Evidence of the hydrogen release mechanism in bulk MgH2

Nogita, Kazuhiro, Tran, Xuan Q., Yamamoto, Tomokazu, Tanaka, Eishi, McDonald, Stuart D., Gourlay, Christopher M., Yasuda, Kazuhiro and Matsumura, Syo (2015) Evidence of the hydrogen release mechanism in bulk MgH2. Scientific Reports, 5 8450: 1-5. doi:10.1038/srep08450

Author Nogita, Kazuhiro
Tran, Xuan Q.
Yamamoto, Tomokazu
Tanaka, Eishi
McDonald, Stuart D.
Gourlay, Christopher M.
Yasuda, Kazuhiro
Matsumura, Syo
Title Evidence of the hydrogen release mechanism in bulk MgH2
Formatted title
Evidence of the hydrogen release mechanism in bulk MgH2
Journal name Scientific Reports   Check publisher's open access policy
ISSN 2045-2322
Publication date 2015-02-13
Year available 2015
Sub-type Article (original research)
DOI 10.1038/srep08450
Open Access Status DOI
Volume 5
Issue 8450
Start page 1
End page 5
Total pages 5
Place of publication London, United Kingdom
Publisher Nature Publishing Group
Language eng
Subject 1000 General
Abstract In a comment on our Article "Evidence of the hydrogen release mechanism in bulk MgH", Surrey et al. assert that the MgH sample we studied was not MgH at any time but rather MgO; and that the transformation we observed was the formation of Kirkendall voids due to the outward diffusion of Mg. We address these issues in this reply.
Formatted abstract
Hydrogen has the potential to power much of the modern world with only water as a by-product, but storing hydrogen safely and efficiently in solid form such as magnesium hydride remains a major obstacle. A significant challenge has been the difficulty of proving the hydriding/dehydriding mechanisms and, therefore, the mechanisms have long been the subject of debate. Here we use in situ ultra-high voltage transmission electron microscopy (TEM) to directly verify the mechanisms of the hydride decomposition of bulk MgH2 in Mg-Ni alloys. We find that the hydrogen release mechanism from bulk (2 μm) MgH2 particles is based on the growth of multiple pre-existing Mg crystallites within the MgH2 matrix, present due to the difficulty of fully transforming all Mg during a hydrogenation cycle whereas, in thin samples analogous to nano-powders, dehydriding occurs by a ‘shrinking core’ mechanism.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2016 Collection
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Citation counts: TR Web of Science Citation Count  Cited 17 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 21 times in Scopus Article | Citations
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