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A) CV curves of the hybrid Pt/rGO paper electrode and a Pt foil electrode in 1 m H2SO4. Scan rate: 100 mV s−1. The inset shows impedance plots of rGO and hybrid Pt/rGO paper electrodes in 0.1 m KCl containing 1.0 mm K3Fe(CN)6 and 1.0 mm K4Fe(CN)6. B) DPV curves of the hybrid electrode in blank bath solution and bath solution containing 0.15 mm AA, 0.003 mm DA, and 0.15 mm UA, showing the feasibility of selective detection.
