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Improving hydrogen storage properties of MgH2 by addition of alkali hydroxides

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作者:Wang, H (Wang, H.)^[1,2 ]; Zhang, J (Zhang, J.)^[1,2 ]; Liu, JW (Liu, J. W.)^[1,2 ]; Ouyang, LZ (Ouyang, L. Z.)^[1,2 ]; Zhu, M (Zhu, M.)^[1,2 ]

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虎门体育官方登录入口网:摘要

会议:13th China Hydrogen Energy Conference (CHEC) / 5th Mainland, Taiwan and Hong Kong Symposium on Hydrogen Energy

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In this study, alkali hydroxides (NaOH, LOH, KOH) were attempted as new-type catalytic additives to improve the hydrogen storage properties of MgH2 by ball milling. It is shown that the additives readily react with the MgH2 to form perovskite-structured NaMgH3 and KMgH3, but not the LiMgH3. Although the in-situ formed perovskite hydrides remain stable during hydriding/dehydriding cycles, both NaMgH3 and KMgH3 show predominant catalytic role on the hydriding and dehydriding of MgH2. In contrast, the LiOH modified MgH2 presents much inferior sorption kinetics because of the absence of LiMgH3. The catalytic mechanism of perovskite hydrides can be explained by the high hydrogen mobility in the perovskite structure. This study shows that such cheap hydroxides could be used as efficient catalysts to improve the hydrogen storage properties of high-capacity metal hydrides and complex hydrides. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

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虎门体育官方登录入口网:出版商

PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND

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