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Cyclic voltammogram showing the reversible redox couple of HPAz. The potential was obtained at scan rate of 0.1 V/s at pH 5.0 in 50 mM ammonium acetate buffer (black line). The signal with the capacitive current subtracted is shown as an inset in the middle (red line). (Em = 0.97 ± 0.02 V vs. SHE).
