Figure 3

CV responses of GCE/GO@MB (A) and GCE/GO@MB-Ab2-HRP (B) at different scan rates (5–500 mV s⁻¹) in pH7 phosphate buffer solution. Plots of (C) anodic (i_pa) and cathodic (i_pc) peak currents vs scan rate and (D) anodic (E_pa) and cathodic (E_pc) peak potentials vs log (scan rate) for the GCE/GO@MB (A1/C1) and GCE/GO@MB-Ab2-HRP (A2/C2). CV response of (E) GCE/GO@MB-Ab2-HRP in 500 μM H₂O₂ dissolved pH 7 PBS at different scan rate (5–500 mV s⁻¹) and (F) Plot of i_pc of H₂O₂ vs square of scan rate for the GCE/GO@MB-Ab2-HRP.