Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 114, Issue 46, Pages 19862-19866Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp107911u
Keywords
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Funding
- Department of Energy through Basic Energy Sciences [DE-FG02-ER46256]
- National Science Foundation (NSF) [9724240]
- MRSEC of the NSF [DMR-520565]
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LiBH4 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 degrees 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 LiBH4 in a porous carbon aerogel nanoscaffold. Magic-angle spinning (MAS) NMR of C-13 in a C-13-enriched sample finds the C-60 has reacted already in the as-mixed (unheated) material. Dehydriding and rehydriding result in further C-13 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.
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