Figure 8

CV illustrating the effect of variable scan rates (0.01–0.1 Vs⁻¹) on (a) 500 µM catechol and (b) 500 µM hydroquinone in 0.1 M PBS at CNCs/Zn-TPP/GCE electrode; Insets: Calibration plot of I_p(a,c) vs. square root of scan rate (ʋ^1/2) for CC and HQ.