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Graphite Intercalation Compounds Prepared in Hydrofluoric Acid

Published online by Cambridge University Press:  16 February 2011

X. Zhang  and
M.M. Lerner
X. Zhang
Affiliation:
Department of Chemistry and Center for Advanced Materials Research, Oregon State University, Corvallis, OR 97331-4003, [email protected]
M.M. Lerner
Affiliation:
Department of Chemistry and Center for Advanced Materials Research, Oregon State University, Corvallis, OR 97331-4003, [email protected]
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Abstract

The graphite intercalation compounds CxC8F17SO3 · yF and CxN(SO2CF3)2 are readily prepared under ambient conditions in 48 % hydrofluoric acid, using the oxidant K2MnF6. The product compositions are evaluated by mass uptake, TGA, and elemental analysis. PXRD peak position and peak width analyses indicate that the stable product CxC8F17SO3 · yF is obtained after 50 h. (x ≅ 18, y ≅ 4) and is comprised of a solid solution of stage 2 and 3. This material can be obtained within 1 h. at 50 °C. The addition of up to 83 vol. % conc. HNO3 or 17 % fuming H2SO4 produces a stage 2 intercalation compound within hours. Stage 2 CxN(SO2CF3)2 (x = 37) is obtained within 15 minutes under ambient condition in HF. The anion orientations for these GICs are evaluated by structural refinement. Larger anions containing –SO2CnF2n+1 substitutents can also be intercalated, although the reaction rates are very slow.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 547: Symposium DD – Solid-State Chemistry of Inorganic Materials II , 1998 , 521
Copyright
Copyright © Materials Research Society 1999

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