It is well-established that the electronic structure of graphene and in particular the finite number of density of states (DOS) close to the Fermi level, gives rise to a voltage drop associated with the rate of change of the occupancy of the band edges in the electrode. The latter introduces a potential drop that is different from the Galvani potential leading to an additional term to the EDL capacitive contribution added in series with the latter, typically referred to as the quantum capacitance ( 69 . On this basis, the total capacitance, , of the system is expressed as the series contributions of and the EDL capacitance ( ), as follows: