Fig. 8. (a) CV curve of LS–rGO/GCE in 0.1 M PBS (pH = 7.0) containing 0.2 mM UA, 0.1 mM DA at a scan rate of 100 mV s⁻¹. (b) CV curve of LS–rGO/GCE in 0.1 M PBS (pH = 7.0) containing 0.2 mM AA, 0.1 mM DA at a scan rate of 100 mV s⁻¹. (c) Schematic representation of electrocatalysis of DA, AA, and UA at LS–rGO/GCE.