fig13
Figure 13. (A) Schematic comparing the PGM-free catalyst in the ORR process without and with the radical scavengers. (B) Stern-Volmer plot obtained using 6CFL dye in the radical solution with Fenton’s reagent, Fenton’s reagent with Fe-N-C, and Fenton’s reagent with Ta-TiOx/KB. (C) Electron paramagnetic resonance spectra of the OH-DMPO. (D) ORR performance of Fe-N-C catalysts with or without the TaTiOx-/KB radical scavengers. These figures are quoted with permission from Xie et al.[78].
