Mechanism of improved hydrogen absorption kinetics in cast Mg-Ni alloys

Kazuhiro Nogita, Sean Ockert, Andrew Duguid, Jordan Pierce, Matthew Greaves

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

The potential for Mg and Mg-Ni alloys to be used as hydrogen storage alloys has been known for some time. Although the maximum storage capacity in these alloys is high (7.6wt%H2 for Mg and 3.4wt%H2 for Mg 2Ni), they have, until recently, been disregarded for practical applications due to their slow kinetics and high reaction temperatures. This paper discusses the recent discovery that the non-faceted/faceted hypo-eutectic Mg-Mg2Ni system can, similar to Al-Si eutectic alloys, be modified by trace additions and that this results in improved hydrogen storage properties. The hydrogen storage properties depend on the composition, including trace levels of modifying elements, and processing conditions. In alloys of optimal composition it has been shown that the reversible storage of 6.5-7wt% H 2 is possible at a rate of reaction that is far better than that previously documented. In addition, the alloy can be satisfactorily processed in air, as opposed to controlled atmospheric conditions. This paper discusses the mechanism of improved hydrogen absorption/desorption kinetics when eutectic Mg-Ni hypo-eutectic alloys are modified. This discussion is based on atomic scale analysis using electron microscopy and examination with synchrotron radiation.

Original languageEnglish
Title of host publication4th International Conference Organised by the CAST CRC, on Behalf of the Global Light Metals Alliance
Pages391-394
Number of pages4
DOIs
Publication statusPublished - Oct 5 2009
Event4th International Conference Organised by the CAST CRC, on Behalf of the Global Light Metals Alliance - Gold Coast, QLD, Australia
Duration: Jun 29 2009Jul 1 2009

Publication series

NameMaterials Science Forum
Volume618 619
ISSN (Print)0255-5476

Other

Other4th International Conference Organised by the CAST CRC, on Behalf of the Global Light Metals Alliance
CountryAustralia
CityGold Coast, QLD
Period6/29/097/1/09

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Nogita, K., Ockert, S., Duguid, A., Pierce, J., & Greaves, M. (2009). Mechanism of improved hydrogen absorption kinetics in cast Mg-Ni alloys. In 4th International Conference Organised by the CAST CRC, on Behalf of the Global Light Metals Alliance (pp. 391-394). (Materials Science Forum; Vol. 618 619). https://doi.org/10.4028/www.scientific.net/MSF.618-619.391