Hydrogen induced amorphization of LaMgNi4 phase in metal hydride alloys

Published: August 03, 2015

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
Pub Type: Journals

Keywords

Hydrogen absorbing alloys, Hydrogen induced amorphization, Metal hydride electrode, Transmission electron microscope, Re-crystallization
Created August 03, 2015, Updated March 17, 2017