Publications Details

Phase Evolution of Complex Metal Hydrides During De/Rehydrogenation

White, James L.; Ohigashi, Takuji; Ray, Keith G.; Liu, Yi-Sheng; Stavila, Vitalie S.; Allendorf, Mark D.; Guo, Jinghua

Lightweight complex metal hydrides are of interest for use as energy-dense on-board vehicular hydrogen stores. One material of particular interest, magnesium borohydride (Mg(BH₄)₂), has very high hydrogen capacity, at 14.9 wt.% H, but suffers from slow kinetics and the need for extreme conditions for both dehydrogenation and rehydrogenation from magnesium diboride (MgB₂). In order to establish methods to improve the kinetic properties of this system, a greater understanding of the nucleation and growth of various solid phases is essential.