Fig. 2
From: Substrate engineering of graphene reactivity: towards high-performance graphene-based catalysts
Four possible adsorption configurations of graphene@Ru (0001): a fcc-top, b hcp-top, c fcc-hcp, and d intermediate. Color Scheme: Carbon in black and Ru in gray. Isosurface of charge redistribution is also shown: Blue (brown) represents electron accumulation (depletion). Insets: Side views of adsorption configurations. The charge redistribution is defined as \({\mathrm{\delta \rho = \rho }}_{{\mathrm{{\rm G}}@{\mathrm{Ru}}}} - ({\mathrm{\rho }}_{\mathrm{{\rm G}}}{\mathrm{ + \rho }}_{{\mathrm{{\rm Ru}}}})\). Note that there is no visible charge redistribution in c, indicating the weak interaction between graphene and Ru surface in this case
