| Eb-TMx+ (eV) | Eads-HCOOH (eV) | C2N→TMx+ charge (e−) | HCOOH→C2N-TMx+ charge (e−) |
C2N-Co2+ | 15.16 | 0.83 | −1.11 | −0.07 |
C2N-Cu2+ | 16.14 | 0.48 | −1.12 | −0.02 |
C2N-Ni2+ | 14.64 | 1.15 | −1.08 | 0.01 |