@article{18f52e4d9eac41149f74b0c9862db41c,
title = "Evidence of the hydrogen release mechanism in bulk MgH2",
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.",
author = "Kazuhiro Nogita and Tran, {Xuan Q.} and Tomokazu Yamamoto and Eishi Tanaka and McDonald, {Stuart D.} and Gourlay, {Christopher M.} and Kazuhiro Yasuda and Syo Matsumura",
note = "Funding Information: This research was supported by a JSPS Fellowship for Research in Japan (S11730), a Kyushu University Short-term Young Scholar Exchange Program, a Smart Futures Fellowship from the Queensland Government, Australia and by Hydrexia Pty. Ltd. We thank Mr. Takahiro Nogita at Film School, Griffith University for video editing, Dr. Qinfen Gu at the Australian Synchrotron for assistance with XRD experiments (AS093/PD1726, AS102/PD/QLD/ FI2488 and AS131/PD5782), and the ANFF-Q and CMM at the University of Queensland for use of the DSC and SEM facilities. Funding Information: Supplementary information accompanies this paper at http://www.nature.com/ scientificreports Competing financial interests: K.N. holds a patent on modification of hypoeutectic Mg-Ni alloys with alkali and alkali-earth metals (K. Nogita and A. K. Dahle, {\textquoteleft}{\textquoteleft}Magnesium Alloys for Hydrogen Storage{\textquoteright}{\textquoteright}, International Patent Application No: WO 2006/060851, 2/12/2005) which resulted in a spin-off company Hydrexia Pty. Ltd. which is working to build a commercial H-storage system from this technology. This letter is about the fundamental mechanisms of dehydriding of MgH2 and is not related to the claims of the patent and has no direct financial implications on the work of Hydrexia Pty. Ltd. K.N. also supervises an ongoing research project at the University of Queensland funded by Hydrexia Pty. Ltd. Funding Information: This research was supported by a JSPS Fellowship for Research in Japan (S11730), a Kyushu University Short-term Young Scholar Exchange Program, a Smart Futures Fellowship from the Queensland Government, Australia and by Hydrexia Pty. Ltd. We thank Mr. Takahiro Nogita at Film School, Griffith University for video editing, Dr.Qinfen Gu at the Australian Synchrotron for assistance with XRD experiments (AS093/PD1726, AS102/PD/QLD/ FI2488 and AS131/PD5782), and the ANFF-Q and CMM at the University of Queensland for use of the DSC and SEM facilities.",
year = "2015",
month = feb,
day = "13",
doi = "10.1038/srep08450",
language = "English",
volume = "5",
journal = "Scientific reports",
issn = "2045-2322",
publisher = "Nature Publishing Group",
}