Fig. 5. DFT calculations and proposed schematic mechanism of TpBpy-NS.
a UV–Vis absorption spectra of TpBpy-NS compared with TD-DFT calculated fragment. b The TD-DFT calculated electronic transition of TpBpy-NS. c The possible process of HER on Tp segment and OER via dual-site process on Bpy segment in TpBpy-NS. d The comparison of calculated Gibbs free energy change for C2d paths of OER for TpBD-NS, TpBpy-2-NS and TpBpy-NS at pH = 7.