The accelerated reaction kinetics observed in g-C3N4 QDs, contributing to its enhanced ORR 13 activity, can be attributed to the effective exposure of surface active sites. In Figure (d), the 14 Koutecky-Levich plot provides the number of electrons engaged in the oxygen reduction 15 process, offering a possible mechanistic shift with size. Moreover, the kinetic limiting current 16 density from the intercepts of the Koutecky-Levich plots also shows an interesting variation, 17 and these, along with the number of electrons transferred (n) and diffusion coefficient, are 18 compared in Table