Effect of trace Na additions on the hydrogen absorption kinetics of Mg2Ni

Tran, Xuan Quy, McDonald, Stuart D., Gu, Qinfen, Matsumura, Syo and Nogita, Kazuhiro (2016) Effect of trace Na additions on the hydrogen absorption kinetics of Mg2Ni. Journal of Materials Research, 31 9: 1316-1327. doi:10.1557/jmr.2016.123


Author Tran, Xuan Quy
McDonald, Stuart D.
Gu, Qinfen
Matsumura, Syo
Nogita, Kazuhiro
Title Effect of trace Na additions on the hydrogen absorption kinetics of Mg2Ni
Formatted title
Effect of trace Na additions on the hydrogen absorption kinetics of Mg2Ni
Journal name Journal of Materials Research   Check publisher's open access policy
ISSN 2044-5326
0884-2914
Publication date 2016-05-14
Year available 2016
Sub-type Article (original research)
DOI 10.1557/jmr.2016.123
Open Access Status Not Open Access
Volume 31
Issue 9
Start page 1316
End page 1327
Total pages 12
Place of publication New York, NY United States
Publisher Cambridge University Press
Language eng
Formatted abstract
It is demonstrated that Na doping can significantly improve the hydriding performance of Mg2Ni under an isobaric-isothermal condition of 2 MPa H2 and 350 °C. This is achieved via an increase of the interphase grain boundary area and density of dislocations as compared to the Na-free material. Significant enrichment of Na+ cations on the alloys' surface coupled with the catalytic effect of metallic Ni are suggested to increase the hydrogen–metal bonding strength facilitating hydrogen adsorption/dissociation. The mechanisms of hydrogen absorption are discussed based on a nucleation and growth theory. Additionally, by means of in situ synchrotron powder x-ray diffraction, the transition of Mg2Ni into the stable Mg2NiH0.3 is observed in real-time.
Keyword Mg
Hydrogenation
Energy storage
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
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