Fig. 8. (A) Cyclic voltammograms of the Aux/glassy carbon (GC) electrodes (x = 11, 25, 55 and 140) saturated with O2 and of the Au11/GC electrode saturated with N2 (thin solid curve). (B) Current density and overpotential of ORR activity with each size of Au NCs calculated from (A). (C) Rotating-disk voltammograms recorded for ORR activity by Au36(TBBT)24 NCs/GC electrode at different rotation rates. (D) Reaction rate constant ln(k) vs. overpotential E plots with each size of Au NCs calculated from (C). (E) Rotating-ring-disk voltammograms with 1600 rpm rotation rate. (F) Percentage (or selectivity) of H2O2 using with Au25−, Au250, and Au25+ NCs. Panels (a) and (b) are reproduced with permission from ref. 49. Copyright 2009 Wiley-VCH. Panels (c) and (d) are reproduced with permission from ref. 51. Copyright 2018 American Chemical Society. Panel (e) is reproduced with permission from ref. 54. Copyright 2014 Royal Society of Chemistry. Panel (f) is reproduced with permission from ref. 53. Copyright 2014 Royal Society of Chemistry.
