Fig. 9From: Defect and Doping Engineered Penta-graphene for Catalysis of Hydrogen Evolution ReactionSchematic pathways for the HER. Energy profiles for the Tafel and Heyrovsky reactions with a C2-UP vacancy and S-doped PG, b C2-DOWN vacancy and S-doped PG, c C2-UP vacancy and P-doped PG, d C2-DOWN vacancy and P-doped PG. The initial state (IS), the transition state (TS) and the final state (FS) are indicated in the diagram with the corresponding energy barriersBack to article page