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nO2 at several potential values (a); ORR Tafel plots (b); chronoamperograms in O2-saturated KOH electrolyte at 1600 rpm and E = 0.50 V vs. reversible hydrogen electrode (RHE), with the addition of methanol (0.5 mol dm−3) at t = 500 s (c) and without for 20000 s (d).
