期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 34, 期 4, 页码 1951-1957出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2008.12.040
关键词
Hydrogen storage materials; La2Mg17; Hydrogen absorption; Kinetics mechanism; Model
资金
- National High Technology Research and Development Program of China [2007AA05Z118]
- National Natural Science Foundation of China [50804029]
- Foundation for the Author of National Excellent Doctoral Dissertation of P.R. China [200746]
- Program for Changjiang Scholars and innovative Research Team in University [IRT0739]
- Innovation Fund for Graduate Student of Shanghai University
A new model has been successfully used to investigate the hydrogen absorption kinetics mechanism of La2Mg17-based composites. The results indicate that different preparation conditions lead to different rate-controlling steps during hydrogen absorption process. For La2Mg17-LaNi5 composite synthesized by the method of melting, the rate-controlling step is the surface penetration of hydrogen atoms, which does not change by addition agent (LaNi5). However, mechanical milling can change the rate-limiting steps of hydriding reaction in the La2Mg17-LaNi5 composite from surface penetration to diffusion of hydrogen in the hydride layer. With the enhancement of milling intensity, the rate-controlling step in La1.8Ca0.2Mg14Ni3 alloy changes from surface penetration to diffusion. in addition, the activation energies of hydrogen absorption for La2Mg17-20wt%LaNi5 and La1.8Ca0.2Mg14Ni3 are obtained by this model. (c) 2008 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
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