Effect of trace Na additions on the hydriding kinetics of hypo-eutectic Mg–Ni alloys

Xuan Quy Tran, Stuart D. McDonald, Qinfen Gu, Xin Fu Tan, Kazuhiro Nogita

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Mg–Ni alloys are among the most promising candidates for solid-state hydrogen storage systems. This paper reveals the effect of Na doping in accelerating initial hydrogen uptake in Mg–Ni alloys using in-situ Synchrotron X-ray powder diffraction. A minimum concentration of approximately 0.2 wt.% Na must be achieved for the alloys to show reasonably fast hydriding kinetics. Surface analysis shows that a Na-modified Mg–Ni surface facilitates the chemisorption and dissociation of hydrogen molecules in the early stage of hydriding as evidenced by a rapid formation of the saturated hydrogen solid solution Mg2NiH0.3 from the original Mg2Ni. The subsequent hydrogen absorption is based on a mechanism of nucleation and growth of MgH2 where a high density of dislocations develops ahead of the growing hydride-metal interface.

Original languageEnglish
Pages (from-to)6851-6861
Number of pages11
JournalInternational Journal of Hydrogen Energy
Volume42
Issue number10
DOIs
Publication statusPublished - Mar 9 2017

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

Cite this