Journal
SCRIPTA MATERIALIA
Volume 62, Issue 9, Pages 701-704Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2010.01.033
Keywords
Hydrogen storage; Hydrides; Microstructure; In situ transmission electron microscopy
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Funding
- Hydrogen Energy RD Center
- Ministry of Education, Science and Technology of Korea
- Korea Institute of Industrial Technology(KITECH) [B0009787] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [23-2009-08-001-00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Microstructural changes in NbF5-doped MgH2 during the dehydrogenation reaction (MgH2 --> Mg + H-2) have been investigated by in situ heating transmission electron microscopy. Nanocrystalline MgH2 shows fast hydrogen sorption kinetics, as well as a high density of defects induced by high-energy ball milling. Since the network-structured Nb layer covering Mg grains acts both as an impediment to grain growth of Mg and a gateway for hydrogen diffusion by forming metastable NbH1-x the improved kinetics can be maintained during hydrogen cycling. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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