fig11

Figure 11. (A) XAS spectra for the L₃ and L₂ edges of Mn-PHI photocatalyst; (B) Operando XAS spectra at the Mn L_3,2-edges of Mn-PHI under various conditions; (C) Intensity of high-energy peaks at the Mn L₃-edges under various conditions, with yellow boxes marking the illumination periods during the photocatalytic reaction; (D) Proposed photocatalytic mechanism for the formation of hydrogen peroxide and high-valent metal species; (E) Mechanism for the generation of metal-oxo species via photogenerated holes and H₂O₂; (F) Photocatalytic mechanism for the oxidation of toluene into benzaldehyde through benzyl alcohol, catalyzed by iron- and manganese-oxo species. Reproduced with permission, Copyright 2023, Wiley-VCH^[151]. XAS: X-ray absorption spectroscopy; PHI: poly(heptazine imides).