Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 33, Issue 21, Pages 6188-6194Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2008.07.029
Keywords
Hydrogen storage materials; Ball-milling; Dehydrogenation kinetics; LiNH2; Mg(NH2)(2)
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Funding
- Ministry of New and Renewable Energy (MNRE)
- DST (UNANST), New Delhi (India)
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We have investigated the ball-milling (5-45 h) followed by dehydrogenation kinetics of LiNH2-MgH2 mixture. A new result of ball-milling reveals the formation of Mg(NH2)(2) for mixtures ball-milled for more than 15 h. The desorption kinetics has been found to improve appreciably by increasing the duration of milling from 5 to 45 h. This enhancement is attributed to formation of Mg(NH2)(2) during this process. It was found that the Mg(NH2)(2) form through the reaction 2LiNH(2) + MgH2 -> Mg(NH2)(2) + 2LiH. The phase and microstructural characterizations have been done through X-ray diffraction, IR-spectrometry, transmission and scanning electron microscopy. Correlation between particle size and hydrogenation behavior has also been investigated. (C) 2008 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
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