Fig. 6
Density functional theory calculation of graphene-coated nickel foam. a–f Redistribution of the electron densities of single-layer graphene in the Model I (a) and each graphene layer from the first to the fifth layer (b–f) in the Model II. g, h Redistribution of the electron densities in the cross section (IDL formation) of Model I (g) and Model II (h). The differential charge density is defined as the difference in the electron density with and without the nickel substrate. The red and blue regions are regions of increased and decreased electron density, respectively (the gradient ruler represents electron density, e/Å3)
