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Cyclic voltammograms of the Ppy-copper nanocomposite modified Au electrode in the presence of different H2O2 concentration in the solution of 0.1 mol L-1 NaOH at 100 mV s-1, (a) 0 mol L-1, (b) 3.5×10-5 mol L-1, (c) 4.9×10-4 mol L-1 and (d)1.19×10-3 mol L-1.
