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. 2024 Jan 30;121(6):e2318174121. doi: 10.1073/pnas.2318174121

Fig. 3.

Fig. 3.

ORR performance. Alkaline condition (0.1 M KOH): (A) ORR LSV curves in O2-saturated 0.1 M KOH solution at a scan rate of 10 mV s−1 and a rotation rate of 1,600 rpm. (B) The corresponding Tafel plots. (C) Half-wave potential E1/2 and kinetic current density Jk for different catalysts. (D) Steady-state ORR polarization curves recorded in O2-saturated 0.1 M KOH with or without poisoning by 0.01 M SCN− at a scan rate of 10 mV s−1 and a rotation rate of 1,600 rpm. (E) CA test of the catalysts at 0.6 V (vs. RHE) and a rotation rate of 1,600 rpm in O2-saturated 0.1 M KOH solution. (F) Methanol tolerance test at 0.85 V (vs. RHE) and a rotation rate of 1,600 rpm in O2-saturated 0.1 M KOH solution containing 5 wt.% methanol; acidic condition (0.5 M H2SO4): (G) ORR LSV curves in O2-saturated 0.5 M H2SO4 solution at a scan rate of 10 mV s−1 and a rotation rate of 1,600 rpm. (H) The corresponding Tafel plots. (I) CA test of the catalysts at 0.6 V (vs. RHE) and a rotation rate of 1,600 rpm in O2-saturated 0.5 M H2SO4 solution.