Fig. 6From: Insights into the H2/CH4 Separation Through Two-Dimensional Graphene Channels: Influence of Edge FunctionalizationElectron density isosurface of the entrances of a GM, (b) GM–H, (c) GM–F, (d) GM–OH, (e) GM–NH2, and (f) GM–COOH (isovalue of 20 e nm−3)Back to article page