Figure 5.
(a) Current-time (i–t) chronoamperometric response of the pristine graphite, XGnPs, and commercial Pt/C electrodes at −0.25 V vs. Ag/AgCl in O2-saturated 0.1 M aq. KOH solution at a rotation rate of 1600 rpm. Note that the blue and green curves are almost overlapped with each other. (b) The current-time (j–t) chronoamperometric responses for ORR at the pristine graphite, XGnPs, and commercial Pt/C electrocatalysts in an O2-saturated 0.1 M aq. KOH solution at −0.40 V vs. Ag/AgCl and 3.0 M methanol or carbon monoxide (CO, 10 ppm/min) were added at around 360 s.