Abstract

Air-stable graphite compounds with perfluorooctanesulfonate, CxC8F17SO3, are prepared by electrochemical oxidation of HOPG chips or SP-1 graphite powder in LiC8F17SO3 (saturated)/CH3NO2 electrolyte. XRD patterns of several single-stage products indicate that highly ordered intercalation compounds form with di = 24.6−24.9 A for stages (n) = 3−7 or 26.6 A for n = 2, supporting the model of a bilayer of perfluoroalkylsulfonate anions within the intercalated galleries. Gravimetric and thermogravimetric data provide x for n = 2−6. Consistent with the bilayer model, the C/anion ratio is found to be much lower than in small-anion intercalation compounds. Ambient temperature exfoliation occurs when a high-stage graphite sulfate is anodized in the C8F17SO3--containing electrolyte.

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