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(A) Cyclic voltammograms of 10 μM Trp in 0.05 M H2SO4 solution obtained on the Cu2O–ERGO/GCE at different scan rates (a–j: 30, 60, 90, 120, 150, 180, 210, 240, 270, and 300 mV·s−1). (B) A plot of the peak current versus scan rate; (C) a plot of the peak potential versus the Napierian logarithm of scan rate.
