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Published November 25, 2010 | public
Journal Article

NMR Study of LiBH_4 with C_(60)

Abstract

LiBH_4 doped with 1.6 mol % well-dispersed C_(60) is studied with solid-state nuclear magnetic resonance (NMR). Variable-temperature hydrogen NMR shows large changes between the data upon first heating and after exposure to 300 °C. After heating, a large fraction on the order of 50% of the hydrogen signal appears in a motionally narrowed peak, similar to a previous report of LiBH_4 in a porous carbon aerogel nanoscaffold. Magic-angle spinning (MAS) NMR of ^(13)C in a ^(13)C-enriched sample finds the C_(60) has reacted already in the as-mixed (unheated) material. Dehydriding and rehydriding result in further ^(13)C spectral changes, with nearly all intensity being found in a broad peak corresponding to aromatic carbons. It thus appears that the previously reported improved dehydriding and rehydriding kinetics of this material at least partially result from in situ formation of a carbon framework. The method may offer a new route to dispersal of hydrides in carbon support structures.

Additional Information

© 2010 American Chemical Society. Received: August 20, 2010; Revised Manuscript Received: October 13, 2010. Publication Date (Web): November 3, 2010. We gratefully acknowledge support from the Department of Energy through Basic Energy Sciences Grant DE-FG02-ER46256. The NMR facility at Caltech was supported by the National Science Foundation (NSF) under Grant 9724240 and partially supported by the MRSEC Program of the NSF under Award DMR-520565.

Additional details

Created:
August 19, 2023
Modified:
October 20, 2023