V and -4.5 V, having a minuscule shift of 0.32 eV and 0.25 eV. For graphitic N, a shift of 0.09 eV and 0.04 eV is observed, confirming the presence of g-C3N4 QDs. An additional peak is noted at 398.26 eV, resulting in the C-N-C interaction at -4.5 V. The high-resolution C 1s In Figure ), three excitation wavelengths at 299, 293, and 298 nm are due to three different sizes synthesized at -1.5, -3, and -4.5 V, respectively. These wavelengths correspond due to π-π* transitions of C=C and C=N bonds of the sp 2 carbon domain in the carbon nitrides containing tri-s-triazine ring. PL is an ingenious technique for optical characterization. Figure ) shows a dual emission at 412 and 431 nm corresponding to the excitation wavelength 370 nm (for size 2.5 nm). The duality observed here is due to the small fluorescent molecule formed on the surface of the QDs as a side product from the electrochemical exfoliation of melamine in IL. The excitation-independent peaks revealed the transition between the valence band and the lone pair state of the intra-tri-s-triazine nitrogen. From Figures ) and (f), an emission wavelength at 502 and 510 nm corresponds to its excitation wavelength at 420 nm (for size 4.1 nm) and 420 nm (for size 8.7 nm), respectively. Here, the excitation-dependent wavelength for violet g-C3N4 QD, -74 mV for blue g-C3N4 QD, and -94 mV for green g-CN QD. Figure b) shows the synthesized GCN at various scan rates. To investigate the influence of KOH 4 concentration, we performed cyclic voltammograms (SI; Figure (a) and (b)) with 2.5 nm 5 carbon nitride quantum dots in 0.5 M (pH 13.59) and 0.1 M (pH 11.95) KOH. Furthermore, 6 product confirmation is carried out in the presence and absence of TEMPO during the ongoing 7 cyclic voltammetry to capture the required intermediates (SI; Figure ) and (e)). To 8 perceive the morphological impact of g-C3N4 on ORR kinetics, Tafel slopes are compared for 9 all the sizes, as depicted in Figure ). Green g-C3N4 QDs exhibited a notably smaller Tafel 10 slope of 29 mV dec -1 compared to violet and blue g-C3N4, having 36 and 35 mV dec respectively, underscoring the advantageous role of g-C3N4 QDs in enhancing ORR kinetics.