X-ray absorption study of Ti-activated sodium aluminum hydride

Graetz, J.; Reilly, J.J.; Johnson, J.; Ignatov, A. Yu.; Tyson, T.A.
July 2004
Applied Physics Letters;7/19/2004, Vol. 85 Issue 3, p500
Academic Journal
Ti K-edge x-ray absorption near-edge spectroscopy was used to explore the Ti valence and coordination in Ti-activated sodium alanate. An empirical relationship was established between the Ti valence and the Ti K-edge onset based on a set of standards. This relationship was used to estimate oxidation states of the titanium catalyst in 2 and 4 mol % Ti-doped NaAlH4. The results demonstrate that the formal titanium valence is zero in doped sodium alanate and nearly invariant during hydrogen cycling. A qualitative comparison of the edge fine structure suggests that the Ti is present on the surface in the form of amorphous TiAl3.


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