During performing CV of a GCE or modified GCE, we rise the potential in the first half of the cycle and reduce it in reverse half. During the first half, what is the nature of charge on GCE or modified GCE, similarly what is the charge during reverse cycle.

For, Eg- In Fe redox couple, for a graphene coated GCE, Ox. of Fe2+ is seen at 0.25V whereas in bare GCE, Ox. is seen at 0.3V. How does the charge on GCE plays a critical role here? Please explain.

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