Abstract
The intercalation reaction of sulfuric acid into graphite was surveyed by measuring the potential of the host graphite. The potential of host graphite during the intercalation of sulfuric acid by chemical oxidation was found to increase to positive direction in stepwise, corresponding to the formation of each stage structure of intercalation compounds, and to be saturated at a certain value. The threshold potential for the stage transformation in H 2SO 4_GICs remarkably increases with dilution of sulfuric acid, and the upper limit of saturated potential by the addition of excess amount of oxidizer remarkably decreases with dilution of sulfuric acid. It is the relation between these two potentials that governs the intercalation of sulfuric acid into graphite in various sulfuric acid solutions.
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