Fig. 4: ORR catalytic performance.
a iR corrected LSV curves in 0.1 M KOH (pH = 13 ± 0.10), b Tafel plots, JK and E1/2 for the CA-Fe@BC-ng, Fe@BC, CA-BC, BC, and commercial Pt/C catalysts at a rotating rate of 1600 rpm in O2-saturated alkaline medium, c kinetic-limiting current densities of ORR over the CA-Fe@BC catalyst at different rotating speeds, inset curves are K-L plots at various potentials, d iR corrected LSV curves recorded before and after 10,000 CV cycles, e amperometric i-t curves at applied potential of 0.5 V in alkaline medium, inset curves are the i-t responses at 0.5 V and 1600 rpm by adding 1.0 M methanol at around 200 s, f comparison \({\triangle}\)E1/2 (E1/2-catalyst - E1/2-Pt/C) of the CA-Fe@BC-ng catalyst. g iR corrected LSV curves in 0.5 M H2SO4 (pH = 1 ± 0.06), h Tafel plots, JK and E1/2 for the CA-Fe@BC, Fe@BC, CA-BC, BC, and commercial Pt/C catalysts at a rotating rate of 1600 rpm in O2-saturated acidic medium, i kinetic-limiting current densities of ORR on the CA-Fe@BC catalyst at different rotating speeds, inset curves are K-L plots at various potentials. j iR corrected LSV curves in O2 -saturated in 0.1 M PBS (pH = 7.2 ± 0.12) at 50 mV s−1, k Tafel plots, JK and E1/2 for the CA-Fe@BC, Fe@BC, CA-BC, and commercial Pt/C catalysts at a rotating rate of 1600 rpm in O2-saturated neutral medium, l kinetic-limiting current densities of ORR over the CA-Fe@BC catalyst at different rotating speeds, inset curves are K-L plots at various potentials. The error bars represent the standard deviation, which were obtained from four independent samples and at least three independent measurements for each sample. iR correction was conducted at 100% automatically. Source data for (a–l) are provided as a Source Data file.
