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Synthesis of planar-sheet graphite fluorides using fluorometallate salts of transition metals in anhydrous hydrogen fluoride

Authors
Journal
Carbon
0008-6223
Publisher
Elsevier
Publication Date
Volume
31
Issue
3
Identifiers
DOI: 10.1016/0008-6223(93)90131-s
Keywords
  • Graphite
  • Intercalation
  • Fluorometallate
  • Hf
  • Cxf
Disciplines
  • Chemistry
  • Physics

Abstract

Abstract Planar-sheet graphite fluorides, C x F, are prepared at ambient temperature by the reaction of graphite with the transition fluorometallates K 2MnF 6 and K 2NiF 6 in anhydrous hydrogen fluoride (AHF). In the case of K 2MnF 6, this represents the first chemical route to graphite fluorides without use of elemental fluorine. For each reagent, the net reactions are identified by stoichiometry and X-ray diffraction of the solid products. The graphite fluorides generated at the oxidation limit have stoichiometries close to C 6F and C 2F for the Mn 4+ and Ni 4+ fluorometallates, respectively. Na 3FeF 6 will also oxidize graphite to C x F in AHF, although homogeneous products were not obtained due to rapid solvolysis of the fluorometallate. CoF 3 and KF react in AHF to release F 2. C x F is produced when graphite is reacted with this oxidizing combination. The reactions and oxidation limits are discussed in terms of a thermodynamic model for graphite intercalation. A synthetic strategy for the preparation of planar-sheet graphite fluorides in organic solvents is proposed.

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