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Linear sweep voltammetry (LSV) (A); differential pulse voltammetry (DPV) (B); and second-order derivative linear sweep voltammetry (C) of 0.1 M HCl (curve a) 0.1 M HCl containing 5.0 μM 4-NP (curve b) recorded on GR/ABPE after accumulated at 0.0 V for 60 s. Scan rate: 0.1 V s−1.
