The working electrode oxidizes throughout the forward cycles, and the potential goes from negative to positive (shown in Fig 1) at a certain voltage which is called anodic peak voltage (EPA).
When the reverse cycle occurs, the reduction requires a significant current, resulting in a downward peak that indicates the current decreases from positive to negative potential (shown in Fig 1) at a certain voltage known as the cathodic peak voltage (EPC). These are the reasons for the duck shape in Cyclic Voltammetry.
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