Fig. 3: PBE convex hull diagram.
From: Prediction of highly stable 2D carbon allotropes based on azulenoid kekulene
a Azulenoid kekulene carbons (AKC), porous azulenoid kekulenes (PAK), and porous graphenes (PG) on the PBE convex hull diagram for hydrocarbons CxH1−x defined by the hydrogen molecular crystals, solid methane, and hexagonal graphite. b Magnified region of the convex hull diagram showing AKC and PAK materials. The dashed lines show the constant energy levels above the convex hull. Polyphenylene network is a 2D porous graphene that has been synthesized on metal surfaces33.
