Fig. 12. Electrocatalytic current mapping through AFM-SECM on Pt NPs with an Au-c-Pt tip: (a) topography; (b and c) Z-profiles of the NPs marked ‘1’ and ‘2’ respectively; (d) ORR currents and (e) H2O2 currents of the same NPs in O2-saturated 0.1 M HClO4. Esubstrate = 0.70 V vs. the standard hydrogen electrode (SHE), Etip = 0.98 V vs. SHE. Tip size, ∼100 nm. Active pixel distribution of the (f) ORR and (g) H2O2 of Pt NPs marked as ‘1’ in black, ‘2’ in red and ‘3’ in blue. Reproduced from ref. 146 with permission from John Wiley and Sons © 2019.
