In situ transmission electron microscopy study on microstructural changes in NbF5-doped MgH2 during dehydrogenation

Title
In situ transmission electron microscopy study on microstructural changes in NbF5-doped MgH2 during dehydrogenation
Authors
김지우안재평김도현정희석심재혁조영환오규환
Keywords
Hydrogen storage; MgH2; Catalyst; NbF5; Transmission electorn miscroscopy; Ball milling; Microstructure; Hydrides
Issue Date
2010-05
Publisher
Scripta materialia
Citation
VOL 62, NO 9, 701-704
Abstract
Microstructural changes in NbF5-doped MgH2 during the dehydrogenation reaction (MgH2 →Mg + H2) 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.
URI
http://pubs.kist.re.kr/handle/201004/37199
ISSN
1359-6462
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KIST Publication > Article
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