Improved Dehydrogenation Properties of Ti-Doped LiAlH4: Role of Ti Precursors
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The dehydrogenation properties of LiAlH 4 doped with different Ti precursors (Ti, TiO 2, and TiCl 3) via ball milling are investigated. The results not only show significant decreases in the decomposition temperatures (T dec) and activation energies (E A) of the first two dehydrogenation reaction steps of LiAlH 4 by doping with TiO 2 or TiCl 3, but also reveal how each Ti precursor affects the dehydrogenation process. Although doping LiAlH 4 with TiCl 3 induced the largest decrease in T dec and E A, TiO 2-doped LiAlH 4 produced a decrease in T dec and E A that is quite close to the TiCl 3-doped sample as well as superior short-term stability, suggesting that doping with TiO 2 has certain advantages over doping with TiCl 3. Further, the underlying mechanisms associated with the Ti precursors during the dehydrogenation reaction of LiAlH 4 have been studied using quasi in situ X-ray photoelectron spectroscopy. The results reveal that the Ti 4+ and Ti 3+ reduction processes and the segregation of Li cations to the surface of LiAlH 4 during ball milling play critical roles in the improved dehydrogenation properties observed. 2012 American Chemical Society.
The Journal of Physical Chemistry C
author list (cited authors)
Amama, P. B., Grant, J. T., Shamberger, P. J., Voevodin, A. A., & Fisher, T. S.