Figure 3.
Characterization of Reactive Oxygen Species
(A) Band structure of CN, CNCY, and CN-T.
(B) In situ EPR spectra. Room-temperature EPR spectra were measured after in situ illumination for 5 min by using DMPO as trap agent.
(C–E) Insitu FTIR spectra of CN-T with the addition of O2 or dual addition of O2 and styrene to observe the formation of ROS (peroxy species) and the reaction pathway on the catalyst surface. The FTIR spectra were obtained in a sealed in situ reaction cell and the dosages of the styrene and oxygen were 20 μL and 5 mL (1 atm), respectively.
(F) Dioxygen adsorption mode on cyano-modified sample, located above (i) N7-C17 or (ii) N7-N18.