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The evidence of a chemical reaction coupled to the electrochemical process was
obtained by cyclic voltammetry at different scan rates (Fig. 3b). The relative current magnitude of the cathodic signal in comparison to the oxidation signal, associated to the first oxidation process, is much higher with the increase of the scan rate, as it is shown in Fig. 3b. The inset in Fig. 3a shows a differential pulse voltammetry associates to the first oxidation signal. It can be seen in this figure that the width at the half height of the peak is approximately 90 mV. It is evidence that the first oxidation step of piperonyl alcohol is linked to an one-electron transfer reaction.
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