Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5148095 | International Journal of Hydrogen Energy | 2017 | 10 Pages |
Abstract
Here, we report on the hydriding behaviour of various Mg-Ni alloys in the presence of N2 gaseous impurities using in situ synchrotron XRD. We find that a N2 content as low as 0.5Â mol.% can completely inhibit the hydriding of pure Mg2Ni whereas the Na-modified equivalent remains relatively unaffected even at N2 concentrations of up to 5Â mol.%. The activated hypoeutectic Mg-Ni alloy demonstrates excellent hydriding kinetics compared to the as-cast counterpart under 1Â mol.% of N2. Surface analysis shows it is the electropositive nature of a Na-modified Mg-Ni surface that facilitates selective adsorption of N2 while leaving metallic Ni available for H2 adsorption/dissociation. The results are important in designing Mg-Ni alloys with tailored properties that are suitable for use in hydrogen storage/purification/separation applications.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Xuan Quy Tran, Stuart D. McDonald, Qinfen Gu, Xin Fu Tan, Kazuhiro Nogita,