Differential pulse voltammetry symmetric peaks

The potential wave-form for differential pulse voltammetry (DPV) is shown in Figure 2.8. The perturbation consists of a series of pulses having constant amplitude, superimposed at the same time upon a staircase wave-form. In contrast with NPV, the current is sampled twice at each pulse period (at the beginning and at the end of the pulse). The difference between these two current values is recorded and displayed as function of the applied potential, E, as shown in Figure 2.9, where it is observed that the current function response is characterized by symmetric peaks [4,8]. 

---