Extended Data Fig. 5: Atomic charge distribution of ZnTPP-COF (a), NiTPP-COF (b) and CuTPP-COF (c) from DFT calculation.
From: Advancing osmotic power generation by covalent organic framework monolayer
The metal centers show positive charge intensity in the order of ZnTPP-COF > NiTPP-COF > CuTPP-COF, which is consistent with the experimental trend on the positive surface charge density of these membranes. (orange: Zn, teal: Ni, green: Cu, blue: N, red: O, grey: C, white: H).
