Hydriding kinetics of nano-phase composite hydrogen storage alloys prepared by mechanical alloying of Mg and MmNi 5-x (CoAlMn) x

M Zhu; Y Gao; X. Z. Che; Y. Q. Yang; C. Y. Chung

doi:10.1016/S0925-8388(01)01517-1

Author(s)

M Zhu
Y Gao
X. Z. Che
Y. Q. Yang
C. Y. Chung

Detail(s)

Original language	English
Pages (from-to)	708-713
Journal / Publication	Journal of Alloys and Compounds
Volume	330-332
Publication status	Published - 17 Jan 2002

Conference

Title	Proceedings of the International Symposium on Metal-Hydrogen (MH 2000)
Place	Australia
City	Noosa Heads, QLD
Period	1 - 6 October 2000

Link(s)

DOI	DOI https://doi.org/10.1016/S0925-8388(01)01517-1 Final Published version
	Check@CityULib
Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-0037122516&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(568df107-00c5-4ce6-9805-8de132d33981).html

Abstract

Nano-phase composite hydrogen storage alloys were prepared by mechanical alloying of Mg and MmNi _5-x(CoAlMn) _x. The hydrogen absorption kinetics of the nano-phase composite and melted MmNi _5-x(CoAlMn) _x alloys were measured under isobaric conditions at different temperatures. The obtained hydrogen absorption kinetic curves were fitted using various rate equations to reveal the mechanism of the hydriding reaction process. The results showed that the hydriding reaction kinetics of the nano-phase composite and melted MmNi _5-x(CoAlMn) _x were different. For the nano-phase composite, the hydriding reaction was in agreement with an auto-catalysis process. For the melted MmNi _5-x(CoAlMn) _x, the hydride reaction was in agreement with a nucleation and growth process. The difference in hydriding kinetics of the two alloys is discussed based on the fitting results and the microstructural characteristics of the alloys. © 2002 Published by Elsevier Science B.V.