Fig. 5: Electron transportation investigation of the photocatalysts.

a Photocurrent measurement curves in 0.1 M Na2SO4 solution under Ar gas bubbling. b Photocurrent measurement curves in 0.1 M Na2SO4 solution under O2 gas bubbling. c Illustration of the electron transfer mechanism in PYR-2D and TPL-2D with the two-dimensional structure under O2 atmosphere. d Illustration of the electron transfer mechanism in TPC-3D with the self-supporting three-dimensional structure under O2 atmosphere.