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Hydrogen induced amorphization of LaMgNi4 phase in metal hydride alloys

Published

Author(s)

Leonid A. Bendersky, Haoting Shen, Kwo Young, Taihei Ouchi

Abstract

Hydrogen induced amorphization (HIA) of the LaMgNi4 phase at 30C was found in three LaMgNi4/LaNi5 two-phase metal hydride (MH)-forming alloys. The amorphization happened at the first dehydrogenation cycle from a fully hydrided alloy, and the process is reversible after annealing at 250C for 1 h. The hydrogen storage capacity of the LaMgNi4 phase in an amorphous state is higher than in its crystalline form. A scanning electron microscope study did not observe any significant changes in the shape of grains as a consequence of HIA and re-crystallization. A transmission electron microscope study confirmed the amorphous structure of the LaMgNi4 phase after HIA. These findings suggest a new way to improve the performance of MH alloys when used in electrochemical applications.
Citation
International Journal of Hydrogen Energy

Keywords

Hydrogen absorbing alloys, Hydrogen induced amorphization, Metal hydride electrode, Transmission electron microscope, Re-crystallization
Created August 3, 2015, Updated March 17, 2017