Fig. 2. TEM and FFT images of (A) Py-COF, (B) Tet-COF and (C) Tpe-COF. (D) FT-IR spectra of Py-COF and Py-hCOF. (E) The N 1s XPS spectra of Py-hCOF and Py-COF. (F) Nitrogen adsorption and desorption isotherms of Py-COF. Insets: pore size distributions calculated. UV-Vis DRS spectra of COFs (G) before and (H) after AC treatment. (I) Tauc plots of the Py-COF, inset Tauc plots of the Py-hCOF.
