Effect of impurity N2 concentration on the hydriding kinetics of Na-doped Mg–Ni alloys

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

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Abstract

Here, we report on the hydriding behaviour of various Mg–Ni alloys in the presence of N2gaseous impurities using in situ synchrotron XRD. We find that a N2content as low as 0.5 mol.% can completely inhibit the hydriding of pure Mg2Ni whereas the Na-modified equivalent remains relatively unaffected even at N2concentrations of up to 5 mol.%. The activated hypoeutectic Mg–Ni alloy demonstrates excellent hydriding kinetics compared to the as-cast counterpart under 1 mol.% of N2. Surface analysis shows it is the electropositive nature of a Na-modified Mg–Ni surface that facilitates selective adsorption of N2while leaving metallic Ni available for H2adsorption/dissociation. The results are important in designing Mg–Ni alloys with tailored properties that are suitable for use in hydrogen storage/purification/separation applications.

Original languageEnglish
Pages (from-to)366-375
Number of pages10
JournalInternational Journal of Hydrogen Energy
Volume42
Issue number1
DOIs
Publication statusPublished - Jan 5 2017

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All Science Journal Classification (ASJC) codes

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

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