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Reaction of Graphite with Sulfuric Acid in the Presence of KMnO4

“…As seen, the DSC pattern is similar to the above pattern for graphite bisulfate, implying that the enthalpy is mostly contributed by boiling and decomposition of sulfuric acid on the surface of the graphite sample. This is a probable reason why in our case, unlike what is observed in [7], the decomposition onset temperature of graphite bisulfate does not increase with increasing stage number.…”

“…Moreover, the decomposition onset temperature is almost independent on the stage number of the starting GIC, while Matzui et al [7] reported the tendency of the decomposition onset temperature to increase with increasing stage number. The similar DSC curves and almost equal specific decomposition enthalpies of graphite bisulfate suggest that processes associated with H 2 SO 4 deintercalation from the graphite matrix contribute little compared with another, more energetic process.…”