期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 40, 期 35, 页码 11908-11916出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2015.04.111
关键词
Hydrogen storage materials; Magnesium; Milling under hydrogen; Storing and releasing rates; Ni and NbF5 addition
资金
- Basic Science Research Program through the National Research Foundation (NRF) of Korea - Ministry of Education, Science and Technology [2011-0023566]
- Chonbuk National University
- National Research Foundation of Korea [2011-0023566] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Milling under hydrogen was used to prepare samples with a composition of 80 wt% Mg + 14 wt% Ni + 6 wt% NbF5 (named 80Mg + 14Ni + 6NbP(5)). 80Mg + 14Ni + 6NbF(5) had a large effective storage capacity of hydrogen of approximately 5.6 wt% H. The activation of 80Mg + 14Ni + 6NbF(5) was done after one storing-releasing cycle. At n = 2 at 593 K, 80Mg + 14Ni + 6NbF(5) stored 3.92 and 5.57 wt% H after 2.5 and 60 min, respectively, under 12 bar H-2, and released 2.34 and 4.81 wt% H after 10 and 60 min, respectively, under 1.0 bar H-2. The following reaction happened during milling under hydrogen and at the early storing-releasing cycles: 14Mg + Ni + 4NbF(5) + 7H(2) -> MgH2 + Mg2NiH4 + Mg + 10MgF(2) + 4NbH(2). At a fairly low temperature of 423 K, the sample stored 0.28, 0.34, and 0.57 wt% H after 5, 10, and 60 min, respectively. The initial storing rate of 80Mg + 14Ni + 6NbF(5) increased as the temperature rose from the room temperature to 573 K since the effect of thermal activation is predominant, and fell as the temperature rose from 573 K to 623 K since the effect of decrease in the driving force for storing reaction is predominant. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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