityULib
Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-84954380320&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(1db8c1f6-ca82-4c99-b0f3-ed8e84775a78).html

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, Ce_2.92Mg_91.84Ni_5.24 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 Ce_2.92Mg_91.84Ni_5.24-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 Ce_2.92Mg_91.84Ni_5.24 gradually transformed into CeH_2.51, (Mg) (with solid solution of H atoms) and Mg₂NiH_0.3, finally transformed into CeH_2.51, 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)

[ RIS ] [ BibTeX ]

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 Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review

Wu, K-B, Luo, Q, Chen, S-L, Gu, Q-F, Chou, K-C, Wang, X-L & Li, Q 2016, 'Phase equilibria of Ce-Mg-Ni ternary system at 673 K and hydrogen storage properties of selected alloy', International Journal of Hydrogen Energy, vol. 41, no. 3, pp. 1725-1735. https://doi.org/10.1016/j.ijhydene.2015.11.068

Wu, K-B., Luo, Q., Chen, S-L., Gu, Q-F., Chou, K-C., Wang, X-L., & Li, Q. (2016). Phase equilibria of Ce-Mg-Ni ternary system at 673 K and hydrogen storage properties of selected alloy. International Journal of Hydrogen Energy, 41(3), 1725-1735. https://doi.org/10.1016/j.ijhydene.2015.11.068

Wu K-B, Luo Q, Chen S-L, Gu Q-F, Chou K-C, Wang X-L et al. Phase equilibria of Ce-Mg-Ni ternary system at 673 K and hydrogen storage properties of selected alloy. International Journal of Hydrogen Energy. 2016 Jan 21;41(3):1725-1735. Epub 2015 Dec 19. doi: 10.1016/j.ijhydene.2015.11.068

Wu, Kong-Bao ; Luo, Qun ; Chen, Shuang-Lin et al. / Phase equilibria of Ce-Mg-Ni ternary system at 673 K and hydrogen storage properties of selected alloy. In: International Journal of Hydrogen Energy. 2016 ; Vol. 41, No. 3. pp. 1725-1735.