Electrochemical Formation of a Covalent–Ionic Stage‑1 Graphite Intercalation Compound with Trifluoroacetic Acid

A pure
stage-1 graphite intercalation compound (GIC) has been prepared
by the electrochemical oxidation of graphite in trifluoroacetic acid
(CF3COOH). During the CF3COOH-GIC formation,
covalent as well as ionic bonds between the trifluoroacetic acid and
graphite layers are formed. Electrochemical reduction of the stage-1
GIC leads to the deintercalation of ionically bonded intercalate,
yielding the stage-2 covalent GIC. The interlayer spacing is 8.10
Å for stage-1 and 11.62 Å for stage-2 GIC. Further electrochemical
oxidation of stage-1 CF3COOH-GIC does not lead to the exfoliation
of the GIC product, and the GIC has relatively high stability in air.