Evidence of the hydrogen release mechanism in bulk MgH2

Kazuhiro Nogita, Xuan Q. Tran, Tomokazu Yamamoto, Eishi Tanaka, Stuart D. McDonald, Christopher M. Gourlay, Kazuhiro Yasuda, Syo Matsumura

Research output: Contribution to journalArticle

32 Citations (Scopus)

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.

Original languageEnglish
Article number8450
JournalScientific reports
Volume5
DOIs
Publication statusPublished - Feb 13 2015

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hydrogen
hydrides
crystallites
hydrogenation
magnesium
high voltages
decomposition
transmission electron microscopy
cycles
matrices
water

All Science Journal Classification (ASJC) codes

  • General

Cite this

Nogita, K., Tran, X. Q., Yamamoto, T., Tanaka, E., McDonald, S. D., Gourlay, C. M., ... Matsumura, S. (2015). Evidence of the hydrogen release mechanism in bulk MgH2. Scientific reports, 5, [8450]. https://doi.org/10.1038/srep08450

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; Matsumura, Syo.

In: Scientific reports, Vol. 5, 8450, 13.02.2015.

Research output: Contribution to journalArticle

Nogita, K, Tran, XQ, Yamamoto, T, Tanaka, E, McDonald, SD, Gourlay, CM, Yasuda, K & Matsumura, S 2015, 'Evidence of the hydrogen release mechanism in bulk MgH2', Scientific reports, vol. 5, 8450. https://doi.org/10.1038/srep08450
Nogita K, Tran XQ, Yamamoto T, Tanaka E, McDonald SD, Gourlay CM et al. Evidence of the hydrogen release mechanism in bulk MgH2. Scientific reports. 2015 Feb 13;5. 8450. https://doi.org/10.1038/srep08450
Nogita, Kazuhiro ; Tran, Xuan Q. ; Yamamoto, Tomokazu ; Tanaka, Eishi ; McDonald, Stuart D. ; Gourlay, Christopher M. ; Yasuda, Kazuhiro ; Matsumura, Syo. / Evidence of the hydrogen release mechanism in bulk MgH2. In: Scientific reports. 2015 ; Vol. 5.
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