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Destructive effect of peroxide treatment represented by ORR RRDE curves of the PVAG-Fe catalyst in 0.1 M HClO4 (a) and in 0.1 M KOH (b), initially (—) and after destructive treatment (- - -). Scan rate: 20 mV/s. Loading of FeNC catalysts: 0.6 mg/cm2 on 5.61 mm glassy carbon ring disk electrode. (c) FT EXAFS Fe-edge spectra of PVAG-Fe catalyst before (black) and after (blue) the treatment.
