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

Xuan Quy Tran, Stuart D. McDonald, Qinfen Gu, Syo Matsumura, Kazuhiro Nogita

研究成果: Contribution to journalArticle

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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.

ジャーナルJournal of Materials Research
出版物ステータス出版済み - 5 14 2016

All Science Journal Classification (ASJC) codes

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

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