For the transfer of an electron from doubly negatively charged graphene to Me-Vi +2 , all the Marcus parameters are computed as shown in Fig. . We compare an explicit water solvent model with an combined explicit-implicit solvent model. A slightly larger wavefunction overlap between two interacting states results in a greater electronic coupling (H 0 ij ) in the explicit-implicit solvation model. The coupling remains, however, almost independent of the number of waters. It is clear that, during ET, chemical bonds relax and solvents reorient.