Figure 10.

(A) Proposed doping model of graphene: (a) quaternary N (B, P, and S)-doped graphene (model a), (b–d) single-vacancy graphene with the single pyridine N (B, P, and S) doping (model b), double N (B, P, and S) doping (model c), and triple N (B, P, and S) doping (model d), and (e–g) single-vacancy graphene with NNS(P) co-doping (model e), NSS(P) co-doping (model f), and NS(P) co-doping (model g). (B) corresponding C_Q of doped graphene. These panels were adapted with permission from ref (58). Copyright 2019 American Chemical Society. (C) Plot of the maximum quantum capacitance of co-doped graphene. This panel was reproduced with permission from ref (62). Copyright 2019 Springer Nature.