Journal
SCRIPTA MATERIALIA
Volume 127, Issue -, Pages 102-107Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2016.09.011
Keywords
Hydrogen storage; Nanocomposite; Long period stacking ordered structure; In-situ synchrotron X-ray diffraction; Transmission electron microscope
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Funding
- Shanghai Municipal Education Commission
- Shanghai Education Development Foundation [13SG39]
- Science and Technology Committee of Shanghai [14521100603]
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In-situ synchrotron X-ray diffraction (SR-XRD) combined with transmission electron microscope (TEM) and first-principle calculations was employed to reveal the mechanism of hydrogen-induced decomposition of 18R-type long period stacking ordered (LPSO) structure. 80 wt.% of the structure was decomposed by 0.05 MPa H-2 at 280 degrees C in 90 min, producing 6 wt.% Mg, 50 wt.% MgH2, 15 wt.% YH2, 9 wt.% Mg2Ni, and 3 wt% Mg2NiH4. The formation of YH2 nanoparticles is the fastest process due to the strong interaction between hydrogen atoms and dispersive L1(2)-Ni6Y8 clusters. Furthermore, the metastable Mg6Ni nanocrystals, which transformed to Mg2Ni and Mg nanoparticles, was detected. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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