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

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^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

36 Citations (Scopus)

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.

Original language	English
Pages (from-to)	1725-1735
Journal	International Journal of Hydrogen Energy
Volume	41
Issue number	3
Online published	19 Dec 2015
DOIs	https://doi.org/10.1016/j.ijhydene.2015.11.068
Publication status	Published - 21 Jan 2016

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SDG 7 Affordable and Clean Energy

Research Keywords

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

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10.1016/j.ijhydene.2015.11.068

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@article{1db8c1f6ca824c99b0f3ed8e84775a78,

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

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.",

keywords = "Ce-Mg-Ni system, Kinetic mechanism, Phase equilibria, Phase transformation, Thermodynamic property",

author = "Kong-Bao Wu and Qun Luo and Shuang-Lin Chen and Qin-Fen Gu and Kuo-Chih Chou and Xun-Li Wang and Qian Li",

year = "2016",

month = jan,

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doi = "10.1016/j.ijhydene.2015.11.068",

language = "English",

volume = "41",

pages = "1725--1735",

journal = "International Journal of Hydrogen Energy",

issn = "0360-3199",

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}

TY - JOUR

T1 - Phase equilibria of Ce-Mg-Ni ternary system at 673 K and hydrogen storage properties of selected alloy

AU - Wu, Kong-Bao

AU - Luo, Qun

AU - Chen, Shuang-Lin

AU - Gu, Qin-Fen

AU - Chou, Kuo-Chih

AU - Wang, Xun-Li

AU - Li, Qian

PY - 2016/1/21

Y1 - 2016/1/21

N2 - 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.

AB - 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.

KW - Ce-Mg-Ni system

KW - Kinetic mechanism

KW - Phase equilibria

KW - Phase transformation

KW - Thermodynamic property

UR - https://www.scopus.com/pages/publications/84954380320

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-84954380320&origin=recordpage

U2 - 10.1016/j.ijhydene.2015.11.068

DO - 10.1016/j.ijhydene.2015.11.068

M3 - RGC 21 - Publication in refereed journal

SN - 0360-3199

VL - 41

SP - 1725

EP - 1735

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

IS - 3

ER -

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

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